A design of enhanced space time block codes in MIMO wireless systems
1
Citation
6
Reference
10
Related Paper
Citation Trend
Abstract:
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.Keywords:
Space–time block code
Symbol (formal)
Code (set theory)
Full Rate
Diversity gain
Symbol rate
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.
Space–time block code
Full Rate
Code (set theory)
Cite
Citations (64)
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.
Space–time block code
Full Rate
Diversity gain
Transmit diversity
Code (set theory)
Cite
Citations (0)
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.
Space–time block code
Full Rate
Transmit diversity
Cite
Citations (37)
The main objective of a Cooperative Multiple-Input Multiple-Output (CMIMO) system is to improve network throughput and network coverage and save energy. By grouping wireless devices as virtual multi-antenna nodes, it can thus simulate the functions of multi-antenna systems. A Space-Time Block Code (STBC) was proposed to utilize the spatial diversity of MIMO systems to improve the diversity gain and coding gain. In this paper, we proposed a cooperative strategy based on STBC and CMIMO, which is referred to as Space-Time Block Coded Cooperative Multiple-Input Multiple-Output (STBC-CMIMO) to inherit the advantages from both STBC and CMIMO. The theoretical performance analysis for the proposed STBC-CMIMO is presented. The performance advantages of the STBC-CMIMO are also shown by simulations. In the simulations, it is demonstrated that STBC-CMIMO can obtain significant performance compared with the existing CMIMO system.
Space–time block code
Diversity gain
Antenna diversity
Transmit diversity
Coding gain
Cooperative Diversity
Cite
Citations (17)
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.
Space–time block code
Full Rate
Code (set theory)
Transmit diversity
Cite
Citations (1)
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.
Space–time block code
Full Rate
Diversity gain
Transmit diversity
Cite
Citations (1)
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.
Space–time block code
Coding gain
Full Rate
Transmit diversity
Diversity gain
Cite
Citations (1)
Recently, various space-time block coding (STBC) schemes have been developed to take advantage of the MIMO communication channel. The code designs using the pair-wise error probability of the maximum likelihood (ML) detector are based mainly on the rank and the determinant criteria. In particular, the current STBC designs focus on full diversity and the non-vanishing determinant, since such codes enable the optimal tradeoff of diversity and multiplexing gains. In this paper, we consider a coherent communication system equipped with multiple transmitter antennas and a single receiver antenna, i.e., a MISO system. For such systems, Afarkhani, Tirkkonen-Boariu-Hottinen, and Papadias-Foschini proposed the quasi-orthogonal STBC designs with fast ML decoding. Su and Xia designed the rotated quasi-orthogonal STBCs enabling full diversity and optimal coding gain. However, the nearest neighbor number per symbol for this code tends to infinity when the size of constellation is large. Here, we explore a novel criterion to design rotated quasi-orthogonal STBCs. In addition to both maximizing the rank and the coding gain, our design attempts to make the average number of the nearest neighbors as small as possible.
Space–time block code
Coding gain
Diversity gain
Transmit diversity
Cite
Citations (3)
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.
Space–time block code
Orthogonality
Full Rate
Cite
Citations (4)
In this paper, new space time/frequency block coding (STBC/SFBC) scheme with angle feedback for 4-transmit antennas is proposed. This scheme achieves the full diversity gain with the full code rate by rotating constellation symbols in STBC/SFBC codewords using the quasi-orthogonal structure. With multiple receive antennas, this scheme can also be applied with additional receive antenna diversity. We show the channel characteristics can be much improved with as small as 1-bit feedback overhead. Simulation shows that the proposed scheme with 1-bit feedback achieves near-optimum performance.
Space–time block code
Diversity gain
Transmit diversity
Coding gain
Antenna diversity
Full Rate
Code (set theory)
Cite
Citations (15)