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System and method for iteratively cancelling interference based on cross correlation and least mean square (LMS)

A technology that eliminates systems and cross-correlations, and is applied in baseband system components, shaping networks in transmitters/receivers, etc., and can solve problems such as increased cost and increased construction difficulty.

Active Publication Date: 2011-05-25
福建京奥通信技术有限公司
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Problems solved by technology

No matter which method is adopted, the above measures will make the construction more difficult and the cost will increase significantly

Method used

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  • System and method for iteratively cancelling interference based on cross correlation and least mean square (LMS)
  • System and method for iteratively cancelling interference based on cross correlation and least mean square (LMS)
  • System and method for iteratively cancelling interference based on cross correlation and least mean square (LMS)

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Embodiment Construction

[0108] Embodiment, see Fig. 1 shown, figure 1 Only the case of one carrier frequency is given.

[0109] A kind of interference iterative elimination system based on cross-correlation and LMS of the present invention comprises:

[0110] An analog-to-digital conversion processing unit 11, which is used to digitize the analog intermediate frequency signal;

[0111] A first complex frequency mixing processing unit 12, which is used to generate the required frequency and perform channel mixing;

[0112] A digital down-conversion processing unit 13, which is used for channel extraction and filtering;

[0113] an LMS processing unit 2: it is used for adaptive echo cancellation processing;

[0114] A digital up-conversion processing unit 14, which is used for up-converting the low-rate baseband signal to an intermediate frequency;

[0115] A second complex frequency mixing processing unit 15, which is used to generate the required frequency and perform channel mixing;

[0116] A ...

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Abstract

The invention discloses a system and method for iteratively cancelling interference based on cross correlation and least mean square (LMS). The system comprises an analog to digital conversion processing unit, a first complex / hybrid frequency processing unit, a digital down-conversion processing unit, an LMS processing unit, a digital up-conversion processing unit, a second complex / hybrid frequency processing unit and a digital to analog conversion processing unit. The system and the method have the following beneficial effects: in the LMS processing unit, the cross correlation technology is adopted to estimate echo delay and the LMS algorithm is adopted to estimate echo gain, thus cancelling the interference signals in the working bands, effectively solving several problems caused by feedback interference from service antennas to link antennas in repeaters, avoiding self excitation of the repeaters and deterioration of signal quality and reducing the installation requirements of wireless repeater engineering.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a system and method for iteratively eliminating interference signals of WCDMA signals of wireless same-frequency repeaters based on cross-correlation and LMS technology. Background technique [0002] In a conventional wireless co-frequency repeater, its donor antenna will inevitably receive the signals sent by the retransmitting antenna under the condition of limited isolation. The work causes interference and affects the waveform quality of the repeater. When the feedback signal is greater than the antenna isolation, it will cause the repeater to self-excite. The frequency of the repeater is the working frequency of the repeater itself, so this kind of interference cannot be processed in the frequency domain by conventional filtering. [0003] In order to solve this self-excited interference, the following two measures are generally adopted in the prior art: one is to in...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 邹泰华卓开泳康忠林谢东福叶天宝林兴元
Owner 福建京奥通信技术有限公司
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