Title :
A type-I hybrid ARQ protocol over optimal-sequence CDMA link
Author :
Wong, Tan F. ; Gao, Li ; Lok, Tat M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA
Abstract :
It has been shown that the capacity of a CDMA link can be significantly enhanced by optimally selecting or adapting the set of spreading sequences employed under the constraint that a prescribed level of SNR performance is achieved. We propose a type-I hybrid ARQ protocol which makes use of the optimally selected spreading sequences in the physical layer to allow simultaneous transmission of multiple packets over a CDMA link. Packets are divided into two classes, namely retransmission packets and newly arrived packets. Packets in each class are assigned optimally selected spreading sequences and a target SNR. With proper choices of the number of packets to be transmitted and the SNR targets in each time slot, the proposed type-I hybrid ARQ protocol provides significant improvement on the link throughput, particularly when the transmission power is abundant
Keywords :
automatic repeat request; channel capacity; code division multiple access; optimisation; packet radio networks; radio links; sequences; spread spectrum communication; FCFS packet transmission; SNR performance; first come first serve; link capacity; link throughput; multiple packets transmission; newly arrived packets; optimal-sequence CDMA link; optimally selected spreading sequences; retransmission packets; time slot; transmission power; type-I hybrid ARQ protocol; Automatic repeat request; Communication channels; Delay; Multiaccess communication; Physical layer; Power engineering and energy; Protocols; Resource management; Throughput; Wireless communication;
Conference_Titel :
MILCOM 2000. 21st Century Military Communications Conference Proceedings
Conference_Location :
Los Angeles, CA
Print_ISBN :
0-7803-6521-6
DOI :
10.1109/MILCOM.2000.905023
