A Study of Adaptive Equalizer for APSK in the Satellite Broadcasting System

Suzuki, Yôiti; Hashimoto, Akinori; Kojima, Masaaki; Sujikai, Hisashi; Tanaka, Shōji; Kimura, Tomoki; Kazuyoshi, Shogen

doi:10.1109/glocom.2009.5425873

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…Initial study has suggested the potential use of the DFE to minimize the effects on nonlinear distortion, specially when combining Pilot-Based and DD training. Instead of CMA, as used in this work, the results presented in [7] [8] and the adaptation is obtained by means of the Least Mean Squares (LMS) algorithm [9].…”

Section: Introductionmentioning

confidence: 99%

An adaptive equalizer for reliable transmissions in DVB-S2 satellite communications under ISI

Sapper¹,

Lima²,

Chaves³

et al. 2014

2014 IEEE Latin-America Conference on Communications (LATINCOM)

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This paper presents a proposal of an Adaptive Equalizer based on DFE, and its implementation in FPGA, to make DVB-S2 transmission reliable under ISI (specially for wideband transmissions) and to make possible the mobile reception over satellite links for QPSK modulation. The Equalizer also presents the potential to reduce the nonlinear distortion effects, which are typically found in the satellite link and is caused by the satellite power amplifiers. This mainly affects high order modulations. The implementation is very flexible because it can make use of CMA and DD algorithms as well as the DVB-S2 header and embedded pilots as training sequences. Its adaptation is performed using the LMS algorithm. The paper presents the proposed architecture and algorithms, the VHDL simulations for AWGN channels and ISI, and the FPGA implementation resource usage. This is the initial step towards an implementation in VLSI.

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Section: Introductionmentioning

confidence: 99%

An adaptive equalizer for reliable transmissions in DVB-S2 satellite communications under ISI

Sapper¹,

Lima²,

Chaves³

et al. 2014

2014 IEEE Latin-America Conference on Communications (LATINCOM)

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“…In satellite systems, the effects caused by the nonlinearity of the TWTA and filter characteristics of an input de-multiplexer (IMUX) and an output multiplexer (OMUX) -which cause linear distortion [1] -are very critical to the system performance and shall be tackled [1], [2], [3]. A traditional way to deal with those effects is by means of pre-distortion techniques.…”

Section: Introductionmentioning

confidence: 99%

An Adaptive Equalizer to Reduce the Nonlinear Distortion Effects in Satellite Broadcasting Systems

Lima¹,

Sapper²,

Fernandes³

2015

Anais De XXXIII Simpósio Brasileiro De Telecomunicações

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This article presents the BER performance improvements achieved when adopting Adaptive Equalization based on Decision Feedback Equalizer (DFE) to tackle the negative effects of nonlinear distortion in the receiver performance, caused by the Traveling Wave Tube Amplifier (TWTA), in a satellite receiver devoted to broadcasting. We have evaluated the performance for the DVB-S2 modulations, but the proposed DFE can be easily extended to be used in DVB-S2X systems. In our previous work we have presented the performance gains when using the same DFE to tackle the Inter-Symbol-Interference (ISI) caused by the Land Mobile Satellite Channel (LMSC). In that work, we have presented prototyping results in FPGA targeting a ASIC implementation. In this work we also investigate the performance improvements of the proposed DFE to tackle the effects of the nonlinearity combined with the ISI. The simulations results have shown that the proposed equalizer is capable of bringing significant performance improvements in both cases, i.e pure nonlinearity and nonlinearity combined with ISI, specially for the higher order modulation. It is worth mentioning that our proposal does not deal with the out-of-band spurious emissions caused by the nonlinear distortion, which needs to be handled by an appropriate technique such as predistortion.

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“…It was shown in the literature the potential of using such approach [126], but further studies shall be done to increase the BER vs. SNR gains, specially for multilevel modulations such as 16-APSK, 32-APSK and those specified in DVB-S2X amendment. 295…”

Section: Discussionmentioning

confidence: 99%

“…Especially when using PilotBased combined with and DD training. Instead of CMA, as used in this work, the results presented in [126] suggests that Generalized Multilevel Constant Module Algorithm can be used.…”

Section: The Proposed Dvb-s2 Receiver Architecture and Algorithmsmentioning

confidence: 99%

“…A traditional way to deal with those effects is by means of pre-distortion techniques. Nevertheless, in [126], the authors have shown the potential of using a nonlinear Adaptive Equalizer, such as the DFE, to improve the receiver performance in the presence of those impairments. In this section, the performance enhancements the proposed Adaptive Equalizer can bring to a DVB-S2 receiver in the presence of the nonlinear distortion, caused by the TWTA, are evaluate by means of simulations.…”

Section: The Proposed Dvb-s2 Receiver Architecture and Algorithmsmentioning

confidence: 99%

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Architecture and algorithms for the implementation of digital wireless receivers in FPGA and ASIC: ISDB-T and DVB-S2 cases

Lima¹

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A Study of Adaptive Equalizer for APSK in the Satellite Broadcasting System

Cited by 5 publications

References 7 publications

An adaptive equalizer for reliable transmissions in DVB-S2 satellite communications under ISI

An adaptive equalizer for reliable transmissions in DVB-S2 satellite communications under ISI

An Adaptive Equalizer to Reduce the Nonlinear Distortion Effects in Satellite Broadcasting Systems

Architecture and algorithms for the implementation of digital wireless receivers in FPGA and ASIC: ISDB-T and DVB-S2 cases

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