Hybrid Beamforming Design for 5G Wireless Communications

Hybrid Beamforming Design for 5G Wireless Communications To comply with evolving 5G standards, higher data rates (and greater bandwidth), lower-latency network accesses, and more energy-efficient implementations are needed. While 5G standards are still very much evolving, the goals for higher data rates, lower-latency network accesses, and more energy-efficient implementations are clear. And with higher data rates comes the need for wider bandwidth spectrums. Today, available bandwidth in the spectrum up through 6 GHz isnt sufficient to satisfy these requirements. This, in turn, has helped move the target operating frequency bands up into the millimeter-wave range for the next generation of wireless communication systems. The small wavelengths at these higher frequency bands enable implementations with many more antenna elements per system within very small form factors. However, it also increases the signal-path and propagation challenges associated with operating at these frequencies. For example, the path loss for a 60-GHz waveform is approximately 10.5 dB/km, while a 700-MHz waveform experiences path loss on the order of 0.01 dB/km. These losses can be offset with intelligent array design and the use of spatial signal-processing techniques, including beamforming. This type of processing is enabled by large arrays and can be used directly to provide higher link-level gains to overcome path loss and undesirable interference sources. To achieve the most control and flexibility with beamforming in an active array design, its desirable to have independent weighting control over each antenna-array element. This requires a transmit/receive (T/R) module dedicated to each element. For array sizes typical of a large multiple-input, multiple-output (MIMO) communication system (e.g., over a thousand elements), such an architecture is difficult to build due to cost, space, and power limitations. For example, implementing a very high performance analog-to-digital converter (ADC) and digital-to-analog converter (DAC) for every channel (along with the supporting components) can drive the cost and power beyond allocated design budgets. Similarly, having variable gain amplifiers in the RF chain for each channel increases system cost. Going Hybrid Hybrid beamforming is a popular technique that can be used to partition beamforming between the digital and RF domains. System designers can implement hybrid beamforming to balance flexibility and cost tradeoffs while still fielding a system that meets the required performance parameters. Hybrid-beamforming designs are developed by combining multiple array elements into subarray modules. A T/R module can be dedicated to multiple elements in the array; thus, the system will require fewer T/R modules. The number of elements in each subarray can be selected to ensure that system-level performance is met across the range of steering angles. Using the transmit path as an example, each element within a subarray can have a phase shift applied directly in the RF domain, while digital beamforming techniques based on complex weighting vectors can be applied on the signals that feed each subarray. Digital beamforming allows for control of the signal for both amplitude and phase on signals aggregated at the subarray level. For cost and complexity reasons, the RF control is typically limited to applying phase shifts to each of the elements. Diagram here, Figure 1 Figure 1. A hybrid-beamforming architecture has partitioning between the digital and RF domains. Multiple array elements are combined into subarray modules. Each element within a subarray has a phase shift applied directly in the RF domain, while digital beamforming techniques are applied on the signals that feed each subarray. Systems such as the one shown in Figure 1 are complex to develop. Modeling techniques can be used to design and evaluate large antenna arrays and the corresponding RF and digital architectures needed to help manage their complexity. These techniques help reduce risk and validate design approaches at the earliest stages of a project. In addition, its important to evaluate subsystem designs in the context of the larger system. For example, how will hybrid beamforming tradeoffs affect the bit error rate on communications with a mobile device? Designing the Array The first step in the design process is to model and design the array. This includes converging on array design choices such as the array geometry, element spacing, the lattice structure of the elements, and tapering. In addition, the effects of mutual coupling are important to characterize before implementing the final design. Once an initial configuration of the array design is complete, architectural partitioning can be iteratively evaluated against the overall system performance. With millimeter-wave systems, the area is reduced in proportion to the wavelength size. As an example, an antenna array designed at millimeter-wave frequencies can be up to 100 times smaller than an array designed to operate at microwave frequencies. By building an array with a larger number of antenna elements, we can achieve a high beamforming gain. The highly directive beam helps offset the increased path loss