Recovery of ISI channels with Wavelet Packet Modulation using linear equalization and channel estimation

Mohammadi, Zakaria; Saadane, Rachid; Wahbi, Mohamed; Aboutajdine, Driss

doi:10.1109/isvc.2010.5654837

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…At the receiver, after the equalizer filter, the QAM symbol on subcarrier k is obtained by passing the WPM symbol through the matched filter ϕ k Àn , followed by sampling, which is the standard procedure employed to retrieve the coefficient of an orthonormal expansion in (1) [23]. In addition, W k denotes the output after sampling on subcarrier k. The equalizer filter f n and the matched filter ϕ k Àn can be combined to form an equivalent filter given by (12). The equivalent block diagram is shown in Figure 2C.…”

Section: Noise Power Gainmentioning

confidence: 99%

“…Instead of such a time-domain equalization, equalization can also be done after DWPT in the frequency domain. The time-domain equalization for WPM is explored in [10][11][12][13][14], while the frequency-domain equalization is studied in [7,14].…”

Section: Introductionmentioning

confidence: 99%

“…This method is limited to the removal of ISI, and does not include the removal of intercarrier interference (ICI). In [,], a frequency‐domain zero‐forcing (ZF) equalizer and a time‐domain MMSE equalizer are proposed for WPM. The results show that WPM with time‐domain MMSE equalization is better than WPM with frequency‐domain ZF equalization, and it is also better than OFDM employing a CP with one‐tap equalization.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Noise Power Gainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Buddhacharya

Saengudomlert

2018

ETRI Journal

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“…However, overlapping symbols make the use of CP infeasible for WPM. Existing equalization techniques for WPM can be broadly classified as timedomain equalization [12][13][14][15] and frequency-domain equalization [7,16]. Time-domain equalization is performed at the receiver before DWPT while frequencydomain equalization is performed after DWPT.…”

Section: Introductionmentioning

confidence: 99%

“…ZF and MMSE equalization with unknown CSI is investigated in [15,16]. In [15], channel estimation is accomplished using the Least Square (LS) method and equalization is performed in the time domain. The numerical results show that BER performance with LS channel estimation is comparable to perfect estimation with known channel.…”

Section: Introductionmentioning

confidence: 99%

BER Performance Investigation of WPM with Unknown CSI Using Time-Domain MMSE Equalization

2019

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Wavelet Packet Modulation (WPM) is an emerging Multi-Carrier Modulation (MCM) technique regarded as a potential alternative to widely used Orthogonal Frequency Division multiplexing (OFDM). OFDM uses Cyclic Prex (CP) and can rely on one-tap equalization. Since WPM has overlapping symbols in the time domain, equalization cannot depend on the use of CP. This paper considers time-domain Minimum Mean-Square Error (MMSE) equalization for WPM with unknown Channel State Information (CSI), where equalizer filter coefficients are computed using known training sequences. The infuence of the transmission overhead due to training sequences on the Bit Error Rate (BER) performance is investigated considering quasistatic time-varying Rayleigh fading channels. Numerical results from computer simulations show that, with moderate overhead due to training sequences, BER performances are comparable with the case of known CSI. Furthermore, WPM is compared to OFDM with one-tap equalization, and is shown to provide better BER performances as compared to OFDM. Finally, this paper demonstrates improvement in Peak-to-Average Power Ratio (PAPR) of the transmitted signal using subcarrier combining for WPM in heterogeneous communication environments, where low-rate and high-rate devices share the same transmission resources.

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Channel Estimation and Bit Loading for WPM with Time-Domain MMSE Equalization

Buddhacharya

Saengudomlert

2019

2019 16th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolo

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Recovery of ISI channels with Wavelet Packet Modulation using linear equalization and channel estimation

Cited by 4 publications

References 6 publications

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

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

BER Performance Investigation of WPM with Unknown CSI Using Time-Domain MMSE Equalization

Channel Estimation and Bit Loading for WPM with Time-Domain MMSE Equalization

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