A Review of Wavelets for Digital Wireless Communication

Лакшманан, М.; Nikookar, H.

doi:10.1007/s11277-006-9077-y

Cited by 178 publications

(88 citation statements)

References 90 publications

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“…During each iteration, inverse discrete wavelet packet transformation (IDWPT) up samples two signals and filters one with HPF and other with LPF. The outputs of these branches are then subsequently added [16]. The transmitted signal for WPM is given by…”

Section: Wpt-ofdmmentioning

confidence: 99%

“…Wavelet based OFDM reshapes the multicarrier transmission concept, by using wavelet carriers instead of OFDM's complex exponentials. DFTs have sines and cosines as its basis function so transients and edges in time domain cannot be localized while DWPT use irregular wave shapes of finite length which allows analyzing sharp variation and local features of signal [16].…”

Section: Introductionmentioning

confidence: 99%

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On the Simulation of BER Performances for Transform Schemes Used in OFDM

Gupta¹,

Dalal²

2013

IJCA

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Due to many special characteristics of OFDM it has been widely applied in various applications. Besides exponential transforms some other transforms like DCT and Wavelet can also be used in OFDM. Since last decade DCT is going to be a good alternative as it is a real transform hence less complex. In very recent scenario telecommunication industry has been attracted towards the wavelets. Wavelet applications are finding a way in which their performances match the current system for example in communication system. In this paper Computer simulation using MATLAB 7.0 has been used to analyze the performance of FFT, DCT and WPT OFDM in terms of bit error rate. All the simulations have been done using AWGN and Rayleigh channel. Along with it mapping schemes used in these simulations are BPSK, QPSK and Pi/4 DQPSK.

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Section: Wpt-ofdmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Simulation of BER Performances for Transform Schemes Used in OFDM

Gupta¹,

Dalal²

2013

IJCA

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“…The wavelet packet analysis and synthesis trees can be efficiently constructed by iteration of corresponding 2-channel filter bank. Therefore we can calculate the wavelet packet waveforms in a recursive manner using the following algorithm 2 1…”

Section: B Wpmcmmentioning

confidence: 99%

“…In the last 15 years OFDM has been widely adopted and standardized across the world. Recently wavelet transformation has emerged as a strong candidate for digital modulation [1]− [2]. Wavelet Packet based Multi-Carrier Modulation (WPMCM) is a novel multicarrier modulation technique and a promising alternative to the well established OFDM.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of WPMCM with Carrier Frequency Offset and Phase Noise

Karamehmedovic¹,

Лакшманан²,

Nikookar³

2009

JCM

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Abstract-Wavelet Packet based Multi-Carrier Modulation (WPMCM) offers an alternative to the well-established OFDM as an efficient multicarrier modulation technique. It has strong advantage of being a generic transmission scheme whose actual characteristics can be widely customized to fulfill several requirements and constraints of an advanced communication systems. However, a few 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 in the presence of analogue radio frequency front-end imperfections. In this paper we analyze the impact of interference in WPMCM transmission caused by the carrier frequency offset and phase noise. The sensitivity of WPMCM transceivers to these errors using standard wavelets is evaluated through simulation studies and their performances are compared and contrasted with OFDM.

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“…CP may be 20% or more of s ymbol. Thus wavelets bas ed OFDM gives about 19% -21% of more bandwidth efficiency [4]. Wavelets based OFDM is les s affected by Doppler s hift.…”

Section: Introductionmentioning

confidence: 99%

Bit Error Rate Performance Analysis for Various Modulation Techniques using SUI Channel in Multi-Carrier System

Ramakrishna

Kumar

2017

IJARCSSE

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Abstract-Orthogonal Frequency Division Multiplexing (OFDM) is of the strong prospects as a future wireless communication system. Improved spectral efficiency has been found in OFDM based on DFT, has a good orthogonality but inter symbol interference (ISI) and inter carrier interference (ICI) degrade the performance. ISI and ICI can be improved by using cyclic prefix (CP). About 20% of bandwidth is consumed by CP. For preferable performance DWT based OFDM gives better outlook than DFT based OFDM.. Three advantages of using DWT are desirable signal to noise ratio, desirable data rate and below per power requirement are given by wavelet based OFDM. Comparison of performances of BER using practical channel model known as Stanford University Interim (SUI) is given in this paper. Consideration to QPSK, 4QAM, 8QAM, 16 -QAM, 32QAM, 64-QAM, 128QAM and 256 QAM has been given in modeling. Channel condition and modulation are the pre -cursors given for the selection of particular performance.Keywords-OF DM, MIM O, BER, Cyclic Prefix, DF T, DWT, SUI Channel. I. INTRODUCTIONAs a mult icarrie r modulat ion technique orthogonal frequency divis ion multip le xing (OFDM) can be s een as a better pros pect of future wire les s communication, better quality audio, v ideo and mobile integrated s ervice are the requis ites for data trans mis s ion at higher data rates in current and future mobile co mmun ication. Inter s y mbol interference (ISI) is caus ed due to extens ion of channel impuls e res ponse over many s ymbol period and it res ults when data is s en d at high bit rates . Signal is s end in parallel form and bandwidth is divided into narrow s ub channel in Orthogonal frequency divis ion mu ltip le xing (OFDM) to do away with delay s pread [1] [2]. Signal can be executed in joint time-frequency domains wavelet trans form [3]. Orthogonality is imp roved us ing wavelet to s upport time and frequency domain. Orthogonal wavelets are capable to reduced the effect of inter s ymbol interference (ISI) and inter carrier interference (ICI) wh ich are due to loss of orthogonality between the carriers as a res ult of mu ltipath propagation over the wireles s fading channels . Cyclic prefix (CP) is us ed in OFDM to overcome inter s ymbol interference (ISI) and inter channel interference (ICI). Cyc lic pre fix (CP) is not mandatory in wave let bas ed OFDM. CP may be 20% or more of s ymbol. Thus wavelets bas ed OFDM gives about 19% -21% of more bandwidth efficiency [4]. Wavelets based OFDM is les s affected by Doppler s hift. Timefrequency as well as orthogonality is s upport in wavelet based OFDM . Phase linearity as well as imp ortant out -of band rejection is p rovided by wavelet. Factors such as mult i-p ath, frequency offset, timing offset, and noise wireless environment is unforeseeable than wired mediu m. The receiv ed signal is thus suffer from amp litude and p hase distortion as the signal p assed through adverse chann el cond itions. Channel assessment gives the idea about chann el resp onse. The dy namic assessment of channel ...

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A Review of Wavelets for Digital Wireless Communication

Cited by 178 publications

References 90 publications

On the Simulation of BER Performances for Transform Schemes Used in OFDM

On the Simulation of BER Performances for Transform Schemes Used in OFDM

Performance Evaluation of WPMCM with Carrier Frequency Offset and Phase Noise

Bit Error Rate Performance Analysis for Various Modulation Techniques using SUI Channel in Multi-Carrier System

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