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IEEE 79th Vehicular Technology Conference (VTC-Spring)

作者： Duc Hiep Vu Van Bien Pham Xuan Nam Tran Chi Hieu Ta Le Quy Don Tech Univ Cau Giay Ha Noi Vietnam

ISBN: (纸本)9781479944828

This paper presents a design of two-way two-hop relay network using physical layer network coding (PNC) in which multiple antennas are used at all nodes. For transmission over the multiple-input multiple-output channels, the Alamouti's space-time block code (STBC) is used for transmission while linear detection is used for signal estimation at all nodes. In order to facilitate linear detection, we develop an equivalent multiuser STBC model for the proposed network and design the sum-and-difference matrix which is suitable for signal estimation. Simulation results show that the proposed network achieves diversity order 2 with polynomial complexity.

关键词： MIMO communication antenna arrays computational complexity matrix algebra network coding relay networks (telecommunication) signal processing space-time block codes Alamouti space-time block code MIMO channels PNC diversity order 2 equivalent multiuser STBC model linear detection multiple antennas multiple-input multiple-output channels physical layer network coding polynomial complexity signal estimation sum-and-difference matrix two-way two-hop relay network design Antennas Estimation MIMO Network coding Relay networks (telecommunications) Vectors linear detection Network coding Signal estimation space time block coding multiple antenna PNC MIMO communication matrix algebra Antenna arrays multiple input multiple output systems ANTENNA signal processing complexity classes Relay networks

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Performance and Compensation of I/Q Imbalance in Differential STBC-OFDM

Performance and Compensation of I/Q Imbalance in Differentia...

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IEEE Global Communications Conference

作者： Lei Chen Ahmed G. Helmy Guangrong Yue Shaoqian Li Naofal Al-Dhahir National Key Laboratory of Communications University of Electronic Science and Technology of China The University of Texas at Dallas

ISBN: (纸本)9781509013296

Differential space time block coding (STBC) achieves full spatial diversity and avoids channel estimation overhead. Over highly frequency-selective channels, STBC is integrated with orthogonal frequency division multiplexing (OFDM) to achieve high performance. However, low-cost implementation of differential STBC-OFDM using direct-conversion transceivers is sensitive to In-phase/Quadrature-phase imbalance (IQI). In this paper, we quantify the performance impact of IQI at the receiver front-end on differential STBC-OFDM systems and propose a compensation algorithm to mitigate its effect. The proposed receiver IQI compensation works in an adaptive decision-directed manner without using known pilots or training sequences, which reduces the rate loss due to training overhead. Our numerical results show that our proposed compensation algorithm can effectively mitigate receive IQI in differential STBC-OFDM.

关键词： image quality instrument compensated space time block coding receiver front end Orthogonal frequency division multiplexing training sequence spatial diversity Differential

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Performance of Dual-Hop MIMO Network with Partial Relay Selection and Fixed Gain

Performance of Dual-Hop MIMO Network with Partial Relay Sele...

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European Wireless 2016;22th European Wireless Conference

作者： Ahmet Yilmaz Oguz Kucur

In this work, unified performance analysis of multi-antenna dual-hop network with fixed relay gain and partial relay selection is studied over flat Nakagami-m fading channels. In considered scenarios, the source and destination communicate with help of a relay, which is selected from a group of relays, without direct source-to-destination link. The source, relays and destination are either equipped with single or multiple antennas. Maximal ratio transmission, transmit antenna selection and orthogonal space-time block coding are considered as transmission techniques at the source and relays. On the other hand, maximal ratio combining and selection combining are studied as reception techniques. Amplify-and-forward with fixed relay gain case is investigated. Outage probability, signal-to-noise ratio moments, moment generating function and symbol error probability expressions are derived to quantify the performance of the networks. Moreover, asymptotic outage probability and symbol error probability expressions are also derived to obtain diversity order. Analytical results are validated by Monte Carlo simulations.

