Influence of time and processing mismatches between phase and envelope signals in linearization systems using envelope elimination and restoration, application to Hiperlan2

Baudoin, Geneviève; Berland, Corinne; Villegas, Martine; Diet, Antoine

doi:10.1109/mwsym.2003.1210588

Cited by 19 publications

(17 citation statements)

References 2 publications

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“…Therefore, the theoretical performances of the architecture are degraded. We already reported [3] the degradation of performances due to this time mismatch, in terms of EVM and spectral regrowths. We also proposed [4] a Monte-Carlo evaluation of these envelope/phase delays influences on an OFDM signal and on the overall performance.…”

Section: Impact Of the Desyncrhonisation Of Phase And Envelope Simentioning

confidence: 97%

“…Fig.2 present the impact of the delay for the OFDM modulation on the output spectrum. This delay creates a rotation of the emitted constellation proportional to the subcarrier frequency offset from the nominal carrier frequency and also proportional to the delay itself [3]. For 10ns, the phase shift can attain 8.5 degrees and EVM is about 30%.…”

Section: Impact Of the Desyncrhonisation Of Phase And Envelope Simentioning

confidence: 99%

“…Few studies were presented concerning the specification of such a solution applied to complex modulations [3]. This paper concerns the sensibility analysis of the EER on the following points: signals bandwidth, impact of the envelope restoration, impact of the desynchronisation between the two path, etc… These studies pointed up that the critical specification is the synchronization of signals.…”

Section: Introductionmentioning

confidence: 99%

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Envelope/phase delays correction in an EER radio architecture

Bercher¹,

Berland²

2006

2006 13th IEEE International Conference on Electronics, Circuits and Systems

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Section: Impact Of the Desyncrhonisation Of Phase And Envelope Simentioning

confidence: 97%

Section: Impact Of the Desyncrhonisation Of Phase And Envelope Simentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Envelope/phase delays correction in an EER radio architecture

Bercher¹,

Berland²

2006

2006 13th IEEE International Conference on Electronics, Circuits and Systems

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“…With additional component imperfections, such as I/Q modulator mismatch and synthesizer phase noise both impacting EVM of about 5%, the global EVM value is too high for radiocommunication systems [6]. This implies that the limits of this solution have been reached.…”

Section: B Transmitter Performancesmentioning

confidence: 99%

“…Bandwidths of the envelope and phase signals are also large, the former above 60 MHz and the latter above 80 MHz [6]. Such characteristics would tighten the transmitter's specification and so point up its limitations in comparison with the 16 QAM.…”

Section: Preliminary-introduction To Ofdm Modulationmentioning

confidence: 99%

A transmitter architecture for nonconstant envelope modulation

Berland

Hibon

Bercher

et al. 2006

IEEE Trans. Circuits Syst. II

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Abstract-This paper presents a transmitter architecture which is less sensitive to power amplifier AM/AM and AM/PM conversions. Indeed, most radio communication standards employ nonconstant envelope modulation such as in the 802.11 series. Owing to power amplifiers' nonlinearities, distortions on the modulations degrade the overall transmitter performance. As a consequence, linearization methods, such as envelope elimination and restoration, have to be employed. The architecture relies on the transformation of a nonconstant envelope modulation to a constant or switched one. This signal coding enables the efficient amplification of the signal without undergoing power amplifier distortions. The envelope variation is restored by bandpass filtering just after the power amplifier.

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Envelope and phase delays correction in an EER radio architecture

Bercher

Berland

2008

Analog Integr Circ Sig Process

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This article deals with synchronization in the Envelope Elimination and Restoration (EER) type of transmitter architecture. To illustrate the performances of such solution, we choose to apply this architecture to a 64 carriers 16QAM modulated OFDM. We first introduce the problematic of the realisation of a highly linear transmitter. We then present the Envelope Elimination and Restoration solution and draw attention to its major weakness: a high sensitivity to desynchronization between the phase and envelope signal paths. To address this issue, we propose an adaptive synchronization algorithm relying on a feedback loop, a Least Mean Square formulation and involving an interpolation step. It enables the correction of delay mismatches and tracking of possible variations. We demonstrate that the quality of the interpolator has a direct impact on Error Vector Magnitude (EVM) value and output spectrum. Implementation details are provided along with an analysis of the behaviour and performances of the method. We present Agilent-ADS and Matlab simulation results and then focus on the enhancement of the transmitter performances using the proposed algorithm.

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Influence of time and processing mismatches between phase and envelope signals in linearization systems using envelope elimination and restoration, application to Hiperlan2

Cited by 19 publications

References 2 publications

Envelope/phase delays correction in an EER radio architecture

Envelope/phase delays correction in an EER radio architecture

A transmitter architecture for nonconstant envelope modulation

Envelope and phase delays correction in an EER radio architecture

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