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检索条件"主题词=multiple-input multiple-output"

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HPA Nonlinearities Mitigation by Joint Predistorter and Constellation Rotation Using MIMO Communication Systems

HPA Nonlinearities Mitigation by Joint Predistorter and Cons...

引用

13th Annual Wireless Telecommunications Symposium (WTS)

作者： Jan, Latif Zafar, Mohammad Haseeb Ahmed, Ishtiaq Babar, Mohammad Inayatullah Mahmud, Sahibzada Ali Khan, Gul Muhammad Gilani, Syed Raza Iqra Natl Univ Peshawar Pakistan Univ Engn & Technol Peshawar Pakistan Salman bin Abdul Aziz Univ Al Kharj Saudi Arabia

ISBN: (纸本)9781479912971

Nonlinearities in wireless communication channels foil the performance of the communication systems either at the transmitter or receiver end. This paper explains the concept of the transmitter-side nonlinearities that are induced by the High Power Amplifiers (HPA), the final stage at the transmitter side of the communication system. HPA nonlinearities create in-band and out-of-band distortions in wireless communication systems. The in-band distortion results in the degradation of overall performance of Bit Error Rate (BER) and the capacity of the mobile operations. On the other hand, out-of-band distortion creates the spectral broadening effects that degrade the performance of other operators usually operate in the near bands. This paper presents a novel method for the mitigation of HPA nonlinearities by joint predistorter and constellation rotation in multiple-input multiple-output (MIMO) wireless communication systems. The results reveal that the joint nonlinearity compensation technique in MIMO communications system enhances the overall error rate performance of the system. Furthermore to exploit the benefits of proposed technique;Symbol Error Rate (SER) curves for the MIMO multiplexing and Alamouti Space Time Block Codes (STBC) are presented with improvements in their signal to noise ratio.

关键词： High Power Amplifiers multiple-input multiple-output Symbol Error Rate Space Time Block Codes

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Secure Beamforming in DLA-Based CAP-MIMO

Secure Beamforming in DLA-Based CAP-MIMO

引用

41st IEEE Military Communications Conference (IEEE MILCOM) - Communications Supporting Military Operations in a Contested Environment

作者： Cheng, Zhenqiao Li, Nanxi Zhu, Jianchi She, Xiaoming Ouyang, Chongjun Chen, Peng China Telecom Beijing Res Inst 6G Res Ctr Beijing 102209 Peoples R China Beijing Univ Posts & Telecommun Beijing 100876 Peoples R China

ISBN: (纸本)9798350321814

This work proposes a novel secure beamforming design for discrete lens array (DLA)-based continuous aperture phased (CAP) multiple-input multiple-output wiretap channels. The base station exploits a switching network to connect a subset of its analog beams or DLA feed antennas to the available radio frequency chains. The switching network and transmit beamformers are jointly designed to maximize the weighted secrecy sum-rate for this setting. The principal design problem reduces to an NP-hard mixed-integer non-linear programming. We invoke the fractional programming technique and the penalty dual decomposition method to develop a tractable iterative algorithm that effectively approximates the optimal design. Our numerical investigations validate the effectiveness of the proposed algorithm and its superior performance compared with the benchmark.

关键词： Beam selection discrete lens array multiple-input multiple-output physical layer security

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MIMO Downlink Communication Employing Multi-user Transmitter Pre-processing Based on Vector Quantized Channel Spatial Information: Performance Results

MIMO Downlink Communication Employing Multi-user Transmitter...

引用

2nd IEEE International Conference on Communications and Signal Processing (ICCSP)

作者： Nagaradjane, Prabagarane Swaminathan, Shriram Krishnan, Suraj Damodaran, Selvam Paranche Swaminathan, Arun SSN Inst Dept ECE Madras Tamil Nadu India

ISBN: (纸本)9781467348669;9781467348652

In this letter, we report the performance of multi-user transmitter pre-processing (MUTP) assisted multiple-input multiple-output downlink (DL) communication, when the channel state information (CSI) required to formulate the preprocessing matrix is estimated at the receiver and fed back to the base station (BS) through feedback channels that experience noise. In particular, in our work the CSIs are estimated at the mobile stations (MSs) and the estimated CSIs (ECSIs) are decomposed by invoking singular value decomposition. The signal space of right-hand side unitary matrix of the decomposed ECSI associated with each of the MSs is then vector quantized and the magnitudes and phases are communicated to the BS as channel spatial information through noisy feedback channels. This vector quantized channel spatial information which is tainted by noise is recovered by employing minimum mean square error based linear detector. The recovered spatial information is then utilized to conceive the pre-processing matrix to deal with the DL multi-user interference (MUI). Our study shows that, MUTP realized with perfect CSI at the BS is capable of completely eliminating the MUI. However, vector quantized channel spatial information based MUTP results in imperfect removal of MUI, as the quantization errors and feedback channel induced errors play a principal role in determining its performance in the context of interference removal. Albeit the achievable symbol error rate (SER) slightly degrades compared to the perfect CSI case, we advocate that vector quantization seems to be an efficient approach in quantizing the necessary spatial information and feeding them back to the BS for the purpose of formulating the pre-processing matrix particularly in frequency division duplex aided wireless systems.