关键词： relay space time block coding diversity reception destination Transmission techniques multiple antenna Fixed Gain Error probability

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Relay transmit power allocation for distributed-space-time block code cognitive small cell networks

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IET COMMUNICATIONS 2015年第14期9卷 1691-1698页

作者： Ndong, Massa Fujii, Takeo Univ Electrocommun Adv Wireless Commun Res Ctr AWCC Chofu Tokyo 1828585 Japan

Small cell networks enhance spectrum efficiency by handling the indoor traffic of mobile networks on a frequency-reuse operation. Since most of the current mobile traffic happen in indoor, the authors introduce a prioritisation shift by imposing a limitation on the outage generated by the outdoor mobile system to the indoor small cells. The prioritisation shift consists of setting an outage probability threshold limitation on the macrocell system which is classically considered as a primary system. In this study, they consider downlink spectrum sharing between a system consisting of small cells and a macrocell with relays. The relays constitute a distributed-space-time block code (STBC) relaying for the outdoor system terminals. New closed-form expressions are derived to validate the proposed bit error rate (BER) function used in their optimisation algorithm considering STBC with unequal branch SNR. They propose a joint transmit antenna selection and power allocation which minimises the proposed BER. The proposed optimisation yields a dynamic selection of the relays with power control pertaining to the outdoor mobile terminal performance. The simulation results show that their proposal exhibits a better BER compared with the conventional Alamouti STBC with equal power allocation.

关键词： spectral efficiency relay Optimization algorithms transmitting antennas Transmitter power primary system Outdoors space time block coding macrocells power splitting mobile networking

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GA based adaptive receiver for MC-CDMA system

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TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES 2015年第Sup-1期23卷 2267-2277页

作者： Khan, Muhammad Adnan Umair, Muhammad Choudhry, Muhammad Aamer Saleem Isra Univ Sch Engn & Appl Sci Islamabad Pakistan

Multicarrier systems like the multicarrier code division multiple access (MC-CDMA) systems are designed for maximum usability of available bandwidth. We use the MC-CDMA system with Alamouti's space time coding in this paper. We propose the genetic algorithm (GA) in order to calculate MC-CDMA receiver weights with two variation schemes. The proposed schemes reduce receiver complexity. The bit error rate and convergence rate are also improved by increasing the number of genes and chromosomes of the GA in both schemes as compared with conventional LMS based receivers of the MC-CDMA system. This is verified via simulations.

关键词： Multiple input and multiple output multicarrier code division multiple access space time block coding genetic algorithm

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Performance Analysis of Diagonal Precoding for Alamouti STBC over Nakagami-m Fading Channels

Performance Analysis of Diagonal Precoding for Alamouti STBC...

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IEEE Vehicular Technology Conference

作者： Ankit Garg Manav R. Bhatnagar Department of Electrical Engineering Indian Institute of Technology-Delhi

ISBN: (纸本)9781509016990

In this paper, we study the problem of one bit imperfect feedback based diagonal precoding for Alamouti space-time block code in a 2 × 1 multiple-input single-output (MISO) communication system. The communication links are assumed to be Nakagami-m distributed. An accurate bit error rate (BER) expression of the considered MISO system is derived with erroneous feedback by using the order statistics. The average BER of the precoding scheme is minimized to find the optimized transmit weights. Further, we also derive the Shannon capacity of the scheme by using the moment generating function approach. Simulated and analytical results show that a significant capacity gain is achieved by the considered scheme as compared to the uniform power allocation over the Nakagami-m fading channels.

关键词： space time block coding prediction coding Moment generating function Fading channels Bit error rate power splitting Diagonal multiple-input single-output Telecommunication links

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Performance of Maximum Likelihood Detection using Antenna Diversity Technique

Performance of Maximum Likelihood Detection using Antenna Di...

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International Conference on Signal Processing, Communication, Power and Embedded System

作者： Vandana B. Bagde C.G. Dethe Electronics & Communication Engineering Priyadarshini Institute of Engg. & Technology Nagpur India Electronics & Communication Engineering Academic Staff College RTMNU Nagpur India

ISBN: (纸本)9781509046218

Owing to the forever growing demand for faster data transmission speed in the recent or future telecommunication systems, the multiple antenna systems have been actively investigated and successfully deployed for the emerging broadband wireless access networks (e.g., Mobile WiMAX). Even when a wireless channel with high channel capacity is known, we still require to find superior techniques to achieve high speed data transmission or high reliability. Multiple antenna techniques can be broadly classified into two categories: diversity techniques and spatial-multiplexing techniques. The diversity techniques intend to receive the same information-bearing signals in the multiple antennas or to transmit them from multiple antennas, in so doing improving the transmission consistency. Diversity techniques are used to mitigate degradation in the error performance due to unstable wireless fading channels, for example, subject to the multipath fading etc. A basic idea of the diversity techniques is to convert Rayleigh fading wireless channel into more stable AWGN-like channel without any catastrophic signal fading. When the spatial-multiplexing Techniques are used, the maximum achievable transmission speed can be the same as the capacity of the MIMO channel;however, when the diversity techniques are used, the achievable transmission speed can be much lower than the capacity of the MIMO channel. Spatially multiplexed MIMO (SM-MIMO) systems can transmit data at a higher speed than MIMO systems using antenna diversity. However, spatial demultiplexing or signal detection at the receiver side is a challenging task for SM MIMO systems. This paper addresses the signal detection technique using maximum likelihood detection for SM MIMO systems.

