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Progressive iterative channel estimation in fast time-varying OFDM systems: 《The Journal of China Universities of Posts and Telecommunications》2014年第4期8-14,共7页YANG Rui-zhe YE Si-yang ZHANG Yan-hua SUN Yan-hua YU Richard; supported in part by the National Natural Science Foundation of China (61372089, 61201198); Considering the joint channel estimation and data detection in time-varying orthogonal frequency division multiplexing （OFDM） and addressing transmission performance degradation induced by the severe inter-carrier i...; 关键词：time-varying OFDM channel estimation ICI PROGRESSIVE KALMAN

Threshold-based piecewise companding transform for PAPR reduction in OFDM systems: 《The Journal of China Universities of Posts and Telecommunications》2013年第2期1-6,18,共7页LIU Shu-hua LI Yong-zhao ZHANG Hai-lin LIU Ying-ting; supported by the National Natural Science Foundation of China(61072069);the Fundamental Research Funds for the Central Universities(72105242);the 111 Project(B08038); Piecewise companding transform is a flexible and efficient way to solve the high peak-to-average power ratio （PAPR） problem for orthogonal frequency division multiplexing （OFDM） systems. A novel threshold-based pi...; 关键词：OFDM PAPR companding transform iterative detection

Deepen spectrum notch and reduce PAPR in OFDM systems via combining subcarriers precoding with tone reservation: 《The Journal of China Universities of Posts and Telecommunications》2011年第3期80-84,共5页ZHAO Cheng-lin LIU De-qiang SUN Xue-bin JIANG Ting; supported by the National Science & Technology Specific Major Projects (2009ZX03006-006,2009ZX03006-009);the National Natural Science Foundation of China (60432040, 60972079); In orthogonal frequency division multiplexing （OFDM） systems, spectrum notch can be generated to mitigate interference to other narrow-band services by turning off corresponding subcarriers. However, the inter-carri...; 关键词：OFDM spectrum notch PAPP subcarriers precoding tone reservation

Multicast resource allocation with min-rate requirements in OFDM systems: 《The Journal of China Universities of Posts and Telecommunications》2010年第3期24-30,51,共8页XU Wen-jun HE Zhi-qiang NIU Kai LIN Jia-ru WU Wei-ling; supported by the National Basic Research Program of China (2007CB310604, 2009CB320401);the National Natural Science Foundation of China (60772108, 60702048);the Fundamental Research Funds for the Central Universities (BUPT2009RC0111); This article addresses the multicast resource allocation problem with min-rate requirement constraints in orthogonal frequency division multiplexing （OFDM） systems. Due to the prohibitively high complexity for nonli...; 关键词：OFDM MULTICAST resource allocation min-rate requirements

Adaptive power loading with BER-constraint for OFDM systems: 《The Journal of China Universities of Posts and Telecommunications》2009年第4期91-97,共7页LIU Kai-ming ZHAO Jing CHEN Chang-xiang LIU Yuan-an; supported by the National Natural Science Foundation of China (60802033, 60873190); A novel adaptive power loading algorithm with the constraint of target overall bit error rate （BER） for orthogonal frequency division multiplexing （OFDM） systems is proposed in this article. The proposed algorithm...; 关键词：OFDM adaptive modulation power loading unequal-BER uniform bit allocation

Joint optimization of time and frequency synchronization based on polynomial sequences for OFDM systems被引量：1: 《The Journal of China Universities of Posts and Telecommunications》2009年第3期19-23,共5页ZHANG Yan-yan ZHANG Jian-hua HUANG Jiang-chun ZHANG Ping; supported by Korean Electronics and Telecommunications Research Institute,the Hi-Tech Research and Development Program of China(2006AA01Z283);the Natural Science Foundation of China(60772113); In orthogonal frequency division multiplexing （OFDM） systems, time and frequency synchronization are two critical elements for guaranteeing the orthogonality of OFDM subcarriers. Conventionally, with the employment ...; 关键词：frequency synchronization joint optimization OFDM polynomial sequences timing synchronization

Over-sampling basis expansion model aided channel estimation for OFDM systems with ICI被引量：3: 《The Journal of China Universities of Posts and Telecommunications》2008年第4期7-13,共7页LIU Si-yang LIU Yuan-an WANG Fei-fei XIE Gang ZHANG Ran-ran; the NTT DoCoMo Beijing Communications Laboratories and Sino-Swedish IMT-Advanced Cooperation Project (2008DFA11780); The rapid variation of channel can induce the intercarrier interference in orthogonal frequency-division multiplexing （OFDM） systems. Intercarrier interference will significantly increase the difficulty of OFDM chan...; 关键词：OFDM ICI over-sampling basis expansion model （OBEM）

Time-domain channel estimator based on cyclic correlationfor OFDM systems with guard interval被引量：1: 《The Journal of China Universities of Posts and Telecommunications》2008年第2期26-31,共6页IM Se-bin CHOI Hyung-jin; the National Natural Science Foundation of China (60572039)and Commsys. Laborcotory of Sungkyunkwan University in Korea; Channel impulse response （CIR） can be estimated on the basis of cyclic correlation in time-domain for orthogonal frequency division multiplexing （OFDM） systems, This article proposes a generalized channel estimati...; 关键词：CIR OFDM channel estimation mean squareerror （MSE）

Estimation of time-varying channels for pilot-assisted OFDM systems被引量：3: 《The Journal of China Universities of Posts and Telecommunications》2007年第2期94-98,共5页TANG Tian DENG Gang JIANG Jun; Orthogonal frequency division multiplexing （OFDM） systems encounter performance degradations because of the time-varying （TV） channels common in wireless environments. The channel variations within one OFDM symbol...; 关键词：OFDM pilot-assisted modulation TV channels channel estimation

Resource allocation algorithm with cross-layer design for DiffServ-based OFDM systems被引量：2: 《The Journal of China Universities of Posts and Telecommunications》2007年第2期45-50,共6页LI Xiao-hui HAN Ming YI Ke-chu TIAN Bin; According to the quality of service （QoS） requirements of differentiated service （DiffServ）, a cross-layer resource allocation algorithm for multi-user orthogonal frequency division multiplexing （OFDM） systems i...; 关键词：OFDM CROSS-LAYER QOS DIFFSERV

OFDM_SYSTEMS