Joint PAPR reduction and sidelobe suppression in NC-OFDM based cognitive radio using wavelet packet and SC techniques

Zaki, Amira I.; Hendy, Alaa A.; Badawi, Waleed K.; Badran, Ehab F.

doi:10.1016/j.phycom.2019.04.009

Cited by 12 publications

(8 citation statements)

References 15 publications

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“…It is noticeable from the figure that, the (P sdf ) shows satisfactory performance with E = 1.5 itself. Apart from that, the probability of error in SI detection decreases while the value of E increases from 1.5 to 2.5 as shown in figure . A recently proposed technique using wavelet packet and signal cancellation 28 achieved maximum PAPR reduction at level 4 equals to 1.69 dB (fig. 5 in Reference 28) whereas the proposed method achieves 7 dB reduction in PAPR with almost same computational complexity (table 1 in Reference 28).…”

Section: Simulation Studies and Resultsmentioning

confidence: 99%

“…A recently proposed technique using wavelet packet and signal cancellation 28 achieved maximum PAPR reduction at level 4 equals to 1.69 dB (fig. 5 in Reference 28) whereas the proposed method achieves 7 dB reduction in PAPR with almost same computational complexity (table 1 in Reference 28).…”

Section: Simulation Studies and Resultsmentioning

confidence: 99%

“…An optimization algorithm for concurrent reduction of PAPR and sideband power is presented in Reference 27. Another technique based on wavelet packet and signal cancellation for the simultaneous mitigation of PAPR and side lobe power is described in Reference 28.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous minimization of side‐band power and PAPR in OFDM based cognitive radio without additional bandwidth requirement for sending SI

Sivadas

2022

Trans Emerging Tel Tech

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Cognitive radio (CR) incorporating orthogonal frequency division multiplexing (OFDM) is an intelligent spectrum sharing technique that acquires high data rate in frequency selective fading environment. OFDM has been successfully used for 4G and specific version of OFDM is being considered as the multiple access technology for 5G as well. However OFDM signal is more likely to have high peak‐to‐average power ratio (PAPR). Similarly, the sideband power of secondary or temporary users (SU) in CR can lead to interference to the licensed or primary users of the neighboring bands. In this work, an improved technique for the joint minimization of sideband power and PAPR using Zadoff‐Chu (ZC) sequence is proposed for CR based on OFDM technology. Furthermore, we propose a detection algorithm based on a binary hypothesis testing problem to recover the chosen ZC sequence at the receiver side eliminating the requirement of side information (SI) transmission. Simulation studies of the proposed method exhibits the efficiency of the concurrent reduction of PAPR and sideband power along with a huge bandwidth saving by the omission of the SI transmission.

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Section: Simulation Studies and Resultsmentioning

confidence: 99%

Section: Simulation Studies and Resultsmentioning

confidence: 99%

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Simultaneous minimization of side‐band power and PAPR in OFDM based cognitive radio without additional bandwidth requirement for sending SI

Sivadas

2022

Trans Emerging Tel Tech

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“…The problem of spectral regrowth is also caused by the Bohman filter due to rapid decline in sidelobe rate of (−24 dB/octave), and this in turn indirectly causes higher PAPR. Thus, it is important to find ways through which this problem of PAPR can be solved without causing an increase in out-of-band emissions as discussed in [8,9].…”

Section: Introductionmentioning

confidence: 99%

New 5G Kaiser-Based Windowing to Reduce Out of Band Emission

Hammoodi¹,

Audah²,

Al-Jobouri³

et al. 2022

Computers, Materials &Amp; Continua

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OFDM based waveforms are considered as the main part of the latest cellular communications standard (namely 5G). Many inherited problems from the OFDM-Based LTE are still under investigation. Getting rid of the out of band emissions is one of these problems. Ensuring low out of band emission (OOBE) is deemed as one of the most critical challenges to support development of future technologies such as 6G and beyond. Universal Filtered Multi Carrier (UFMC) has been considered as one of the candidate waveforms for the 5G communications due to its robustness against Inter Carrier Interference (ICI) and the Inter Symbol Interference (ISI). It is also a preferred option because it is the most appropriate for low latency scenarios. In this paper, a novel approach is proposed that makes use of modified Kaiser-Bessel filter-based pulse windowing instead of standard Dolph-Chebyshev filter for UFMC based waveform. The aim of proposing the new approach is to enable the reduction of spectral leakage into nearby sub-bands. A comprehensive study for the modified Kaiser-Bessel filters is performed and the results are presented in terms of several Key Performance Indicators (KPIs). Based on the results of the simulation, the UFMC Kaiser-Hankel window demonstrated lower sidebands and better power spectral density, when compared with the traditional Orthogonal frequency-division multiplexing (OFDM) and UFMC as well as the normal UFMC Kaiser window. In addition, the real test for the kaiser window with 5G waveform is lower OOBE than conventional 5G waveform (CP-OFDM and UFMC). The OOBE reduction of 31% of the Kaiser vs. the Dolph-Chebyshev filter, 68% of Kaiser Hankel over the Dolph-Chebyshev, and 20% of Kaiser Hankel over Kaiser filter have been reported in this paper. The Power Spectral Density has been improved accordingly.

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“…This method not only degrades the BER performance but also requires more power. One more method proposed is based on using SC and wavelet transform [13] to reduce OBP and PAPR jointly. However, this method requires more power, increases complexity, and also degrades BER performance.…”

Section: Introductionmentioning

confidence: 99%

An optimization technique for simultaneous reduction of PAPR and out‐of‐band power in NC‐OFDM‐based cognitive radio systems

2020

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Noncontiguous orthogonal frequency division multiplexing (NC‐OFDM)‐based cognitive radio (CR) systems achieve highly efficient spectrum utilization by transmitting unlicensed users' data on subcarriers of licensed users’ data when they are free. However, there are two disadvantages to the NC‐OFDM system: out‐of‐band power (OBP) and a high peak‐to‐average power ratio (PAPR). OBP arises due to side lobes of an NC‐OFDM signal in the frequency domain, and it interferes with the spectrum for unlicensed users. A high PAPR occurs due to the inverse fast Fourier transform (IFFT) block used in an NC‐OFDM system, and it induces nonlinear effects in power amplifiers. In this study, we propose an algorithm called “Alternative Projections onto Convex and Non‐Convex Sets” that reduces the OBP and PAPR simultaneously. The alternate projections are performed onto these sets to form an iteration, and it converges to the specified limits of in‐band‐power, peak amplitude, and OBP. Furthermore, simulations show that the bit error rate performance is not degraded while reducing OBP and PAPR.

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Joint PAPR reduction and sidelobe suppression in NC-OFDM based cognitive radio using wavelet packet and SC techniques

Cited by 12 publications

References 15 publications

Simultaneous minimization of side‐band power and PAPR in OFDM based cognitive radio without additional bandwidth requirement for sending SI

Simultaneous minimization of side‐band power and PAPR in OFDM based cognitive radio without additional bandwidth requirement for sending SI

New 5G Kaiser-Based Windowing to Reduce Out of Band Emission

An optimization technique for simultaneous reduction of PAPR and out‐of‐band power in NC‐OFDM‐based cognitive radio systems

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