CDMA系统中,信号在无线信道中传输,由于多用户同时同频传输和多径衰落的存在,导致多址干扰(MAD和符号间干扰(ISI),使系统接收机的性能下降。空时接收机(2-D RAKE)能够有效地抑制MAI和对抗多径衰落,这里介绍了几种接收机的工作特点,并对各种空时接收机进行了详细的分析和比较。
In Code - Division Multiple Access(CDMA) system, Multiple Access Interference(MAI) and Inter - Symbol Interference(ISI) are caused due to multiple users transmitting at the same time and frequency,and the existence of multi - path fading while signal transimitting through the wireless channel. As a result,the performance of system receiver degrades. Space -time receivers (2 -DRAKE) can effectively suppress MAI and fight against MPI. In this paper, the characteristics for several spacetime receivers are discussed. At the same time,each receiver is analyzed and compared detailedly.