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针对多用户多输入多输出(MIMO)下行链路,提出一种降低反馈开销的双阈值机会传输策略.该策略采用双阈值判断机制,其中严格阈值用于降低反馈开销,宽松阈值保证系统具有低的中断概率.在每个时隙,仅信道质量满足阈值要求的用户向基站反馈信息.基站根据所获信道信息从候选用户中选择一个进行通信.此外,各用户进行自适应通信方式,包括波束成形和空分复用,使反馈开销动态变化,有效利用发射功率,改善通信性能.理论分析和仿真结果表明,该策略能够显著降低反馈开销,获得高的吞吐量和好的中断性能.
Aiming at multi-user multiple-input multiple-output (MIMO) downlink, a double-threshold opportunistic transmission strategy is proposed to reduce the feedback overhead. The double-threshold decision mechanism is adopted in this strategy. The strict threshold is used to reduce the feedback overhead and the relaxed threshold ensures that the system has low In each time slot, only the channel quality meets the threshold requirements of the user feedback information to the base station base station based on the channel information received from the candidate user to select a communication. In addition, each user adaptive communication mode, including the beam Shaping and space division multiplexing, the feedback overhead is dynamically changed, the transmission power is effectively used to improve the communication performance.The theoretical analysis and simulation results show that this strategy can significantly reduce the feedback overhead, obtain high throughput and good interrupt performance.