Dr. Roy You Profile

Dr. Roy You

at Univ of California Berkeley

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Proceedings Article | 6 December 2002 Paper

Power-efficient multiple-subcarrier modulation scheme for optical wireless communications

Byron Yu, Joseph Kahn, Roy You

Proceedings Volume 4873, (2002) https://doi.org/10.1117/12.455506

KEYWORDS: Modulation, Wireless communications, Frequency division multiplexing, Distortion, Binary data, Phase shift keying

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Multiple-subcarrier modulation (MSM) offers several potential advantages for optical wireless systems. MSM makes it possible to perform frequency-division multiplexing, while maintaining the simplicity of intensity modulation and direct detection. Indoor optical wireless systems may be subject to multipath distortion; in such systems, MSM enables transmission at high bit rates with minimal intersymbol interference. The average-power efficiency of MSM is lower than that of baseband modulation techniques, such as on-off-keying or pulse-position modulation, however. We present a technique for improving the average-power efficiency of multiple-subcarrier systems using binary or quadrature phase-shift keying (BPSK, QPSK) with bandlimited pulses, which are, necessarily, not time-limited. In order to insure the non-negativity of the transmitted intensity signal, we use a time-varying bias signal, which is a baseband pulse-amplitude modulation signal also using these pulses. We focus on the problem of designing this time-varying bias signal, which is complicated by the fact that the pulses are not time-limited. We show that the proposed scheme can significantly enhance power efficiency, with only a minimal increase in implementation complexity.

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