Method and system of interference cancellation in

专利名称：Method and system of interference

cancellation in multi-cell CDMA systems

发明人：Chun Chian Lu申请号：US10218456申请日：20020815公开号：US07321610B2公开日：20080122

专利附图：

摘要：In signal detection system and method implemented to reduce the effects ofinterference in multi-user detection systems, a receiver defines a frame of symbolscontaining at least one window based upon a number of user signals contained in a

received signal r(t). A symbol amplitude of a single-user in the multi-user system isapproximated over the window of the frame based on a number of reflected signal pathsof the received user signal. A perturbative correction value is calculated based upon acorrelation matrix. An estimation of the symbol amplitude of the single-user signal iscalculated over one or a number of windows of the frame. The single-user signal isdetected when the symbol amplitudes of the entire signal within the frame has beencalculated. To reduce the number of interfering users in a multicell CDMA system, thesymbol codes are modified to include an even code and an odd code. The even and oddcodes are symmetrically separated over the duration of the symbol to form an

interference reduction window. If the delay offsets of the symbol codes are less than theinterference reduction window and the even codes are assigned to a first cell, and oddcodes to adjacent cells, then the adjacent cell interference vanishes.

申请人：Chun Chian Lu

地址：Hsinwu Hsiang TW

国籍：TW

代理机构：Akin Gump Strauss Hauer & Feld LLP

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