Performance Evaluation of Wavelet OFDM Using ASCET

Data transmission over power line networks is a challenging telecommunication problem whose interest has grown up in recent years. Within different technologies, Wavelet OFDM has been recommended as medium access technique for broadband power line communications (PLCs). In IEEE 1901, the wavelet OFDM physical layer (PHY) defines a transmitter based on cosine-modulated filter bank (CMFB), for which due to the power line channel features, a receiver with an efficient equalizer is needed. In this work, we obtain the value of the coefficients of an equalizer integrated in an Adaptive Sine-Modulated/Cosine-Modulated Filter Bank Equalizer for Transmultiplexers (ASCET), which could be used to compensate for the power line channel effects. Our proposal focuses on the two-order system, analyzing the frequency points to be sampled and deriving the theoretical expression to obtain its coefficients. With the aim of evaluating the performance of this equalizer, a comparison between 2-ASCET and lower-order ASCET, (0-ASCET and 1-ASCET) is carried out considering in-home and in-vehicle scenarios. This study is completed with several computer simulations.

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“…Following a similar reasoning to that described in [10], [12], [13], the 2-ASCET can be expressed as a 5-tap FIR filter 1…”

Section: B 2-ascetmentioning

confidence: 99%

“…The global output is the combination of both CMFB and SMFB equalized outputs. In [9], [10], the calculation methods to obtain the 0-ASCET and 1-ASCET coefficients from a known channel transfer function, are described. In this work, our research is centered on 2-ASCET systems and we extend its applications to an in-vehicle PLC.…”

Section: Introductionmentioning

confidence: 99%

2-ASCET for Broadband Multicarrier Transmission over In-home and In-vehicle Power Line Networks

Benel

Cruz–Roldán

2015

2015 IEEE 18th International Conference on Intelligent Transportation Systems

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“…Thus, an efficient equalization technique in DWMT with lower complexity is yet to be standardized. Different equalization techniques have been proposed for DWMT based systems, which can be studied in various research works [25][26][27].…”

Section: Equalization Techniquesmentioning

confidence: 99%

DWMT transceiver equalization using overlap FDE for downlink ADSL

Khan¹,

Baig²,

Nawaz³

2015

Turk J Elec Eng & Comp Sci

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Discrete wavelet multitone (DWMT) modulation is a wavelet transform based technique implemented using perfect reconstruction filter banks. It has been recently proposed for various wireline channels such as digital subscriber loops (DSLs) as a solution to the problems posed by a discrete multitone (DMT) transceiver including interblock interference (IBI) and lower spectral efficiency due to the employment of a cyclic prefix (CP) in the guard interval (GI) for DMT symbols. The greater side lobe attenuation offered by wavelet filter banks results in improved spectral containment and lower IBI in DWMT transceivers. However, no standard equalization technique exists for a DWMT based transceiver so as to remove the effect of channel on the transmitted signal in DWMT systems. This paper proposes the application of overlap frequency domain equalization (OFDE) in DWMT modulated systems and compares the bit error rate (BER) performance with time domain equalization (TDE) technique. It is shown through simulation results that minimum mean square error (MMSE) based OFDE can be applied as an equalization technique for a downlink asymmetric DSL (ADSL) channel with lower computational complexity and BER performance comparable to that of TDE.

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“…This noise power level, which is also a signal-to-noise ratio, is controlled by the out-of-band attenuation of the prototype filter. Note that a perfect reconstruction (PR) approach has no residual interference, in theory, when receiver and transmitter are connected back-toback [5]. However, in the presence of the channel, the perfect reconstruction property is lost, unless a global channel equalization technique is implemented, which is complex and takes a long time to initialize at the beginning of a packet.…”

Section: Fbmc With Oqam and Npr Filtersmentioning

confidence: 99%

OFDM and FBMC transmission techniques: a compatible high performance proposal for broadband power line communications

et al. 2010

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A filter bank multicarrier (FBMC) system having a high level of compatibility with the IEEE P1901 OFDM scheme is proposed. In order to reach the level of robustness, selectivity and performance required by the broadband power line, the approach is based on near perfect reconstruction (NPR) filters combined with OQAM modulation. A key feature of the approach is the fractionally-spaced sub-channel equalizer, which is able to compensate the channel distortions and cope with residual timing offsets. The system initialization procedure and the results of OFDM are exploited by FBMC and an efficient and accurate technique is described for the derivation of the subchannel equalizer coefficients from the OFDM frequency domain equalizer coefficients. Then, the impact of the filter impulse response on the efficiency in packet transmission is minimized. Finally, the impact of the sub-channel spacing is investigated and, in a comparison on similar basis, it appears that the proposed FBMC system can reach 228 Mbit/s in maximum bit rate, versus 197 Mbit/s for OFDM, while providing a higher level of tone protection and robustness to jammers.

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Performance Evaluation of Wavelet OFDM Using ASCET

Cited by 19 publications

References 10 publications

2-ASCET for Broadband Multicarrier Transmission over In-home and In-vehicle Power Line Networks

2-ASCET for Broadband Multicarrier Transmission over In-home and In-vehicle Power Line Networks

DWMT transceiver equalization using overlap FDE for downlink ADSL

OFDM and FBMC transmission techniques: a compatible high performance proposal for broadband power line communications

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