Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published May 2003 | Published
Book Section - Chapter Open

On the average power of multiple subcarrier intensity modulated optical signals: Nehari's problem and coding bounds

Abstract

Multiple subcarrier modulation (MSM) is an attractive technique for optical wireless communication for high speed applications. The main disadvantage of this scheme is its low average power efficiency which is an analogous problem to the high peak to mean envelope power ratio (PMEPR) of multicarrier signals. In this paper, we consider the achievable average power reduction of MSM signals by using optimized reserved carriers and coding methods. Based on Nehari's result we present a lower bound for the maximum average power of the signal after adding the reserved carriers. It is shown that the mean value of the average required power behaves very close to √2n log log n for a BPSK constellation where n is the number of subcarriers. We then consider finding the optimum values for the carriers and the effect of having finite bandwidth for reserved carriers. In the next section, mainly based on recent coding results for the PMEPR of multicarrier signals, we show the existence of very high rate codes with average power of O(√n log n) for large values of n, and furthermore the existence of codes with non-vanishing to zero rate and average power of O(√n) asymptotically.

Additional Information

© 2003 IEEE. Reprinted with Permission. Publication Date: 11-15 May 2003. Posted online: 2003-06-11. This work was supported in part by the National Science Foundation under grant no. CCR-0133818, by the office of Naval Research under grant no. N00014-02-1-0578, and by Caltech's Lee Center for Advanced Networking.

Attached Files

Published - SHAicc03.pdf

Files

SHAicc03.pdf
Files (316.0 kB)
Name Size Download all
md5:0a76ef9c53a98c13a39bfc00a142fcf9
316.0 kB Preview Download

Additional details

Created:
August 22, 2023
Modified:
March 5, 2024