Abstract
In this paper, a novel dual-metric, the maximum and minimum Squared Euclidean Distance Increment (SEDI) brought by changing the hard decision symbol, is introduced to measure the reliability of the received M-ary Phase Shift Keying (MPSK) symbols over a Rayleigh fading channel. Based on the dual-metric, a Chase-type soft decoding algorithm, which is called erased-Chase algorithm, is developed for Reed-Solomon (RS) coded MPSK schemes. The proposed algorithm treats the unreliable symbols with small maximum SEDI as erasures, and tests the non-erased unreliable symbols with small minimum SEDI as the Chase-2 algorithm does. By introducing optimality test into the decoding procedure, much more reduction in the decoding complexity can be achieved. Simulation results of the RS(63, 42, 22)-coded 8-PSK scheme over a Rayleigh fading channel show that the proposed algorithm provides a very efficient tradeoff between the decoding complexity and the error performance. Finally, an adaptive scheme for the number of erasures is introduced into the decoding algorithm.
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Supported by the National Natural Science Foundation of China (No.60272057).
Communication author: Xu Chaojun, born in 1978, male, doctoral candidate. State Key Lab. of Integrated Service Networks, Xidian University, Xi’an 710071, China.
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Xu, C., Sun, Y. & Wang, X. Erased-Chase decoding for RS-coded MPSK signaling over a Rayleigh fading channel. J. of Electron.(China) 24, 296–300 (2007). https://doi.org/10.1007/s11767-005-0173-z
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DOI: https://doi.org/10.1007/s11767-005-0173-z
Key words
- Reed-Solomon (RS) codes
- Coded M-ary Phase Shift Keying (MPSK)
- Rayleigh fading
- Dual-metric
- Chase decoding