Adaptive Transmission for Direct-Sequence Spread-Spectrum Communications over Multipath Channels

摘要

A mehtod is proposed and evaluated for energy-efficient adaptive transmission in direct-sequence spread-spectrum packet communications over specurlar multipath channels. The power, code rate, and symbol rate are adapted to match the multipath profile and propagation loss of the wireless communications channel. The adaptation of the transmission parameteres is based on several statitics that can be derived in a spread-spectrum receiver. The transmission parameters are selected to optimze a performance measure that is related to the eneryg consumption and time duration of a packet transmission.