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检索条件"主题词=precoding matrix"

共 38 条记录，以下是31-40 订阅

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An Enhanced feedback Method for Coordinated Multiple Point Joint Transmission

An Enhanced feedback Method for Coordinated Multiple Point J...

引用

IEEE International Conference on Electronics, Communications and Control (ICECC)

作者： Jiang Jing Sun Changyin Xian Univ Post & Telecom Coll Commun & Informat Technol Xian Peoples R China

ISBN: (纸本)9781457703218

Coordinated Multi-point Joint transmission with ideal channel state information can yield significant performance improvement due to coordinate inter-cell inferences, however the performance gains would be distinctly impacted with imperfect channel state information. In this paper, we show how downlink CoMP JT can be supported by an enhanced feedback method with reasonable feedback overhead. The feedback is quantized using codebook based vector-quantization for the per-cell CSI feedback and scalar-quantization for additional inter-cell relative CSI feedback (i.e., relative phase and/or amplitude). The CoMP-JT performance with the enhanced feedback can acquire almost similar gains as ideal CSI feedback.

关键词： Coordinated Multi-point Joint transmission CSI Feedback precoding matrix

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Joint Base Station Selection and Linear precoding for Cellular Networks with Multi-cell Processing

Joint Base Station Selection and Linear Precoding for Cellul...

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IEEE Region 10 Conference on TENCON 2010

作者： Zeng, Yong Gunawan, Erry Guan, Yong Liang Liu, Jin Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

ISBN: (纸本)9781424468904

Multi-cell processing (MCP) is regarded as an effective way for interference mitigation in cellular networks. We propose a joint Base Station (BS) selection and linear precoding design algorithm for the downlink transmission in MCP enabled networks. The algorithm solves a regularized utility maximization problem to find a sparse solution for the precoding matrix. The BS selection is thus based on the sparsity pattern of the resulted precoding matrix. With the joint design, the proposed algorithm rigorously takes into account and optimizes the effect of BS selection on the overall system performance. The problem of total power minimization for target SINR, which can be cast as a Second Order Cone Program (SOCP) is used as an example for illustration. Simulation is performed to compare the proposed algorithm with the BS selection schemes in literature. It shows that our joint algorithm not only requires less power for target SINR, but also dramatically reduces the computational complexity.

关键词： cellular networks cellular radio downlink transmission interference mitigation interference suppression joint base station selection linear precoding matrix algebra multi-cell processing optimisation precoding matrix regularized utility maximization probl

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Differential precoding Scheme of LTE Systems over Temporally Correlated Channels

Differential Precoding Scheme of LTE Systems over Temporally...

引用

IEEE 74th Vehicular Technology Conference (VTC)

作者： Li, Xun Park, NoeYoon Kim, YoungJu Chungbuk Natl Univ Coll Elect & Comp Engn Chungbuk 361763 South Korea

ISBN: (纸本)9781424483273

In this paper, a novel differential precoding scheme is proposed for LTE systems. The proposed scheme utilizes a differential codebook to update the precoding matrix. Due to the temporal correlation of adjacency time slots in temporally correlated channels, the current precoding matrix is restricted in a limited scope around the previous precoding matrix. This approach utilizes the differential information of the channel instead of quantizing the whole channel subspace, which involves less quantization distortion. The proposed precoding scheme has perfect compatibility with the conventional LTE precoding scheme. So, it has the good properties of LTE codebooks. We analyze the capacity and SER of the differential precoding scheme and compare the results with the performances of other existing precoding schemes.

关键词： Correlation Indexes LTE precoding scheme LTE systems Long Term Evolution Modulation Receivers Signal to noise ratio Transmitters Wireless communication channel coding differential precoding scheme matrix algebra precoding precoding matrix quantization dis

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Enhancing Multiuser MIMO in Practical Cellular Systems

Enhancing Multiuser MIMO in Practical Cellular Systems

引用

54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Prasad, Narayan Yue, Guosen Jiang, Meilong Khojastepour, Mohammad Rangarajan, Sampath NEC Labs Amer Princeton NJ 08540 USA

ISBN: (纸本)9781424492688

We consider a downlink multi-user multi-input-multi-output (MU-MIMO) fading channel wherein the base station can schedule several user terminals on the same time-frequency resource. A severe practical problem in MU-MIMO is that when computing its feedback report, a user does not have an accurate estimate of the interference it might see (if scheduled) from the signals intended for the other co-scheduled users. This results in a mismatch between the user reported signal-to-interference-plus-noise-ratio (SINR) and the one it actually observes in the aftermath of scheduling. To alleviate this problem we propose to inform each user (in a slow or semi-static manner) about the rank of the precoding matrix that it should report, along with an estimate of the total number of streams that the base station expects to co-schedule on a time-frequency resource. The suggested rank and the expected total number of streams can be user-specific and together convey the expected total number of co-scheduled interfering streams to the intended user. Each user then computes one or more SINRs for all the precoding matrices having the suggested rank and reports its preferred precoding matrix along with the corresponding SINRs. The SINRs are computed after assuming that the co-scheduled interfering streams will be transmitted along vectors isotropically distributed in the orthogonal complement of the range of the precoding matrix being examined. Alternatively, the SINRs can be computed after assuming that the co-scheduled interfering streams will be transmitted along the worst-case choice of mutually orthogonal vectors that lie in the orthogonal complement. We show that the proposed solutions, while requiring negligible additional signalling overhead, mitigate the mismatch problem to a large extent and result in significant improvements in system throughput.

