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A self-adapted method for setting protection interval of overlapping cutting method

A guard interval, adaptive technology, applied in the direction of selection device, communication between multiple stations, radio/induction link selection arrangement, etc., can solve the position where the bit error rate cannot be well reduced, and the guard interval cannot be set And length and other issues, to achieve good application prospects, reduce computational complexity, reduce the effect of bit error rate

Inactive Publication Date: 2008-06-04
ZTE CORP
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AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for adaptively setting the guard interval of the overlapping shearing method, so as to improve the existing OC method that cannot set the position and length of the guard interval according to the system error distribution, and cannot be well The problem of reducing the bit error rate

Method used

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  • A self-adapted method for setting protection interval of overlapping cutting method
  • A self-adapted method for setting protection interval of overlapping cutting method
  • A self-adapted method for setting protection interval of overlapping cutting method

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Embodiment Construction

[0040] By analyzing the system error distribution characteristics of the OC method, the method of the invention is suitable for the frequency domain equalizer for the CDMA downlink channel, and can improve the performance of the frequency domain equalizer while maintaining low complexity.

[0041] The frequency domain equalization of the CDMA system is a chip-level channel equalization process. Discrete multipath channels can be modeled with a tapped delay line. The impulse response of the channel can be expressed as: h=[h 0 , h 1 ,...,h L-2 , h L-1 ] T , L represents the length of the discrete multipath channel, and T represents the transpose of the vector. In a multi-user synchronous CDMA system, the combined signals of all users sent by the base station can be expressed as: x=[x 0 , x 1 ,...,x N-2 , x N-1 ] T , N is the length of the block, that is, the length of the sampling sequence. Then the signal received by the mobile station can be expressed as:

[0042] ...

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Abstract

The invention discloses a method for protecting interval by adopting an adaptive set overlapping shearing approach. A transmitting end sends given data of a receiving end. The receiving end receives the data and calculates the data error to determine the location and length of frequency domain equalization protection interval. The invention further discloses a method for protecting interval by adopting an adaptive set overlapping shearing approach. If the SNR is smaller than the preset SNR threshold value, the protection interval is set as 0; otherwise, the transmitting end sends given data of the receiving end and the receiving end receives the data to calculate the data error and determine frequency domain equalization protection interval. The invention can effectively reduce bit error rate and further reduce the operation complexity of the frequency domain equalizer while the system performance is not reduced.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method for adaptively setting a guard interval of an overlapping clipping method in frequency domain equalization technology. Background technique [0002] RAKE receiving technology is the most commonly used receiving technology in CDMA system. It detects all resolvable multipath diversity and combines the multipath components with maximum ratio. The performance of the RAKE receiver will be optimal if the orthogonality of the spreading codes can be maintained. However, because the multipath propagation of the wireless channel destroys the orthogonality of the spreading code, the performance of the RAKE receiver is affected by Multiple Access Interference (MAI). In a cell with many access users, the RAKE receiver The performance of the machine will be greatly reduced. [0003] Related improved technologies include multi-user detection technology, which uses the information ...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B17/00H04Q7/34H04B7/26
CPCH04B1/7107H04L25/03312H04L25/03159H04L2025/03414H04B1/71072H04B1/7105
Inventor 许国平辛雨曹蕾吴交魏群张欣
Owner ZTE CORP
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