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Low-complexity frequency domain implementation method for combined frequency domain equalization interference elimination detection algorithm

A frequency domain equalization and interference cancellation technology, applied in the field of multi-user detection

Inactive Publication Date: 2008-07-02
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, regardless of the combination, the essence is similar, namely: the MAI needs to be reconstructed and deleted at each iterative level of interference cancellation

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  • Low-complexity frequency domain implementation method for combined frequency domain equalization interference elimination detection algorithm
  • Low-complexity frequency domain implementation method for combined frequency domain equalization interference elimination detection algorithm
  • Low-complexity frequency domain implementation method for combined frequency domain equalization interference elimination detection algorithm

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Embodiment Construction

[0063] The new frequency-domain implementation method of frequency-domain equalization combined with PIC detection algorithm based on overlapping clipping method consists of two parts. The first part is the same as the traditional time-domain implementation method mentioned above, so it will not be described in detail here. The implementation principle of the new frequency domain implementation method at each iteration level of interference cancellation will be described mainly in combination with the previous system model. Figure 4 shows the structure of the new frequency domain implementation method of frequency domain equalization combined with PIC detection algorithm based on overlapping clipping method at the jth iteration level. Its specific implementation steps are as follows:

[0064] (a) In the jth (j=1, 2, ..., J)th iteration stage, first, according to Fig. 2, the reconstructed transmission signal that does not include the kth user data information Overlap cut into...

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Abstract

The invention relates to a multi-user detection algorithm of frequency domain equalization combined with interference cancellation based on an overlapping shearing method in a mobile communication system of code division multiple access (CDMA). The method applies the concept of overlapping shearing to change a reconstruction method of multiple address interference (MAI) in each iterated level of interference cancellation from a traditional linear convolution of time domain into multiplication of frequency domain, and cancels the reconstructed MAI from data blocks of overlapping shearing in frequency domain of total received signals finished in the frequency domain, thus greatly reducing the complexity of multi-user detection algorithm of frequency domain equalization combined with interference cancellation based on the overlapping shearing method and keeping the outstanding detection performance in channels with fading frequency option of the algorithm.

Description

technical field [0001] The invention relates to the technical field of multi-user detection in a code division multiple access (Code Division Multiple Access, CDMA) mobile communication system, in particular to a frequency domain equalization joint interference elimination detection algorithm in the CDMA system. Background technique [0002] CDMA technology is the mainstream technology in the third generation mobile communication system. Compared with the traditional FDMA and TDMA systems, the CDMA system has the advantages of simple frequency planning, soft capacity, good security, easy seamless handover and macro diversity. However, the CDMA system has the problem of limited capacity caused by multiple access interference, especially when the spread spectrum signal passes through the frequency selective fading channel, because the multipath delay destroys the orthogonality between the spread spectrum codes, the CDMA system Serious inter-chip interference (Inter-chip Inter...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L25/03H04B1/7105
Inventor 曹蕾张欣杨大成
Owner BEIJING UNIV OF POSTS & TELECOMM