Performance Analysis of Softened Two-bit Combination Scheme in Imperfect Reporting Channel

In cognitive radio system, softened hard combination scheme with two-bit overhead for each cognitive radio (CR) user can achieves a good tradeoff between detection performance and complexity. In this paper, we study the performance of two-bit hard combination scheme and derive formulas of false alarm and detection probability under imperfect reporting channel. Also the comparison of performances between two-bit hard combination scheme and one-bit hard combination scheme in imperfect reporting channel is exhibited. Numerical results will show that the performance is affected by the bit error probability (BEP) of reporting channel and much better than convention hard combination scheme.