at higher frequencies of operation, as beams are steered to a specific direction. To achieve steering in azimuth and elevation, a uniformly spaced planar array in the y and z plane can be designed. The larger number of elements provides a high level of directivity. The design also has tapering applied to the rows and columns of the array to reduce sidelobe levels. To help reduce the effects of mutual coupling, the spacing between elements can be slightly increased. As is the case with all design choices, the larger antenna gains achieved with narrower beams must be balanced with the fact that MIMO systems are based on scattering environments. These environments also depend on broader beam patterns to maximize channel capacity. This tradeoff can be assessed as part of the modeling, too. The image on the right side of Figure 2 shows that with spacing of wavelength/2 between the elements, no grating lobes are present across the full range of steering directions, as expected. Its important to understand the impacts here, because it may be necessary to increase the spacing between the elements to mitigate the effects of mutual coupling. This crucial design consideration must be accounted for at this juncture. Fortunately, at the higher frequencies, where wavelength/2 spacing is quite small to start with, an increase in element separation by 10% of a wavelength only requires a change of less than 0.5 mm at 66 GHz. Figure 3 shows the tradeoff that must be considered when using a grating lobe diagram with a 10% increase in the spacing between the elements. For this example, grating lobes are only present with azimuth and elevation angles outside  ±54.9 degrees. Extending the Model Fidelity Next, in a more detailed example, an array is built up as a collection of subarrays. The element used in this example, which is based on a patch antenna designed for 66-GHz resonance, is no longer ideal. The element pattern for a single patch element is shown in Figure 4. To build up an array using this pattern, each subarray is modeled as an 8-1 element uniform linear array, where each element has a pattern response from the patch element. The resulting array structure can be visualized like that shown in Figure 5, with each subarray (8 elements 1 subarray) on the left and the full array (1 subarray replicated in 8 columns) on the right. From the hybrid-beamforming perspective, each of the elements within the 8-1 array can be passed through a phase shifter for steering in the elevation plane. We see how this can be modeled in the RF domain with the phase shifters in the following section. Each of the eight signals that feed the subarrays can be controlled via digital beamforming techniques to steer the beam in azimuth. Figure 2 shows the resulting beam pattern for the array in the above configuration, which has been calculated using superposition. Hybrid-Beamformer Partitioning We can then partition the architecture for the transmit chain with the phase shifts (applied in the RF domain) and complex weights (applied in the digital domain). For basic analysis, the weights are able to be generated using MathWorks MATLAB, Phased Array System Toolbox, and Antenna Toolbox code, as shown in the code below: This MATLAB code is used to model analog phase shifts (applied in the RF domain) and digital complex weights (applied in the digital domain). Weights are generated with MATLAB, Phased Array System Toolbox, and Antenna Toolbox. Applying the array design parameters, the digital weights and the RF phase shifts generated in MATLAB earlier (a multi-domain simulation) can be performed using the architecture model in Simulink (Fig. 7). In this block diagram, the phase shifts are provided as inputs to each of the subarrays, which are then applied to the RF signals. The digital beamforming weights are used to shape the signals feeding each of the subarrays. 7. In the multi-domain hybrid architecture, digital weights and RF phase shifts generated in MATLAB can be used within the architectural model in Simulink and SimRF. The phase shifts are provided as inputs to each of the subarrays, which are then applied to the RF signals. The digital beamforming weights are used to shape the signals feeding the subarrays. Figure 8 provides a detailed view into a single RF Array block from Fig. 7. The RF phase shifters shown in Fig. 8 perform the beamforming in the elevation plane, while the baseband weights provide the beamforming in the azimuth plane. 8. Here, an RF transmit chain uses SimRF blocks to control phase shifters (a single RF Transmit Array block is shown). The RF phase shifters perform the beamforming in the elevation plane, while the baseband weights provide the beamforming in the azimuth plane. Multi-Beam Hybrid System Architectures The model can be extended to support multi-user beamforming systems. To do this, the baseband beamforming blocks described above are employed to create multiple beams from the array to cover multiple users concurrently (Fig. 9). This beamforming can also be used to account for the path variations between the transmitter and the desired user locations. The resulting signals are able to be combined to perform the RF beamforming and serve the different users in a sector at specific distances from the base station. As discussed earlier, the subarray modules enable coarse elevation angle adjustment (by phase shifters), and multi-user groups can be arranged by distance in a ring structure to effectively provide areas of coverage. 