Frame timing estimation based on statistical analysis for orthogonal frequency division multiplexing systems in multipath fading channels

2016 ◽  
Vol 10 (16) ◽  
pp. 2125-2134 ◽  
Author(s):  
Li Zhen ◽  
Hao Qin ◽  
Bin Song ◽  
Rui Ding
Keyword(s):  
Statistical Analysis ◽  
Fading Channels ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multipath Fading ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Multipath Fading Channels ◽  
Timing Estimation ◽  
Multiplexing Systems

scholarly journals PERFORMANCE EVALUATION OF FILTER BANK MULTI-CARRIER MODULATION IN MULTIPATH FADING CHANNELS

2021 ◽  
Vol 1 (1) ◽  
pp. 1-10
Author(s):  
Ali A. Abdulhussein ◽  
Hikmat N. Abdullah
Keyword(s):  
Performance Evaluation ◽  
Fading Channels ◽  
Orthogonal Frequency Division Multiplexing ◽  
Filter Bank ◽  
Multipath Fading ◽  
Symbol Error Rate ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Multipath Fading Channels ◽  
5G Technologies

Filter Bank Multi-Carrier (FBMC) modulation is one of the most significant enablers for future 5G technologies. It is a modulation technique for resolving inter-carrier and inter-symbol interference using two possible methods: Frequency Spreading (FS) and Poly Phase (PP) implementation. Cyclic prefixes are used in OFDM for signal robustness, but they have some disadvantages in orthogonal frequency division multiplexing. FBMC is used to solve the disadvantages of OFDM and save a bandwidth.  In this paper, performance comparisons in terms of symbol error rate between OFDM and FBMC systems in AWGN and multipath fading channels are presented. The obtained results show that FBMC over performs OFDM in multipath fading channels and the improvement margin is increased as the number of subcarriers decreased.

Improved Channel Estimation for OFDM Systems by Exploiting Ordered Space

2012 ◽  
Vol 271-272 ◽  
pp. 1317-1322
Author(s):  
Yu Ying Zhou
Keyword(s):  
Channel Estimation ◽  
Fading Channels ◽  
Orthogonal Frequency Division Multiplexing ◽  
Minimum Description Length ◽  
Estimation Method ◽  
Multipath Fading ◽  
Frequency Division ◽  
Ofdm Systems ◽  
Multipath Fading Channels ◽  
Ordered Space

In this paper, we propose an improved channel estimation method for orthogonal frequency division multiplexing (OFDM) systems in sparse multipath fading channels. The proposed method transforms the channel estimates into an ordered space and uses the minimum description length (MDL) criterion to estimate the number of paths and the path positions. Simulation results demonstrated that an improved channel estimation performance is obtained due to the reduction of signal space.

scholarly journals Performance Analysis of the Multiband Orthogonal Frequency Division Multiplexing Ultra-Wideband Systems for Multipath Fading and Multiuser Interference Channels

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Yuan Ouyang ◽  
Wen-Piao Lin ◽  
Chuan-Chih Liu
Keyword(s):  
Performance Analysis ◽  
Fading Channels ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multipath Fading ◽  
Ultra Wideband ◽  
Interference Channels ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Multiuser Interference ◽  
Ber Performance

This paper presents the performance analysis of the multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) systems for multipath fading and multiuser interference channels. A closed form approximation of the BER performance of the MB-OFDM UWB system with multiple interferences is proposed. Based on the derived approximation, the effects on the BER performance for the choice of the codeword constraint lengths of the convolutional encoder, the length of the cyclic prefix, and the multiuser environments of two or more interferers are thoroughly discussed. Four UWB multipath fading channels are also investigated for the BER performance of the MB-OFDM UWB system. The simulated results provide us with useful information to appropriately choose the parameters of the MB-OFDM UWB system for the sake of achieving the BER performance that conforms to requirement of the FCC standards.

scholarly journals Deep neural network for orthogonal frequency division multiplexing systems without cyclic prefix transmission

2018 ◽  
Vol 189 ◽  
pp. 04016
Author(s):  
Viet-Hung Nguyen ◽  
Minh-Tuan Nguyen ◽  
Yong-Hwa Kim
Keyword(s):  
Neural Network ◽  
Orthogonal Frequency Division Multiplexing ◽  
Deep Neural Network ◽  
Cyclic Prefix ◽  
Wireless Transmission ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm System ◽  
New Approach ◽  
Multiplexing Systems

Orthogonal frequency division multiplexing (OFDM) is widely used in wired or wireless transmission systems. In the structure of OFDM, a cycle prefix (CP) has been exploited to avoid the effects of inter-symbol interference (ISI) and inter-carrier interference (ICI). This paper proposes a new approach to transmit the signals without CP transmission. Using the deep neural network, the proposed OFDM system transmits data without the CP. Simulation results show that the proposed scheme can estimate the CP at the receiver and overcome the effect of ISI.

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