Quantization Noise and Distortion Analysis of Envelope Pulse-Width Modulation (EPWM) Transmitters for OFDM Signal Amplification

Umali, Edwin M.; Kawazoe, Koji; Yamao, Yasushi

doi:10.1587/transfun.e93.a.1724

Cited by 5 publications

(3 citation statements)

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“…Oversampling ratio is defined as the ratio of oversampling frequency to basic sampling frequency. Clipping probability determines the clipping level of Δ − Σ modulator for an input signal [6]. To identify the MZ modulator transmission function and make the simulation results fit to actual situation, we conducted an experiment to measure the characteristic of MZ modulator.…”

Section: ) Simulated Results For Ofdm Input Signalmentioning

confidence: 99%

“…1 [5,6]. The input signal is converted into amplitude and phase components by a complex envelop generator.…”

Section: A Epwm Transmittermentioning

confidence: 99%

“…The control is performed by using a clipping ratio of max / E σ [6], where max E is the step-size of Δ − Σ modulator and σ is the normalized amplitude corresponding to the average power of the OFDM signal.…”

Section: T T a T Q T A T H T Q Tmentioning

confidence: 99%

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OFDM Signal Transmission by EPWM Transmitter in Nonlinear RoF Channel

Matsuura

Yokozawa

et al. 2012

2012 IEEE 75th Vehicular Technology Conference (VTC Spring)

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Radio-over-Fiber (RoF) technology enables low-loss distribution of RF signals over optical fiber, which contributes much for spreading broadband wireless access services into inbuilding areas and outdoor dead-spots. However, current broadband wireless access systems employ OFDM schemes and suffer from nonlinear distortion of the RoF channel due to nonlinearity inherent in Electrical to Optical (E/O) conversion. In this paper, a new RoF transmission scheme employing Envelop Pulse-Width Modulation (EPWM) transmitter has been proposed to efficiently suppress the impact of RoF channel nonlinearity on OFDM signals. This idea is executed in a typical RoF channel that uses a Mach-Zehnder modulator as its E/O convertor. It is proved by both simulation and experiment that the EPWM-RoF scheme can achieve linear transmission of OFDM signal via nonlinear RoF channel.

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Section: ) Simulated Results For Ofdm Input Signalmentioning

confidence: 99%

“…1 [5,6]. The input signal is converted into amplitude and phase components by a complex envelop generator.…”

Section: A Epwm Transmittermentioning

confidence: 99%