9. Base band beam forming blocks create multiple beams to cover multiple users concurrently, and can also be used to account for the path variations between the transmitter and the desired user locations. Summary By implementing a hybrid-beamforming system, designers can strike a balance between meeting system performance goals and system-level cost objectives. Developing a hybrid beamformer and evaluating algorithm alternatives is only the first step toward achieving the required performance of a wireless communications system. To assess performance, the beamformer must be integrated into a system-level model and evaluated over a collection of parameter, steering, and channel combinations. Modeling these beamforming algorithms in the context of an entire system, including RF, antenna, and signal-processing components, can help verify design choices at the earliest phases of the project and reduce the associated challenges. Singular Value Decomposition Singular value decomposition (SVD) is quite possibly the most widely-used multivariate statistical technique used in the atmospheric sciences. The technique was first introduced to meteorology in a 1956 paper by Edward Lorenz, in which he referred to the process as empirical orthogonal function (EOF) analysis. Today, it is also commonly known as principal-component analysis (PCA). All three names are still used, and refer to the same set of procedures within the Data Library. The purpose of singular value decomposition is to reduce a dataset containing a large number of values to a dataset containing significantly fewer values, but which still contains a large fraction of the variability present in the original data. Often in the atmospheric and geophysical sciences, data will exhibit large spatial correlations. SVD analysis results in a more compact representation of these correlations, especially with multivariate datasets and can provide insight into spatial and temporal variations exhibited in the fields of data being analyzed. There are a few caveats one should be aware of before computing the SVD of a set of data. First, the data must consist of anomalies. Secondly, the data should be de-trended. When trends in the data exist over time, the first structure often captures them. If the purpose of the analysis is to find spatial correlations independent of trends, the data should be de-trended before applying SVD analysis.

House of the Spirits, Major Motifs Essay -- English Literature

House of the Spirits, Major Motifs Politics Pedro Tercero brought Socialism to the peasants of Tres Marias, and got Jaime very interested in justice, equality, and the peasant movement. The peasants want their feelings to be heard and want a socialist style of government, but they are afraid that Esteban Trueba will find out and kick them out of the estate. The people of Tres Marias have no desire to vote because they know that the ballots are changed. Pedro Tercero tries to make the people understand that this election will be different; there will be people from the socialist party watching the ballot taking and the ballot boxes will be sealed. The people of Tres Marias are beginning to understand how their problems can be solved, and how people should really be living. Esteban Trueba however, is on the other side of the political wings he needs full control over the peasants so his estate will function, he believes that the peasants can’t rule themselves. If his people vote for a socialist government he can’t kick them out because then he’ll have to kick everyone out, he will do more harm to himself through anger. Power Men are losing power. Jean de Satigny is handsome and a French count from all around the world, unlike other men, he has experienced what the world has to offer. He is civilized and has lots of money to flaunt to his lover, but even though he has so much he can’t get Blanca to marry him. Someone with so much has no power over the women he wants. Esteban has no power over Clara when he needs it most, and when he wants complete control over her she can avoid him or hide from him. He tries to go back to raping peasants, but he can’t lift them up onto his saddle because his age. H... ...ut Esteban doesn’t understand the unexplainable attraction of love and sees it as bondage of two people from the same class. The love between Blanca and Pedro Tercero is the strongest love in the whole book. The devotion of the two to stay together through all the years is something close to magic. Starting out from playing in mud and sleeping naked under the dinner table on top of each other like two fitting puzzle pieces, perfect. Then through the years getting more and more serious until their love cannot be separated by Esteban’s skeptical morals. They start to sneak out at night to meet by the river where they embrace and make love ending in the same position from when they first met. The love between the two lovers is natural not between class, money, family, or looks, but between two people who found love and will never let anyone take it from them.

