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Improved Tomlinson-Harashima Precoding with Transmit Antenna Selection and User Sorting

Improved Tomlinson-Harashima Precoding with Transmit Antenna...

引用

IEEE Vehicular Technology Conference

作者： Junyuan Dong Ling Qiu Yuanjie Li Key Laboratory of Wireless-Optical Communications Chinese Academy of Sciences School of Information Science and Technology University of Science and Technology of China RAN research department Huawei Technologies

ISBN: (纸本)9781538663592;9781538663585

In this paper, we introduce a joint antenna selection and user sorting scheme in multi-user multiple-input multiple-output (MU-MIMO) systems, in which Tomlinson-Harashima precoding (THP) is adopted. In MU-MIMO with THP, antenna selection and user sorting are important means to improve the system performance. By considering the interrelationship between antenna selection and user sorting in THP, based on the scheme, we propose an efficient algorithm to solve the antenna selection and user sorting jointly, which achieves near performance of the optimal one obtained by exhaustive search. Analytical results demonstrate the proposed scheme has low complexity. Simulation results show the availability of our proposed scheme.

关键词： grade pirarubicin transmitting antennas sorting programs prediction coding ANTENNA antennae System performance multiple input multiple output systems efficient algorithm Scheme

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Experimental Comparison of Precoding Schemes for CR-MIMO Systems for Interference Avoidance

Experimental Comparison of Precoding Schemes for CR-MIMO Sys...

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IEEE International Conference on System Engineering and Technology

作者： Ireyuwa E. Igbinosa Olutayo O. Oyerinde Viranjay M. Srivastava Stanley H. Mneney School of Electrical Electronic and Computer Engineering University of KwaZulu-Natal School of Electrical and Information Engineering University of the Witwatersrand

ISBN: (纸本)9781467367141

In this paper we have studied precoding schemes for cognitive radio multiple input multiple output (CR-MIMO) system which coexist with a primary time division duplexing system. We have proposed two robust methods in enhancing the existing sensing projection based scheme (SP-Based precoding scheme). The first proposed scheme is the full projection based precoding scheme (FP-Based precoding). In this scheme, the Cognitive radio transmission is fully projected into a calculated null space of the interference channel. This scheme possesses the ability to increase the CR throughput without causing interference to the primary network. The scheme has the ability to increase the CR throughput without causing interference to the primary network. In the second scheme, the CR transmission is projected into a subspace area which partially covers the null space of the interference channel. This scheme however further improves the CR-throughput within the tolerance level of the primary system. The results presented shows that proposed schemes performance overwhelms that of the existing SP-Based precoding scheme.

关键词： Cognitive radio Interference avoidance (IA) Multiple input multiple outputs Precoding Time division duplexing prediction coding Cognitive radio multiple input multiple output systems time division duplex Scheme tolerance level primary network interference interference

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Over-the-Air Aided Precoding for DL Massive MIMO with Distributed Antenna Sites

Over-the-Air Aided Precoding for DL Massive MIMO with Distri...

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European Conference on Antennas and Propagation

作者： Jocelyn Aulin R&D Center Huawei Technologies Sweden AB

ISBN: (纸本)9781509022342

We consider downlink (DL) transmission for a Time Division Duplex (TDD) LTE base station in a target cell with centralized baseband processing for a distributed Massive MIMO antenna system. The remote antenna units of the base station, distributed geographically within the target cell, also supports baseband processing complementing the centralized baseband unit. For DL data transmission, two-stage linear precoding, is used. The outer precoder is selected as the conjugate transpose of the effective downlink channel matrix, and has a distributed implementation across remote antenna sites, with final precoding achieved "over-the-air" via the linear superposition of the transmitted signals. The inner block diagonal precoder is derived by maximizing independently, the downlink achievable rate for each user. Significant gains in spectral efficiency results are obtained for two-stage precoding relative to single-stage precoding and for two-antenna sites relative to single-antenna site.

关键词： Over-the-Air Aided Precoding prediction coding Target cells Antenna arrays Downlink BASE STATION

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Low Complexity Vector Precoding for Fast Fading MIMO Downlinks

Low Complexity Vector Precoding for Fast Fading MIMO Downlin...

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IEEE Global Communications Conference

作者： Christos Masouros Mathini Sellathurai Tharm Ratnarajah Dep. of Electrical & Electronic Eng. University College London London UK School of Eng. and Physical Sciences Herriot Watt University Edinburgh UK School of Engineering University of Edinburgh Edinburgh UK

ISBN: (纸本)9781479913510

Vector precoding (VP) requires the feed-forwarding of the transmit scaling factor to the receiver for correct detection. This can be problematic in fast fading scenarios where the statistics of the scaling factor change frequently and in limited feedback scenarios where the feed-forwarding to the receiver is prone to quantization errors. In response to this, a new VP scheme is proposed for the downlink of multi-user multiple input multiple output (MU-MIMO) systems with limited feedback. The proposed VP circumvents the need for receive-scaling by constraining the search of perturbing vectors to the area in the symbol constellation which is constrictive to the information symbols, i.e. the area where the distances from the decision thresholds are increased with respect to a distance threshold. By doing this, the perturbation quantities need not be removed at the receiver and successful detection can be done without the use of the modulo operation and the scaling factor. In addition, instead of a computationally expensive sphere search used in conventional VP, the proposed scheme uses a MinMax Optimization to select the perturbation quantities. As illustrated by the analysis and results, the error floor encountered in conventional VP in limited feedback scenarios is avoided in the proposed scheme.

