Full-rate full-diversity space-frequency codes with optimum coding advantage

Abstract

Abstract-In this paper, a general space-frequency (SF) block code structure is proposed that can guarantee full-rate (one channel symbol per subcarrier) and full-diversity transmission in multiple-input multiple-output-orthogonal frequency-division multiplexing (MIMO-OFDM) systems. The proposed method can be used to construct SF codes for an arbitrary number of transmit antennas, any memoryless modulation and arbitrary power-delay profiles. Moreover, assuming that the power-delay profile is known at the transmitter, we devise an interleaving method to maximize the overall performance of the code. We show that the diversity product can be decomposed as the product of the "intrinsic" diversity product, which depends only on the used signal constellation and the code design, and the "extrinsic" diversity product, which depends only on the applied interleaving method and the power delay profile of the channel. Based on this decomposition, we propose an interleaving strategy to maximize the "extrinsic" diversity product. Extensive simulation results show that the proposed SF codes outperform the previously existing codes by about 3-5 dB, and that the proposed interleaving method results in about 1-3-dB performance improvement compared to random interleaving.Index Terms-Frequency-selective fading channels, full diversity, multiple-input multiple-output-orthogonal frequency-division multiplexing (MIMO-OFDM) systems, permutation, spacefrequency (SF) coding.

Construction and Analysis of Quaternion MIMO-OFDM Communications Systems

“…For a better description of this modulation technique, it is useful to decompose the matrix X m = diag{X m } into its even and odd components using the following notation X e m , X o m . By doing the same for X (1) m and X (2) m , we obtain X Other SF codes proposed in the literature guarantee full-rate and full-diversity transmission in MIMO-OFDM systems [18]. III.…”

“…The ρ/M t term is used for adjusting the signal-to-noise ratio at a receive antenna to be independent of the number of transmit antennas [18]. The channel H is defined as…”

BER Analysis of Space-Frequency Block Coded MIMO-OFDM Systems Using Different Equalizers in Quasi-Static Mobile Radio Channel

“…It also requires knowledge of statistical distribution of the noise, which determines the form of metric for optimum demodulation of the received signal. Maximum likelihood (ML) decoding [18,19] finds the codeword C that solves the following minimization problem C argmin r C ′ H F (21) Where . H is a Hermition operator which means transpose and then conjugate of a matrix.…”

Tensor space/time coding for MIMO wireless communication systems

“…The combination of ST, SF or STF codes and multiplexing access techniques in the MIMO systems has received much attention in the last years. In the MIMO-OFDM system, SF and STF codings have been employed for providing high data rates and/or reliability through the system diversities available [25,28,32,34,35,36,37,38,39]. For the same purpose, the MIMO-CDMA and MIMO-SDMA systems have exploited the ST diversities [40,41,42,17,43,12,44].…”