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码分多址 CDMA(Code DivisionMultiple Access) 码分多址指系统内不同用户占用同一频率和同一时间段,但各带有不同的PN码,接收端以这种PN码作为区分和选择信号的判据。码分多址也称扩频多址。 同频干扰降低因素 CIRF(Co-fre-quency Interference Reduction Factor) 同频干扰降低因素指蜂窝系统内采用相同频率的小区基站间距离与小区半径之比。其值越低,系统容量越大。在CDMA系统中,邻区间CIRF为2,本区内CIRF为1。
Code Division Multiple Access Code Division Multiple Access CDMA refers to different users in the system occupy the same frequency and the same time period, but each with a different PN code, the receiver to distinguish and select the signal as the PN code according to. Code division multiple access also known as spread spectrum multiple access. Co-fre quency Interference Reduction Factor Co-fre quency Interference Reduction Factor Co-fre quency Interference Reduction Factor refers to the ratio of the cell-to-cell distance between cells using the same frequency in a cellular system. The lower the value, the greater the system capacity. In the CDMA system, the CIRF between neighboring cells is 2, and the CIRF within this cell is 1.