BER analysis of cognitive simo network basedon D-S theory

In this paper, the bit-error-rate performance (BER) is analyzed for primary single-input multiple-output (SIMO) network in cognitive radio (CR) environment. In underlay mode, secondary network shares the same spectrum occupied by primary network, which inevitably generates interference for primary network. With the assumption that there is one transmit antenna and two receive antennas in primary network, both distributed interference subtraction (DIS) scheme and our proposed Dempster-Shafer theory based signal combining (DSC) scheme are considered to mitigate interference at primary receiver. Simulations are performed for BER performance comparisons between these two schemes. The results show that compared with DIS, DSC achieves more performance gains and is more robust against interference.