TD-SCDMA Pre-distortion Technology Research And Application

This article deals with a TD-SCDMA system, the number of pre-distortion method, in particular, in the field of wireless communications TDD system uses digital pre-distortion (DPD) technology to improve RF power amplifier linearity and enhance its output power.Firstly,based on the pre-distortion table by way of a digital pre-distortion technology to simplify expression, the method can be used for at least the pre-distortion compensation parameters to the effective non-linear amplifier characteristics, and easy to realize through digital devices, such as to avoid the pre - distortion when the need to constantly deal with the many amendments to the search parameters and the complexity of calculating the disadvantage that can reduce processor DPD pieces deal with capacity requirements and to reduce device power consumption; simulation showed that the methods and properties of a very classical method so that it can after the single-carrier, the six-carrier TD-SCDMA signal adjacent channel power leakage ratio (ACLR) performance improvement of 10dB, 20dB and at the same time his band distortion has also been improved.Secondly, based on the characteristics of the TD-SCDMA signal itself, which samples mid-frequency feedback data through fixed position of the downlink time slot in TD-SCDMA system, A digital pre-distortion method for TD-SCDMA system are proposed to avoid a large number of calculations required by the selection of searching the feedback data, The method can reduces resolving capacity requirements and device power consumptions, while simulation shows that the method can achieve the performance of existing methods, further illustrates that it is available in TD-SCDMA system.Finally, after a certain frequency offset single-carrier TD-SCDMA, six carrier signal performance of the DPD simulation and analyzing the results of tests, while the comparative analysis results of the actual performance of DPD simulation and theoretical results described in this article further the proposed algorithm in TD-SCDMA system is feasible.