Culinary art Essay

1. Executive Summary This report is a discussion about a bad review posted by John Trevallin on The Morning Post after his disastrous dinner at the Abbey Restaurant. John had some serious expectation from The Abbey as is considered a premier restaurant with great location and world renowned chef Marcus Vesty who owns the restaurant. This report consists of firstly the immediate stakeholders, who are answerable for the bad review, secondly analyzing the issues that led to the bad review, thirdly suggestions and recommendations on how to tackle the issue so as to live up to the expectations of the owners and saving the Radicor Hotel Darling Harbour as the owners are planning to divert its interest from one of the hotels in this chain. Later in the report discussions on how to live up to the expectations of the loyal guests as well as how to attract new customers after this bad review is considered and finding possible solution to maintain the glory of Radicor as well as The Abbey. 2. Introduction The Radicor Hotel Darling Harbour Sydney is a premier hotel in the heart of the city. Darling Harbor is one the most visited place in Sydney and is the key area of which has a convention center, an exhibition center and many other tourist attractions such as shops cafes. The major attractions for tourists are the Sydney Aquarium and the Chinese Garden. According to the video the total number of visitors in darling harbor last year was 27.9 million out of which 3.8 million visitors is on transit and the remaining 24.6 million are from interstate or overseas. The location of the Radicor hotel attracts both business travelers as well as tourists. Considering the number of visitors it is comprehensible that competition between hotels, cafes and restaurant would be very high. Hotels have to go beyond excellence to attract customers as in such a location with so varied visitors it is a challenge to meet the expectations of everyone and maintaining the customer service level. The Radicor Ho tel takes pride in providing quality and excellence to its guests and stakeholders. Marcus Vesty the world renowned chef runs the Abbey restaurant located on the ground floor of the Radicor Hotel and is considered the leading restaurant in Sydney providing a fusion of flavors from east and west. Marcus leases the restaurant from the Radicor Hotel on a profit share basis. There are a number of issues that the Radicor Hotel is facing and to top that up John’s shocking feedback about The Abbey is now really a knock on the door for them. To make things worse the parent company Simcom Group is certain about selling off one of the Radicor chain Hotels as a result of global financial crisis and Radicor Darling Harbour is on the list. 3. List of Stakeholders The stakeholders that are concerned with this case are Marcus Vesty – the executive chef and owner of Abbey restaurant, Mr Loyd Chan – major shareholder of the Simcom , John Trevallin – The morning post reviewer, Tom Mc Laren – General Manager Radicor Hotel Darling Harbour, the devoted customer’s of Radicor and Abbey restaurant as well as the restaurant team members both front of house and kitchen. 4. Analysis and Recommendation The key issues that need some highlight in this case can be categorized in terms of front of house and kitchen that are not living up to the expectation of customers and shareholders. Firstly we will discuss about the problems in the kitchen which lead to such a bad review. 4.1 Absence of Marcus: One of the major reasons to this is the absence of Marcus in his own restaurant. He being involved too much in doing TV shows, promoting his cookbook and other media appearances is undoubtedly affecting the quality of food served in the restaurant. Marcus coming to the restaurant once or twice fortnightly is not acceptable. Marcus needs to be more involved in the restaurant. He is required to sit with the General Manager, Maitre-d hotel, and sommelier to discuss about the issue and find effective ways to get the reputation of the hotel and the restaurant to its glory. He needs to have a through training session where he is required to clearly convey the target they desire to achieve. Being the executive chef he needs to motivate his employees by providing training, recognition, and bonus(Carroll, 2012). 4.2 Menu planning: Menu planning is a process of creating a menu that suits both management as well as customers taking into account all the characteristic of food service system. Menu in a restaurant for a guest is not just the list of available food but it’s an representation of the procedure and contributes to the overall dining experience by creating a mood and excitement about the experience(Gordon-Davis and Van Rensburg, 2004). The balance between all the food items on the menu is very important so that each course or dish suits the palate(Mc Vety et al., 2008). In the case study as highlighted by John that the some of the dishes were too fragrant and some have an odd after taste. This shows that the menu was not properly balanced and the composition of menu was not up to the mark. 4.3 Standards Recipe not followed: Though Marcus is a very renowned chef and is known for its amazing cooking there could be various other reasons why the food was not up to the mark such as it could be the chefs employed by Marcus that are not doing their job properly. Standard recipe for each dish not being followed by the chefs. So the chefs need to follow the standardrecipe and every time a particular dish comes should be the same. This leads us to the next problem which is lack of staff training. 