关键词： Channel spatial information perfect CSI minimum mean square error multi-antenna interference multi-user interference multiple-input multiple-output singular value decomposition vector quantization

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Bit-Interleaved Coded Modulation for Phase Shift Keying on the Hypersphere

Bit-Interleaved Coded Modulation for Phase Shift Keying on t...

引用

IEEE International Symposium on Information Theory (ISIT)

作者： Rachinger, Christoph Mueller, Ralf R. Huber, Johannes B. Univ Erlangen Nueremberg Erlangen Germany

ISBN: (纸本)9781509040964

We analyze the performance of Bit-Interleaved Coded Modulation (BICM) for MIMO systems employing Phase Shift Keying on the Hypersphere (PSKH), an extension of conventional PSK to higher dimensions. Because the quality of BICM relies on the bit-mapping between coded bits and signal points, PSKH constellations with superior distance properties and capacities might have poor power efficiency. In this paper, we analyze these losses in power efficiency and propose a new method to generate PSKH constellations, i.e., spherical codes, together with a BICM optimized bit-mapping. It turns out that for one bit per real dimension, individual QPSK per antenna is optimal, whereas for other constellation sizes notable gains can be achieved.

关键词： bit-interleaved coded modulation multiple-input multiple-output coded modulation spherical codes

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Outage Probability Performance Using Space Projection Algorithm in FD-MIMO Relay

Outage Probability Performance Using Space Projection Algori...

引用

Mediterranean Microwave Symposium (MMS)

作者： Rahman, Kazi Mustafizur Hakem, Nadir UQAT LRTCS Val Dor PQ Canada

ISBN: (纸本)9781538655757

This paper investigates the performance of Full-Duplex (FD) multiple-input multiple-output (MIMO) relays in an indoor wireless communication system. The FD-MIMO system use Amplify-and-Forward (AF) approach to reduce interferences around relay and increase throughput capacity between both ends of the link. At the relay level, a major issue is to minimize the self-interference (SI) generated by a simultaneous receiving and transmitting of the same signal. To address SI interferences, we proposed a space projection algorithm (SPA) involving Null-space projection (NSP) and subspace projection (SP) algorithms. The simulation results reveal that the proposed SPA minimized the loop interferences and boosted up the link capacity.

关键词： Full-Duplex Amplify and forward (AF) Self-interference multiple-input multiple-output Space projection algorithm Null space projection Sub space projection

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Gap Analysis of VLC-MIMO Capacity Lower Bound with Different Signal Distributions 17

Gap Analysis of VLC-MIMO Capacity Lower Bound with Different...

引用

17th IEEE International Wireless Communications and Mobile Computing Conference (IEEE IWCMC)

作者： Wang, Xiaoqian Liang, Xia Yuan, Yifei Dong, Jing Wang, Hanning Wang, Qixing China Mobile Res Inst Beijing Peoples R China

ISBN: (纸本)9781728186160

Visible light communication (VLC) multiple-input multiple-output (MIMO) technology is a promising technology in 6G. However, the existing capacity formulae for radio frequency (RF) cannot be directly used for VLC due to the constraints of transmitted signals and unique channel characteristics. In this paper, we make a comparison of different signal distribution. Firstly, we analyze the relationship between transmitted and received signals based on zonotopes model. Then the capacity gap between the truncated Gaussian distribution and uniform distribution is analyzed. Simulations show that the uniform distribution has a better performance than truncated Gaussian, which may promote new signal design for VLC.

关键词： 6G Visible Light Communication multiple-input multiple-output Zonotopes Lower Bound Truncated Gaussian Distribution Uniform Distribution

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Rapid Implementation and Demonstration of Radio Applications Using WISCANet 32

Rapid Implementation and Demonstration of Radio Applications...

