Orthogonal Space-Time Block Codes Design using Jacket Transform for MIMO Transmission System
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Hadamard transform has played a great part in Jacket transform. Motivated by Jacket transform, we propose a simple approach for space time block codes (STBC) design by using the Hadamrd in this letter,which achieves full rate, full diversity and employs simple decoding. The orthogonal STBC may be designed easily by using the proposed approach. Especially the performance of the designed orthogonal STBC may be improved greatly.Keywords:
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A new 2timesx2 full-rate full-diversity space-time block code (STBC) is proposed that satisfies the non-vanishing determinant property and offers a reduced computational complexity as compared to the other existing full-rate codes. The performance of our new STBC is shown to be comparable to that of the best full-rate STBCs known so far. This performance is achieved at the decoding complexity which is substantially lower than that of the standard sphere decoder.
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Previous work on quasi-orthogonal space-time block code (QO-STBC) has been designed to achieve full rate and full diversity gain for four antennas. However this conventional QO-STBC scheme decoding is complex. For achieving more diversity gains, an extended QO-STBC scheme is provided to achieve full diversity with one rate for six antennas. Furthermore, by transforming the detection matrix to an orthogonal one, this novel scheme can achieve a simple linear decoding. Therefore it proposes an extended minimum decoding complexity QO-STBC (MDC-QO-STBC) for six antennas. Due to eliminate the interference from different equivalent channels, the novel extended MDC-QO-STBC scheme improves transmission reliability and linear decoding complex compared with the conventional QO-STBC scheme. At last extensive simulation results are presented to prove the theoretical analysis.
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In this paper, a class of quasi-orthogonal space-time block codes (Q-STBC) is proposed for systems with two transmit antennas and three time slots, where the Alamouti code is not applicable due to the odd time slots. The proposed Q-STBC codes achieve rate one and full diversity with low complexity maximum likelihood decoding. The Q-STBC design also shows excellent properties in other practical aspects, such as the compatibility with the single antenna transmission mode, low power fluctuation, and low receiver decoding and transmitter encoding complexity.
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In order to achieve full diversity in the MIMO wireless communication system, most of the exist OSTBC is based on the ML decoding at the receiver, and this is computationally expensive. However, the symbol rate of the OSTBC is low due to the limitation of the code structure. This paper proposes a design of high symbol rate STBC that achieves full diversity with the linear receiver which named EOAC. It is constructed by interchanging the Alamouti codes into each element of the Overlapped-Alamouti Codes (OAC). Simulation results suggest that the proposed EOAC can give a better symbol error rate (SER) performance and have higher symbol rate than the OAC.
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The schemes about orthogonal STBC codes, quasi-orthogonal STBC codes, and STBC codes using constellation rotations are introduced in this paper. Simulation results and performance comparison of these schemes are presented. In the same condition, the STBC code providing full diversity and full rate outperforms all other codes compared.
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Space-time block codes (STBCs) from orthogonal designs have attracted considerable attention due to their fast maximum-likelihood (ML) decoding and full diversity. A full rate (R=1) is achieved for 3 and 4 antennas using "triple QPSK" for complex (STBCs). This paper proposes a family of new space-time block codes (STBC) for 6 transmit antennas that achieves full rate. This paper also proposes a modified QPSK constellation scheme that can achieve the full rate for both 6 and 8 transmit antennas.
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In this letter we design a new family of space-time block codes (STBC) for multi-input multi-output (MIMO) systems. The complex orthogonal STBC achieves full diversity and full transmission rate with fast maximum-likelihood decoding when only two transmit antennas are employed. By combining the Alamouti STBC and the multidimensional signal constellation rotation based on the cyclotomic number field, we construct cyclotomic orthogonal space-time block codes (COSTBCs) which can achieve full diversity and full rate for multiple transmit antennas. Theoretical analysis and simulation results demonstrate excellent performance of the proposed codes, while the decoding complexity is further reduced.
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It is known that LTE systems do not fully support the Alamouti space-time code as the number of symbols per slot is not always an even number. Adapting to the case there is only three symbols per slot, Lei et al. proposed a class of quasi-orthogonal space time block codes (Q-STBC) for two transmit antennas and three time slots. This Q-STBC achieves some desirable properties of an STBC code such as full rate and full diversity. However, there are two drawbacks associated with it, namely, high decoding complexity due to pair-symbol maximum likelihood decoding and lack of maximum coding gain. Coping with these two issues we propose a class of STBC for three time slots and two transmit antennas with single-symbol maximum likelihood decoding. The proposed STBC also allows to achieve full-rate and full diversity. However, it is superior to Q-STBC in providing maximum coding gain while requiring lower decoding complexity.
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Abstract We present a unified construction of full‐diversity space‐time block codes (STBC) called orthogonality‐embedded space‐time (OEST) codes. Other existing STBC, including orthogonal, quasi‐orthogonal and rate‐one linear threaded algebraic space‐time (LTAST) codes, can also be derived from OEST codes. The new OEST construction is of the form ${\sum} (A_k\otimes C_k + B_k\otimes C_k^{\rm H})$ , where A k and B k are linear‐dispersion matrices of orthogonal STBC and C k s are circulant matrices. The circulant matrices encode the data vectors, which can be completely separately detected at the receiver, greatly reducing the decoding complexity. For the same number of transmit antennas, several variants of OEST codes can be constructed allowing a tradeoff among the rate, performance and decoding complexity. A new rate‐one STBC derived from OEST codes, called semi‐orthogonal algebraic space‐time codes, is shown to achieve near capacity of multi‐input single‐output channels and performs better than several existing STBC. Copyright © 2007 John Wiley & Sons, Ltd.
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Recently several STBC designs were proposed for MIMO systems with linear receivers. In this paper, we propose a new design of high-rate STBC with linear receivers. Compared to the overlapped Alamouti code (OAC) recently proposed by Shang and Xia, the new STBC has a higher symbol rate without guarantee of achieving full diversity. To achieve the same rate, the new STBC has only a half of the block length (code delay) of the OAC. Simulation results show that in comparison with some existing codes for a given rate the proposed STBC can give a better outage probability performance.
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