DocumentCode :
2387347
Title :
Adaptive rate error control for the land-mobile satellite channel
Author :
Rice, Michael
Author_Institution :
Dept. of Electr. & Comput. Eng., Brigham Young Univ., Provo, UT, USA
fYear :
1994
fDate :
1-5 May 1994
Firstpage :
1145
Abstract :
An adaptive rate error control system is presented for communication over a land mobile satellite channel described by a finite state Markov chain. In channel states where the fading is moderate, the code rate is high thus providing increased throughput. In channel states where the fading is more severe, a low rate code is used to provide the necessary error protection. Retransmission requests used by hybrid-ARQ error control are incorporated into the Viterbi decoder following a modification proposed by Yamamoto and Itoh (1980). The decision to change code rates is made by a sequential statistical test which monitors the frequency of retransmissions. The essentials are presented in an example which illustrates the significant performance improvements realized by the adaptive system
Keywords :
Markov processes; Viterbi decoding; adaptive codes; automatic repeat request; error correction codes; fading; land mobile radio; mobile satellite communication; packet switching; radiofrequency interference; time-varying channels; variable rate codes; Viterbi decoder; adaptive rate error control system; channel states; code rate; error protection; fading; finite state Markov chain; frequency of retransmission; hybrid-ARQ error control; land-mobile satellite channel; low rate code; performance; retransmission requests; sequential statistical test; throughput; Adaptive control; Artificial satellites; Decoding; Error correction; Fading; Mobile communication; Programmable control; Protection; Throughput; Viterbi algorithm;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 1994. ICC '94, SUPERCOMM/ICC '94, Conference Record, 'Serving Humanity Through Communications.' IEEE International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-1825-0
Type :
conf
DOI :
10.1109/ICC.1994.368923
Filename :
368923
Link To Document :
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