A scheme for an interference cancellation receiver with low complexity and latency

High complexity and latency are two of the key issues in adoption of multi-user detection (MUD) techniques for mobile stations in cellular networks. To tackle this issue, a novel multiple access scheme based on the principle of interference cancellation of interleave-division multiple access (IDMA), i.e., grouped spread interleave division multiple access (GSIDMA), was proposed. Lower complexity and latency for mobile stations were achieved by appropriately dividing active users into different groups. The system model of GSIDMA was constructed, followed by analysis on its system capacity, complexity and latency, and bit error rate (BER) performance. Grouping methods and interleaving reuse of GSIDMA were also preliminarily discussed. The analysis and simulations validate that the complexity and latency of the new proposed scheme are lower than those of traditional IDMA, whereas its BER performance is close to the latter. The properties of low complexity and low latency make it more feasible for practical implementation.