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We consider an ultra wide band impulse radio multiple access scheme based on time-hopping code under a realistic multipath channel model. As a novelty, we provide a closed-form expression for the variance of the multiuser interference at the output of the rake receiver of the user of interest. That enables us to characterize the optimal time-hopping codes minimizing the multiuser interference variance. Finally we observe through simulations that minimizing the multiuser interference variance translates into better performance by significantly decreasing the error probability.
Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on (Volume:1 )
Date of Conference: 7-10 Nov. 2004