Verfahren und Einrichtung zur Kompensation von Störungen durch Mehrwegeausbreitung in einem Funkkommunikationssytem

摘要

In radio communications system having a point-to-multipoint structure, the compensation for interferences by multipath propagation is decisive for the effectiveness of the system. Existing methods are often complicated and/or inaccurate. For a stationary radio communications system, which comprises a base station (1) and a multitude of subscriber stations (4), that operate in the air interface (3) with DS CDM/CDMA and with an embedded TDM/TDMA and TDD, the channel pulse response is determined by means of an offline method, which is capable of identifying and taking into account the instance of a non-RICE channel. Calculation methods for equalizer coefficients in the I and Q branches are provided for carrying out a complex valent compensation, and digital equalizers having combined feedforward and feedback are used, whereby for the transmission path from the subscriber stations to the base station, a compensation by pre-equalization ensues inside the subscriber stations. The method can be advantageously used in WLL systems (wireless local loop).