Distance-optimized space-time trellis codes

We propose methods for improving the performance of the space-time trellis codes for static or slow fading wireless channels. We use the 8-PSK symbol constellation with 8, 16 and 32-state trellis structure introduced by Throkh, Seshadri and Calderbank (1998), subject to the same power, bandwidth and...

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Bibliographic Details
Published in2002 IEEE International Conference on Personal Wireless Communications pp. 56 - 60
Main Authors Milleth, J.K., Giridhar, K., Jalihal, D.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2002
Subjects
Additive white noise
AWGN channels
Communication systems
Convolutional codes
Error analysis
Fading
Receiving antennas
Signal to noise ratio
Transmitters
Transmitting antennas
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Summary:We propose methods for improving the performance of the space-time trellis codes for static or slow fading wireless channels. We use the 8-PSK symbol constellation with 8, 16 and 32-state trellis structure introduced by Throkh, Seshadri and Calderbank (1998), subject to the same power, bandwidth and trellis complexity for a communication system with two transmit antennas and one receive antenna. The modification to be done at the transmitter is either to rotate the constellation points in one of the transmit antenna relative to the other by some angle, or suitably divide (unequally) the total power between the two transmit antennas. We optimize the angle of rotation and power division by maximizing the d/sub free/ of the trellis codes. Simulation results show that, for AWGN channels, frame error rate performance can be improved by doing either rotation or power division at the transmitter.
ISBN:0780375696
9780780375697
DOI:10.1109/ICPWC.2002.1177245