Performance analysis and iterative decoding of I-Q trellis space-time codes
نویسنده
چکیده
I-Q trellis codes are known to increase the time diversity of coded systems.When I-Q codes are used with multiple transmit antennas, the decoding and performance evaluation requires the construction of the high-complexity super-trellis of the component codes. In the paper, the bit error probability and the design criteria of I-Q space-time (ST) codes are derived using the transfer functions of the component codes. Conditions for the geometrical uniformity of I-Q ST codes are derived from the geometrical uniformity of the component codes. In addition, a low-complexity iterative receiver for I-Q ST codes is presented. The receiver essentially performs iterative detection and decoding. Results show that three iterations of the iterative receiver performs very close to the optimal decoding.
منابع مشابه
Iterative Decoding Algorithms for I-Q Space-Time Codes
I-Q ST codes have shown the potential to provide high coding gains in rapid fading environments. The optimal decoding of I-Q ST codes involves the use of the super-trellis of the I and Q codes, which is complex in general. This paper proposes two iterative decoding algorithms for I-Q ST codes. The proposed algorithms have similar performance to optimal decoding with much lower complexity.
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