一种高效的CDMA/TDMA移动通信技术

An Efficient CDMATDMA Mobile Communications Technique

给出多速率CDMA(码分多址)移动系统中不同速率信道发功率与发信速率的关系式,纠正了原常用计算式的错误,并由此导出一种码分多址/时分多址技术可用于改进原FDD WCDMA和cd-m a2000标准中只使用码分多址和VSF(可变扩频因子)实现多用户多速率兼容的方法。该新技术使用码分多址区分语音数据用户、数据速率近似等于语音用户速率的数据用户和一条高速数据信道,而在高速数据信道中再利用时分多址的方法区分那些高速数据用户。在语音和低速数据用户接收机中可以使用简单的干扰抵消器,用于消除一条高速数据信道产生的自干扰。这种新技术可以增加系统容量,减少发功率需求,并使用较简单的干扰抵消器,降低系统成本。

This paper presents the equations governing the relation of transmission power and data rate in multirate CDMA mobile systems. Having corrected the errors of conventional formula, we deduce a novel technique by combining CDMA mode with TDMA that can be used to improve the immaturity of the multi-user and multi-rate compatibility in former FDD WCDMA and cdma2000 standards, which only employ CDMA mode and VSF. The new method employs CDMA mode to distinguish the voice data users the low rate data users with data rate approximating to voice user, and a unique high rate data channel. Within the high rate data channel, TDMA mode is introduced to identify high rate data users. We can simply use an interference eliminator in voice and low rate data user receiver to eliminate the self-interference produced by high rate data channel. This method could increase system capacity and decrease transmission power, and also drop system cost by employing simple interference eliminator.