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Some further results on blind identification of MIMO FIR channels via second-order statistics

SIGNAL PROCESSING 2007年第6期87卷 1434-1447页

作者： Fang, Jun Leyman, A. Rahim Chew, Yong Huat Duan, Huiping Natl Univ Singapore Dept Elect & Comp Engn Singapore 119260 Singapore ASTAR Inst Infocomm Res Singapore 119613 Singapore Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

In this paper, we consider the problem of blind multiple-input multiple-output (MIMO) finite impulse response (FIR) channel identification driven by spatially correlated signals. The second-order statistics (SOS) of the input sources are assumed known a priori. It is shown that under certain specified conditions, the MIMO FIR channel can be completely identified using the second-order statistics of the channel output. A SOS-based method is proposed and the proof for the uniqueness of the system solution is provided. As a special case, our proposed method can still entirely identify the MIMO channel even if the input source signals are spatially and temporally uncorrelated, given that the channel orders corresponding to each pair of users are different from each other. Extensive numerical simulation results are included to illustrate the performance of the proposed algorithm. (c) 2007 Elsevier B.V. All rights reserved.

关键词： blind channel estimation spatially correlated sources multiple-input multiple-output systems

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Channel correlation relied grouped spatial modulation for massive MIMO systems

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IET COMMUNICATIONS 2020年第8期14卷 1241-1250页

作者： Zuo, Xingxuan Zhang, Jiankang Mu, Xiaomin Yang, Lie-Liang Zhengzhou Univ Sch Informat Engn Zhengzhou 450001 Henan Peoples R China Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

Massive multiple-input multiple-output (MIMO) systems with hundreds of correlated antennas at base station are capable of offering abundant spatial resources. When spatial-domain modulation is applied to these systems, the spatial modulation (SM) using only one radiofrequency chain benefits practical implementation, but suffers from significantly reduced multiplexing gain offered by the massive number of antennas. By contrast, the generalised SM (GSM) allows to simultaneously activate multiple transmit antennas, which improves spatial multiplexing gain, but degrades the achievable error performance, as its design pays no attention to the antenna correlation. The authors propose an antenna grouped SM (GrSM) scheme, which is capable of circumventing the shortcomings of both the SM and GSM schemes suffered in massive MIMO scenarios. In the proposed GrSM scheme, transmit antennas are partitioned into multiple groups, where the relatively strongly correlated antennas within individual groups are used to implement component SM schemes, while the relatively weakly correlated antennas in different groups are beneficial to obtain multiplexing gain. In order to further improve the spectral efficiency, adaptive modulation is integrated with GrSM to form the adaptive GrSM (AGrSM). The achievable error and spectral efficiency performance of GrSM and AGrSM systems are investigated based on both mathematical analysis and Monte-Carlo simulations, which are also compared with that of the conventional SM and GSM schemes, when massive MIMO communication scenarios are considered. Their studies and performance results show that GrSM is a promising transmit scheme for massive MIMO, which can outperform both the SM and GSM schemes.

关键词： MIMO communication transmitting antennas multiplexing Monte Carlo methods adaptive modulation mathematical analysis antenna arrays wireless channels channel correlation spatial modulation massive MIMO systems multiple-input multiple-output systems base station abundant spatial resources spatial-domain modulation radiofrequency chain benefits practical implementation reduced multiplexing gain generalised SM multiple transmit antennas spatial multiplexing gain achievable error performance antenna correlation SM scheme GSM schemes massive MIMO scenarios GrSM scheme relatively strongly correlated antennas individual groups component SM schemes relatively weakly correlated antennas adaptive modulation adaptive GrSM spectral efficiency performance AGrSM systems conventional SM massive MIMO communication scenarios promising transmit scheme

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Performance bounds of space-time block coding in Rician and log-normal fading channels

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IET COMMUNICATIONS 2007年第1期1卷 86-91页

作者： Papadopoulos, G. D. Karagiannidis, G. K. Pavlidou, F. N. Aristotle Univ Thessaloniki Dept Elect & Comp Engn Div Telecommun GR-54124 Thessaloniki Greece

Analytical expressions concerning the capacity and bit error rate (BER) of multiple-input multiple-output systems with space-time block coding (STBC) are derived. Two fading environments are examined, log-normal and Rician channels. A tight closed-form upper bound is presented for the BER of systems operating in log-normal fading environments in addition to an upper bound for the capacity of this type of systems. The latter bound applies to systems that operate under Rician fading as well. The analytical results were validated against ample numerical simulations for three STBC schemes and three phase-shift-keying modulations. The proposed bounds proved to. be a tractable way to evaluate the system performance when no closed-form expression for the probability density function or the moment generating function is known.

