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Mobile station receiving circuit for CDMA system sparetime spread spectrum method

A technology for receiving circuits and mobile stations, applied in transmission systems, diversity/multi-antenna systems, electrical components, etc., can solve problems such as difficulties in mobile stations, difficult to implement, and difficult to implement in engineering, and achieves improved system bit error rate performance and improved performance. The quality of information transmission, the effect of eliminating multiple access interference

Inactive Publication Date: 2012-09-05
BEIJING JIAOTONG UNIV
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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

Method used

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  • Mobile station receiving circuit for CDMA system sparetime spread spectrum method
  • Mobile station receiving circuit for CDMA system sparetime spread spectrum method
  • Mobile station receiving circuit for CDMA system sparetime spread spectrum method

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Embodiment Construction

[0047] refer to figure 1, the invention is a space-time spread spectrum method for downlink of CDMA system. The system of the present invention includes a base station and a plurality of mobile stations. The base station has two antennas, and each mobile station has only one antenna. The base station performs transmit diversity on the multi-user data flow b at the baseband, and its transmit diversity circuit includes down-sampling modules 111 and 112, a delay module 122, spreaders (multipliers) 131, 132, 133, 134, and adders 141 and 142 .

[0048] combine figure 2 , the steps of baseband processing of the base station transmit signal are:

[0049] 1) Step 21: Divide each user's data stream into odd data stream and even data stream

[0050] The data stream b of each user is divided into two paths, and the odd data stream b1 and the even data stream b2 are obtained through the down-sampling modules 111 and 112 . Data stream b is BPSK modulated.

[0051] 2) Step 22: Adjus...

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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 aThe 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 mdders 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 onultipliers 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, ande 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, andthe design of the receiving circuit is simplified.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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B7/06H04B1/7103
Inventor 肖扬
Owner BEIJING JIAOTONG UNIV
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