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An Adaptive Howling canceller Using 2-Tap Linear Predictor

Circuits and Systems 2013年第1期4卷 6-10页

作者： Akira Sogami Yosuke Sugiura Arata Kawamura Youji Iiguni Department of Systems Innovation Graduate School of Engineering Science Osaka University Toyonaka Japan

This paper proposes an adaptive howling canceller using notch filter and 2-tap linear predictor, where howling consists of a single sinusoidal signal whose magnitude is much greater than other frequency’s magnitudes. The employed 2-tap linear predictor can quickly detect howling due to its high convergence speed. Although the output signal of the 2-tap linear predictor cannot be directly used as one of a howling canceller, we can obtain the frequency of howling from the filter coefficient. We utilize the filter coefficient of the 2-tap linear predictor to design a notch filter which achieves a very narrow elimination band. The designed notch filter removes only howling and retains other desired signals. Simulation results show that the proposed adaptive howling canceller can quickly detect and effectively remove howling.

关键词： Howling canceller Linear Predictor Notch Filter Single Sinusoidal Signal Convergence Speed

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Blind adaptive constrained constant modulus algorithms based on unscented Kalman filter for beamforming

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Journal of Central South University 2017年第10期24卷 2342-2352页

作者： QIAN Hua-ming LIU Ke JIAO Zhi-bo MA Jun-da College of Automation Harbin Engineering UniversityHarbin 150001China Hainengda Communication Co. Ltd.Shenzhen 518000China

This work proposes constrained constant modulus unscented Kalman filter(CCM-UKF) algorithm and its low-complexity version called reduced-rank constrained constant modulus unscented Kalman filter(RR-CCM-UKF) algorithm for blind adaptive beamforming. In the generalized sidelobe canceller(GSC) structure, the proposed algorithms are devised according to the CCM criterion. Firstly, the cost function of the constrained optimization problem is transformed to suit the Kalman filter-style state space model. Then, the optimum weight vector of the beamformer can be estimated by using the recursive formulas of UKF. In addition, the a priori parameters of UKF(system and measurement noises) are processed adaptively in the implementation. Simulation results demonstrate that the proposed algorithms outperform the existing methods in terms of convergence speeds, output signal-tointerference-plus-noise ratios(SINRs), mean-square deviations(MSDs) and robustness against steering mismatch.

关键词： constrained constant modulus criterion blind beamforming unscented Kalman filter generalized sidelobe canceller

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BLIND ADAPTIVE XPIC BASED ON HOS

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Journal of Electronics(China) 2001年第2期18卷 113-120页

作者： Fu Haiyang Yang Longxiang (Dept. of Comm. Eng., Nanjing University of Posts and Telecomm., Nanjing 210003)Peng Jianglong (Qingdao TeJecommunication Bureau, Qingdao 266000) Dept. of Comm. Eng. Nanjing University of Posts and Telecomm. Nanjing Qingdao Telecommunication Bureau Qingdao

This paper presents a new blind XPIC and a new adaptive blind deconvolutional algorithm based on HOS processing, which separates and equalizes the signals in real time. The simulation results demonstrate that the performance of the proposed adaptive blind algorithm,compared with the conventional algorithms, is outstanding with the feature of feasibility, stability and fast convergence rate.

关键词： High order statistics(HOS) Blind deconvolutional algorithms Cross-polarization interference canceller (XPIC)

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Determination of Array Gain of Single Hop to Achieve the Performance of a 2-Hop Wireless Link

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Journal of Computer and Communications 2018年第7期6卷 84-98页

作者： Abu Sayed Md. Mostafizur Rahaman Jesmin Akhter Md. Rafsan Jani Md. Imdadul Islam Department of Computer Science and Engineering Jahangirnagar University Savar Dhaka Bangladesh Institute of Information Technology Jahangirnagar University Savar Dhaka Bangladesh

In adaptive beamforming system adaptive algorithm of digital filter is applied to update the weighting vector of the antenna elements to get antenna gain along the desired direction and attenuation along the jammer. The objective of the paper is to evaluate the threshold gain of the adaptive beam former along the line of sight (LOS) between the transmitter and the receiver (including jammer suppression) to make the single hop link comparable with 2-hop link. The single hop and 2-hop communication systems are compared in context of symbol error rate (SER) under fading condition theoretically and verified by simulation. Finally we evaluate the numerical value of threshold gain of adaptive beamformer of two antenna elements under Rayleigh and Nakagami-m fading conditions.

关键词： Array Antenna System BER Threshold Array Gain Side Lobe canceller Path Loss

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基于OMAP-L138和PJSIP协议栈的SIP-UA设计与实现

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信息技术 2012年第9期36卷 83-87页

作者：王勇江崔慧娟唐昆清华大学电子工程系清华信息科学与技术国家实验室北京100084

在开源PJSIP协议栈的基础上,应用TI公司推出的低功耗高性能的OMAP-L138处理器,提出了PJProject源码移植的方法,并将影响系统性能的iLBC Codec移植到DSP端实现,利用DSPLINK开发包完成ARM和DSP的双核通信,从而实现了SIP-UA的基本功能。实... 详细信息

在开源PJSIP协议栈的基础上,应用TI公司推出的低功耗高性能的OMAP-L138处理器,提出了PJProject源码移植的方法,并将影响系统性能的iLBC Codec移植到DSP端实现,利用DSPLINK开发包完成ARM和DSP的双核通信,从而实现了SIP-UA的基本功能。实验结果表明,PJMEDIA中的echo canceller和不同的采样率是影响系统的两大因素,同时还比较了定点和浮点运算对系统性能的影响。

关键词： OMAP-L138 PJSIP 移植 DSPLINK echo canceller

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