Abstract
This paper presents the design of space-time turbo trellis coded modulation (ST turbo TCM) for improving the bandwidth efficiency and the reliability of future wireless data networks. We present new recursive space-time trellis coded modulation (STTC) which outperform feedforward STTC proposed by Tarokh et al. (1998) and Baro et al. (2000) on slow and fast fading channels. A substantial improvement in performance can be obtained by constructing ST turbo TCM which consists of concatenated recursive STTC, decoded by iterative decoding algorithm. The proposed recursive STTC are used as constituent codes in this scheme. They have been designed to satisfy the design criteria for STTC on slow and fast fading channels, derived for systems with the product of transmit and receive antennas larger than 3. The proposed ST turbo TCM significantly outperforms the best known STTC on both slow and fast fading channels. The capacity of this scheme on fast fading channels is less than 3 dB away from the theoretical capacity bound for multi-input multi-output (MIMO) channels.
Highlights
In the present cellular mobile communication systems, multiple antennas are being considered for applications at base station receivers with the aim to suppress cochannel interference and minimize the fading effects on the uplink
Provided that r · nR ≥ 4 and δH · nR ≥ 4, we can construct a set of recursive space-time trellis coded modulation (STTC) which best satisfy the design criterion and perform well on both types of fading channels, and can be directly used as constituent codes in a parallel concatenation structure
All figures we have shown confirm that the new recursive STTC outperforms feedforward STTC of the same memory order previously proposed in [1, 3], both on slow and fast fading channels
Summary
In the present cellular mobile communication systems, multiple antennas are being considered for applications at base station receivers with the aim to suppress cochannel interference and minimize the fading effects on the uplink. Code design criteria based on the rank and the determinant of the codeword distance matrix for trellis based ST codes were derived in [1, 2] In this approach, multiple transmit antennas and error correction coding are combined with higher level modulation schemes. For high diversity orders, (larger than 3), the minimum trace of the codeword distance matrix, or equivalently the minimum squared Euclidean distance, dominates the code performance and its minimum value should be maximized in code design Motivated by this design criterion, in this paper we design recursive STTCs and demonstrate that they are superior to feedforward STTCs reported in [1, 3]. We construct an ST turbo trellis modulation (TCM) scheme with the new recursive STTCs as constituent codes. We estimate that the proposed ST turbo TCM codes are less than 3 dB away from the MIMO theoretical channel capacity limit [13]
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