Large frequency offset carrier synchronization in segmented matched filter DS/BPSK receiver

2006 ◽  
Author(s):  
Zhao Weigang ◽  
Yao Tingyan ◽  
Wu Jinpei ◽  
Zhang Qishan
Keyword(s):  
Matched Filter ◽  
Frequency Offset ◽  
Carrier Synchronization ◽  
Large Frequency

scholarly journals Reliability of Trigonometric Transform-based Multi-Carrier Scheme

2018 ◽  
Vol 6 (2) ◽  
pp. 49 ◽  
Author(s):  
Samah A. Mustafa
Keyword(s):  
Carrier Frequency ◽  
Carrier Frequency Offset ◽  
Matched Filter ◽  
Average Power ◽  
Low Complexity ◽  
Frequency Offset ◽  
Fast Transform ◽  
Communication Signal ◽  
Front End ◽  
Trigonometric Transform

This work is looking for a new physical layer of a multi-carrier wireless communication system to be implemented in low complexity way, resorting to suitable fast transform. The work presents and assesses a scheme based on Discrete Trigonometric Transform with appending symmetric redundancy either in each or multiple consecutive transformed blocks. A receiver front-end filter is proposed to enforce whole symmetry in the channel impulse response, and bank of one tap filter per sub-carrier is applied as an equalizer in the transform domain. The behaviour of the transceiver is studied in the context of practical impairments like fading channel, carrier frequency offset and narrow band interference. Moreover, the performance is evaluated in contrast with the state of art methods by means of computer simulations, and it has been found that the new scheme improves robustness and reliability of communication signal, and record lower peak to average power ratio. The study demonstrates that front-end matched filter effectively performs frequency synchronization to compensate the carrier frequency offset in the received signal.

scholarly journals Analysis of communications and implementation performance of FFT based carrier synchronization of BPSK/QPSK bursts

2008 ◽  
Vol 6 ◽  
pp. 95-100 ◽  
Author(s):  
U. Wasenmüller ◽  
T. Brack ◽  
N. Wehn
Keyword(s):  
Fourier Transform ◽  
Maximum Likelihood ◽  
Maximum Likelihood Estimation ◽  
Likelihood Estimation ◽  
Frequency Offset ◽  
Frequency Offset Estimation ◽  
Hardware Complexity ◽  
Carrier Synchronization ◽  
Phase Offset ◽  
Combine Phase

Abstract. Carrier synchronization is a vital part of every inner receiver in wireless communications. Frequency offset and phase offset of the received burst must be estimated and the received samples must be corrected according to the estimation. An approximation of the maximum likelihood estimation of frequency offset is given by the Fast Fourier Transform (FFT). The accuracy of the estimation as well as the hardware complexity and throughput depend on the number of FFT points. We demonstrate three techniques to improve the accuracy of the FFT based frequency offset estimation respectively to reduce the number of needed FFT points. These three techniques as well as the reference algorithm without improvements combine phase offset estimation with frequency offset estimation. We present the communications and FPGA implementation performance of these techniques.

scholarly journals Parameter estimation and signal detection algorithm based on adaptive capture in non-cooperative communication

2021 ◽  
Vol 336 ◽  
pp. 04002
Author(s):  
Zilong He ◽  
Peng Sun ◽  
Kexian Gong ◽  
Hua Jiang
Keyword(s):  
Parameter Estimation ◽  
Signal Detection ◽  
Cooperative Communication ◽  
Matched Filter ◽  
Signal To Noise Ratio ◽  
Frequency Offset ◽  
Detection Algorithm ◽  
Estimation Accuracy ◽  
Signal Frequency ◽  
Signal Spectrum

Aiming at the problem that the frequency offset in the non-cooperative communication system causes the received signal spectrum to shift, which exceeds the passband of the matched filter and affects the subsequent demodulation, a parameter estimation and signal detection algorithm based on adaptive capture is proposed by this paper, which is more convenient for hardware implementation and consumes less resources. The algorithm is divided into three parts. Firstly, use the correlation value between the signal and the preamble sequence as the basis for frequency capture. Secondly, the frequency is accurately estimated based on the interpolation algorithm. Finally, the phase-locked loop structure is used to track the frequency according to the characteristics of the frequency gradually changing and the signal frequency offset is eliminated in the Digital Down Converter stage. It provides necessary conditions for accurate signal detection and phase estimation. The simulation results show that the algorithm has high estimation accuracy, wide esti-mation range and low complexity. It can also achieve better estimation accuracy and detection performance under low signal-to-noise ratio.

An Improved Large Frequency Offset Estimator Using Interpolation of Expanded Periodogram

2012 ◽  
Vol E95.B (9) ◽  
pp. 3007-3010
Author(s):  
Seunghyun NAM ◽  
Jong-Min PARK ◽  
Heewook KIM ◽  
Tae Chul HONG ◽  
Kunseok KANG ◽  
...  
Keyword(s):  
Frequency Offset ◽  
Large Frequency
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