Peak-to-Average Power Ratio reduction of Wavelet Packet Modulation by adaptive phase selection

Wavelet Packet based Multi-Carrier Modulation (WPMCM) offers an alternative to the well-established OFDM as an efficient multicarrier modulation technique. It has the advantage of being a generic transmission scheme whose actual characteristics can be widely customized to fulfill several requirements and constraints of advanced communication systems. In the last decades wavelets have been favorably applied in signal and image processing fields but only recently have they attracted the attention of the telecommunication community. A lot of research questions remain to be addressed before the novel WPMCM can be used in practice. One of the major concerns is the performance of WPMCM transceivers under time synchronization errors. This is important because WPMCM symbols overlap in the time domain. In this paper, we analyze the interference in WPMCM transmission caused by the time synchronization errors. The expressions for Inter Carrier Interference (ICI) and Inter Symbol Interference (ISI) in WPMCM transmission are derived and then through simulation studies, the ability of wavelet-based systems to cope with time synchronization errors is evaluated.

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“…Furthermore, the Peakto-Average Power Ratio (PAPR) performance of WPMCM and OFDM are comparable [38].…”

Section: Resultsmentioning

confidence: 99%

An Investigation on the Sensitivity of Wavelet Packet Modulation to Time Synchronization Error

Лакшманан

Karamehmedovic

Nikookar

2010

Wireless Pers Commun

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“…The PAPR for WPM has been investigated in [,,]. In , statistics of WPM signals and their power distributions are analyzed along with the impact on the PAPR owing to different wavelet families and wavelet filter lengths.…”

Section: Introductionmentioning

confidence: 99%

“…The PAPR for WPM has been investigated in [6,8,9]. In [6], statistics of WPM signals and their power distributions are analyzed along with the impact on the PAPR owing to ----------------------------------------------------------------------------------------------------------------------------------------------------------------------different wavelet families and wavelet filter lengths.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of WPM ‐based transmission with equalization‐aware bit loading

Buddhacharya

Saengudomlert

2018

ETRI Journal

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Wavelet packet modulation (WPM) is a multicarrier modulation (MCM) technique that has emerged as a potential alternative to the widely used orthogonal frequency‐division multiplexing (OFDM) method. Because WPM has overlapped symbols, equalization cannot rely on the use of the cyclic prefix (CP), which is used in OFDM. This study applies linear minimum mean‐square error (MMSE) equalization in the time domain instead of in the frequency domain to achieve low computational complexity. With a modest equalizer filter length, the imperfection of MMSE equalization results in subcarrier attenuation and noise amplification, which are considered in the development of a bit‐loading algorithm. Analytical expressions for the bit error rate (BER) performance are derived and validated using simulation results. A performance evaluation is carried out in different test scenarios as per Recommendation ITU‐R M.1225. Numerical results show that WPM with equalization‐aware bit loading outperforms OFDM with bit loading. Because previous comparisons between WPM and OFDM did not include bit loading, the results obtained provide additional evidence of the benefits of WPM over OFDM.

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“…Literature [4][5][6][7] attempted to solve the problem from the optimization of wavelet packet modulation. Some studies [8] and [9] present the method of probability to reduce PAPR, not only to affect the BER performance of system but to have high complexity, such as PTS technology. Methods of pre distortion [10] and [11], which implement nonlinear transform to the demodulated signals to decrease PAPR such as the method of µ-law companding transform are also studied.…”

Section: Introductionmentioning

confidence: 99%

PAPR Reduction Schemes for Lifting Scheme based Orthogonal Wavelet Packet Multiplexing System

Tan¹,

Guangwu²,

Wei³

2015

TOCSJ

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Lifting scheme based orthogonal wavelet packet multiplexing (LOWPM) system can increase computation efficiency and save storage space, but as a new multicarrier modulation system, it also has the problem of high peak to average power ratio (PAPR). In order to reduce computational complexity and improve the effect of PAPR suppression for Partial Transmit Sequence (PTS) technology, PAPR reduction schemes based on the technology of pruning wavelet packet modulation and the improved threshold search for PTS are put forward in the paper, through proper pruning of the fulltree structure of wavelet packet modulation in the PTS to reduce the number of nodes in the system, and finally improve the effect of PAPR reduction, and on the other hand, through improving threshold search to increase the processing efficiency. Simulation results show that the proposed algorithm compared with the original algorithm has corresponding performance improvement, and on the condition of not affecting the original bit error rate of system, can better reduce PAPR, while decreasing the computational complexity.

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Peak-to-Average Power Ratio reduction of Wavelet Packet Modulation by adaptive phase selection

Cited by 9 publications

References 9 publications

An Investigation on the Sensitivity of Wavelet Packet Modulation to Time Synchronization Error

An Investigation on the Sensitivity of Wavelet Packet Modulation to Time Synchronization Error

Performance analysis of WPM ‐based transmission with equalization‐aware bit loading

PAPR Reduction Schemes for Lifting Scheme based Orthogonal Wavelet Packet Multiplexing System

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