A Study on Design Method of Integer Codes for Providing Good Transmit Diversity

摘要

Integer space-time block codes (ICs) for multiple-input multiple-output (MIMO) channels feature the computation of only rational coefficients in the encoding operation, and show a low peak-to-average power ratio. Recently, we have proposed 2×2 ICs with various spectral efficiencies. However, a fast decoding method of the proposed ICs has not been proposed yet. Therefore, in this study, we consider a design method of a 2 × 1 IC for providing transmit diversity. The 2 × 1 IC can reduce the ML decoding complexity to the same order of orthgonal space-time codes such as the Alamouti code, because the 2 × 1 IC is decodable by every symbol. In addition, we evaluate the error performance of the transmit diversity system using two or three sets of the proposed ICs in parallel.