Mobile station receiving circuit for CDMA system sparetime spread spectrum method

Abstract

The invention relates to a mobile station receiving circuit for a CDMA system sparetime spread spectrum method, which comprises two matching wave filters in parallel connection, two multipliers, two adders and two decision devices, wherein the two matching wave filters input receiving signals respectively; the two multipliers are connected with the two matching wave filters respectively; the two multipliers are connected with the two adders respectively; the two decision devices are connected with the two adders respectively; and the input of each adder is an opposite phase of the output of one multiplier and the output of the other multiplier. With the invention, a mobile station obtains diversity gain when receiving data, the information transmission quality of a system is improved, and the design of the receiving circuit is simplified.

Description

technical field [0001] The invention relates to a mobile station receiving circuit of a CDMA system space-time spread spectrum method, and belongs to the field of mobile communication. Background technique [0002] The direct spread spectrum technology of multiple transmit antennas is used in the forward and reverse links of CDMA system, which can effectively improve the system performance. CDMA 1X uses direct spread spectrum transmit diversity technology, which has two methods: [0003] (1) One is Orthogonal Transmit Diversity OTD (Orthogonal TransmitDiversity) [0004] The method is that the CDMA base station first separates the data streams and then spreads the two data streams with different orthogonal Walsh codes, and transmits them through two transmitting antennas of the base station. [0005] (2) The other is the space-time spread spectrum diversity method STS (Space Time Spreading) [0006] The CDMA base station uses two spatially separated antennas to transmit t...

AI Technical Summary

Problems solved by technology

[0010] In the existing space-time spread spectrum technology (STS), the distance between the transmitting antennas of the base station must be greater than 10-15 times the wavelength of the radio frequency signal to ensure that the transmitting signals of each unit of the antenna array are not correlated with each other, which causes difficulties in engineering implementation

Because due to objective conditions, the spacing of CDMA base station transmitting antennas may not meet the aforementioned requirements

The existing space-time spread spectrum technology with multiple transmitting antennas requires the mobile station to have multiple antennas, which brings great difficulties to the technical realization of the mobile station, increases the cost of the mobile station, and increases the size of the mobile station

The receiving despreading algorithm of the mobile station in the aforementioned literature requires a large number of matrix operations, so it is difficult to implement

Images