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This paper considers the implications of using chirp spread spectrum (CSS) as an antimultipath modulation technique for the transmission of high speed (>10 Mb/s) data in the indoor wireless channel. Three elements are required for a CSS system to perform optimally in the multipath environment-a chirp spreader/correlator for resolution of the channel multipath, a phase-differential modulation scheme to co-phase the multipath components and a RAKE for recombination of the symbol energy. The advantage of CSS is that all three of these elements can be implemented with simple analog hardware. A prototype CSS system is presented along with simulated and measured performance plots in the indoor channel. Test results indicate that a CSS system using DQPSK can perform within 2 dB of Gaussian DQPSK in 10 m non-line of sight (NLOS) indoor channels with excess delay >200 ns, down to bit error rates of 10/sup -7/ with single omni antennas in transmitter and receiver and no coding, at data rates of 20 Mb/s and higher.
Electrical and Computer Engineering, 1999 IEEE Canadian Conference on (Volume:1 )
Date of Conference: 9-12 May 1999