Self-adaptive predistortion method and device and frequency hopping signal emitter

Abstract

The invention discloses a self-adaptive predistortion method and device and a frequency hopping signal emitter. The self-adaptive predistortion method comprises the following steps of: receiving a synchronization frame number and generating a frame signal according to the synchronization frame number; calculating to obtain a radio frequency channel number ARFCN (Absolute Radio Frequency Channel Number) and a DPD (Digital Predistortion) coefficient according to the frame signal, a user frequency hopping sequence, a signal distribution class instruction and a frame category, and writing the radio frequency channel number ARFCN into an LUT (Look Up Table) coefficient circular list; carrying out comparison computation according to the forward power of a signal subjected to delay processing and digital up-conversion and the feedback power of a predistorted signal, and carrying out error processing on the DPD coefficient according to the comparison computation result and then writing the DPD coefficient subjected to error processing into the LUT coefficient circular list; and predistorting the signal subjected to digital up-conversion according to the DPD coefficient read from the LUT coefficient circular list. The self-adaptive predistortion method and device solve the contradiction between long DPD computation time and rapid frequency hopping time, can self-adaptively switch the DPD coefficient and ensures the DPD compensation performance.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an adaptive predistortion method, an adaptive predistortion device and a frequency hopping signal transmitter. Background technique [0002] The capacity of the mobile communication cellular system is limited by a certain frequency and bandwidth. Taking the GSM (Global System of Mobile communication, Global System for Mobile Communication) standard signal as an example, the frequency must be multiplexed to meet the capacity requirements of a certain area. However, Frequency reuse, especially tight frequency reuse, will inevitably face the problem of how to reduce co-channel interference: the tighter the frequency reuse, the more capacity can be improved, but at the same time it will also increase the co-channel interference. At present, frequency hopping is widely used as an effective way to overcome interference and obtain frequency hopping gain. [0003] Commonly used f...

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Problems solved by technology

[0002] The capacity of the mobile communication cellular system is limited by a certain frequency and bandwidth. Taking the GSM (Global System of Mobile communication, Global System for Mobile Communication) standard signal as an example, the frequency must be multiplexed to meet the capacity requirements of a certain area. However, Frequency reuse, especially tight frequency reuse, will inevitably face the problem of how to reduce co-channel interference: the tighter the frequency reuse, the more capacity can be improved, but at the same time it will also increase the co-channel interference

[0004] In DPD (Digital Prestrotation, digital predistortion) application technology, the application of GSM multi-carrier frequency hopping is a challenge. DPD technology is based on the post-processing model tracking of sampled data. The coefficient update time is second level, while the GSM frequency hopping time is Millisecond level, so the DPD update speed is insufficient, which may cause the DPD model coefficients to not match the current signal frequency, resulting in unsatisfactory DPD cancellation performance

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