MMSE subcarrier equalization for filter bank based multicarrier systems

Waldhauser, D.S.; Baltar, Leonardo Gomes; Nossek, Josef A.

doi:10.1109/spawc.2008.4641663

Cited by 80 publications

(39 citation statements)

References 7 publications

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“…The derivation of the equalizer can be found in [24] for the continuous transmission case (infinite length equalizer computed in the z-domain) or in [25] for the burst transmission case (finite length equalizer computed based on a matrix model). Its application to the FBMC systems can be found in [18,20].…”

Section: Equalizer Designmentioning

confidence: 99%

“…Contrary to OFDM, OFDM-OQAM does not require the addition of a redundant guard interval and the created subchannels are only approximately flat and orthogonal. When the channel frequency selectivity increases, the OFDM-OQAM system suffers from both ISI and ICI, making it necessary to use advanced equalizer structures [17,18]. Furthermore the combination of OFDM-OQAM with MIMO techniques results in unmanageable inter-antenna interference (IAI) that prevents the straightforward application of the MIMO techniques designed for flat fading channels on each subchannel independently (as it was the case with OFDM) [19].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore the combination of OFDM-OQAM with MIMO techniques results in unmanageable inter-antenna interference (IAI) that prevents the straightforward application of the MIMO techniques designed for flat fading channels on each subchannel independently (as it was the case with OFDM) [19]. The MIMO extension of the equalizer structure [18] is proposed in [20] to deal with all sources of interference (ISI, ICI, IAI). While [20] focuses on linear and successive interference cancellation equalizers, paper [21] extends the results to the adaptive decision feedback equalizer.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dual-polarization OFDM-OQAM for communications over optical fibers with coherent detection

Horlin¹,

Fickers²,

Emplit³

et al. 2013

Opt. Express

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Abstract:In order to improve the spectral efficiency of coherent optical communication systems, it has recently been proposed to make use of the orthogonal frequency-division multiplexing offset quadrature amplitude modulation (OFDM-OQAM). Multiple optical channels spaced in the frequency domain by the symbol rate can be transmitted orthogonally, even if each channel overlaps significantly in frequency with its two adjacent channels. The solutions proposed until now in the literature unfortunately only address a single polarization communication, and therefore do not benefit from the capacity gain reached when two polarizations are used to transmit independent information signals. The aim of the present paper is to propose a receiver architecture that can decouple the two polarizations. We build an equalizer per channel at twice the symbol rate and optimize it based on the minimum mean square error (MMSE) criterion. We demonstrate the efficiency of the resulting system compared to the Nyquist wavelength-division multiplexing (N-WDM) system both in terms of performance and complexity. We also assess the system sensitivity to transmit synchronization errors and show that system can even work under significant synchronization errors.

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Section: Equalizer Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dual-polarization OFDM-OQAM for communications over optical fibers with coherent detection

Horlin¹,

Fickers²,

Emplit³

et al. 2013

Opt. Express

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show abstract

“…This is contrast to most existing contributions, where the underlying structure of FBMC communication signals is typically ignored and where the focus is placed on efficient filter designs with the aim of achieving the perfect reconstruction (PR) property [36,37] (i.e., as pursued in non-communication applications such as speech coding). It is interesting to note that the PR property is not a mandatory feature in wireless applications, since an additional equalization stage is actually needed at the receiver side to compensate for the frequency selective wireless channel [38,39].…”

Section: Introductionmentioning

confidence: 99%

Systematic design of transmitter and receiver architectures for flexible filter bank multi-carrier signals

Gutierrez

López-Salcedo

2014

EURASIP J. Adv. Signal Process.

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Multi-carrier (MC) signaling is currently in the forefront of a myriad of systems, either wired or wireless, due to its high spectral efficiency, simple equalization, and robustness in front of multipath and narrowband interference sources. Despite its widespread deployment, the design of efficient architectures for MC systems becomes a challenging task when adopting filter bank multi-carrier (FBMC) modulation due to the inclusion of band-limited shaping pulses into the signal model. The reason to employ these pulses is the numerous improvements they offer in terms of performance, such as providing higher spectral confinement and no frequency overlap between adjacent subcarriers. These attributes lead to a reduced out-of-band power emission and a higher effective throughput. The latter is indeed possible by removing the need of cyclic prefix, which is in charge of preserving orthogonality among subcarriers in conventional MC systems. Nevertheless, the potential benefits of FBMC modulations are often obscured when it comes to an implementation point of view. In order to circumvent this limitation, the present paper provides a unified framework to describe all FBMC signals in which both signal design and implementation criteria are explicitly combined. In addition to this, we introduce the concept of flexible FBMC signals that, unlike their traditional MC counterparts, do not impose restrictions on the signal parameters (i.e., symbol rate, carrier spacing, or sampling frequency). Moreover, our framework also proposes a methodology that overcomes the implementation issues that characterize FBMC systems and allows us to derive simple, efficient, and time-invariant transmitter and receiver architectures.

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“…Furthermore, the subcarrier signals follow the Nyquist pulse shaping idea, which makes the FBMC modulation more robust against narrow-band interferences and synchronization errors than OFDM. However, the channel is dispersive at the subcarrier level and thus the equalization is not a straightforward task; see, e.g., [3,4]. For further details about how OFDM and FBMC compare, we address the reader to [5].…”

Section: Introductionmentioning

confidence: 99%

Low-complexity interference variance estimation methods for coded multicarrier systems: application to SFN

Caus

Neira

Renfors

2013

EURASIP J. Adv. Signal Process.

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For single-frequency network (SFN) transmission, the echoes coming from different transmitters are superimposed at the reception, giving rise to a frequency selective channel. Although multicarrier modulations lower the dispersion, the demodulated signal is sensitive to be degraded by inter-symbol interference (ISI) and inter-carrier interference (ICI). In view of this, we use channel coding in conjunction either with filter bank multicarrier (FBMC) modulation or with orthogonal frequency division multiplexing (OFDM). To deal with the loss of orthogonality, we have devised an interference-aware receiver that carries out a soft detection under the assumption that the residual interference plus noise (IN) term is Gaussian-distributed. To keep the complexity low, we propose to estimate the variance of the IN term by resorting to data-aided algorithms. Experimental results show that regardless of the method, FBMC provides a slightly better performance in terms of coded bit error rate than OFDM, while the spectral efficiency is increased when FBMC is considered.

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MMSE subcarrier equalization for filter bank based multicarrier systems

Cited by 80 publications

References 7 publications

Dual-polarization OFDM-OQAM for communications over optical fibers with coherent detection

Dual-polarization OFDM-OQAM for communications over optical fibers with coherent detection

Systematic design of transmitter and receiver architectures for flexible filter bank multi-carrier signals

Low-complexity interference variance estimation methods for coded multicarrier systems: application to SFN

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