Joint Energy and Mutual Information Accumulation for Cooperative Multi-relay High-speed Railway Mobile Communication System with Fountain Codes

In this paper, we investigate how to design effective strategy to improve the transmission data rate for highspeed railway mobile communication system with fountain codes. We consider a cooperative multi-relay architecture, where each relay is equipped with one antenna and the destination is with multiple antennas deployed. To this end, a new information receiving method at the destination is proposed, which combines the energy accumulation and mutual information accumulation together. To evaluate the performance of the proposed method, we derive the probability density function of the transmission rate in Rayleigh fading channels, and based on this, we give the average transmission rate of our method. Since the considered multi-relay architecture with multi-antenna destination can be regarded as a virtual MIMO system, we compare our proposed information receiving method with traditional MIMO detection in terms of transmission rate. Numerical results show that our method achieves higher transmission rate than using traditional MIMO information detection in multi-path fading channels. This work also gives some insights that the proposed information receiving method on the basis of multi-relay multi-antenna architecture with fountain codes has great potential in improving the system performance of high-speed railway mobile communications.