Outage capacity of pulsed-OFDM ultra wideband communications

Pulsed-OFDM is a novel modulation scheme proposed to enhance the baseline multi-band OFDM proposal for the IEEE 802.15.3a wireless personal area networks. Pulsating the OFDM symbols spreads the spectrum of the modulated signals in the frequency domain, leading to enhanced performance in multipath fading environments and reduced complexity and power consumption for transceivers. We study the information theoretic aspects of the pulsed-OFDM system. We provide formulas for average capacity and capacity versus outage probability characteristics in Rayleigh fading channels and use these formulas to determine the optimum spreading factor for the pulsed-OFDM system in a given channel condition. We also show that the optimum spreading factor is a function of the signal-to-noise ratio and capacity versus outage probability characteristics of the channel.

[1]  Anuj Batra,et al.  Multi-band OFDM Physical Layer Proposal , 2003 .

[2]  Shlomo Shamai,et al.  Information theoretic considerations for cellular mobile radio , 1994 .

[3]  A. H. Tewfik,et al.  Pulsed and non-pulsed OFDM ultra wideband wireless personal area networks , 2003, IEEE Conference on Ultra Wideband Systems and Technologies, 2003.

[4]  Georgios B. Giannakis,et al.  Wireless multicarrier communications , 2000, IEEE Signal Process. Mag..

[5]  Shlomo Shamai,et al.  Fading Channels: Information-Theoretic and Communication Aspects , 1998, IEEE Trans. Inf. Theory.

[6]  Ebrahim Saberinia,et al.  High bit rate ultra-wideband OFDM , 2002, Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE.

[7]  Alan V. Oppenheim,et al.  Digital Signal Processing , 1978, IEEE Transactions on Systems, Man, and Cybernetics.