Space-time coding for broadband wireless communications

Liu, Z.; Giannakis, Georgios B.; Zhou, Shengli; Muquet, B.

doi:10.1002/1530-8677(200101/03)1:1<35::aid-wcm4>3.0.co;2-5

Cited by 95 publications

(80 citation statements)

References 29 publications

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“…Md.Mejabaul Haquel at all [3] Analyzed the performance of two transmit antennas with more receive antennas is much better than that of the system with two transmit antenna and less receive antennas in term of BER due to the more diversity gain of Alamouti's code. V.Tarokh, Z.Liu at all [4] and [5] mentioned how data is coded through space and time to improve the reliability of the transmission, as redundant copies of the original data are sent over independent fading channels. Whereas this paper discusses how Space Time Block Codes are used to reduce BER…”

Section: Bmentioning

confidence: 99%

A Transmit Diversity Technique for OFDM System

Thota¹,

Rani²,

Kagitha³

et al. 2015

International Journal of Innovative Research in Electrical, Ele

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Abstract:In current 4G systems growing demand of multimedia services and the growth of internet related contents lead to increasing interest to high speed communications. One indispensable problem of the wireless channel is fading, which can be mitigated by diversity. There are various coding methods to achieve high reliability for Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems earlier. Recently, Space Time Block Codes (STBC) have gained much attention as an effective transmit diversity technique to provide reliable transmission with high peak data rates to increase the speed and performance of wireless communication systems. This paper presents the performance evaluation of OFDM system, in which fading is reduced by using diversity techniques along with coding methods under various fading channels such as Rician and Rayleigh fading channels. In this work, a performance criterion such as Bit Error Rate (BER) for low Signal to Noise Ratio (SNR) ranging from 10dB to 20dB is analyzed. The BER for OFDM system without including STBC is 1.776x10 -3 and including STBC is 1.621x10 -3 over Rician Channel. Whereas, over Rayleigh channel the BER for OFDM system without including STBC is 1.834x10 -5 and including STBC, it is reduced to 6.345x10 -6 for the same SNR of 14dB. Thus, OFDM system with STBC provide high data rate with good reliability.

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Section: Bmentioning

confidence: 99%

A Transmit Diversity Technique for OFDM System

Thota¹,

Rani²,

Kagitha³

et al. 2015

International Journal of Innovative Research in Electrical, Ele

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“…Unlike the traditional approach of performing ST encoding at the symbol level (see, e.g., [12] and [13]), we perform ST encoding at the block level (see also Fig. 1); this was also done in, e.g., [15], [16], and [22]. Following the TR-STBC approach for single-user point-to-point SCBT [16], we apply the TR-STBC approach to SCBT-DS-CDMA.…”

Section: A Transmitter Designmentioning

confidence: 99%

“…In the presence of noise, we have to solve the corresponding LS minimization problem, which we denote for convenience as (22) where we consider consecutive symbol block instants , corresponding to a burst length of data symbols per user. Two distinct ways exist to solve this minimization problem.…”

Section: Practical Equalizer Designmentioning

confidence: 99%

Space-time block coding for single-carrier block transmission DS-CDMA downlink

Petré

Leus

Deneire

et al. 2003

IEEE J. Select. Areas Commun.

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Abstract-The combination of space-time block coding (STBC) and direct-sequence code-division multiple access (DS-CDMA) has the potential to increase the performance of multiple users in a cellular network. However, if not carefully designed, the resulting transmission scheme suffers from increased multiuser interference (MUI), which dramatically deteriorates the performance. To tackle this MUI problem in the downlink, we combine two specific DS-CDMA and STBC techniques, namely single-carrier block transmission (SCBT) DS-CDMA and time-reversal STBC. The resulting transmission scheme allows for deterministic maximum-likelihood (ML) user separation through low-complexity code-matched filtering, as well as deterministic ML transmit stream separation through linear processing. Moreover, it can achieve maximum diversity gains of ( + 1) for every user in the system, irrespective of the system load, where is the number of transmit antennas, the number of receive antennas, and the order of the underlying multipath channels. In addition, it turns out that a low-complexity linear receiver based on frequency-domain equalization comes close to extracting the full diversity in reduced, as well as full load settings. In this perspective, we also develop two (recursive) least squares methods for direct equalizer design. Simulation results demonstrate the outstanding performance of the proposed transceiver compared to competing alternatives.Index Terms-Block transmission, direct-sequence code-division multiple access (DS-CDMA), equalizer design, frequency-selective fading channels, multiple-input-multiple-output (MIMO), space-time block coding (STBC).

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“…Many of these techniques have focused on the special structure of the so-called space-time block codes (STBC) described in [1], [2], [3], or generalizations thereof. Examples of methods that exploit STBC for blind and semiblind channel estimation include [4], [5], [6], [7]. Subspacebased approaches have been presented for modulation-induced coding in [8], [9], [10] and for circulant codes in [11].…”

Section: Introductionmentioning

confidence: 99%

“…The ambiguity can be resolved by the insertion of pilot symbols in the data, as was done in [4]. Another approach of course is to appropriately modify the structure of the space-time code, as done for example in [5], where a different linear precoder is used for even and odd symbols. The resulting modification of` would then lead to a non-degenerate…”

Section: Introductionmentioning

confidence: 99%

Closed-form blind and semi-blind estimation of linear receivers for space-time coding

Swindlehurst

2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333)

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Abstract-This paper exploits a special class of space-time codes in which linearly transformed versions of a given data sequence are transmitted from multiple antennas. Several recently proposed codes, including space-time block codes, are members of this class. The redundancy introduced by the transformations imposes structure on the received data that under certain conditions can be exploited for direct blind (and semi-blind) estimation of a linear zero-forcing receiver that recovers the original data sequence. If the transmitted symbols are constant modulus, the space-time code structure can be exploited by the Analytic Constant Modulus (ACM) algorithm to simplify the separation of multiple co-channel users. If each user employs a different code or only one user is present, the ACM joint diagonalization step can be eliminated even though multiple constant modulus data streams are received.

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Space-time coding for broadband wireless communications

Cited by 95 publications

References 29 publications

A Transmit Diversity Technique for OFDM System

A Transmit Diversity Technique for OFDM System

Space-time block coding for single-carrier block transmission DS-CDMA downlink

Closed-form blind and semi-blind estimation of linear receivers for space-time coding

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