Wideband adaptive digital predistortion engine apparatus based on programmable device

Abstract

The invention relates to a wideband adaptive digital predistortion engine (WADPDE) device based on programmable equipment. The device comprises an input matrix module, a simulation baseband signal transmitter module, an interpolator module, a peak clipping module, a wideband digital predistorter module, an output matrix module, an MPU control kernel module and a USB interface module which are mutually connected by communication buses on a high-speed chip, wherein, the wideband digital predistorter module comprises a filter input generation module, a predistortion filter array module, a filter output combining module, a system buffer module, a DDC module, a delayed match module, a signal data buffer module, an interface control module and a coefficient estimation and updating algorithm module. The WADPDE device of the invention has high integration, simple hardware structure, high processing speed, strong flexibility and good universality, can realize real-time signal processing, directly communicate with PC computers and be adjusted according to practical application, thereby being convenient for human-computer interaction.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a digital pre-distortion technology adopted by a transmitter in a broadband wireless communication system, in particular to a wide-band self-adaptive digital pre-distortion engine device based on a programmable device. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) signal is composed of a large number of independent and uniformly distributed components. According to the central limit theory, its amplitude distribution can be approximated as a Gaussian distribution. Therefore, compared to the average level of the signal, the OFDM signal formed by superimposing a large number of modulated sub-band signals may have a very high instantaneous signal peak value during transmission. For this drastic change characteristic of the OFDM signal envelope, the peak power The ratio to the average power (Peak-to-Average Power Ratio or PAPR) is measured. H...

AI Technical Summary

Problems solved by technology

However, the current development of linearization technology is far from meeting the higher requirements of wireless communication, especially in the face of the increasingly wide transmission bandwidth of the next-generation mobile communication system 4G, some domestic universities and Research units have also begun to pay attention to this technology research

At present, the most commonly used hardware scheme of DPD system is composed of FPGA and a DSP (Digital Signal Processor, digital signal processor), in which FPGA mainly completes digital pre-distortion processing, and DSP mainly completes self-adaptive algorithm to obtain pre-distortion parameters. Leading to a decrease in its integration and an increase in cost

Images