Title :
Adaptive coding for slotted DS-SSMA packet radio systems
Author :
Zhang, Qian ; Wong, Tan F. ; Lehnert, James S.
Author_Institution :
Purdue Univ., West Lafayette, IN, USA
Abstract :
In order to achieve adaptive coding, the type-II hybrid ARQ protocol is applied to a slotted direct-sequence spread-spectrum multiple-access (DS-SSMA) packet radio system with a finite number of users. Two-dimensional Markov chains are employed to model the system dynamics. Based on this model, the performance of the type-II hybrid ARQ protocol is upper and lower bounded by considering, respectively, a superior scheme and an inferior scheme. The steady state throughput and delay performance of the two bounding schemes are obtained. Moreover, the optimal retransmission policy is found for each fixed input load
Keywords :
Markov processes; adaptive codes; multi-access systems; packet radio networks; protocols; spread spectrum communication; 2D Markov chains; adaptive coding; delay performance; direct-sequence spread-spectrum multiple-access; input load; lower bound; optimal retransmission policy; performance; slotted DS-SSMA packet radio systems; steady state throughput; system dynamics; type-II hybrid ARQ protocol; upper bound; Adaptive coding; Automatic repeat request; Delay; Feedback; Packet radio networks; Protocols; Radio transmitters; Spread spectrum communication; Steady-state; Throughput;
Conference_Titel :
MILCOM 97 Proceedings
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4249-6
DOI :
10.1109/MILCOM.1997.648720
