Method for multichannel echo cancellation of LTE (Long Term Evolution) relay system
An echo cancellation and relay system technology, applied in transmission systems, baseband system components, radio transmission systems, etc., can solve problems such as lack of universality, weakening the strong correlation of multiple input signals, and achieve a degree of complexity. low effect
Inactive Publication Date: 2014-08-13
HEBEI UNIV OF TECH +1
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[0003] According to the literature search, the existing technologies for echo cancellation to solve the self-excited interference mentioned above are: (1) Gao Ying et al. April) In this paper, several preprocessing methods are introduced to weaken the strong correlation between multiple input signals. After that, the existing multi-channel echo cancellation adaptive algorithm is reviewed in detail, and The characteristics of various algorithms are expounded. This paper expounds that the echo cancellation that is only applicable to the voice channel is not universal; (2) Hao Luguo et al. TV" 2009, Volume 33) reported that it designed and verified a method for effective echo cancellation in digital repeaters, but the echo cancellation process in this digital repeater is single-channel processing, only It is applicable to the situation where the antenna of the repeater station sends and receives only one, and is not universal; (3) Xiao Shanghui et al. in "A Simplified Adaptive Echo Cancellation Algorithm and Its Application Analysis" (see "Communication Technology" 2009 No. 2 ) proposed a simplified frequency-domain FDAF-MDFTP algorithm for acoustic echo cancellation based on adaptive filtering technology, and analyzed the characteristics of the algorithm and its influence on the increase of acoustic echo return loss
This method uses the frequency domain algorithm, which has a good effect on indoor acoustic echo cancellation, but it also has certain limitations and is not universal
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[0050] Carry out emulation test with LTE digital relay multi-channel echo cancellation method of the present invention, adopt as above-mentioned figure 1 The above-mentioned two-way echo canceling model of the antenna with two transmissions and one reception. The transmitting end of the LTE digital relay system transmits two signals processed by the half-wave rectification function through dual antennas x 1 (n) and x 2 (n), the two signals x 1 (n) and x 2 (n) On the one hand, the echo channel H(n) is received by the antenna of the receiving end, forming two echo interference X(n)*H(n), and the base station source signal s(n) received by the LTE digital relay system n) form the mixed signal Data(n) and enter the LTE digital relay system; on the other hand, the two-way signal x of the LTE digital relay system transmitter 1 (n) and x 2 (n) After delay processing, enter two FIRs that have been designed as estimators for estimating echo signals 1 and FIR 2 The filter enters ...
Embodiment 2
[0075] Except that the upper bound inequality condition for obtaining the step size parameter is: 0<γ<2, the others are the same as in Embodiment 1.
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The invention discloses a method for the multichannel echo cancellation of an LTE (Long Term Evolution) relay system, and relates to service and facilities applicable to wireless communication networks. The method comprises steps as follows: an antenna-double-transmitting single-receiving two-channel-echo cancellation model is adopted; two-channel signals, which are preprocessed at a transmitting terminal of the LTE relay system, are received by a receiving antenna through an echo channel; two-channel echo signals are estimated by a self-adapting filter at a receiving terminal; subtraction is carried out on the received composite signals and the estimated signals; and then, the effect of echo cancellation is achieved. The method disclosed by the invention is applied to wireless communication, the problem of how to effectively eliminate multichannel echo disturbance at the receiving terminal is solved, the normal work of the whole relay system is then guaranteed, the relay system can then be effectively applied to the mobile communication field of a next generation, and a technical reserve for the mobile communication of a new generation is achieved according to the protocol standards of LTE and LTE-A (Long Term Evolution-Advanced).
Description
technical field [0001] The technical solution of the present invention relates to a service or facility applicable to a wireless communication network, specifically a method for canceling multiple echoes in an LTE relay system. Background technique [0002] In the LTE relay system, the signal sent from the transmitting antenna is received and reprocessed by the receiving antenna. This cycle of sending, receiving, and reprocessing makes the power of the signal continuously amplified, forming self-excited interference, and seriously damaging the power amplifier. In order to avoid self-excited Interference requires reception filtering of the channel sent from the system, that is, echo cancellation. [0003] According to the literature search, the existing technologies for echo cancellation to solve the self-excited interference mentioned above are: (1) Gao Ying et al. April) In this paper, several preprocessing methods are introduced to weaken the strong correlation between mu...
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IPC IPC(8): H04L25/03H04B17/14H04B15/00
CPCH04B7/15585
Inventor曾祥烨韩凯刘剑飞王蒙军杨建坡
OwnerHEBEI UNIV OF TECH