关键词： space time block coding maximum likelihood detection diversity

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Cooperative space-time block coded full-duplex relaying over frequency-selective channel

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IET COMMUNICATIONS 2015年第7期9卷 960-968页

作者： Jeon, Sungho Han, Jae-Shin Choi, Jeong-Min Seo, Jong-Soo KBS Tech Res Inst Seoul 150790 South Korea Yonsei Univ Dept Elect & Elect Engn Seoul 120749 South Korea

In this study, the authors investigate a distributed time-reversal space-time block coded (D-TR-STBC) system with amplify-and-forward full duplex relaying (FDR) over frequency-selective channel. In the first, they present an FDR to use in a cooperative D-STBC relaying in which a relay transmits the delayed signal as much as one frame in order to maintain the orthogonal property of STBC at the destination. Then, they briefly present the conventional full self-interference cancellation (SIC) which continuously removes the self-interference signal. As an alternative to the full SIC, they further introduce a partial SIC that periodically performs the SIC process. As a result, it can reduce cancellation processing by a half time compared to the full SIC. In the second, they propose the efficient and yet optimal destination structure consisting of the forward interference cancellation (IC), backward IC and joint equalisation and data combining in order to obtain a full coding gain. It is shown that the proposed D-TR-STBC-FDR system has similar to 3 dB signal-to-noise ratio gain compared to cooperative half-duplex relaying with D-TR-STBC while it has the same diversity order. In addition, they show that there are no performance losses between FDR with full SIC and FDR with partial SIC.

关键词： self-interference FULL DUPLEX Half Life destination relaying delayed signal space time block coding selective channel CANCELLATIONS

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Performance Comparison of space time block Codes for Different 5G Air Interface Proposals

Performance Comparison of Space Time Block Codes for Differe...

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WSA 2016;20th International ITG Workshop on Smart Antennas

作者： Sher Ali Cheema Kristina Naskovska Mohammadhossein Attar Bilal Zafar Martin Haardt

Several new multi-carrier transmission techniques such as Filter Bank Multi-Carrier (FBMC), Universal Filtered Multi-Carrier (UFMC), and Generalized Frequency Division Multiplexing (GFDM) are being proposed as alternatives to orthogonal frequency division multiplexing (OFDM) for future wireless communication systems. Since multiple-input multiple-output (MIMO) will be an integral part of the 5th Generation (5G) cellular systems, the performance of these new schemes needs to be investigated for MIMO system. space-time block codes (STBC) are widely used in MIMO system because of their ability to achieve full diversity and the simple linear processing at the receiver. In this work, we propose different approaches for the application of STBCs in UFMC. These approaches are based on type of receive filtering used for UFMC. Moreover, we also investigate the performance of these proposed schemes over frequency selective environments, and compare it with the performance of the other non-orthogonal techniques mentioned above.

关键词： Wireless communication systems multiple input multiple output systems space time block coding block codes Transmission techniques Orthogonal frequency division multiplexing Communication channels air interface Filtration

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Approximate Analysis of MIMO based Cooperative Communication in α - μ Channel Distribution

Approximate Analysis of MIMO based Cooperative Communication...

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International Conference on Communication Systems and Networks

作者： Amodh Kant Saxena Shashank Goyal Rakhesh Singh Kshetrimayum Department of Electrical Engineering and Computer Science UC Irvine Open Systems Operations Visa Inc. Department of Electronics and Electrical Engineering IIT Guwahati

ISBN: (纸本)9781467396233

In the present work we have analysed the performance of a dual hop cooperative communication system. Multiple relays are taken for DF (Decode and Forward) relaying of signal from source to the destination over i.i.d. α - μ generalized fading channel distribution. Multiple antennas are realized at all the receive and transmit nodes on the source, relay and destination with Orthogonal space time block coding (OSTBC) implementation. Theoretical approximation for Symbol Error Rate (SER) performance is evaluated for Binary Phase Shift Keying (BPSK) and 4-Quadrature Amplitude Modulation (4-QAM) schemes as a function of Signal to Noise Ratio (SNR) using the Moment Generating Function (MGF) of the channel distribution. The variation of performance with number of relays used is studied. Monte Carlo simulation is used for verification of the analytical expression obtained.

关键词： approximate analysis Binary phase shift keying cooperative communication relay destination multiple input multiple output systems signal to noise ratios space time block coding

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