Sharif, Masoud and Hassibi, Babak (2003) On the average power of multiple subcarrier intensity modulated optical signals: Nehari's problem and coding bounds. In: IEEE International Conference on Communications, (ICC '03), Anchorage, AK, 11-15 May 2003. IEEE , Piscataway, NJ, pp. 2969-2973. ISBN 0780378024 http://resolver.caltech.edu/CaltechAUTHORS:SHAicc03
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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.
|Item Type:||Book Section|
|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.|
|Subject Keywords:||encoding; intensity modulation; optical communication; optical modulation; phase shift keying; Nehari coding bounds; average power; average power reduction; coding methods; dummy tones; intensity modulated optical signals; multicarrier signals; multiple subcarrier; multiple subcarrier modulation; optical wireless communication; peak to mean envelope power ratio; phase shift keying; power efficiency; reserved carriers|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Kristin Buxton|
|Deposited On:||12 Mar 2008|
|Last Modified:||26 Dec 2012 09:52|
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