Multi-carrier OFDM UWB communications systems

Details Multi-carrier OFDM UWB communications systems Multi-carrier OFDM UWB communications systems

2004-05-24

2010-10-05

Payne, David C (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S347000, C370S436000, C370S466000, C370S468000

Reexamination Certificate

active

07809067

ABSTRACT:
The present invention, generally speaking, provides for signaling methods in which multiple sub-hands of a transmission band are continuously occupied by an OFDM signal that would otherwise occupy only a single sub-hand. In accordance with one embodiment, steps include producing an OFDM symbol; transforming the OFDM symbol to produce an OFDM signal; upsampling the OFDM signal to produce an upsampled OFDM signal; applying a pseudo-random code to the upsampled OFDM signal to produce a coded OFDM signal; and upconverting the coded OFDM signal to produce a radio frequency signal. In accordance with another embodiment, steps include producing a sequence of N consecutive identical OFDM symbols; transforming the OFDM symbols to produce corresponding OFDM signals; and upconverting the coded OFDM signal to produce a radio frequency signal; wherein the radio frequency signal occupies N sub-hands of a transmission band.

REFERENCES:
patent: 2004/0151109 (2004-08-01), Batra et al.
patent: 2004/0228269 (2004-11-01), Balakrishnan et al.
patent: 2005/0163235 (2005-07-01), Mo et al.
patent: 1 045 531 (2000-10-01), None
Anuj Batra et al. “Multi-band OFDM Physical Layer Proposal for IEE 802.15 Task Group 3a” Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs), Nov. 2003, p. 6,7 ,31-38.
Vanderdorpe I: “Multitone spread sectrum multiple access communications system in a multipath rician fading channel” IEEE Transactions on Vehicular Technology, IEEE Inc. New York, US, May 1995, vol. 44, No. 2, pp. 327-337.
Anuj Batra et al. “multi-band OFDM physical layer proposal for IEEE 802.15 task group 3a” project; IEEE p802.15 working group for wireless personal area networkds (WPANs), Nov. 2003, pp. 1-38.
Vandendorpe L: “Multitone Spread Spectrum Multiple Access Communications System in a Multipath Rician Fading Channel” IEEE Transactions on Vehicular Technollogy, IEEE Inc. New York, NY, vol. 44., No. 2, May 1995.

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