关键词： Approximation methods Base stations Interference MIMO MIMO communication Signal to noise ratio Time frequency analysis Vectors base station cellular radio cellular systems channel coding co-scheduled interfering streams downlink multi-user multi-input-multi-output fading channel fading channels feedback report mismatch problem multiuser MIMO multiuser channels precoding precoding matrix scheduling signal-to-interference-plus-noise-ratio signalling overhead system throughput time-frequency resource user terminals

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OPTM3SEC: OPTIMIZING MULTICAST IRS-AIDED MULTIANTENNA DFRC SECRECY CHANNEL WITH MULTIPLE EAVESDROPPERS 47

OPTM3SEC: OPTIMIZING MULTICAST IRS-AIDED MULTIANTENNA DFRC S...

引用

47th IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Mishra, Kumar Vijay Chattopadhyay, Arpan Acharjee, Siddharth Sankar Petropulu, Athina P. US CCDC Army Res Lab Adelphi MD 20783 USA Indian Inst Technol New Delhi 110016 India Rutgers State Univ Piscataway NJ 08854 USA

ISBN: (纸本)9781665405409

With the use of common signaling methods for dual-function radar-communications (DFRC) systems, the susceptibility of eavesdropping on messages aimed at legitimate users has worsened. For DFRC systems, the radar target may act as an eavesdropper (ED) that receives a high-energy signal thereby leading to additional challenges. Unlike prior works, we consider a multicast multi-antenna DFRC system with multiple EDs. We then propose a physical layer design approach to maximize the secrecy rate by installing intelligent reflecting surfaces in the radar channels. Our optimization of multiple ED multicast multi-antenna DFRC secrecy rate (OptM3Sec) approach solves this highly nonconvex problem with respect to the precoding matrices. Our numerical experiments demonstrate the feasibility of our algorithm in maximizing the secrecy rate in this DFRC setup.

关键词： Dual-function radar-communications intelligent reflecting surfaces multicasting precoding matrix secrecy rate maximization

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Bstj 46: 7. September 1967: precoding for Multiple-Speed Data Transmission. (Chang, Robert W.)

引用

2016年

Bstj 46: 7. September 1967: precoding for Multiple-Speed Data Transmission. (Chang, Robert W.) by published by

关键词： (chang, bell system channel characteristics data data rate data transmission eye eye opening eye openings matrix multiple-speed openings partial response precoder precoding precoding matrix robert september subspace summing circuit system technical transmission transmitted vectors

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A SVD-Based Optimum Algorithm Research for Macro-Femto Cell Interference Coordination

A SVD-Based Optimum Algorithm Research for Macro-Femto Cell ...

引用

IEEE Vehicular Technology Conference

作者： Kaiyue Yan Yan Yang Shuping Dang State Key Lab. of Rail Traffic Control and Safety Beijing Jiaotong University Department of Engineering Science University of Oxford

ISBN: (纸本)9781479980895

The intra-tier interference in heterogeneous networks becomes more serious when the number of macro-femto cells dramatically increases. Based on the singular value decomposition (SVD) algorithm, this paper proposes an optimized interference alignment (IA) algorithm to improve the macro-femto cell downlink rate. To achieve the largest degrees of freedom (DOF), we adopt the precoding matrix as a powerful tool to mitigate the effect of inter-channel interference (ICI). In comparison with the conventional interference coordination methods, the SVD algorithm is capable of adjusting the coefficients of the precoding matrix with lower complexity. Furthermore, zero-forcing algorithm is also used to combat ICI in this proposed IA algorithm. The numerical results show that ICI can be suppressed effectively and the system performance in terms of throughput and signal-to-interference-plus-noise ratio (SINR) can be improved considerably.

关键词： Heterogeneous network Macro-femto cell Interference alignment Singular value decomposition precoding matrix

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An interference alignment scheme for sum rate enhancement in multi-cell communication systems

An interference alignment scheme for sum rate enhancement in...

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IEEE International Conference on Signal Processing, Communications and Computing

作者： Juan Wei Shiya Zhang Wenjing Wang Man Zhao Sch. of Commun. Eng. Xidian Univ. Xi'an China

ISBN: (纸本)9781479989218

In this paper, maximum rate interference alignment (MR-IA) algorithm is proposed for multi-cell downlink interference systems. Based on the researches on distributed interference alignment (IA) algorithms, the proposed algorithm can further enhance the sum rate. In this scheme, the precoding matrices are optimized by searching precoding alone the gradient ascent direction of throughput. In this process, the step length is decreased with multiplying a parameter smaller than 1, which leads to the degradation to rank constrained rank minimization interference alignment (RCRM-IA) algorithm. Thus, the algorithm can attain interference alignment as well as the throughput improvement eventually. Simulation examples are provided showing that the proposed algorithm can enhance the sum rate obviously compared with the conventional algorithms.

关键词： cellular radio gradient methods matrix algebra minimisation precoding radiofrequency interference MR-IA algorithm RCRM-IA algorithm gradient ascent direction maximum rate interference alignment algorithm multicell communication system multicell downlink interference system precoding matrix rank constrained rank minimization distributed interference alignment algorithm sum rate enhancement Algorithm design and analysis Base stations Interference Mathematical model Optimization Receivers Transmitters Interference alignment sum rate Algorithm design and analysis prediction coding Radiofrequency interference BASE STATION cellular radio gradient methods matrix algebra Transmitters interference Receivers COMMUNICATION SYSTEMS Mathematical Model interference

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