Elimination of cyclic prefix of OFDM systems using filter bank based multicarrier systems

Arya, K.; Vijaykumar, C.

doi:10.1109/tencon.2008.4766394

Cited by 6 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2). Then, adopting the same assumptions as before, one can write an equation analogous to (5) for each receive antenna j = 1, 2, . .…”

Section: System Modelmentioning

confidence: 99%

“…7(b)). This behavior is again explained by the fact that, in the highly frequency selective case, the assumption of a locally flat CFR, and hence (5), is much less valid. Fig.…”

Section: Siso Systemsmentioning

confidence: 99%

“…Furthermore, although the OQAM-based OFDM scheme can be seen to exhibit similar peak-to-average power ratio (PAPR) performance with classical OFDM/QAM [55], the presence of spectral leakage in the latter may ultimately generate higher peak power values [85]. Moreover, because of the good time localization, a CP does not have to be included in the OFDM/OQAM transmission, 1 which leads to still higher transmission rates [80,5,74].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preamble-based channel estimation in OFDM/OQAM systems: A review

et al. 2013

View full text Add to dashboard Cite

Filter bank-based multicarrier (FBMC) systems based on offset quadrature amplitude modulation (FBMC/OQAM) have recently attracted increased interest (in applications including DVB-T, cognitive radio, and powerline communications) due to their enhanced flexibility, higher spectral efficiency, and better spectral containment compared to conventional OFDM. FBMC/OQAM suffers, however, from an imaginary inter-carrier/inter-symbol interference that complicates signal processing tasks such as channel estimation. Most of the methods reported thus far in the literature rely on the assumption of (almost) flat subchannels to more easily tackle this problem, with the aim of addressing it in a way similar to OFDM. However, this assumption may be often quite inaccurate, due to the high frequency selectivity of the channel and/or the small number of subcarriers employed to cope with frequency dispersion in fast fading environments. In such cases, severe error floors are exhibited at medium to high signal-to-noise ratio (SNR) values, that cancel the advantage of this modulation over OFDM. Moreover, the existing methods provide estimates of the subchannel responses, most commonly in the frequency domain. The goal of this paper is to revisit this problem through an alternative formulation that focuses on the estimation of the channel impulse response itself and makes no assumption on the degree of frequency selectivity of the subchannels. The possible gains in estimation performance offered by such an approach are investigated through the design of optimal (in the mean squared error sense) preambles, of both the full and sparse types, and of the smallest possible duration of only one pilot FBMC symbol. Existing preamble designs for flat subchannels are then shown to result as special cases. The case of longer preambles, consisting of two consecutive pilot FBMC symbols, is also analyzed. Simulation results are presented, for both mildly and highly frequency selective channels, that demonstrate the significant improvements in performance offered by the proposed approach over both OFDM and the optimal flat subchannel-based FBMC/OQAM method. Most notably, no error floors appear anymore over a quite wide range of SNR values.

show abstract

“…2). Then, adopting the same assumptions as before, one can write an equation analogous to (5) for each receive antenna j = 1, 2, . .…”

Section: System Modelmentioning

confidence: 99%

“…7(b)). This behavior is again explained by the fact that, in the highly frequency selective case, the assumption of a locally flat CFR, and hence (5), is much less valid. Fig.…”

Section: Siso Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preamble-based channel estimation in OFDM/OQAM systems: A review

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The prototype filter ( ) h t is designed to not only contribute great stopband attenuation, but also compensate the optical channel dispersion [16]. Note that, the direct implementation of OFDM/OQAM system depicted in Fig.…”

Section: Principle Of Ofdm/oqammentioning

confidence: 99%

Experimental demonstration of 110-Gb/s unsynchronized band-multiplexed superchannel coherent optical OFDM/OQAM system

Li¹,

Jiang²,

Li³

et al. 2013

Opt. Express

View full text Add to dashboard Cite

In this paper, we experimentally demonstrate the first 110-Gb/s multi-band superchannel coherent optical orthogonal frequency-division multiplexing based on offset quadrature amplitude modulation (OFDM/OQAM) system. Unlike the conventional orthogonal band-multiplexed OFDM system, no timing or frequency synchronization is required for the OFDM/OQAM system. We further investigate the influence of guard band, and find that very trivial guard band spacing (< 20 MHz) is required without any sensitivity performance or spectral efficiency degradation. Thus, the newly designed scheme would significantly reduce the implementation constrains for the band-multiplexed superchannel coherent optical OFDM system.

show abstract