Tao Xiaofeng, Wang Shan, Li Yingqi, L. Baoling, Zhang Ping
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引用次数: 0
Abstract
The joint transmission (JT) technique was mainly presented by Baier et al. (2000). JT used in the downlink channel does not require a training sequence in the downlink in theory. Moreover, the mobile station (MS) does not demand channel estimation. However, JT requires a huge dynamic range and good linearity of the power amplifier of the transmitter because of the high peak to average ratio of transmitted signals of JT. In this paper, a new scheme called pre-distortion based joint transmission is proposed. Two pre-distortion approaches are also presented. One is based on the pre-clip technique, the other on a pre-nonlinear power amplifier. Finally, simulation results show that the pre-distortion based JT scheme has better BER performance and the BER performance of pre-distortion based JT under nonideal power amplifier is better than that of JT under ideal power amplifier. This is to say, maybe it is not worth compensating the deep channel shading.
联合传动(JT)技术主要由Baier et al.(2000)提出。在下行信道中使用的JT理论上不需要在下行信道中使用训练序列。此外，移动台(MS)不需要信道估计。但由于JT传输信号的峰均比高，因此对发射机功率放大器的动态范围要求大，线性度要求好。本文提出了一种基于预失真的联合传动方案。提出了两种预失真方法。一种是基于预夹技术，另一种是基于预非线性功率放大器。最后，仿真结果表明，基于预失真的JT方案具有更好的误码率性能，且在非理想功率放大器条件下，基于预失真的JT方案的误码率优于理想功率放大器条件下的JT方案。这是说，也许不值得补偿深通道遮光。
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