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2006 10th International Conference on Communication Technology（ICCT 2006）

作者： Behrad Mahboobi Said Nader-Esfahani School of Electrical and Computer Engineering University of TehranTehran Iran

In CDMA systems, turbo multi user detection for multiple access interference cancellation and channel decoding in CDMA systems has an exponentially growing complexity with number of users. In these systems, when bandwidth efficient modulations like M-ary PSK are used another exponential factor that is relates to the levels of modulation prohibitively increases the computational complexity of the receiver. In this paper we have examined a symbol based reduced complexity multi user detector, for coded and un-coded CDMA system, with a performance very near to optimal detector while having extremely low complexity. We have introduced a design formula for the required Hamming distance value for no loss in performance. Simulation results of coded and un-coded CDMA system verify the performance of our reduced complexity detector that we expect.

关键词： Turbo multi user non-binary PSK convulutional code reduced complexity Hamming distance.

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Design of a Frequency Divider with reduced complexity Based on a Resonant Tunneling Diode

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Journal of Semiconductors 2008年第7期29卷 1292-1297页

作者：杜睿戴杨杨富华中国科学院半导体研究所集成技术中心北京100083

A novel edge-triggered D-flip-flop based on a resonant tunneling diode （RTD） is proposed and used to construct a binary frequency divider. The design is discussed in detail and the performance of the circuit is verified using SPICE. Relying on the nonlinear characteristics of RTD,we reduced the number of components used in our DFF circuit to only half of that required using conventional CMOS SCFL technology.

关键词： frequency divider D-flip-flop RTD reduced complexity

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维普期刊数据库

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Exploration on 2D DOA Estimation of Linear Array Motion:Uniform Linear Motion

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China Communications 2023年第11期20卷 78-95页

作者： Jianhong Chu Zhi Zhang Yu Guo School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

Generally,due to the limitation of the dimension of the array aperture,linear arrays cannot achieve two-dimensional(2D)direction of arrival(DOA)*** the emergence of array motion provides a chance for *** this paper,a generalized motion scheme and a novel method of 2D DOA estimation are proposed by exploring the linear array *** be specific,the linear arrays are controlled to move along an arbitrary direction at a constant velocity and snap per fixed time *** the received signals are processed to synthesize the comprehensive observation vector for an extended 2D virtual ***,since most of 2D DOA estimation methods are not universal to our proposed motion scheme and the reduced-dimensional(RD)method fails to handle the case of the coupled parameters,a decoupled reduced-complexity multiple signals classification(DRC MUSIC)algorithm is designed *** results demonstrate that:a)our proposed scheme can achieve underdetermined 2D DOA estimation just by the linear arrays;b)our designed DRC MUSIC algorithm has the good properties of high accuracy and low complexity;c)our proposed motion scheme with the DRC method has better universality in the motion direction.

关键词： 2D DOA estimation linear array motion reduced complexity synthetic aperture

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