4.4 Lack of training: It’s clear from the review that there is a lack of training in the kitchen. It’s surveyed that the most important issue the hospitality industry is facing is the training of staffs. Employee training is a vital necessity to generate quality experience for both staffs as well as guests as well trained employees are more likely to deliver high quality service(Kusluvan, 2003). As per the review the food provided was not up to the standards that should be in such a premier restaurant. Clearly the chefs at the Abbey need more training on how to follow the standard recipe and maintaining the consistency. This will eradicate the problem of food being not up to the mark and as a result avoid the negative reviews from guests about food. This will rather help for both the restaurant as well as Marcus to get back the reputation and glory back. Also catering to the guest requirement as much as possible can be taken into consideration to go that extra mile and meet the guest expectation. 4.5 Uniformity of staff: According to the video the front of house staff is employed by the Radicor Hotel except the chefs, sous chef, maitre-d hotel and sommelier which are employed by Marcus himself. This leads to deficiency of control of operational aspects such as training, staff selection, and lack of dedication among staff(Mull et al., 2009). Since Marcus does not have much authority to choose the front of house staff for his restaurant he cannot do much about training and selecting his employees. Since the front of house staff are a part of Radicor Hotel they lack dedication towards the restaurant and don’t take much effort in doing things right. 4.6 Lack of Menu Knowledge: The front of house staff according to the review has very less knowledge about the food. This again is a serious issue of lack of training and dedication of the staff. The knowledge about the menu is a ver y important aspect of a food and beverage staff as they are the ones who are actually dealing with guests and are in direct contact with them. It is expected from every food and beverage staff to know the menu and also about the food (Swanson and Toledo, 2008). The above issues may not be that big when we talk about restaurant failing as a whole but in terms of a fine dining restaurant with such a goodwill these things do matter a lot. As said earlier as well the expectations of guest become so high that it isdifficult to meet them unless each and every detail is looked after. This issue can be easily solved by training the staff; the best way to train the front of house staff about the menu is to have session with chefs. Conducting tasting sessions for staffs and asking them to comment is a very effective way of gaining knowledge about the food (Andrews, 1980). 4.7 Poor ambience of the restaurant: Though the restaurant is located in the famous hotel Radicor Darling Harbour which is in the heart of the city, the ambience inside the restaurant according to John is not like a fine dining restaurant should be. The reasons of this could be overbooking(Gagnon and Gagnon, 2011), location in terms of where the restaurant is in the hotel as well as its in the busiest area of Sydney. In a fine dining restaurant overbooking the location could lead to some very unhappy customers as they expect a quite place so that they can e njoy the experience of high quality service and food and can relax while dining. In fine dining restaurants only that number of booking should be taken which suits the ambience and may be the restaurant could be made partially soundproof so that outside noise does not bother the guests(Baraban and Durocher, 2010). Conclusion The Radicor Hotel Darling Harbour being a reputed hotel with a world class restaurant needs to focus on maintaining their reputation. It’s not only the restaurant that has received a bad review but the hotel as a whole has a lot of loopholes that needs some serious and immediate action so as to stay in the hunt in such a location. The review by John Trevallin is just a mere wake up call for the hotel and the restaurant as the customer satisfaction track record clearly states the failure to meet the targets and shows the downfall of the hotel. The General Manager of Radicor Tom Mc Laren and executive chef Marcus Vesty with the other managers of the hotel needs to start from the scratch and analyse each and every issue and take necessary steps in getting the lost glory back in track and ensuring Mr Lyod Chan that Radicor still has the potential to be