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Turbo time domain equalization method for short-wave communication

A time-domain equalization, short-wave communication technology, applied in the direction of shaping network, baseband system, digital transmission system in transmitter/receiver, etc., can solve the problems of complex calculation and unfavorable engineering

Inactive Publication Date: 2019-12-13
西安烽火电子科技有限责任公司
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Problems solved by technology

However, this algorithm involves a large number of logarithmic and multiplication operations, and the complexity of the operation will increase exponentially with the memory length of the channel and the order of the modulation. The operation is complicated, which is not conducive to engineering implementation.

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  • Turbo time domain equalization method for short-wave communication
  • Turbo time domain equalization method for short-wave communication
  • Turbo time domain equalization method for short-wave communication

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Embodiment Construction

[0057] The embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0058] refer to figure 1 , a Turbo time-domain equalization method for short-wave communication, which uses an iterative method for equalization. First, use the MMSE equalizer to equalize the received signal; second, input it to the decoder for decoding; then, use the output soft information L of the decoder to out (b) to construct average information and variance information Using the Out-of-Variance Information Matrix Calculate the transversal filter tap coefficients at the jth moment; combine known multipath channel parameters and averaged external information to simulate the received signal Thus, an estimate of the signal is obtained; finally, the MMSE equalizer utilizes the analog received signal and the real received signal r to equalize the multipath signal again.

[0059] It should be noted, figure 1 The me...

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Abstract

The invention discloses a Turbo time domain equalization method for short-wave communication, and the method comprises the steps: firstly carrying out the equalization of a received signal through anMMSE equalizer; inputting the data into a decoder for decoding; constructing average information and variance information by utilizing soft information output by a decoder; calculating a transverse filter tap coefficient at the jth moment by utilizing the variance extrinsic information matrix; simulating a received signal in combination with known multipath channel parameters and average extrinsicinformation so as to obtain estimation of the signal; and finally, enabling the MMSE equalizer to equalize the multipath signal again by using the analog receiving signal r and the real receiving signal r. According to the method, complex matrix inversion operation in a time domain algorithm is avoided, the processing complexity of iterative equalization is effectively reduced, linear and nonlinear interference can be eliminated at the same time on the premise that the equalization performance is not reduced, and the calculation complexity can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of short-wave communication, and in particular relates to a turbo time-domain equalization method for short-wave communication. Background technique [0002] For wireless channels, multipath propagation, fast-changing frequency selectivity, and time-selective fading are the main factors that cause distortion of the transmitted signal. The channel impulse response will introduce intersymbol interference, which will severely damage the received signal. An equalizer is used in the receiver to eliminate the influence of intersymbol interference, and then decode. Turbo equalization is a technology that repeatedly iterates equalization and decoding for data detection. With its characteristics of random coding and iterative decoding, it has achieved excellent performance close to the Shannon limit, and has become the main equalizer used in short-wave communication. [0003] In the classic Turbo equalization algori...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
CPCH04L25/03012H04L25/03878H04L2025/03611H04L2025/03636
Inventor 张健张凯邱利利王小军牛磊冯永乾王鹏阎旭
Owner 西安烽火电子科技有限责任公司
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