Results 51 to 60 of about 2,369 (180)

Multipath effect analysis and pre-distortion processing for jamming on wideband ground radar through antenna sidelobe

The Journal of Engineering, 2019
The multipath transmission has a serious effect on jamming efficiency in a short distance ECM task for wideband ground radars. After the sidelobe gain model for a large antenna is introduced, the characteristics of multipath channel in time and frequency
Rong Shi, Jiantao Xu
doaj   +1 more source

CGLS Method for Efficient Equalization of OFDM Systems Under Doubly Dispersive Fading Channels with an Application into 6G Communications in Smart Overcrowded

International Journal of Crowd Science
Because of its superior multipath channel performance and spectrum efficiency, orthogonal frequency-division multiplexing (OFDM) is one of the most suitable candidates for the 6G physical layer in contemporary applications like smart cities and crowded ...
Issa Haitham M. Ata
doaj   +1 more source

Advancements in Multipath Mitigation for GNSS Receivers: Review of Channel Estimation Techniques

Space: Science & Technology
Multipath interference poses substantial challenges to global navigation satellite system (GNSS) receivers, leading to inaccuracies in the time of arrival (TOA) measurement of the line of sight (LOS) signal. Therefore, to mitigate the impact of multipath
Pedro Miguel Coelho Pereira, Hélder David Malheiro da Silva, Carlos Manuel Gregório Santos Lima   +2 more
doaj   +1 more source

Three Dimensional Concatenated Codes in OFDM Transmission System under a Rayleigh Fading Channel with Carrier Interference

Journal of Engineering and Sustainable Development, 2008
Orthogonal frequency division multiplexing (OFDM) or multicarrier transmission has been shown to be an effective technique to combat multipath fading in wireless Communications.
Ghanim Abd AlKareem
doaj  

PCCC MC-CDMA COMBINATION PERFORMANCE OVER MULTIPATH RAYLEIGH FADING CHANNEL

Journal of Engineering, 2010
his work presents the simulation of a Parallel Concatenation Convolution Coding PCCC with Multi-Carrier Code Division Multiple Access (MC-CDMA) system over multipath fading channels with a comparison with the uncoded data and that uses Serial ...
Husam Abduldaem Mohammed
doaj   +1 more source

Channel Estimation for Massive MIMO TDD Systems Assuming Pilot Contamination and Frequency Selective Fading

IEEE Access, 2017
Channel estimation is crucial for massive multiple-input multiple-output (MIMO) systems to scale up multi-user MIMO, providing significant improvement in spectral and energy efficiency.
Felipe A. P. De Figueiredo, Fabbryccio A. C. M. Cardoso, Ingrid Moerman, Gustavo Fraidenraich   +3 more
doaj   +1 more source

EM-based blind LDPC identification in multipath channels

Tongxin xuebao, 2018
As the advent of cognitive radios,blind encoder identification has attracted increasingly attentions since it plays an important role.The existing works mainly focus on additive white Gaussian noise (AWGN) channel,while the blind identification in ...
Yu LIU, Fanggang WANG, Jingwen ZHANG, Bo AI, Zhangdui ZHONG   +4 more
doaj   +2 more sources

EM-Based Channel Estimation Algorithms for OFDM

EURASIP Journal on Advances in Signal Processing, 2004
Estimating a channel that is subject to frequency-selective Rayleigh fading is a challenging problem in an orthogonal frequency division multiplexing (OFDM) system.
Ma Xiaoqiang, Kobayashi Hisashi, Schwartz Stuart C   +2 more
doaj   +1 more source

Partial PIC-MRC Receiver Design for Single Carrier Block Transmission System over Multipath Fading Channels

International Journal of Antennas and Propagation, 2012
Single carrier block transmission (SCBT) system has become one of the most popular modulation systems due to its low peak-to-average power ratio (PAPR), and it is gradually considered to be used for uplink wireless communication systems. In this paper, a
Juinn-Horng Deng, Sheng-Yang Huang
doaj   +1 more source