关键词： Vector precoding limited feedback multi-user MIMO non-linear precoding Scale factor multiple input multiple output systems fast fading Receivers multi-user prediction coding Threshold error floor Cloning Vectors Quantization Feedback

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Performance Evaluation of Non-orthogonal Multiple Access Combined with Opportunistic Beamforming

Performance Evaluation of Non-orthogonal Multiple Access Com...

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IEEE Vehicular Technology Conference

作者： Anxin Li Anass Benjebbour Atsushi Harada DOCOMO Beijing Communications Laboratories Co. Ltd. Radio Access Network Development Department NTT DOCOMO INC.

ISBN: (纸本)9781479944811

Non-orthogonal multiple access (NOMA) utilizing power domain and advanced receiver is a promising technique for future radio access. Multi-antenna techniques have been deeply studied during the past decade to boost system performance by virtue of spatial multiplexing and/or spatial diversity. It is of great interest to study how to efficiently and effectively combine the two techniques together for further system performance improvement. This paper investigates on the combination of NOMA with opportunistic beamforming (OBF), which has been proposed as a practical multi-antenna transmission scheme with good performance and very limited feedback. The key design issues of NOMA with OBF are investigated including precoding, transmission power assignment, user feedback and scheduling. Furthermore, a method to improve the system performance with OBF is proposed by utilizing historical information. The performance of NOMA with OBF is investigated by system-level simulations with very practical assumptions and parameters in order to provide insights into the suitability of combining OBF with NOMA for future radio access. Simulation results show the proposed method is effective and NOMA with OBF is a promising scheme for future wireless communication systems.

关键词： antenna arrays array signal processing diversity reception multi-access systems radio access networks radio receivers scheduling advanced receiver multiantenna techniques nonorthogonal multiple access opportunistic beamforming power domain precoding radio access spatial diversity spatial multiplexing system performance improvement transmission power assignment user feedback wireless communication systems Array signal processing Downlink Interference MIMO Multiplexing Receiving antennas Throughput array signal processing Wireless communication systems Noma user feedback octave band filter Multi access systems IZUMO1 gene space division multiplexing Receiving antennas spatial diversity Wireless networks prediction coding radio receivers diversity reception Antenna arrays

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Orthogonal Faster-Than-Nyquist Signaling using Cholesky Pre-whitening Filter

Orthogonal Faster-Than-Nyquist Signaling using Cholesky Pre-...

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International Conference on Electronics, Information and Communications (ICEIC)

作者： Hyeonguk Baek Seunghyeon Kim Changjun Lee Hojun Kim Yulong Shang Taejin Jung Chonnam National University Gwangju Republic of Korea R&D Team Network Business Samsung Electronics Suwon Republic of Korea Sch. of EIE Jiangsu University of Technology Changzhou China

ISBN: (数字)9781728162898

ISBN: (纸本)9781728162904

In this paper, a new orthogonal Faster-Than-Nyquist (FTN) signaling based on a Cholesky precoder is proposed. When using a SRRC transmit filter with a roll-off factor, the orthogonal FTN guarantees the orthogonality between all transmitted symbols with a condition of that a symbol period is larger than the 1/(1+α) times of the Nyquist rate. Due to its orthogonal property, the proposed FTN perfectly resolves the problems of higher decoding complexity and performance loss imposed in the conventional FTN.

关键词： decision feedback equalisers decoding filtering theory intersymbol interference least mean squares methods matched filters multipath channels precoding Least squares method decision feedback equalisers matched filters filtering theory Multipath channels intersymbolic interference prediction coding DEcoding Cholesky Orthogonal Nyquist rate

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Lattice-Reduction-Aided Precoding for Coded Modulation over Algebraic Signal Constellations

Lattice-Reduction-Aided Precoding for Coded Modulation over ...

