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A simple chip discrimination technique is presented for use with ultra wide band (UWB), impulse radio (IR) that improves performance for large near/far interference ratios. A typical spread-spectrum IR that employs a matched filter sum for bit decisions is susceptible to small numbers of large power pulses that can dominate the bit decision threshold statistics. This paper describes a technique for chip discrimination prior to the spreading summation that can greatly reduce the effects of large near/far interferers. The technique exploits the unique time domain characteristics that only UWB systems can provide. A statistical model is developed that predicts bit error performance for binary offset pulse position modulation (PPM) as a function of near/far density and power for varying discrimination thresholds. We find that even a small number of very near interferers can greatly reduce the performance of a system without blanking or discrimination. Results show substantial improvement using this method for near interferers with near/far power ratios greater than 20 dB.
Military Communications Conference, 2003. MILCOM '03. 2003 IEEE (Volume:2 )
Date of Conference: 13-16 Oct. 2003