The evaluation for required bit resolution of digital-analog-converter in optical OFDM signal generation

Hidenori Takahashi; Itsuro Morita; Hideaki Tanaka

doi:10.1587/transcom.E94.B.425

The evaluation for required bit resolution of digital-analog-converter in optical OFDM signal generation

Hidenori Takahashi^*, Itsuro Morita, Hideaki Tanaka

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

The required bit resolution of digital-analog-converter (DAC) for optical OFDM was evaluated through simulation and experiment. We found that the signal degradation caused by quantization depends on the number of subcarriers theoretically, but the other noise generated in experiment suppresses the dependency. Additionally, signal degradation caused by quantization is independent of subcarrier modulation, and the performance improvement saturates with increasing bit resolution. With the criteria for the BER of 1 ×10^-3, the required DAC resolution by simulation with ideal analog-digital-converter at receiver is 3 bits for QPSK, 4 bits for 8-QAM and 5 bits for 16-QAM and 32-QAM. From the experimental result, the required bit resolution is increased as 6 bits for 32-QAM.

Original language	English
Pages (from-to)	425-429
Number of pages	5
Journal	IEICE Transactions on Communications
Volume	E94-B
Issue number	2
DOIs	https://doi.org/10.1587/transcom.E94.B.425
Publication status	Published - 2011 Feb
Externally published	Yes

Keywords

DAC
OFDM
Resolution

ASJC Scopus subject areas

Software
Computer Networks and Communications
Electrical and Electronic Engineering

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10.1587/transcom.E94.B.425

Cite this

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abstract = "The required bit resolution of digital-analog-converter (DAC) for optical OFDM was evaluated through simulation and experiment. We found that the signal degradation caused by quantization depends on the number of subcarriers theoretically, but the other noise generated in experiment suppresses the dependency. Additionally, signal degradation caused by quantization is independent of subcarrier modulation, and the performance improvement saturates with increasing bit resolution. With the criteria for the BER of 1 ×10-3, the required DAC resolution by simulation with ideal analog-digital-converter at receiver is 3 bits for QPSK, 4 bits for 8-QAM and 5 bits for 16-QAM and 32-QAM. From the experimental result, the required bit resolution is increased as 6 bits for 32-QAM.",

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AB - The required bit resolution of digital-analog-converter (DAC) for optical OFDM was evaluated through simulation and experiment. We found that the signal degradation caused by quantization depends on the number of subcarriers theoretically, but the other noise generated in experiment suppresses the dependency. Additionally, signal degradation caused by quantization is independent of subcarrier modulation, and the performance improvement saturates with increasing bit resolution. With the criteria for the BER of 1 ×10-3, the required DAC resolution by simulation with ideal analog-digital-converter at receiver is 3 bits for QPSK, 4 bits for 8-QAM and 5 bits for 16-QAM and 32-QAM. From the experimental result, the required bit resolution is increased as 6 bits for 32-QAM.

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The evaluation for required bit resolution of digital-analog-converter in optical OFDM signal generation

Abstract

Keywords

ASJC Scopus subject areas

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