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Adaptive W-CDMA coherent reception method and receiver for third generation mobile communication

A coherent receiver, W-CDMA technology, applied in the direction of multiplexing communication, code division multiplexing system, electrical components, etc., can solve the problem of not being able to adapt to the low radio frequency stability of mobile stations, and achieve radio frequency stability The degree is not high, the system performance is improved, and the demodulation signal-to-noise ratio is improved

Inactive Publication Date: 2002-01-23
INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND +1
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AI Technical Summary

Problems solved by technology

This coherent receiving method adopts a fixed structure, which cannot adapt to the high data rate transmission under the condition that the radio frequency stability of the mobile station is not high, the mobile station moves at variable speed, or the wireless channel has significant non-stationary characteristics.

Method used

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  • Adaptive W-CDMA coherent reception method and receiver for third generation mobile communication
  • Adaptive W-CDMA coherent reception method and receiver for third generation mobile communication

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Embodiment Construction

[0017] The preferred embodiment of the invention is illustrated below in conjunction with the accompanying drawings:

[0018] like Figure 1 Show:

[0019] For the convenience of description, the following agreement is made: the scrambling code S of the main common pilot channel P , the channelization code C of the primary common pilot channel P ,, the scrambling code S of the user traffic channel D , the channelization code C of the user traffic channel D , the refresh period of the adaptive algorithm: T A .

[0020] Among them, 1 is the matched filter of the controllable integration length of the main common pilot channel, 2 is the matched filter of the traffic channel, 3 is the signal-to-noise ratio measuring device, 4 is the adaptive algorithm controller, 5 is the adaptive refresh clock, 6 is a time-division switch, 7 is a residual frequency difference measuring device, 8 is a multi-bit user data output, 9 is the signal-to-noise ratio Eb / It output by the signal-to-no...

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Abstract

The adaptive coherent reception method has the process including eliminating the effect of turbulence code and channel code in main common pilot frequency channel or uplink DPCCH, carrying out integration in some length SF to produce output bit, and measuring the S / N ratio; correlation receiving and measuring the residual frequency difference in the data stream after correlation receiving; and determining adaptively the integrating length SF of common pilot frequency channel or uplink DPCCH in the next period. The coherent receiver includes matching filter, S / N measurer, adaptive aglorithm controller, time shearing switch, adaptive refreshing clock, residual frequency different measurer, conjugating device and multiplier. The present invention has high demodulation S / N ratio, high stability of the demodulation S / N ratio, and improved system performance.

Description

(1) Technical field: [0001] The invention belongs to the technical field of wideband code division multiple access (W-CDMA) of the third generation mobile communication, and especially designs a W-CDMA self-adaptive coherent receiving method and receiver of the third generation mobile communication. (two) background technology: [0002] The Wideband Code Division Multiple Access (W-CDMA) spread spectrum communication method is one of the third generation mobile communication systems being realized at present. In addition to the excellent characteristics of anti-jamming, anti-multipath fading and large system capacity of the traditional CDMA system, it also adopts coherent reception in uplink and downlink, which has stronger adaptability to channels and further reduces the bit error rate. However, in the W-CDMA system, only automatic frequency control (AFC) can not completely eliminate the influence of frequency difference instability, Doppler frequency shift and channel rand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16H04J13/00
Inventor 朱近康张铎卫国邱玲
Owner INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND
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