Downstream link receiving method for counteracting downstream common channel interference after deexpansion
A common channel and receiving method technology, which is applied in cellular mobile communication, fixed wireless access, and CDMA communication downlink reception, can solve problems such as impact on service channel reception effect, interference, multiple access interference of downlink service channels, etc., to increase the complexity of implementation degree, offset interference, and improve the effect of receiving quality
Inactive Publication Date: 2004-02-11
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 the synchronous orthogonal code method 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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[0067] Preferred embodiments of the present invention will be combined with the attached figure 2 And attached image 3 The details are as follows.
[0068] attached figure 2 What is described in is the case that a certain path of the desired channel only offsets a certain path (preferably the strongest path) of several common interference channels. attached image 3 yes attached figure 2 A further description of the device for generating an interference term of a certain path of a downlink common interference channel.
[0069] Assuming that the required prerequisites are met, the appended figure 2 , with image 3 The operation process in the middle is explained as follows:
[0070] (1) B performs conventional despreading of the input signal on the desired channel, that is, using all
[0071] The spread spectrum scrambling code sequence of the channel is required to perform conventional correlation operations on the input signal, and we get
[0072] to the des...
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A receiving method of down link line with counter balancing the disturbance in down common channel after expansibility releasing has the basic principle as to deduct the disturbance item in the common disturbance channel after the routine correlation expansibility releasing in required channel and to use this differential signal as a final result of expansibility releasing in the required channel. The present invention can raise the receiving performance of required signal to raise the whole system performance for the code division multiple access down receiving mode.
Description
(1) Technical field: [0001] The invention belongs to the technical field of code division multiple access (CDMA) communication, including cellular mobile communication and fixed wireless access. [0002] The invention particularly relates to a downlink receiving method for canceling 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 without increasing the complexity of realization. (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 a basic / auxiliary-common control channel, a continuous pilot channel, a primary / auxiliary-synchronization channel, and a downlink shared channel. For CDMA20...
Claims
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IPC IPC(8): H04B1/707
Inventor 张效义于宏毅胡捍英刘正军
Owner INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND