Multi-beam Joint Detection Combination for TD-SCDMA Compatible Mobile Satellite Communication System

Based on the characteristic that received signals of different beam cells are sent to the same gateway station in the multi-beam satellite system, this paper introduces a technique of multi-beam joint detection combination for TD-SCDMA compatible mobile satellite communication system. The proposed technique adopts Adjacent Beam Assisted Single-beam Joint Detection (ABA-SB-JD) technique to get the detection signals of users in each target-beam cell and adjacent beam cells from the interference signals of users in adjacent beam cells, and detects the signal of the same user in each beam cell according to the maximal ratio combining principle. The simulation results show that this technique gets a good system bit-error rate performance, significantly reduces the SNR threshold of the system, and greatly improves multi-user detection performance of the multi-beam satellite communication system.