关键词： block codes closed-form upper bound Rician channels capacity probability density function MIMO communication BER phase shift keying log-normal fading channels log normal distribution channel capacity space-time block coding STBC scheme Rician channels error statistics channel coding phase-shift-keying modulations bit error rate moment generating function multiple-input multiple-output systems space-time codes

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Amplitude and frequency control of a vibratory pile driver

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 2000年第3期47卷 623-631页

作者： Bingham, CM Stone, DA Schofield, N Howe, D Peel, D Univ Sheffield Dept Elect & Elect Engn Sheffield S1 3JD S Yorkshire England

This paper describes the digital control of a vibratory pile driver in which the vibration is generated via two tandem pairs of electrically driven, geared, contra-rotating eccentrics. Experimental results are included to show the controller-induced system dynamics for a variety of load conditions, and to highlight the fact that, if the relative phase of the eccentric pairs is not controlled, the natural tendency at high excitation frequency is for the pile driver to operate with a low vibration amplitude. An analytical technique for identifying the system parameters is presented, and analytical performance predictions are compared with experimental results. Analysis of the power flow in the system shows that, although significant power transfer occurs between the two electrical drives, the net power dissipation during pile driving is relatively low.

关键词： brushless rotating machines digital control load-flow analysis multiple-input multiple-output systems system modeling vibration control

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Two-dimensional sorting algorithm for high-throughput K-best MIMO detection

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IET COMMUNICATIONS 2017年第6期11卷 817-822页

作者： Fan, Wen Alimohammad, Amir San Diego State Univ 5500 Campanile Dr MC 1309 San Diego CA 92182 USA

This brief presents a novel two-dimensional parallel sorting algorithm for high-throughput K-best detectors utilised in multiple-input multiple-output (MIMO) systems. The proposed sorting algorithm enhances the throughput by sorting a data set in parallel and avoids the relatively long latency of the traditional algorithms. This is especially important in MIMO systems utilising high-order modulation schemes. The authors used the sorting algorithm in a K-best detector with variable K values at different layers of the search tree, which improves the bit error rate performance and reduces the computational complexity significantly. The detector using the sorting algorithm is designed and implemented in TSMC 90-nm CMOS technology for 4 x 4 64-QAM MIMO systems. Operating at 200MHz, the detector's throughput is 1.2Gbps. Its equivalent gate count is 182K.

关键词： MIMO communication quadrature amplitude modulation CMOS integrated circuits error statistics tree searching high-throughput K-best MIMO detection novel two-dimensional parallel sorting algorithm multiple-input multiple-output systems high-order modulation schemes search tree bit error rate performance computational complexity TSMC CMOS technology QAM MIMO systems frequency 200 MHz size 90 nm bit rate 1 2 Gbit s

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MIMO FSO communication using subcarrier intensity modulation over double generalized gamma fading

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OPTICS COMMUNICATIONS 2017年第0期382卷 64-72页

作者： Yi, Xiang Yao, Mingwu Wang, Xiaoyang Xidian Univ Sch Telecommun Engn State Key Lab Integrated Serv Networks Xian 710071 Peoples R China

Atmospheric turbulence-induced fading is known to have a serious detrimental effect on the performance of free-space optical (FSO) communication. The involvement of multiple lasers and photo detectors in FSO systems offers an effective way to overcome fading. Very recently, a new generic fading model, called double-generalized gamma (double GG), is developed for accurately describing irradiance fading over a wide range of turbulence conditions. Therefore, for a general and exact study of the multiple-input multiple-output (MIMO) FSO system, the double GG fading model is adopted in this paper. We investigate the MIMO FSO systems using subcarrier intensity modulation. Two typical transmit diversity schemes, repetition code (RC) and orthogonal space-time block code (OSTBC), are considered. We first propose a new power series expression for the probability density function of the double GG fading. Then we derive the average error rate expressions for both schemes in terms of double power series. The truncated forms of the derived power series enable the rapid and accurate numerical computation of the error rates. Furthermore, we present the asymptotic error rate analyses at high electrical signal-to-noise ratio (SNR) for both schemes. Closed-form diversity order and coding gain for both schemes are also obtained. Our numerical results, verified by simulation, confirm that RC outperforms OSTBC for MIMO FSO systems with subcarrier intensity modulation in double GG fading. The asymptotic coding gain of the RC scheme over the OSTBC scheme is analytically quantified for varying degrees of the fading strength. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Double generalized gamma distribution Free-space optical communication multiple-input multiple-output systems Subcarrier Intensity Modulation

