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Spectrum interference canceling device, system and method for dual-mode communication system

A communication system and spectrum interference technology, applied in the fields of digital signal processing and spectrum interference cancellation devices, can solve the problems of spread spectrum signal coverage and capacity reduction, complex nonlinear filtering calculation, etc., to ensure coverage and capacity, reduce The amount of signal-to-noise ratio loss and the effect of improving system performance

Inactive Publication Date: 2014-03-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with linear predictive adaptive filtering, nonlinear predictive adaptive filtering has greatly improved the signal-to-noise ratio, but the calculation amount of nonlinear filtering is very complicated.
For linear filtering, there is a time-domain interference suppression technology based on linear prediction of filter banks in the prior art. This method can effectively suppress interference without prior knowledge of too many interference signals, but the prediction The value contains part of the spread spectrum signal information, while suppressing the interference, it also suppresses the useful spread spectrum signal
Therefore, to a certain extent, the coverage and capacity of spread spectrum signals are reduced

Method used

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  • Spectrum interference canceling device, system and method for dual-mode communication system
  • Spectrum interference canceling device, system and method for dual-mode communication system
  • Spectrum interference canceling device, system and method for dual-mode communication system

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Experimental program
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Embodiment 1

[0072] Such as Figure 4 As shown, the interference signal baseband demodulation module includes a first frequency shift submodule, a low-pass filter submodule, a digital down-conversion submodule, a demodulation submodule, a data storage submodule, and a decoding submodule connected in sequence to The received GSM&UMTS spectral overlap signal is sequentially subjected to first frequency shift processing, low-pass filter processing, digital down-conversion processing, demodulation processing, data storage, and decoding processing to obtain the interference baseband signal;

[0073] There are many ways to demodulate the baseband of the interference signal. Here, we describe one of the demodulation methods in detail. The specific method is as follows:

[0074] The first frequency shifting sub-module is used for receiving GSM&UMTS spectrum overlapping signals, and performing the first frequency shifting processing. The specific operation is: according to the carrier position of th...

Embodiment 2

[0094] Such as Figure 5 As shown, the interference signal reconstruction module includes a third branch and a fourth branch. The third branch includes sequentially connected delay submodules and channel estimation submodules; the fourth branch includes sequentially connected encoding submodules and modulation submodules;

[0095] The coding submodule encodes the GSM interference baseband signal to obtain a GSM interference coded signal, and the modulation submodule modulates the GSM interference coded signal to obtain a GSM interference modulation signal; the specific process is:

[0096] The encoding sub-module encodes the GSM interference baseband signal, performs intra-frame interleaving and block interleaving between different encoding blocks. As for the coding blocks between different users, they are allocated to a burst time slot through block interleaving. After being processed by the coding sub-module, we get the GSM interference coded signal. In fact, the GSM inter...

Embodiment 3

[0109] Such as Image 6 As shown, the interference reconstruction filtering sub-module specifically includes a filter coefficient estimation unit, a filter coefficient adjustment unit, a power estimation unit, a noise estimation unit, and a reconstruction filtering unit.

[0110]The filter coefficient estimation unit utilizes the pilot information of the received GSM interference demodulation signal and the pilot information of the GSM interference estimation signal to estimate the channel response to obtain the filter estimation coefficient; the specific method is: according to The burst training sequence of the received GSM interference demodulation signal constructs a training matrix T, T is a (N-L)×L-dimensional training matrix, where N is the length of the burst training sequence of the GSM interference demodulation signal, and L is the channel dispersion length. r is to cache a set of GSM interference estimation signals with a length of N, namely And with the correspo...

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Abstract

The disclosure provides a spectral interference cancellation method, a spectral interference cancellation system and a spectral interference cancellation device for a dual-mode communication system. The method comprises: a receiver receiving a spectral overlapping signal, performing interference signal baseband demodulation and interference signal reconstruction processing on the spectral overlapping signal to reconstruct an interference filtered signal, and performing interference cancellation processing on the interference filtered signal with the delayed spectral overlapping signal. The device comprises: an interference cancellation module, an interference signal baseband demodulation module and an interference signal reconstruction module, wherein the interference signal baseband demodulation module is configured to demodulate out an interference baseband signal according to a spectral overlapping signal; the interference signal reconstruction module reconstructs an interference filtered signal using the interference baseband signal; the interference cancellation module performs, using the interference filtered signal, interference cancellation processing on the spectral overlapping signal processed by a delay module, to obtain a spread-spectrum filtered signal. The disclosure reduces loss of Signal-to-Noise Ratio (SNR) of useful information in a spread-spectrum signal during the process of spectral interference processing, and improves the system performance of a spread-spectrum signal receiver.

Description

technical field [0001] The present invention relates to digital signal processing in the field of mobile communication, and more specifically, to a spectrum interference cancellation device, system and method for a dual-mode communication system. Background technique [0002] In the future 4G era, 2G, 3G and LTE will coexist for a long time. As spectrum resources become more and more scarce, operators expect to deploy GSM&UMTS, GSM&CDMA and GSM<E networks simultaneously within the limited spectrum range in order to maximize spectrum utilization . However, such a deployment will cause signal spectrum overlap between different systems, which will cause mutual interference between uplink and downlink received signals, serious coverage and capacity shrinkage, and more serious system unavailability. Therefore, it is necessary to cancel the spectrum overlapping signals deal with. [0003] In a mobile communication system, the usual frequency spectrum overlapping interference c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7107H04L25/03
CPCH04B1/7107H04L25/02H04B1/71H04J2211/003H04L25/03178H04J11/004H04J11/0066H04L25/0204
Inventor 游爱民杨泽亮宗柏青
Owner ZTE CORP
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