the best in the market which as a result will save the hotel from getting sold off. References I. ANDREWS, S. 1980. Food and Beverage Service Manual, McGraw-Hill Education (India) Pvt Limited. II. BARABAN, R. S. & DUROCHER, J. F. 2010. Successful Restaurant Design, John Wiley & Sons. III. CARROLL, C. 2012. Leadership Lessons From a Chef: Finding Time to Be Great, Wiley. IV. GAGNON, R. & GAGNON, E. 2011. Appetite for Acquisition: The We Sell Restaurants Guide to Buying a Restaurant, Tate Pub & Enterprises Llc. V. GORDON-DAVIS, L. & VAN RENSBURG, L. 2004. The Hospitality Industry Handbook on Nutrition and Menu Planning, Juta. VI. KUSLUVAN, S. 2003. Managing Employee Attitudes and Behaviors in the Tourism and Hospitality Industry, Nova Science Publishers. VII. MCVETY, P. J., WARE, B. J. & WARE, C. L. 2008. Fundamentals of Menu Planning, Wiley. VIII. MULL, R. F., BEGGS, B. A. & RENNEISEN, M. 2009. Recreation Facility Management: Design, Development, Operations, and Utilization, Human Kinetics. IX. SWANSON, N. L. & TOLEDO, T. U. O. 2008. Knowledge and Beliefs of School District Superintendents and Food Service Managers in Michigan Toward Childhood Obesity and the Wellness Policy, The University of Toledo. | Assessment feedback | Assignment no. and Title Name: Rudranil Das ID: 110129132| Key components of this assignment| Performance on this component| Comment| | Excellent| Good| Fair| Poor| Very Poor| | Content: clear understanding of the topic and concepts; adequate coverage of the topic and relevance of the material; application of material| | | | | | | Research: evidence of adequate depth and breadth of research| | | | | | | Reasoning: a logical argument and discussionNote: In an academic essay you are expected to demonstrate to your reader that you have a position and perspective on the topic.| | | | | | | Presentation: Essay format and structure only, with Harvard (Author Date) style referencing and correct Reference List. (An additional Bibliography is not required but a Reference List is essential.)| | | | | | | Summary comment| The Graduate qualities being assessed by this assignment are indicated by an X:| | GQ1: operate effectively with and upon a body of knowledge| | GQ5: are committed to ethical action and social responsibility| | GQ2: are prepared for lifelong learning| | GQ6: communicate effectively| | GQ3: are effective problem solvers| | GQ7: demonstrate an international perspective| | GQ4:can work both autonomously and collaboratively| | | Assignment grade/mark|

Surveillance In George Orwells 1984 - 1219 Words

Surveillance, or a close watch kept over someone or something for a specific purpose, features prominently in George Orwell’s dystopian novel 1984. The book follows Winston Smith, a middle-aged man who lives in the futuristic society of Oceania, where the government of the Party, under the leadership of Big Brother, maintains strict control of the people and prevents free thought through propaganda, censorship, and surveillance. Winston tries to think freely while evading detection and succeeds for a time in having an affair with his co-conspirator Julia, but the Party eventually captures and re-educates both of them. Surveillance has also become a controversial issue in today’s society, as Heather Kelly discusses in her article â€Å"After†¦show more content†¦The nearly ubiquitous presence of telescreens in urban Oceania creates a constant fear of scrutiny among those who secretly harbor negative thoughts against the Party, precluding most free expression of thought because of the certainty of harsh punishment. Next, Winston encounters a second type of surveillance when his neighbor Mrs Parsons’s children pretend to confront him as a traitor during his visit to their apartment. After returning home, Winston reflects: â€Å"[her children] would be watching her night and day for symptoms of unorthodoxy †¦ hardly a week passed in which the Times did not carry a paragraph describing how some eavesdropping little sneak †¦ had overheard some compromising remark and denounced his parents to the Thought Police† (26-27). The Party trains Oceanic children through organizations like the Spies to zealously obey and promote the Party and to actively watch for and report any wrongdoing, even if the offender is their parent. In this way, it twists the natural parent-child bond into a tool for surveillance, destroying the exchange of free speech within the home environment and discouraging any hope of passing the principle of f ree thought onto the next generation. Finally, Winston mentions a third form of surveillance later on when he travels to a secluded woodland to converse freely with Julia: â€Å"In general you could not assume that you wereShow MoreRelatedGovernment Surveillance And Totalitarianism In George Orwells 19841593 Words   |  7 PagesThe Correlation of Government Surveillance and Totalitarianism in 1984 During the production of 1984, author George Orwell never envisioned a tangible reality housing the society he constructed. 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