Results 131 to 140 of about 467 (179)

A novel algorithm of seeking FrFT order for speech processing

2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2011
The determination of the optimal fractional Fourier transform (FrFT) order is a crucial issue for FrFT. This paper introduces a novel algorithm is proposed for the estimation of FrFT order. We use the information of pitches, harmonies and formants in the correlogram of Gammatone filterbanks to get a few candidates of the transform order.
Duo-jia Ma, Xiang Xie, Jingming Kuang 0001   +2 more
openaire   +1 more source

A Novel Amplitude Spectrum Formation Algorithm for FRFT-TDCS

Proceedings of the 6th International Conference on Communications and Broadband Networking, 2018
For the problems of the traditional Transform Domain Communication System (TDCS) dealing with Multi-component Linear Frequency Modulation (MLFM) interference signals, we propose a novel amplitude spectrum formation algorithm for FRFT-TDCS (Transform Domain Communication System based on Fractional Fourier Transform) in this paper.
Zheng Bo, Qiu Zheng, Hengyang Zhang, Cheng Cheng   +3 more
openaire   +1 more source

New sampling theorem and multiplicative filtering in the FRFT domain

Signal, Image and Video Processing, 2019
Having in consideration a fractional convolution associated with the fractional Fourier transform (FRFT), we propose a novel reconstruction formula for bandlimited signals in the FRFT domain without using the classical Shannon theorem. This may be considered the main contribution of this work, and numerical experiments are implemented to demonstrate ...
Pham Ky Anh, L. P. Castro, P. T. Thao, Nguyen Minh Tuan   +3 more
openaire   +2 more sources

The parameters estimation of underwater transient signal based on FRFT

Proceedings of 2011 International Conference on Electronic & Mechanical Engineering and Information Technology, 2011
The ignition signal of the underwater vehicle is one of the important features. According to the shortness of the ignition signal in time domain, the signal could be similarly considered as a Linear Frequency Modulated (LFM) signal. The feature extraction comes down to the estimation of the initial frequency and the frequency modulation rate of the LFM
Di Xiao, Lanyue Zhang
openaire   +1 more source

Analysis of FRFT Based MMSE Receiver for MIMO Systems

Wireless Personal Communications, 2013
In this paper, fractional Fourier transform based minimum mean squared error (MMSE) receiver is analyzed and compared with the time and frequency domain MMSE receivers in a multi-antenna environment. The distribution of SINR at the output of the receiver is used for calculating the bit error probability and the results are verified by comparison with ...
Simranjit Singh, Rajesh Khanna, Manjeet Singh Patterh   +2 more
openaire   +1 more source

A novel algorithm of seeking FrFT order for speech enhancement

2010 7th International Symposium on Chinese Spoken Language Processing, 2010
This article introduces fractional Fourier transform (FrFT) to speech enhancement, A novel algorithm is proposed for the estimation of FrFT order. The determination of the optimal FrFT order is a crucial issue for FrFT. We use the information of pitches, harmonies and formants in correlogram of Gammatone filterbank to get a few candidates of the ...
Duo-jia Ma, Xiang Xie, Jingming Kuang 0001   +2 more
openaire   +1 more source

LFM Interference Suppression Algorithm Based on FrFT

2020 IEEE 6th International Conference on Computer and Communications (ICCC), 2020
Differential frequency hopping (DFH) communication system is widely used in the field of confidential communication with strong anti-jamming ability. Linear frequency modulation (LFM) signal with a broadband non-stationary characteristic can cause a great influence on the DFH communication system.
Zhe Li, Yusheng Yang
openaire   +1 more source

Doppler Estimation from Echo Signal Using FRFT

Wireless Personal Communications, 2013
Fractional Fourier transform has been emerged as a very promising tool in the analysis of signal processing and optical communication. In radar communication, the ambiguity function plays an important role in estimating the delay and Doppler shift introduced in received signal.
Ashutosh Kumar Singh 0005, Rajiv Saxena
openaire   +1 more source

Study of VLF Communication Technique Based on FRFT

Applied Mechanics and Materials, 2014
The atmospheric noise generated by lightning phenomena is the main source of interference in VLF communications, it is rather difficult to detect the communication signal that not only merged in strong channel noise, but probably interfered by high-tension impulse caused by thunder.
Yan Jun Wu, Gang Fu, Qian He
openaire   +1 more source

Analysis and Processing for Chirp Pulse with Matched FRFT

2012 Second International Conference on Instrumentation, Measurement, Computer, Communication and Control, 2012
In this paper, we consider analysis and processing of chirp pulses using the matched fractional Fourier transform (FRFT). Using the properties of the FRFT and the ambiguity function, the resolution performances of time delay and Doppler shift for chirp pulses based on the matched FRFT are derived systematically.
Feng Zhang, Ran Tao, Yue Wang
openaire   +1 more source