Method for restraining multi-user interference inside intelligent antenna main wave bundle
A multi-user interference, smart antenna technology, applied in diversity/multi-antenna system, shaping network in transmitter/receiver, space transmit diversity, etc., can solve the problem of heavy task, complex structure and poor effect of mobile station and other problems, to achieve the effect of eliminating multi-user interference, improving system performance, and reducing computational complexity.
Inactive Publication Date: 2011-04-06
CHONGQING UNIV OF POSTS & TELECOMM
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In the prior art of the TD-SCDMA system, the multi-user detection technology is generally used in the mobile station to eliminate this interference through the smart antenna beamforming technology, but the mobile station needs to perform a large number of calculations and processing, which makes the mobile station heavy. The structure is more complex, and the effect of suppressing interference is not very good because the random movement of the mobile station has a great impact on the effect of multi-user detection
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[0007] According to the time division duplexing of TD-SCDMA, the uplink channel information of TD-SCDMA system is used as the expected value of downlink, and the weight vector is determined by the maximum expected power MDP criterion, and the channel information obtained by estimation and the determined weight vector are constructed The joint channel information is used to determine the modulation matrix of the transmitting end based on the joint channel information and the demodulation matrix of the receiving end based on the TxWF criterion. After the modulation matrix at the sending end modulates the data to be sent by the base station transmitter, it can eliminate the multi-user interference in the coverage area of the main beam of the smart antenna and improve the performance of the TD-SCDMA system.
[0008] attached figure 1 It is a processing flowchart of the present invention, specifically including the following implementation steps.
[0009] (1) Estimate the uplink...
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The invention applies for protecting a method to jointly restrain multiuser interference within intellectual antenna main beams based on the TxWF criteria and downgoing wave beam shaping, and relates to the technical field of the mobile communication. The technical proposal of the invention is that according to the time division duplexing property of TD-SCDM, the upstream channel of the TD-SCDMA system is used as the predicted value of the down link; the criteria to maximize expected power (MDP) is adopted to determine the weight vector of an intellectual antenna. The combined optimistic method of the TxWF criteria and downgoing wave beam shaping of the intellectual antenna is adopted at a sending end of a base station to determine the modulation matrices of the sending end, and the multiuser interference in the intellectual antenna main beam is reduced through the signal of the modulation matrix sending end. In addition, the JT technology is adopted at a base station end of the system; the complexity of a mobile station is reduced. By adopting the invention, the multiuser inference can be restricted, and the system performance can be improved.
Description
technical field [0001] The invention relates to wireless communication technology, in particular to a method for improving the performance of a TD-SCDMA system and suppressing interference. Background technique [0002] The performance of the TD-SCDMA system can be greatly improved through the smart antenna (SA) beamforming technology, but due to the limitation of the number of antennas and the complexity, the main beam width of the smart antenna is often more than ten degrees or even larger, so that the main beam There are often multiple users within the coverage area, which leads to multi-user interference. It is described in detail in the literature (Xie Xianzhong, TD-SCDMA third generation mobile communication system technology and implementation, June 2004, Electronic Industry Press). In the prior art of the TD-SCDMA system, the multi-user detection technology is generally used in the mobile station to eliminate this interference through the smart antenna beamforming t...
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IPC IPC(8): H04B7/04H04L25/03H04L1/00
Inventor 谢显中杨永记
Owner CHONGQING UNIV OF POSTS & TELECOMM