Digital predistortion method and device for TD-SCDMA system

Abstract

The invention discloses a digital predistortion method and a device for a TD-SCDMA system. the method of the invention comprises the following steps that: step 1. when the current time slot signal is a downlink time slot and a DPD module is started, setting a counting threshold and an average power threshold of a counter; step 2. selecting medium frequency feedback data of m symbols from the dataarea of the current downlink time slot, and computing to obtain the average power of time slot signals; and step 3. by judging the average power or counting number of times of the time slot signals obtained by sampling and computing of a medium frequency feedback signal part interval, finding the medium frequency feedback data required to be sampled, and simultaneously discarding the medium frequency feedback data not required to be sampled, thereby avoiding carrying out continual searching, collection and parameter estimation on all medium frequency feedback data in a feedback channel, notably reducing the computing capacity of the DPD module, saving the computing time and reducing power consumption of devices.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a DPD (Digital Pre-Distortion, digital pre-distortion) method and device for a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access) system . Background technique [0002] The realization of radio frequency technology is one of the key technologies for the industrialization of TD-SCDMA system. In order to pursue higher data rates and spectral efficiency, TD-SCDMA systems generally use linear modulation. In addition, the multi-carrier configuration technology leads to changes in the signal envelope, resulting in intermodulation distortion. Although spectrum regeneration has little impact on the current channel, it will interfere with adjacent channels. The non-constant envelope modulation technology used in 3G communication system requires the transmitter to work in a linear state, so linearizatio...

AI Technical Summary

Problems solved by technology

This makes the calculation of the DPD module very large, and the calculation time is long, which affects the performance of digital pre-distortion

If the calculation efficiency of the DPD module is further improved on the basis of a large amount of calculation, it will inevitably increase the research and development cost of the device

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