An Improved Method for Analyzing &amp; Compensating of Group Delay Variations in Broadband Satellite Signals

Mohammady, L.; Eskandari, Ahmad Reza; Dadashzadeh, Gholamreza

doi:10.1109/aict.2008.33

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…[1][2][3][4] In general a filter with high selectivity has large amplitude and GD variations, which result in distortion in digital data transmission. [5][6][7] The amplitude variations or rounded edges of the passband in the filter response due to limited Q factor of the resonators is inevitable. But this gets worse when the internal losses due to limited fabrication roughness add up to the other losses of the resonators and more rounded passband edges happen.…”

Section: Introductionmentioning

confidence: 99%

“…A typical IMUX comprises a number of narrowband filters with high selectivity and fractional bandwidth of 0.2%–2% 1–4 . In general a filter with high selectivity has large amplitude and GD variations, which result in distortion in digital data transmission 5–7 . The amplitude variations or rounded edges of the passband in the filter response due to limited Q factor of the resonators is inevitable.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous flattening of amplitude and group delay responses in narrowband bandpass filters using a novel systematic design method

Eskandari

Kheirdoost

2022

Int J RF Mic Comp-Aid Eng

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In this article, a novel systematic method for compensation of the simultaneous amplitude and group delay (GD) flatness in the narrowband bandpass filters is proposed. The proposed technique can be used systematically in any type of filters with the possibility of resonator quality factor adjustment. This technique is presented using an RLC resonator equalizer in two steps. First, the compensation of the GD response is accomplished by tuning the external Q-factor, then the amplitude response is compensated by adjusting the resonator Q-factor. To verify this technique, design and fabrication of a TM dualmode equalizer for joint compensation of the amplitude and GD responses in a narrowband waveguide filter is presented. The simulation results for a novel TE dual mode equalizer is also presented. The passband response of an unequalized narrowband filter with passband flatness of 1.5 dB amplitude and 55 ns GD at the center frequency of 10.970 GHz is improved to 0.5 dB amplitude flatness and 30 ns GD flatness. This improvement is achieved at the cost of passband insertion loss. The designed equalizer is fabricated and tested and the measurement results, after and before equalization, prove the design technique capability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simultaneous flattening of amplitude and group delay responses in narrowband bandpass filters using a novel systematic design method

Eskandari

Kheirdoost

2022

Int J RF Mic Comp-Aid Eng

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“…It has many advantages, such as the adaptive interference is set to zero automatically, the super-resolution is used for the direction of resolution, and the antenna is automatic calibration and ultralow side lobe is also used. Therefore, DBF is widely used in radar [1] [2] [3], navigation [4] [5], communication [6] and so on. And DBF is used in both the transmission and the receiving channels of the array.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Analysis of Influence of Group Delay Distortion on Performance of DBF System

Gao¹,

Li²

2012

Proceedings of 2012 National Conference on Information Technology and Computer Science

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Group delay distortion between channels is one of the most important factors which affect the BER (bit error rate) performance of DBF (digital beam forming) System. The basic principles of DBF and the concept of group delay are first introduced, and a linear group delay filter is designed based on the relationship between the minimum phase system and the cepstral coefficients. And then a multi-channel group delay distortion model for simulation in MATLAB software is established. A QPSK system is simulated in multi-channel group delay. Simulation results show that the degradation of BER performance is caused by group delay distortion, and the more serious distortion of group delay, the greater deterioration of BER performance.

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An Improved Method for Analyzing & Compensating of Group Delay Variations in Broadband Satellite Signals

Cited by 2 publications

References 5 publications

Simultaneous flattening of amplitude and group delay responses in narrowband bandpass filters using a novel systematic design method

Simultaneous flattening of amplitude and group delay responses in narrowband bandpass filters using a novel systematic design method

Simulation and Analysis of Influence of Group Delay Distortion on Performance of DBF System

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