Precoded STBC-VBLAST for MIMO Wireless Communication Systems

Meng, Chen; Tuqan, J.

doi:10.1109/icassp.2007.366541

Cited by 14 publications

(15 citation statements)

References 10 publications

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“…They take advantage of the structure of the system equation to use ordered successive interference cancellation (OSIC) decoding, which means they retain the simplicity of VBLAST. One possible approach, known as hybrid coding [3,2,7,13,8], consists in the selection of some of the available transmit antennas to work in STBC mode, while the remaining ones operate as V-BLAST. In [3], we proposed a hybrid scheme called ZF-SQRD-LQOSTBC.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Detector for STBC-VBLAST Space-Time Code for MIMO Wireless Communications

Cortez

Bazdresch

Garcia

et al. 2009

2009 Electronics, Robotics and Automotive Mechanics Conference (CERMA)

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Hybrid MIMO communication systems are defined as a combination of architectures designed to achieve both multiplexing gain (such as VBLAST), and diversity gain, (such as STBC) such that transmission schemes that have both high spectral efficiency and link reliability can be developed. In this paper we introduce a new way to represent hybrid systems, in which the detection process is carried out in a unified manner for both spatial and diversity transmitted symbols, using an OSIC algorithm, but symbol by symbol, just as single VBLAST systems performs. In this paper we present an efficient and low-complexity, ordered, successive interference cancellation receiver based on sorted QR decomposition for the hybrid STBC-VBLAST transmission scheme. We show how the use of our detection scheme proposal outperforms other recent hybrid detection schemes in terms of bit error rate, even when there is precoding at the transmitter. We also show our proposal has lower complexity, achieved by exploiting the structure of the linear dispersion matrices. 1

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Section: Introductionmentioning

confidence: 99%

An Efficient Detector for STBC-VBLAST Space-Time Code for MIMO Wireless Communications

Cortez

Bazdresch

Garcia

et al. 2009

2009 Electronics, Robotics and Automotive Mechanics Conference (CERMA)

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“…For more than two antennas, the maximum possible code rate is 3/4 [11], thus Alamouti's STBC could not satisfy the demand of the desired high system capacity in real time system with good quality of service (QoS) [12,13]. Therefore, in order to achieve spatial multiplexing and diversity gains simultaneously, the hybrid MIMO system has been introduced [14][15][16]. One of the hybrid MIMO systems is V-BLAST/STBC scheme.…”

Section: Introductionmentioning

confidence: 99%

A low computational complexity V-BLAST/STBC detection mechanism in MIMO system

Chong

Noordin

et al. 2014

Hum. Cent. Comput. Inf. Sci.

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The idea of multiple antenna arrays has evolved into multiple-input multiple-output (MIMO) system, which provides transmit and receive diversities. It increases robustness of the effect of multipath fading in wireless channels, besides yielding higher capacity, spectral efficiency and better bit error rate (BER) performance. The spatial diversity gain is obtained by transmitting or receiving multiple copies of a signal through different antennas to combat fading and improves the system BER performance. However, the computational complexity of MIMO system is inevitably increased. Space-time coding (STC) technique such as Alamouti's space-time block code (STBC) that combines coding, modulation and signal processing has been used to achieve spatial diversity. Vertical Bell Laboratories Layered Space-Time (V-BLAST) uses antenna arrays at both the transmitter and receiver to achieve spatial multiplexing gain. Independent data streams that share both frequency bands and time slots are transmitted from multiple antennas and jointly detected at the receiver. The theoretical capacity of V-BLAST increases linearly with the number of antennas in rich scattering environments. It's well-known that maximization of spatial diversity gain leads to degradation of spatial multiplexing gain or vice versa. In order to achieve spatial multiplexing and diversity gains simultaneously, the V-BLAST/STBC scheme has been introduced. This hybrid scheme increases MIMO system capacity and maintains reliable BER performance at the same time. However, both V-BLAST and STBC layers, in this hybid scheme, assume each other as an interferer. Thus, the symbols must be decoded with a suitable detection mechanism. In this paper, a new low complexity detection mechanism for V-BLAST/ STBC scheme based on QR decomposition, denoted as low complexity QR (LC-QR) decomposition, is presented. The performance of the proposed LC-QR decomposition detection mechanism in V-BLAST/STBC transceiver scheme is compared with other detection mechanisms such as ZF, MMSE and QR decomposition. It is shown that the BER performance in V-BLAST/STBC scheme is better than V-BLAST scheme while its system capacity is higher than orthogonal STBC scheme when the LC-QR decomposition detection mechanism is exploited. Moreover, the computational complexity of proposed LC-QR decomposition mechanism is significantly lower than other abovementioned detection mechanisms.

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“…The purposes of MIMO systems implementation are various: we can obtain either a diversity gain to combat signal fading or we can obtain a capacity gain. Generally, there are three types of MIMO receivers as presented in [15].The first improves the power efficiency by maximizing spatial diversity. The second is used to increase the capacity.…”

Section: Mimo-ofdm Transmission Schemesmentioning

confidence: 99%