Performance degradation of PN matched filter with clock frequency offset and its compensation

1987 ◽  
Vol 70 (6) ◽  
pp. 76-86
Author(s):  
Takaaki Hasegawa ◽  
Masao Nakagawas
Keyword(s):  
Matched Filter ◽  
Frequency Offset ◽  
Performance Degradation ◽  
Clock 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 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.

Ultra-Wideband TOA Estimation in the Presence of Clock Frequency Offset

2013 ◽  
Vol 12 (4) ◽  
pp. 1606-1616 ◽  
Author(s):  
Antonio A. D'Amico ◽  
Lorenzo Taponecco ◽  
Umberto Mengali
Keyword(s):  
Frequency Offset ◽  
Ultra Wideband ◽  
Clock Frequency ◽  
Toa Estimation

scholarly journals An Algorithm Combining Synchronization and Channel Estimation for OFDM Systems

2009 ◽  
Author(s):  
Pham Hong Lien ◽  
Nguyen Duy Lai
Keyword(s):  
Channel Estimation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
Multipath Fading ◽  
Frequency Offset ◽  
Frequency Division ◽  
Ofdm Systems ◽  
Clock Frequency ◽  
Close Relationship ◽  
Ofdm Signals

OFDM (Orthogonal Frequency Division Multiplexing) is more and more popular in applications of digital communications because of the effective spectrum and less impacts  of multipath fading. However, beside these advantages, OFDM signals are destroyed easily by errors such as CFO (Carrier Frequency Offset), SFO (Sampling Clock Frequency Offset). Thus, it’s necessaryto have robustly offset algorithms to overcome these disadvantages. Studies about OFDM we just examined channel estimation with assumptions that synchronization is perfect, and vice versa. However, they have a close relationship, channel estimation can be restricted if synchronization is bad, and vice versa. This paper presents an algorithm combining synchronization and channel estimation in OFDM systems. The algorithm is compared with other proposed algorithms by simulation. The simulation result of the algorithm combining synchronization and channel estimation is close to that of ideal conditions: perfect channel estimation and synchronization.

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