Efficient Quantized Soft Decision for Cooperative Sensing System in Cognitive Radio

In order to reduce the bandwidth requirement for reporting channel, we investigated soft and hard data combining rules in cooperative sensing system. Motivated by the detection performance of soft schemes, we further propose an improved quantized soft scheme with two-bit. Simulation findings show that the proposed method out-performs hard decision rules and approaches the detection performance of square law combining rule with reduced cooperative overhead. As a result, the introduced quantized soft scheme can achieve approximately all the benefits of soft decision combining with low complexity and control channel cost.