Automatic frequency control method in CDMA mobile communication system
A mobile communication system, automatic frequency control technology, applied in the direction of code division multiplexing system, multiplexing communication, transmission control/equalization, etc., can solve the problem of reducing system multipath processing performance, unreasonable AFC technology, Error correction, etc.
Active Publication Date: 2009-04-29
南通誉力智能装备有限公司
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When there is a path signal at this phase point, due to the complete correlation of the received signal, the obtained frequency offset estimation result is more accurate; on the contrary, when there is no path signal at this phase point, due to the influence of noise, the calculated CDP It cannot accurately reflect the frequency offset, but it will cause error correction, which seriously affects the performance of multipath search
[0014] In practical applications, the above scheme has the following problems: inaccurate frequency offset estimation at some phase points will lead to unreasonable AFC technology, affect the accuracy of multipath search and judgment, and reduce the multipath processing performance of the system
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[0057] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0058] The present invention provides an automatic frequency control method in a code division multiple access mobile communication system, which uses a rough search method to determine several candidate path signal phase points from all phase points, and performs AFC frequency offset estimation on these phase points And correction, so that the non-path signal phase point will not affect the accuracy of the estimation.
[0059] Firstly, the problem is modeled mathematically, and then the specific process of the present invention is explained.
[0060] Suppose the discrete sequence of the correlation signal can be expressed as c(n), n=1, 2, 3,..., N c , where n represents the serial number of the sequence, N c is the sequence length of the relevant signal; and th...
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This invention refers to CDMA communication method and discloses a automatic frequency control method in CDMA mobile communication system to raise frequency deviation estimation precision and improve multi-route search and judgment property, which contains calculating sub composite time delay spectrum, dividing calculating coherent accumulated value sequence and power time delay point, searching roughly alternate route phase point, calculating frequency deviation estimation value of alternate route phase position.
Description
technical field [0001] The invention relates to a code division multiple access mobile communication method, in particular to automatic frequency control in a code division multiple access mobile communication system. Background technique [0002] The third-generation mobile communication system is able to meet the International Mobile Telecommunications 2000 (IMT-2000 for short) / Future Public Land Mobile Telephone Systems (FPLMTS for short) proposed by the International Telecommunication Union. The standard new-generation mobile communication system requires good network compatibility and the ability to roam between multiple different systems around the world. It must not only provide voice and low-rate data services for mobile users, but also provide a wide range of multimedia services. . According to this standard, wide-band code division multiple access (WCDMA for short), Cdma2000, time division synchronous code division multiple access (Time Division Synchronous Code D...
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IPC IPC(8): H04J13/02H04B7/005
Inventor 魏立梅
Owner 南通誉力智能装备有限公司