CN103457887A - Ultra wide band channel equalizer model established based on affine projection algorithm - Google Patents

Ultra wide band channel equalizer model established based on affine projection algorithm Download PDF

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CN103457887A
CN103457887A CN 201210180737 CN201210180737A CN103457887A CN 103457887 A CN103457887 A CN 103457887A CN 201210180737 CN201210180737 CN 201210180737 CN 201210180737 A CN201210180737 A CN 201210180737A CN 103457887 A CN103457887 A CN 103457887A
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equalizer
projection algorithm
affine projection
wide band
based
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CN 201210180737
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Chinese (zh)
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邓正宏
郑玉山
夏杰
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西安秦码软件科技有限公司
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Abstract

Provided is an ultra wide band channel equalizer model established based on an affine projection algorithm. Intersymbol interference in signal transmission is avoided, communication quality is improved, and an equalizer based on the affine projection algorithm (APA) is characterized in that a step length factor and a filter length are determined, so that system bit error rate is the lowest. First, a group of top-class parameter values can be obtained according to the performance simulation curve of the equalizer, then an SMULINK simulation platform is established for testing, and comparing with an LMS equalizer and an NLMS equalizer is carried out. Results show that the APA equalizer is effective, and certain performance can be maintained in a place with severe channel distortion.

Description

基于仿射投影算法构建超宽带信道均衡器模型 Construction of ultra-wideband channel equalizer model affine projection algorithm

技术领域 FIELD

[0001] 本发明专利属于无线通信技术领域,尤其是涉及一种基于仿射投影算法的信道均衡器模型。 Patent [0001] The technical field belonging to the wireless communications, and more particularly to a channel equalizer model based on the affine projection algorithm.

背景技术 Background technique

[0002] 均衡技术最早应用于无线电通信领域,主要用于消除信道响应引起的码间干扰。 [0002] equalization technology was first applied to the field of radio communication, the main channel response for canceling intersymbol interference caused. 目前,自适应滤波和计算机技术促进了自适应均衡技术的迅猛发展。 Currently, adaptive filtering and computer technology to promote the rapid development of adaptive equalization technology. 例如基于ISM算法的线性均衡器能够在工作环境变化时,自动调整相关参数以保持最佳的性能,在数字通信中得到了广泛应用;另外,基于LMS算法的判决反馈均衡器由于存在不爱噪声增益影响的反馈部分,不便于工程实现和应用。 ISM e.g. linear equalizer algorithm can be at work environment changes, automatically adjust the parameters to maintain optimum performance, it has been widely used in digital communication based; Further, the LMS algorithm based on the decision feedback equalizer is not due to the presence of noise love gain influence in the feedback section, not easy to achieve and engineering applications. 在高速无线通信系统中,多径传输引起的ISI较为严重,为了更好的减小形失真就需要研究性能更优的自适均衡器。 In high-speed wireless communication system, the ISI due to multipath propagation is more severe, in order to better reduce the need Performance-distortion better adaptive equalizer.

发明专利内容 SUMMARY patent

[0003] 数字通信系统中,由于多径传输、信道衰落等影响,在接收端会产生严重的码间干扰,增大误码率。 [0003] Digital communication systems, due to multipath transmission, channel fading and other factors, the receiving end will produce serious inter-symbol interference, the bit error rate is increased.

[0004] 为了克服上述码间干扰,提高通信系统的性能,在接收端采用基于仿射投影算法的均衡技术,用来减小或消除因信道的时变多径传播特性引起的码间干扰。 [0004] In order to overcome the inter-symbol interference and improve performance of the communication system, the receiving end based equalization technique affine projection algorithm, to reduce or eliminate inter-symbol by the time varying multipath channel propagation characteristics due to interference.

[0005] 基于仿射投影算法的均衡技术,采用了一种模型信道均衡系统模型。 [0005] equalization based on Affine projection algorithm, uses a channel equalization model system model.

[0006] 上述模型给出了基于自适应APA算法的信道均衡系统的仿真模型。 [0006] The model gives a channel equalization simulation model System Based on Adaptive Algorithm APA.

[0007] 上述数据发生器用于产生信道输入序列x(n),它是由{+1,-1}组成的双极性Bernoulli序列,经延迟后作为参考信号yd(n),均衡器的输出为,噪声发生器用来产生加性闻斯白噪声。 [0007] The data channel generator for generating the input sequence x (n), which is composed of {+1, -1} bipolar Bernoulli sequence composition, after delay as the reference signal yd (n), the output of the equalizer is, noise generator for generating audible additive white Gaussian noise.

[0008] 上述信道模块采用弥散信道模型,信道的单位脉冲响应表示为:hn =1/2X [l+cos(2 3i/WX (n-2))],其中,η = 1,2,3,其它值为O。 [0008] The channel modules dispersive channel model, the channel impulse response is expressed as units: hn = 1 / 2X [l + cos (2 3i / WX (n-2))], where, η = 1,2,3 , the other is O.

[0009] 上述脉冲为响应以η = 2对称,调整参数W可以改变信道特性。 [0009] In response to the pulse symmetry η = 2, W may be varied to adjust the parameters of the channel characteristics. W增大时,信道失真程度增大。 When W is increased, the degree of distortion in the channel is increased. 注意信号x(n)的延迟与信道和均衡器造成的总延迟要相等。 Note that the total delay signal x (n) with the delay caused by the channel and the equalizer to be equal.

