Degradation of BER by Group Delay in Digital Phase Modulation

Azizzadeh, Azad; Mohammadi, Leila

doi:10.1109/aict.2008.31

Cited by 19 publications

(8 citation statements)

References 3 publications

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“…For each group delay curve, the required added Eb/N0 to achieve the same BER is obtained. The required added Eb/N0 is called as BER Degradation (B.D) [6]. Figure 4 presents B.D versus GDm for QPSK and 8PSK modulation schemes.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Since transmission data in the phase modulation resides in phase, group delay changes the signal constellation and causes BER degradation. The group delay variation over the frequency may have a Ripple, Linear, or Parabolic shapes [6]. In our simulation, we consider a parabolic shape over the frequency bandwidth of 36 MHz which is illustrated in Figure2.…”

Section: Group Delay Characteristics Of the Satellitementioning

confidence: 99%

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BER investigation in satellite DVB-S2 service by modeling the transponder non-idealities

Doost

Kashani

Mohammadi

2014

7'th International Symposium on Telecommunications (IST'2014)

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In this paper, transponder non-idealities are modeled. For this purpose, the Saleh model of phase shift and the parabolic model of group delay are utilized. Simulation results show the phase shift and group delay affect the phase of the DVB-S2 signal and consequently change the signal constellation and cause BER degradation. Simulation results determine the maximum allowable phase shift and group delay of the transponder in order to achieve a predefined BER.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Group Delay Characteristics Of the Satellitementioning

confidence: 99%

BER investigation in satellite DVB-S2 service by modeling the transponder non-idealities

Doost

Kashani

Mohammadi

2014

7'th International Symposium on Telecommunications (IST'2014)

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show abstract

“…It is a parameter that refers to the dispersion of the individual frequency components that constitute the spectrum of the desired modulated signal. Experimental results in [22] indicate that a significant amount of constellation distortion is introduced in a QPSK modulated carrier if a parabolic group delay variation higher than 1.15 times the symbol duration T s is introduced. This can be exploited to provide security in the physical layer of a single carrier wireless communication system by means of a programmable dispersive filter.…”

Section: B Encrypting the Constellation In Single Carrier Modulated mentioning

confidence: 99%

A Novel Physical Layer Authentication With PAPR Reduction Based on Channel and Hardware Frequency Responses

Ramabadran

Afanasyev

Malone

et al. 2020

IEEE Trans. Circuits Syst. I

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Next generation wireless communications such as 5G are expected to feature wide channel bandwidths on the order of hundreds of MHz. As bandwidths increase, circuit impairments caused by frequency dependent behaviour such as ripple and tilt in gain and group delay become more significant. PAPR of OFDM signals also increase with increasing number of subcarriers. Transmitter circuit characterisation for the wide-band frequency response is needed to pre-compensate the signal to be transmitted. In this article, we propose a novel scheme which uses the circuit characteristics combined with the channel response to generate the keys for encrypting signals to provide an additional tier of security at the physical layer. The modulated constellation of the signal of interest is encrypted by dispersing its phases in addition to encrypting the bits using Diffie Hellman scheme. It is also shown that the method is able to reduce the PAPR of OFDM signals. This scheme is experimentally validated from end-to-end on a millimetre wave wireless link at 28.9 GHz demonstrating security against a well-positioned eavesdropper and a reduction of PAPR by 3.5 dB in a 2048 point OFDM signal with 1664 active QPSK modulated sub-carriers. Index Terms-Encryption, wireless communication, physical layer security, peak to average power ratio. I. INTRODUCTION M ODERN wireless communications involve transmission of digital data over vector modulated radio frequency (RF) carriers. Unlike, wired communication schemes, wireless data transmission is of broadcast nature where the occurrence of transmission is sensed and can be received by multiple

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“…Because of those analog devices and the active circuit which composed by them inevitably exist amplitude and phase difference, it makes the amplitude and the phase are not the same between transmission and receiving channels. When signals go through the respective channels, the group delay distortion may inconsistent with each signal [7] [8], which leads the waveform of each signal not to match between the rising edge and falling edge, so it has a great effect on DBF. Therefore, it has a very important significance to study the influence of the group delay distortion for DBF error performance.…”

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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Degradation of BER by Group Delay in Digital Phase Modulation

Cited by 19 publications

References 3 publications

BER investigation in satellite DVB-S2 service by modeling the transponder non-idealities

BER investigation in satellite DVB-S2 service by modeling the transponder non-idealities

A Novel Physical Layer Authentication With PAPR Reduction Based on Channel and Hardware Frequency Responses

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

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