期刊
IEEE TRANSACTIONS ON COMMUNICATIONS
卷 51, 期 1, 页码 22-24出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2002.807607
关键词
direct-sequence modulation; spectral efficiency; spread-spectrum; trellis-coded modulation optimum transmission; ranges
We consider a direct-sequence multihop packet radio network using slotted ALOHA in a Rayleigh fading environment. We are interested in optimally choosing the transmission range, code rate, and slotted ALOHA transmission probability to be used by each node. We use a new performance measure, information efficiency, to analyze the network and show that the information efficiency of the low-cost mobile packet radio network can be improved approximately 20 fold by using the optimum parameters. We suggest a practical trellis-coded modulation scheme which comes close to realizing the theoretic limits found.
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