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Sphere decoding (SD) is an efficient algorithm which has been proposed in Multiple-input Multiple-output(MIMO) digital communications. Sphere decoding can avoids to search for the element like maximum-likelihood (ML) decoder thus reduces the decoding order of complexity effectively. However, SD also has high complexity in some situations. The complexity of the algorithm are controlled by radius and...
This paper proposes a full-rate, full-diversity space-time block code (STBC) with low maximum likelihood (ML) decoding complexity and high coding gain for the 4 transmit antenna, 2 receive antenna (4 times 2) multiple-input multiple-output (MIMO) system that employs 4/16-QAM. For such a system, the best code known is the DjABBA code and recently, Biglieri, Hong and Viterbo have proposed another STBC...
In this paper, we propose a new full-rate, full-diversity STBC for the quasi-static Rayleigh flat fading 2times2 MIMO channel. This code has an ML-decoding complexity of the order of M3. For square QAM, the ML-decoding complexity is of the order of M2radic2. and also matches the Golden code in coding gain for 4- and -16 QAM constellations, and have the non-vanishing determinant (NVD) property for...
This paper presents a low-ML-decoding-complexity, full-rate, full-diversity space-time block code (STBC) for a 2 transmit antenna, 2 receive antenna multiple-input multiple- output (MIMO) system, with coding gain equal to that of the best and well known Golden code for any QAM constellation. Recently, two codes have been proposed (by Paredes, Gershman and Alkhansari and by Sezginer and Sari), which...
MIMO-OFDM receivers with horizontal encoding are considered in this paper. The successive interference cancellation (SIC) algorithm is compared to the K-best list sphere detector (LSD). A modification to the K-best LSD algorithm is introduced. The SIC and K-best LSD receivers are designed for a 2 times 2 antenna system with 64-quadrature amplitude modulation (QAM). The ASIC implementation results...
This paper applies the sigma mapping of M-QAM in linear diversity-embedded space-time block codes (LDE-STBC) to achieve different diversity levels and various coding gains for unequal error protection (UEP). By controlling the basis vectors of sigma mapping, the bit error rate (BER) performance of each bit in a layer can be made to satisfy its quality-of-service (QoS) requirement. Moreover, with the...
In this paper, we propose a decoding approach for quasi-orthogonal space-time block code (QO-STBC) based on array processing. This approach works with single symbol and can deduce delay generated by the decoder as well as the decoding computational load. In this scheme, signals transmitted via different antennas are separated by null space, and then they are decoded linearly. Numerical results show...
Li and Xia have recently investigated the design of space-time codes that achieve full spatial diversity for asynchronous cooperative communications. They show that certain of the binary space-time trellis codes derived from the Hammons-El Gamal stacking construction are delay tolerant and can be used in the multilevel code constructions by Lu and Kumar to produce delay tolerant space-time codes for...
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