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WSA 2016;20th International ITG Workshop on Smart Antennas

作者： Sebastian Stern Robert F. H. Fischer

Lattice-reduction-aided preequalization or precoding are powerful techniques for handling the interference on the multi-user MIMO broadcast channel as the channel's diversity order can be achieved. However, recent advantages in the closely related field of integer-forcing equalization raise the question, if the unimodularity constraint on the integer equalization matrix in LRA schemes is really necessary or if it can be dropped, yielding an additional factorization gain. In this paper, socalled algebraic signal constellations are presented, where the unimodularity is not required anymore. Assuming complexbaseband transmission, particularly q-ary fields of Gaussian primes (complex integer lattice) and Eisenstein primes (complex hexagonal lattice) are considered. Given the signal constellation and the channel code in the same arithmetic over a finite field of order q, a coded modulation approach with straightforward softdecision decoding metric is applied. Moreover, LRA precoding over algebraic constellations and its advantages as opposed to LRA preequalization are discussed. The theoretical considerations in the paper are covered by means of numerical simulations.

关键词： modulation coding Constellation diagram prediction coding Channel coding CONSTELLATIONS LRA pre-equalization Algebra Galois fields

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Interference Mitigation and Multiuser Multiplexing with Beam-Steering Antennas

Interference Mitigation and Multiuser Multiplexing with Beam...

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WSA 2015;19th International ITG Workshop on Smart Antennas

作者： Martin Kurras Lars Thiele Giuseppe Caire Fraunhofer - Heinrich Hertz Institute Technical University of Berlin

We revisit a recently proposed framework for "massive MIMO" named Joint Space Division and Multiplexing (JSDM), that explicitly distinguishes between long-term channel statistics and instantaneous channel state information. In JSDM, the beamforming function is split into two components: prebeamforming and multiuser precoding. The pre-beamforming stage depends only on the channel covariance information, which is (locally) time-invariant and can be acquired without significant training overhead by averaging over time. Based on this information, the pre-beamforming stage separates the users into groups without significant mutual interference, irrespectively of their instantaneous random channel realization. Then, inside each user group, a standard multiuser MIMO precoding scheme based on instantaneous channel state information can be used in order to achieve further multiuser multiplexing gain. JSDM is naturally suited to a Hybrid Digital Analog (HDA) implementation, where the pre-beamforming function can be accomplished through a reconfigurable RF front-end. In this paper, we consider a lowcomplexity HDA implementation of JSDM, where the canonical massive MIMO antenna array is replaced by a smaller number of programmable beam-steering antennas. We show by simulation that with this architecture it is possible to achieve both multiplexing gain and interference mitigation across different user groups.

关键词： Channel state information disturbance suppression User groups MULTIPLEXOR high definition audio prediction coding averaging space division

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Digital predistortion for hybrid precoding architecture in millimeter-wave massive mimo systems

Digital predistortion for hybrid precoding architecture in m...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Han Yan Danijela Cabric Electrical Engineering Department University of California Los Angeles USA

ISBN: (纸本)9781509041183

Millimeter-wave (mmWave) systems require massive antennas at both transmitter and receiver to reach desirable link budget. Analog-digital hybrid beamforming is a promising architecture since it significantly reduces the hardware cost while approaches the performance of digital beamforming. However, the nonlinear power amplifier (PA) introduces intermodulation interference and degrades the spectral efficiency. In this work, we use memory polynomial model for modelling mmWave PA and study the inter-beam and inter-symbol interference in hybrid precoding architecture. We also propose a digital predistortion (DPD) algorithm to mitigate interference. The proposed DPD reduces interference power by an order of magnitude and compared with system without predistortion, the proposed system can achieve up to 60% spectral efficiency.

关键词： Millimeter-wave phased array beamforming predistortion power amplifier Predistortion millimeter wave Beamforming phased array Power amplifiers multiple input multiple output systems spectral efficiency interference power intersymbolic interference prediction coding

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System Outage Probability Performance Analysis Based on Blind Interference Cancelation in Two-Way Relay Network

System Outage Probability Performance Analysis Based on Blin...

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International Conference on Intelligent Computing, Automation and Systems (ICICAS)

作者： Bin Jiang Xianwen He Zhizhong Li Gang Yang Naval Submarine Academy Qingdao China

ISBN: (数字)9781728161068

ISBN: (纸本)9781728161075

Additional self-interference is introduced in two-way relay network (TWRN) while spectral efficiency is increased. As for self-interference problem in amplify-and-forward (AF) modes, a kind of blind interference cancelation (BIC) scheme is employed. The scheme can realize self-interference cancellation and desired signal separation with unknown channel status information by signal precoding operating at transmitting node. In this way, the impact of residual self-interference caused by imperfect channel estimation on TWRN performance is eliminated. Based on this, the closed expression and asymptotic expression of the system outage probability (OP) under M-phase shift keying (MPSK) modulation is derived. Moreover, the influence of SOP performance with channel estimation error under different schemes is analyzed. The correctness of the theoretical derivation is verified by simulation comparison.

关键词： amplify and forward communication channel estimation error statistics interference suppression phase shift keying precoding probability relay networks (telecommunication) telecommunication network reliability channel estimation telecommunication network reliability prediction coding Phase shift keying suppression of interference Interference cancellation Probability self-interference Relay networks Error analysis channel status

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