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Down link receiving method for cancelling interference of common down channel before despreading

A common channel and downlink technology, which is applied in the downlink reception mode of CDMA communication, cellular mobile communication and fixed wireless access, and the field of downlink reception mode. Interference and other issues to achieve the effect of improving the quality of reception and increasing the complexity of implementation

Inactive Publication Date: 2002-05-01
INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND +1
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Problems solved by technology

[0004] Although the addition of downlink common channels in code division multiple access communication enables user stations to access the network conveniently and efficiently, it also brings multiple access interference to other downlink traffic channels
Even if the downlink uses synchronous orthogonal codes to distinguish these channels, due to the influence of multipath effects, this interference will still exist
Moreover, the power of public channels is often relatively strong, so this kind of interference has a bad influence on the receiving effect of business channels

Method used

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  • Down link receiving method for cancelling interference of common down channel before despreading

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Embodiment Construction

[0042] Specific embodiments of the present invention will combine figure 1 The details are as follows.

[0043] figure 1 The receiving method for single-path cancellation of downlink common channel interference is described, which only cancels the interference item of one path of the common interference channel.

[0044] The method steps are as follows:

[0045] (1) implement despreading to each common interference channel to be canceled;

[0046] (2) Obtain information symbol estimation and complex gain estimation value of each common interference channel;

[0047] (3) spreading the information symbol value with its corresponding spreading code;

[0048] (4) The result of channel gain multiplied by (3) reconstructs the signals after spreading of these common interference channels;

[0049] (5) Subtract these reconstructed common channel spread spectrum signals from the time alignment of the received signal to obtain the desired signal before despreading.

[0050] The in...

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Abstract

A down channel receiving method for cancelling the interference of common channel in CDMA communication is characterized by that before despreading the term increased by common channel is substrated from the received signal of needed channel and the differential signal is used as the judge basis of transmitting information in needed channel. It can improve the receiving performance of needed signal and the system performance.

Description

(1) Technical field: [0001] The invention belongs to the field of code division multiple access (CDMA) communication, including cellular mobile communication and fixed wireless access. [0002] The invention relates to a downlink receiving method for offsetting common channel interference, and is a brand-new downlink receiving method for CDMA communication. The receiving method can improve the receiving performance of the required channel almost without increasing the implementation complexity. (two) background technology: [0003] Any CDMA communication system must add some common control and common traffic channels in the downlink in order to guide the work of subscriber stations or improve transmission efficiency. In the WCDMA standard of the third-generation mobile communication 3GPP, the downlink has basic / auxiliary-common control channels, continuous pilot channels, primary / auxiliary-synchronization channels, and downlink shared channels. For CDMA2000, there are simil...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B1/10H04B1/7103
Inventor 于宏毅张效义胡捍英刘正军
Owner INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND
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