Multiple access communication system with ARQ and interference cancellation

摘要

The multiple access communication system, especially OFDMA-CDM system, transmitting digital data symbols in packet form uses automatic repeat request (ARQ) means combined with soft parallel or serial interference cancellation (IC) means to achieve error free multi-user wireless transmission of packets. Superimposed packet allocation for packet transmission is provided where each transmitted packet is associated with one spreading code. An iterative algorithm is applied which is a combination of IC and hybrid ARQ based on soft value combining (SVC), said algorithm exploiting reliability information of erroneously received copies of the same data packet to improve the performance of interference cancellation. Ideal reconstruction of the interference of correctly received packets is performed and reconstructed interference is subtracted from received signal vector. The invention may be used for multi-carrier wireless or wired transmission systems with any type of interference.