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Parallel decision feedback balance method and device based on initial parameter passing

A technology of decision feedback equalization and equalization method, which is applied to baseband system components, shaping networks in transmitters/receivers, etc., and can solve problems such as limited accuracy and high training complexity

Inactive Publication Date: 2014-10-15
王红星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a low-complexity multi-channel orthogonal modulation signal decision feedback equalization method for the problems of limited accuracy of linear equalization methods and high training complexity of traditional decision feedback equalization methods for multi-channel orthogonal modulation signals

Method used

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  • Parallel decision feedback balance method and device based on initial parameter passing
  • Parallel decision feedback balance method and device based on initial parameter passing
  • Parallel decision feedback balance method and device based on initial parameter passing

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Embodiment 1

[0053] Design requirements: Under FIR channel conditions, the influence of non-ideal characteristics of the channel is compensated, and the convergence characteristics and error performance are greatly improved compared with the existing linear equalization method and general decision feedback equalization method. The method is applicable to multiple orthogonal modulation signals such as OFDM modulation signal and PSWF-based orthogonal pulse modulation signal. Here, the method is described by taking multiple time-domain quadrature PSWF modulated signals as an example.

[0054] The frequency band of time-domain quadrature PSWF modulation signal is [17~19]GHz, the symbol period is 4.5ns, and the number of parallel channels is 16. channel coefficient , using the present invention, the equalizer order is , , the initial center tap coefficient is 0.1, the rest are 0, the step size is 0.015, both the feedforward and feedback filters use the symbol rate, p =10. In the converg...

Embodiment 2

[0074] A realization device of the equalization method is given here, the basic structure of the device is as follows Image 6 shown. The device is composed of five types of modules including a correlator, a pre-filter bank, a feedback filter bank, a symbol detector and a parallel-to-serial converter. The correlator is used to correlate the received signal with the local template pulse group, and each pulse obtains an output. The outputs obtained by the correlator are respectively input into the filter. The feed-forward filter and the feedback filter are used to filter the output of the correlator, so that the absolute value of the symbol error obtained by the decision is minimized. A sign detector is used to make a decision on the output of the filter. The parallel-to-serial converter is used to perform parallel-to-serial conversion on the output of each symbol detector to obtain the final demodulated data.

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Abstract

The invention discloses a time domain balance method for a plurality of paths of orthogonal modulation signals. The method is implemented through a plurality of decision feedback balancers having the same structures. The decision feedback balancers construct a balancer group, wherein the number of the decision feedback balancers is the same as the number of paths of orthogonal modulation signals; each decision feedback balancer consists of a feed-forward filter, a feedback filter and a symbol detector. The method comprises the following steps: receiving a training sequence by using one of the decision feedback balancers, performing initial parameter iteration training, transmitting the coefficient of the feed-forward filter to the remaining feed-forward filters when a mode switching condition is satisfied, and transmitting the coefficient of the feedback filter to the remaining parallel feedback filters to rapidly realize initialization of all decision feedback balancers; switching the balancer group from a training mode to a decision guide mode, and entering a tracking stage; at the tracking stage, performing further iteration on parameters by adopting a decision directed algorithm independent of the training sequence till convergence; in the process, performing parameter adjustment through each decision feedback balancer according to a modulation signal passing through a channel.

Description

technical field [0001] The invention relates to an adaptive equalization method in radio communication, in particular to an equalization method for multi-channel orthogonal modulation signals. Background technique [0002] The multi-channel information transmission method uses multiple mutually orthogonal modulation signals to transmit information at the same time, which can effectively improve the effectiveness of the communication system. Orthogonal Frequency-Division Multiplexing (OFDM), which is widely used at present, is a typical multiplex transmission method. The non-sinusoidal time-domain quadrature modulation method uses multi-channel ellipsoidal wave function (Prolate Spheroidal Wave Functions, referred to as PSWF) pulse groups that are orthogonal in time domain and overlapped in spectrum to transmit information, and demodulate information by using the orthogonality between pulse groups , has the advantages of high spectrum utilization and high power utilization (...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 王红星钟佩琳苏伟陈昭男
Owner 王红星
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