Signal receiving method and apparatus in wireless base station

Abstract

The invention relates to a method and device for receiving signal in wireless base station, which converts the upstream signal to high intermediate frequency signal through the front of analogue radio wide band by the antenna of the base station. After being sampled digitally by high speed A / D, multi-path digital channel signals are send to the PLC digital down frequency conversion circuit and divided into multi-path base band orthogonal signals, The after software base band processing based on the base band digital signal processing technology, the bit flow is formed and send to BSC (base station controller) for further processing. In the device, a radio frequency front processing module, a high speed wide band A / D converter, a PLC digital down frequency conversion module and a base band digital signal processing module are connected in order.

Description

technical field [0001] The invention belongs to the field of mobile communication, in particular to a wireless base station signal receiving method and device based on baseband digital signal processing technology. Background technique [0002] With the continuous development of modern mobile communication technology, in the current mobile communication market, multiple systems coexist and new systems emerge constantly, which brings inconvenience to developers and users. The current communication system is constantly transitioning from an analog system to a digital system, which is more conducive to making the communication system adopt a standardized and modular structure. With the emergence of high-speed, high-performance hardware, it has become possible to use software to realize as many hardware functions as possible through software loading. [0003] In the field of mobile communication, although the technology of digital receivers is relatively mature, they generally ...

AI Technical Summary

Problems solved by technology

[0005] In the signal receiving device in the wireless base station of the conventional mobile communication system, the method of sampling and quantizing the low-pass band-limited analog signal in the baseband is usually used to realize the digitization of the received signal, so that the receiver does not have the flexibility to change the channel bandwidth, and also It cannot solve the problems of complex design and high production cost inherent in the analog receiving chain

Among them, the center frequency and bandwidth of general filters are usually fixed. To realize a filter with accurate performance and stable indicators, due to the use of many analog devices, the implementation circuit is more complicated, and the production cost is correspondingly increased; Many narrow-band filters make the amplitude and phase distortion introduced after the signal passes through the channel very large, which reduces the signal-to-noise ratio and dynamic range, and seriously affects the quality of post-processing

At the same time, if a conventional demodulator is used, its demodulation method and code stream format are fixed, which lacks flexibility; and because the demodulated code stream generally cannot be processed in parallel, most of the multi-channel receive diversity adopts the selection diversity method, which cannot be used Other diversity algorithms with better diversity effects to improve the receiving sensitivity of the system

At the same time, the complexity of the hardware makes the size, weight, and functions of the receiver unsatisfactory

Images