Selection method of modulation encoding way for TD-HSPA+multi-user MIMO system

Abstract

The invention relates to a selection method of the modulation encoding way for a TD-HSPA+multi-user MIMO system, the selection method comprises the steps of using a base station for comprehensively considering the interferences among multiple users and the influences of signal channel changes between two times of scheduling according to signal channel quality information of a downlink of the previous scheduling fed back by a mobile station, and selecting the modulation encoding way of the current scheduling, thereby increasing the average throughput of the system and improving the first transmission accuracy rate. The base station can significantly upgrade the transmission performance of the system and improve the first transmission accuracy rate and the average throughput of the system by only carrying out pretreatment on SINR before the selection of the modulation encoding way on the basis of not amending the existing communication protocol system and not obviously increasing the complexity of the system and the signaling cost, and the system gains are more obvious in particular to the scenarios of serious interferences among the users and obvious time delay of two times of scheduling.

Description

technical field [0001] The invention relates to a method for selecting a modulation and coding mode used in a TD-HSPA+multi-user MIMO system, and belongs to the technical field of wireless multi-antenna communication systems. Background technique [0002] TD-HSPA+ (Enhanced High Speed ​​Packet Access) is an evolved version of TD-SCDMA (Time Division Duplex Synchronous Code Division Multiplexing Access) system. Its purpose is to reduce transmission delay and enhance the transmission capacity of uplink and downlink data services. Compared with the HSPA system, on the basis of hybrid automatic retransmission, adaptive modulation and coding and other technologies, the downlink multi-antenna MIMO (multiple input and multiple output) technology is added to improve system performance by utilizing spatial characteristics. As the transition stage of the evolution from 3G system to 4G LTE (Long Term Evolution) system, the in-depth analysis and research on TD-HSPA+ system has important...

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Problems solved by technology

[0007] Since the mobile station cannot obtain the user pairing information for the next transmission when feeding back the CQI (Channel Quality Indication), the calculated SINR (Signal to Interference and Noise Ratio) does not include the influence of inter-user interference, and the obtained SINR value is relatively high. Therefore, the base station The selected modulation and coding method has a high level, which leads to a high error probability when the mobile station receives, and requires multiple mixed automatic retrans

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