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Pilot interference cancellation method of code division multiple address system

An interference cancellation and system pilot technology, applied in the field of transmission business, can solve problems such as user traffic channel multiple access interference, and achieve the effects of improving reception performance, eliminating multiple access interference, and overcoming accuracy improvement.

Inactive Publication Date: 2002-09-04
SOUTHEAST UNIV +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the accuracy of channel parameter estimation, the transmission power of the pilot channel is usually higher than that of the user traffic channel, which will cause additional multiple access interference to the user traffic channel

Method used

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  • Pilot interference cancellation method of code division multiple address system
  • Pilot interference cancellation method of code division multiple address system
  • Pilot interference cancellation method of code division multiple address system

Examples

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Embodiment Construction

[0019] The invention consists of two parts: pilot interference cancellation and RAKE reception. The first part is an additional part unique to the present invention, mainly including a pilot interference cancellation module (A100) and the like. The second part is a RAKE receiver in the general sense, including a channel parameter estimator module (B100), an effective arrival path selector module (B101), a RAKE demodulation and maximum ratio combining module (B102) and a local spread spectrum sequence generator Module (B103), etc. The two parts are combined to complete the pilot interference cancellation function and the spread spectrum receiving function required by the present invention, which can effectively overcome the system performance degradation caused by the additional multiple access interference introduced by the pilot channel in the traditional RAKE receiver.

[0020] Combine below figure 1 Each component of the present invention is described in further detail. ...

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Abstract

A method to counterbalance pilot frequency interference in code division multiple address system is method which can carries on consolidated receiving of multipath signal and also can counterbalance multiple addrss interference caused by pilot frequency channel in each path of signal. First, it uses channel coefficient estimator to obtain the estimation value of time varying multipath fading channel coefficient, and then, to use pilot frequency counterbalancing calculation to calculate out multipe address interference caused by pilot frequency channel on the strengest pass and to eliminate itout from receiving signal. The device includes channel coefficient estimator module, effective arrival path selector module, maximal ratio combining module, to be connected in series by sequence, of which the output ends of channel coefficient estimator module, effective arrival path selector module, maximal ratio combining module and local spread spectrum sequence creator module with be all connected with input end of pilot frequency channel interference counterbalancing module. The input end of base band sampling signal will be an input end of the device and to be connected with input ends of channel coefficient estimator module and maximal ratio combining module separately.

Description

1. Technical field: [0001] The invention is used in the field of voice and data transmission business in CDMA (Code Division Multiple Access) cellular communication system. 2. Background technology: [0002] Compared with FDMA (Frequency Division Multiple Access) and TDMA (Time Division Multiple Access) technologies, CDMA cellular communication technology has the characteristics of unique soft capacity, soft handover, macro diversity, same frequency coverage and flexible variable rate transmission, etc. The mainstream of the third generation mobile communication wireless transmission technology. [0003] There is multipath fading phenomenon in the mobile communication system, which will cause serious multipath interference. In the CDMA cellular mobile communication system using spread spectrum technology, the pilot (Pilot) channel is used to transmit the pilot sequence with definite information, not only for system timing, carrier extraction and handover, etc., but also for...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B1/10
Inventor 尤肖虎陈玉许昌龙赵春明蒋良成贾可
Owner SOUTHEAST UNIV
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