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MIMO capacity of antenna arrays evaluated using radio channel measurements, reverberation chamber and radiation patterns

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IET MICROWAVES ANTENNAS & PROPAGATION 2007年第6期1卷 1160-1169页

作者： Garcia-Garcia, L. Lindmark, B. Jalden, N. Orlenius, C. Univ Politecn Madrid Dept SSR E-28040 Madrid Spain KTH Sch Elect Engn Stockholm Sweden Chalmers Univ Technol Dept Electromagnet S-41296 Gothenburg Sweden Bluetest AB S-41296 Gothenburg Sweden

We compare different methods of evaluating arrays for multiple-input multiple-output (MIMO) systems through calculation of the MIMO capacity of a compact antenna array for mobile or WLAN applications at 1766 MHz and comparing it to a reference array of four mono-poles. Three different methods were used: evaluation using radiation patterns and a channel model, measurements in a reverberation chamber and simultaneous measurement of radio channel data using the two arrays. We conclude that all methods give very similar relative results and that the main difference in the two arrays is the 1.3 dB lower radiation efficiency of the compact array. The channel measurements also show that the arrays provide between 80% and 90% of the capacity of a 4 x 4 MIMO system.

关键词： multiple-input multiple-output systems antenna radiation patterns radio channel measurement MIMO capacity radiation patterns Radio links and equipment UHF antennas reverberation chamber wireless channels antenna arrays radio channel data frequency 1766 MHz Antenna arrays MIMO communication

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Closed-loop MIMO architecture based on water-filling

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ELECTRONICS LETTERS 2002年第25期38卷 1718-1720页

作者： Dai, L Zhou, SD Zhuang, HR Yao, Y Tsinghua Univ Dept Elect Engn State Key Lab Microwave & Digital Commun Beijing 100084 Peoples R China

A novel closed-loop MIMO architecture is proposed, in which channel state information is fully utilised to maximise channel capacity. Simulation results show that compared with V-BLAST, it can achieve much better performance while maintaining the same high spectral efficiency. Nearly 5 dB gain can be provided by this new architecture over V-BLAST.

关键词： channel capacity maximization MIMO systems multiple-input multiple-output systems closed loop systems closed-loop architecture spectral efficiency channel state information simulation results channel capacity Information theory V-BLAST information theory MIMO architecture water-filling

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Transmit and Receive Antenna Port Selection for Channel Capacity Maximization in Fluid-MIMO systems

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IEEE WIRELESS COMMUNICATIONS LETTERS 2024年第11期13卷 3202-3206页

作者： Efrem, Christos N. Krikidis, Ioannis Univ Cyprus Dept Elect & Comp Engn CY-1678 Nicosia Cyprus

In this letter, we study a discrete optimization problem, namely, the maximization of channel capacity in fluid multiple-input multiple-output (fluid-MIMO) systems through the selection of antenna ports/positions at both the transmitter and the receiver. First, we present a new joint convex relaxation (JCR) problem by using an upper bound on the channel capacity and exploiting the binary nature of optimization variables. Then, we develop and analyze two optimization algorithms with different performance-complexity tradeoffs. The first algorithm is based on JCR and reduced exhaustive search (JCR&RES), while the second on JCR and alternating optimization (JCR&AO).

关键词： Receiving antennas Transmitting antennas Antennas Channel capacity Optimization Fluids Signal to noise ratio Fluid/movable antennas multiple-input multiple-output systems antenna port selection channel capacity discrete optimization convex relaxation

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Multi-user downlink beamforming with multiple transmit and receive antennas

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ELECTRONICS LETTERS 2002年第25期38卷 1725-1726页

作者： Rim, M Dongguk Univ Dept Informat & Commun Engn Seoul South Korea

Downlink multiple-input, multiple-output (MIMO) systems assuming a large number of base station antennas, a small number of mobile station antennas, and rich-scattering, quasi-stationary, and flat-fading channel environments are considered. A MIMO space-division multiple access (SDMA) technique is proposed which enables concurrent transmission of multiple data streams to each multiple mobile station. The proposed method can achieve much higher downlink channel capacity than conventional MIMO techniques.

关键词： space-division multiple access SDMA mobile station antennas quasi-stationary channel environments multiple access communication Mobile radio systems transmitting antennas multiuser channels multiple-input multiple-output systems cellular radio multiple data streams channel capacity receiving antennas space division multiple access flat-fading channel environments multiple transmit/receive antennas MIMO systems base station antennas fading channels rich-scattering channel environments multiuser downlink beamforming

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