干扰消除技术在CDMA网络中的应用

CDMA网络中存在前反向的多址干扰,降低了前反向容量。为了减少多址干扰对前反向容量的影响,对多址干扰产生的原因和机理进行深入分析,详细介绍了多用户检测技术和干扰消除技术。通过对造成干扰的所有用户信号信息进行检测,根据多址干扰信号的结构特征进行干扰消除和信号恢复,从而改善各个信号的信噪比,提高CDMA系统的前反向容量。重点介绍了准线性干扰消除技术QLIC（Quasi-Linear Interference Cancellation）和反向干扰消除技术RLIC（Reverse Link Interference Cancellation）的基本原理,分别对QLIC技术和RLIC技术的容量增益进行了理论推导,并计算了QLIC和RLIC对CDMA网络容量提升的程度。QLIC和RLIC是现有CDMA网络容量提升的重要技术手段,能够为运营商进行技术升级和网络部署提供重要参考。

Application of interference cancellation in CDMA network

The MAI （Multiple Access Interference） impacts the forward and reverse link capacity in CDMA network. In order to reduce the impact of MAI, the resource and mechanism of MAI are analyzed, MUD （Multiple User Detection） and interference cancellation technology are introduced to detect the interfering signal from all other users or other sectors, to cancel interfering signal and recover useful signal, therefore to improve the signal SNR and the system capacity. QLIC （Quasi-Linear Interference Cancellation） and RLIC （Reverse Link Interference Cancellation） are two main interference cancellation technologies applied in CDMA network. The theory and the capacity gain of QLIC and RLIC is introduced and derived, the capacity gain applied in CDMA network is calculated. QLIC and RLIC are the important technology methods to improve the capacity of CDMA network, the CDMA service provider can use QLIC and RLIC to upgrade and deploy the network.