Abstract
We propose a concatenated trellis code (TC) and coordinate interleaved differential space-time block code (STBC) for OFDM. The coordinate interleaver, provides signal space diversity and improves the codeword error rate (CER) performance of the system in wideband channels. Coordinate interleaved differential space-time block codes are proposed and used in the concatenated scheme, TC design criteria are derived, and the CER performances of the proposed system are compared with existing concatenated TC and differential STBC. The comparison showed that the proposed scheme has superior diversity gain and improved CER performance.
Highlights
In recent years, code design for multiple-input multipleoutput (MIMO) channels, with orthogonal frequency division multiplexing (OFDM) modulation, has gained much attention in wireless communications
To clarify the effect of interleaver selection on the diversity gain of TC-STBC, we extend the results given in [2, 3] where the EURASIP Journal on Wireless Communications and Networking two-symbol interleaver is considered between TC and STBC, to the symbol interleaver case
The encoder block diagram of the proposed differential TC-CIOD OFDM for two transmit antennas is shown in Figure 1, where the source bits are trellis encoded at rate 2/3 and mapped to 8-PSK signal constellation
Summary
Code design for multiple-input multipleoutput (MIMO) channels, with orthogonal frequency division multiplexing (OFDM) modulation, has gained much attention in wireless communications. Space-time block codes (STBC) first proposed by Alamouti [1] provide full spatial diversity in wireless channels, with simple linear maximum likelihood (ML) decoders. Coordinate interleaved signal sets provide signal space diversity and improve the symbol error performance of communication systems in fast fading channels. The recent application of coordinate interleaving to MIMO-OFDM which shows that this technique provides considerable diversity gain without significant increase of encoding and decoding complexities was proposed by Rao et al [6]. We apply the nonconstant modulus (nonCM) differential space-time block (STB) encoding scheme proposed by Hwang et al [8] to CIOD, and use it in TCCIOD scheme [5]. The proposed differential scheme achieves full spatial and multipath diversities, and provides considerable coding gain advantage without channel state information (CSI). To clarify the effect of interleaver selection on the diversity gain of TC-STBC, we extend the results given in [2, 3] where the EURASIP Journal on Wireless Communications and Networking two-symbol interleaver is considered between TC and STBC, to the symbol interleaver case
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