[0010] 上述模型中,APA均衡器是利用MATLAB/SMULNK搭建信道均衡系统的仿真平台,进一步验证APA均衡器的性能。 [0010] In the above model, the equalizer APA using MATLAB / SMULNK build channel equalization simulation platform system, APA further verify the performance of the equalizer. 仿真结果表明,信号通过信道产生严重的失真,APA均衡器能够有效抑制这种码间干扰,最终达到期望波形。 Simulation results show that the distortion signals generated by the severe channel, the equalizer can be effectively suppressed APA such inter-symbol interference, and ultimately achieve the desired waveform.

[0011] 综上所述,:在相同的实验环境下,本发明专利的均衡器的误码率曲线最低,比传统的LMS及NLMS均衡器的可靠性能都要好。 [0011] In summary,: under the same experimental environment, the lowest bit error rate of the present invention patent equalizer curve can be better than traditional reliability LMS and NLMS equalizer. 此模型是在没有纠错编码、调制解调及交织技术的条件下进行的,还可以采用这些技术进一步提高系统的均衡性能。 This model is carried out in the absence of error correction coding, interleaving modulation and demodulation techniques and conditions, these techniques may also be employed to further improve the equalization performance of the system.

[0012] 下面通过附图和实施例,对本发明专利的技术方法进一步的详细描述。 [0012] Hereinafter, the accompanying drawings and detailed description of the embodiments of the present invention according to the patent the method further.

附图说明 BRIEF DESCRIPTION

[0013] 图例为本发明专利的系统模型图。 [0013] Legend of the present invention patent system model of FIG.

[0014] 附图标记说明:[0015] 1-数据发生器 [0014] REFERENCE NUMERALS: [0015] 1- data generator

[0016] 2-噪声发生器 [0016] 2- noise generator

[0017] 3-自适应均衡器 [0017] 3- adaptive equalizer

具体实施方式 detailed description

[0018] 如图所示,本发明专可分为1-数据发生器,2-噪声发生器,3-自适应均衡器。 [0018] As shown, the present invention can be divided into dedicated data generator 1-, 2- noise generator, 3- adaptive equalizer.

[0019] 图中,通过I产生信道输入序列,经延迟后作为参考信号。 [0019] FIG by generating I channel input sequence, as a reference signal after delay.

[0020] 通过数据发生器产生信道输入序列,经2产生加性高斯白噪声,经3产生输出信号。 [0020] generated by the data generator channel input sequence, over 2 to produce additive white gaussian noise, the output signal 3 is generated.

[0021] 将参考信号和输出信号,经APA算法,进行调试。 [0021] The reference signal and the output signal, the APA algorithm for debugging.

经调试,有效地消除了码间的干扰。 After debugging, effectively eliminating the interference between codes.

[0022] 综上所述,综上所述,APA均衡器是有效的,并能在信道失真较严重的场合保持一定的性能。 [0022] In conclusion, summary, APA equalizer is effective, and can be more serious distortion performance in the case to maintain a certain channel.

[0023] 以上所述,仅是本发明专利较佳实施例,并非对本发明专利作任何限制,凡是根据本发明专利技术实质以上实施所作的任何简单修改、变更以及等效结构变化,均属于本发明专利技术方法的保护范围。 [0023] The above are only preferred embodiments of the present invention patent, the patent does not set any limit to the present invention, any simple modification according to the patent all the technical spirit of the present invention made by the above embodiments, changes, and variations equivalent structures, belong to the present scope of the patent technology methods.

Claims (1)

  1. 1.基于仿射投影算法构建超宽带信道均衡器模型在接收端采用基于仿射投影算法的均衡技术,用来减小或消除因信道的时变多径传播特性引起的码间干扰。 1. Construction of affine projection algorithm based on ultra-wideband channel equalizer based on the model used at the receiver equalization technique affine projection algorithm, used to reduce or eliminate intersymbol varying multipath channel due to the propagation characteristics of interference caused.
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Cited By (2)

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CN104270539A (en) * 2014-09-12 2015-01-07 西南交通大学 Proportional affine projection echo elimination method based on coefficient difference
CN104410761A (en) * 2014-09-13 2015-03-11 西南交通大学 Convex combination adaptive echo cancellation method for affine projection sign subband adaptive filter

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CN101057469A (en) * 2004-09-17 2007-10-17 诺基亚公司 Iterative and Turbo-based method and apparatus for equalization of spread-spectrum downlink channels
WO2011152902A1 (en) * 2010-03-08 2011-12-08 Empire Technology Development Llc Broadband passive tracking for augmented reality

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CN101057469A (en) * 2004-09-17 2007-10-17 诺基亚公司 Iterative and Turbo-based method and apparatus for equalization of spread-spectrum downlink channels
WO2011152902A1 (en) * 2010-03-08 2011-12-08 Empire Technology Development Llc Broadband passive tracking for augmented reality

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104270539A (en) * 2014-09-12 2015-01-07 西南交通大学 Proportional affine projection echo elimination method based on coefficient difference
CN104410761A (en) * 2014-09-13 2015-03-11 西南交通大学 Convex combination adaptive echo cancellation method for affine projection sign subband adaptive filter
CN104410761B (en) * 2014-09-13 2016-03-02 西南交通大学 Symbol subband affine projection adaptive echo cancellation method convex combination

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