Optimizing information efficiency in a direct-sequence mobile packet radio network |
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Authors: | Chandra M.W. Hughes B.L. |
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Affiliation: | Cisco Syst., Research Triangle Park, NC, USA; |
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Abstract: | 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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