引用

32nd IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE PIMRC)

作者： Holtom, Jacob Gubash, Gerard Herschfelt, Andrew Ma, Owen Standage-Beier, Wylie Yu, Hanguang Bliss, Daniel W. Arizona State Univ Ctr Wireless Informat Syst & Computat Architectur Tempe AZ 85281 USA

ISBN: (纸本)9781728175867

Implementing new RF applications has traditionally required significant time and expertise, even for relatively simple algorithms. Software-defined radios (SDRs) have recently enabled rapid implementation and validation of RF applications without specialized hardware or advanced programming skills. We further facilitate this rapid application development by constructing WISCANet - a diverse network of commercial SDRs with specialized control software. WISCANet automatically configures these SDRs and controls transmit and receive events with minimal user input. This allows users to rapidly implement over-the-air RF applications by simply defining the baseband processing chain in software. Furthermore, WISCANet emulates real-time operations, which allows users to test real-time applications without the usual complications such as processing speed or hardware limitations. In this paper, we present recent improvements to the WISCA Software-Defined Radio Network (SDR-N). These improvements include configurable and flexible multi-channel phase coherence and support for both MATLAB and Python applications. The open source release of this software may be found on GitHub at: https://***/WISCA

关键词： Software-defined radio software-defined radio network cognitive radio multiple-input multiple-output

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A new application of DS-CDMA in BLAST systems

A new application of DS-CDMA in BLAST systems

引用

International Conference on Communications, Circuits and Systems

作者： Li, YZ Liao, GS Wang, F Xidian Univ Sch Elect Engn Xian 710071 Peoples R China

ISBN: (纸本)0780386477

Bell Layered Space-Time Architecture (BLAST) is a multi-antenna communication structure with high spectrum efficiency, and it has found wide applications in LANs and WANs. However, since it does not make full use of the diversity provided by multiple antennas its performance is much poor than other Space-Time Coding approaches. In this paper, a new application of DS-CDMA in BLAST is proposed, The new system introduces Orthogonal Spreading Sequences (OSS) into the transmitter while retains the basic structure of BLAST. The proposed receiver suppresses interferences from other antennas by the orthogonality contained in the received signals, and extracts information from each receive antenna using RAKE receiving principle to construct efficient statistic decision. Simulation results show that the proposed system achieves good performance over flat fading channels at the cost of a little loss in spreading spectrum.

关键词： BLAST RAKE receiving multiple-input multiple-output orthogonal spreading sequence

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Optimal waveforms for MIMO radar systems employing the generalized detector

Optimal waveforms for MIMO radar systems employing the gener...

引用

Conference on Signal Processing, Sensor Fusion, and Target Recognition XIX

作者： Tuzlukov, Vyacheslav Kyungpook Natl Univ EECS Sch Taegu 702701 South Korea

ISBN: (纸本)9780819481610

We consider the problem of waveform design for multiple-input multiple-output (MIMO) radar systems employing the generalized detector that is constructed based on the generalized approach to signal processing in noise. We investigate the case of an extended target and without limiting ourselves to orthogonal waveforms. Instead, we develop a procedure to design the optimal waveform that maximizes the signal-to-interference plus-noise ratio (SINR) at the generalized detector output. The optimal waveform requires a knowledge of both target and clutter statistics. We also develop several suboptimal waveforms requiring knowledge of target statistics only, clutter statistics only, or both. Thus, the transmit waveforms are adjusted based on target and clutter statistics. A model for the radar returns that incorporates the transmit waveforms is developed. The target detection problem is formulated for that model. Optimal and suboptimal algorithms are derived for designing the transmit waveforms under different assumptions regarding the statistical information available to the generalized detector. The performance of these algorithms is illustrated by computer simulation.

关键词： Generalized detector additive white Gaussian noise detection performance multiple-input multiple-output signal-to-interference plus-noise ratio (SINR)

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Spatial-Wideband Effect in Line-of-Sight MIMO Communication

Spatial-Wideband Effect in Line-of-Sight MIMO Communication

引用

IEEE International Conference on Communications (ICC)

作者： Mojahedian, Mohammad M. Attarifar, Masoud Lozano, Angel Univ Pompeu Fabra Barcelona Spain

ISBN: (数字)9781538683477

ISBN: (纸本)9781538683477

This paper addresses the spatial-wideband effect in line-of-sight multiple-input multiple-output channels. This effect arises once the bandwidth is large enough that the differences in propagation delays for distinct transmit-receive antenna pairs cease to be negligible relative to the symbol period;this, in turn, gives rise to intersymbol interference. The impact of this effect is quantified as a function of the relevant geometric parameters (range, array orientations, antenna spacings) and a family of scalable solutions is proposed to counter it. In particular, a solution based on per-antenna delay lines at transmitter and receiver is shown to be highly effective, and a criterion is derived to set those delay lines as a function of the channel.

关键词： Line-of-sight communication multiple-input multiple-output spatial-wideband effect beam squint precoding

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