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Comprehensive study on a 2 × 2 full-rate and linear decoding complexity space-time block code
, Article IET Communications ; Volume 9, Issue 1 , 2015 , Pages 122-132 ; 17518628 (ISSN) ; Talebi, S ; Abouei, J ; Sharif University of Technology
Institution of Engineering and Technology
2015
Abstract
This paper presents a comprehensive study on the Full-Rate and Linear-Receiver (FRLR) STBC proposed as a newly coding scheme with the low decoding complexity for a 2×2 MIMO system. It is shown that the FRLR code suffers from the lack of the non-vanishing determinant (NVD) property that is a key parameter in designing a full-rate STBC with a good performance in higher data rates, across QAM constellation. To overcome this drawback, we show that the existence of the NVD feature for the FRLR code depends on the type of the modulation. In particular, it is analytically proved that the FRLR code fulfills the NVD property across the PAM constellation but not for the QAM scheme. Simulation results...
Using orthogonal designs with feedback in wireless relay networks
, Article 2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2008, Recife, 6 July 2008 through 9 July 2008 ; October , 2008 , Pages 61-65 ; Hossein Khalaj, B ; Gershman, A. B ; Sharif University of Technology
2008
Abstract
Recently, distributed space-time coding over half duplex wireless relay networks has been proposed to achieve higher diversity at the receiver. The use of orthogonal and quasi-orthogonal designs in such relay networks has the advantage of providing maximum diversity at a low decoding complexity. However, similar to their originating space-time codes, these designs are restricted in terms of rate and number of relays. In order to alleviate such restrictions, we propose an extension of group-coherent codes (GCCs) to wireless relay networks. As will be shown, with a very limited amount of feedback from receiver to the relays, it is possible to achieve a distributed code that is applicable for...