Space-Time Turbo Trellis Coded Modulation for Wireless Data Communications
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Space-Time Turbo Trellis Coded Modulation for Wireless Data Communications Welly Firmanto School of Electrical and Information Engineering, The University of Sydney, Sydney 2006, Australia Email: [email protected]
Branka Vucetic School of Electrical and Information Engineering, The University of Sydney, Sydney 2006, Australia Email: [email protected]
Jinhong Yuan School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, NSW 2052, Australia Email: [email protected]
Zhuo Chen School of Electrical and Information Engineering, The University of Sydney, Sydney 2006, Australia Email: [email protected] Received 1 June 2001 and in revised form 22 March 2002 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. Keywords and phrases: space-time coding, MIMO fading channels, space-time trellis codes, turbo coded modulation, interative decoding.
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INTRODUCTION
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. The size of base stations allows the deployment of receive diversity on the uplink. On the downlink, however, the limited size and power of the mobile stations make it more practical to consider transmit diversity. Transmit diversity decreases the required processing power of the receivers, resulting in a simpler system structure, lower power consumption and lower cost. Furthermore, transmit diversity can be combined with receive diversity to further improve the system performance and increase the spectral efficiency. Channel coding com-
bined with spatial diversity is called space-time (ST) coding. 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. An ST encoder takes as i
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