Research On MIMO Multiuser Broadcasting Channel Precoding Technology

Wireless communication is experiencing the fastest growing period, its rapid development due to advanced communications technology research and application. As wireless communication system of practical application rapid popularization, wireless communication subscribers and customer service demand into exponential progression growth, but wireless communication service radio spectrum resources are extremely limited, make growing wireless service demand and limited radio spectrum resources contradiction become prominent. Multi-input multi-output (MIMO) multiple antenna technology is a kind of new wireless communication technology to overcome this obstacles, this technology equipt multi-antennas on both transmit and receive terminal, can without any increase in signal transmission power, and bandwidth circumstances greatly improved system of communication channel capacity and transmission reliability, greatly enhancing communication system of spectrum efficiency, but also provide rich diversity gain, reuse gain and the array gain, meet the user's high rate telecommunication demand at home and abroad, so it has been widely attention and research, it have already become one of the most development prospect of technical for the next generation mobile communication systemAt present, the multiple-input multiple-output (MIMO) system research transfer gradually from a single user MIMO to multiuser MIMO systems, in MIMO multi-user system, the downlink signal processing is difficulty and key issue, downlink MIMO multi-user system generally have base stations transmitting antenna, many mobile stations are configurated one or more receiving antenna, this kind of downlink signal transmission also called MIMO multi-user broadcasting channel transmission. Due to different mobile stations are geographically dispersed, mobile station unable to realize mutual cooperation, therefore can not use the uplink receiving algorithm to detect transmitting signal. When transmit side knows channel state characteristics (CSI), precoding for transmit signaling can better eliminate multi-user interference among each user receiving from other users interference signals, thus greatly simplifies the complexity of receiver, this technology has great practical value.This paper focus on the multiple-input multiple-output (MIMO) multiuser broadcasting channel encoding technology studied, and the main contents include:linear's handling of the forced zero precoding, regularization precoding, block diagonalization linear precoding,based on the dirty paper coding theory of nonlinear processing THP precoding, vector perturbation pre coding. And will discuss at two situation:single antenna receive and multi-antenna receive,at the last part of paper, we propose based on MMSE criterion of vector perturbation precoding design.