Transmitter and transmitter signal processing method

Abstract

The invention discloses a transmitter and a transmitter signal processing method. The transmitter comprises a pre-distortion processing unit, a digital-analog conversion unit, a radio frequency unit, a power amplifier, a coupler, a feedback radio frequency unit, an analog-digital conversion unit, an adaptive tracking algorithm unit, a lookup table storage unit and a lookup table control unit; the lookup table control unit is used for detecting input digital baseband signals, and sending an update signal to the pre-distortion processing unit when a predestinated frame of input digital baseband signals ends; the pre-distortion processing unit takes a digital pre-distortion parameter out of the lookup table storage unit according to the update signal, and carries out pre-distortion on the input digital baseband signal according to the taken out digital pre-distortion parameter. The transmitter and the transmitter signal processing method ensure that signals output by the pre-distortion processing unit can not generate jumps, thus improving the pre-distortion effect of the input digital baseband signal, namely stability and reliability.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a transmitter and a signal processing method of the transmitter. Background technique [0002] Improving the efficiency of the transmitter and reducing power consumption is a hot spot in the industry at present. In the existing wireless communication technology, in order to improve the utilization of limited spectrum resources, most communication systems use modulation methods with high spectrum utilization, such as QPSK, etc. These modulation methods will produce non-constant envelope modulation with a large peak-to-average ratio Signal, for the signal generated by the widely used multi-carrier combining technology, it will produce large envelope fluctuations, and the peak average of the signal will increase. The linearity requirements for the digital-to-analog conversion unit, radio frequency unit, and power amplifier of the transmitter higher. Due to the unavoidable n...

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Problems solved by technology

However, in this scheme, the pre-distortion processing unit performs pre-distortion processing on the input digital baseband signal according to the pre-distortion parameters output by the adaptive tracking algorithm unit. If the pre-distortion parameters output by the adaptive tracking algorithm unit and the pre-distortion processing unit If the digital baseband signal does not match, it will cause a sudden change in the signal output by the pre-distortion processing unit, which will affect the effect of pre-distortion processing on the digital baseband signal

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