g and Partial-Ban nterference on the erformancce of lation Scheme fo bust Wireless CO
R.F. Ormondroyd, E Ai-Sus · 1998
The performance of a COFDWCDMA radio communication system in the presence of partial-band jamming is presented where the e!ffects of multipath and additive noise are included The importance of interleaving and coding is emphasised and their impact on the bit error-rate performance is evaluated. In the first part of the paper, the efSect of jamming on a COFDM system is obtained under worst-case conditions. For single tone jamming, the results show that the effect of the jamming signal on the bit error rate is acceptable, even at signal to jamming power ratios as low as -15dB, when interleaving and convolutional coding is used. For the case where 20% of the transmission spectrum is corrupted by partial bandjamming, it is necessary for the signal to jamming power ratio to be 5dB or more to achieve an acceptable bit error rate. To provide additional resilience, the case of an OFDMKDMA scheme is examined where the spread-spectrum process gain is used to provide additional protection against jamming.