Abstract
A design method for recursive space-time trellis codes and parallel-concatenated space-time turbo coded modulation is proposed that can be applied to an arbitrary existing space-time trellis code. The method enables a large, systematic increase in coding gain while preserving the maximum transmit diversity gain and bandwidth efficiency property of the considered space-time trellis code. Applying the above method to Tarokh et al. space-time trellis codes, significant performance improvements can be obtained even with extremely short input information frames. The application of space-time turbo coded modulation to the space-frequency domain is also proposed in this paper. Exploiting the bandwidth efficient orthogonal frequency division modulation (OFDM), multiple transmit antennas and large frequency selectivity offered by typical low mobility indoor environments, the proposed space-frequency turbo coded modulation performs within 2.5 dB of the outage capacity for a variety of practical wideband multiple-input multiple-output (MIMO) radio channels.
Highlights
The knowledge of the fact that increasing the codeword length of block codes or constraint length of convolutional codes leads to better performance dates back to Shannon theory [1]
We propose the space-time turbo coded modulation (STTuCM), a signaling method that with limited increase in decoding complexity enables a large, systematic increase in coding gain while preserving the maximum transmit diversity gain of the underlined space-time trellis code
The application of space-time coding (STC) to the space-frequency domain exploiting the bandwidth efficient orthogonal frequency division modulation (OFDM) modulation was presented as a natural solution for future high data rates over wide band multiple-input multiple-output (MIMO) radio channels [30]
Summary
The knowledge of the fact that increasing the codeword length of block codes or constraint length of convolutional codes leads to better performance dates back to Shannon theory [1]. Behind all schemes is Ungerboeck’s trellis coded modulation (TCM) principle [6], a well-established technique in digital communications, where significant coding gains are achieved through signal set expansion rather than sacrificing data rate or bandwidth efficiency. Due to the lack of systematic procedure for building STTrCs for a large number of trellis states it turned out to be a tedious task Such an attempt [17] resulted in highly nonoptimized codes as we will show. We propose the space-time turbo coded modulation (STTuCM), a signaling method that with limited increase in decoding complexity enables a large, systematic increase in coding gain while preserving the maximum transmit diversity gain of the underlined space-time trellis code. We outline the other attempts to apply the Turbo principle to MIMO systems [20, 21, 22], which can be mainly summarized as combinations of binary, single antenna turbo codes with spatial multiplexing at the transmitter and suboptimal ML demodulation and Turbo decoding at the receiver
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