Method of using guard tones in OFDM systems for increasing...

Details Method of using guard tones in OFDM systems for increasing... Method of using guard tones in OFDM systems for increasing...

2005-05-10

2010-11-09

Jain, Raj K (Department: 2472)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

Reexamination Certificate

active

07830782

ABSTRACT:
The present invention provides a method and system for increasing communication robustness between wireless communication devices by transmitting data on Orthogonal Frequency Division Multiplexing (OFDM) guard tones. In one embodiment, punctured bits are sent on the guard tones. In an alternate embodiment, the full bandwidth provided by the guard tones in used to determine the optimal puncture pattern. The present invention can also use guard tones to duplicate data from those tones which are experiencing channel interference. The receiver feeds back information about tones in interference, and the transmitter send the interfered data on the guard tones. Guard tones are used for sending feedback information to the transmitter in order to increase system robustness. This provides the transmitter with information on how to use the guard tones and adapt the transmission data rates to maximize system performance.

REFERENCES:
patent: 6510133 (2003-01-01), Uesugi
patent: 6775254 (2004-08-01), Willenegger et al.
patent: 2004/0131022 (2004-07-01), Ito
patent: 2004/0170217 (2004-09-01), Ho
Weinstein et al., “Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform”, IEEE Transactions on Communication Technology, vol. COM-19, No. 5, Oct. 1971, pp. 628-634.
IEEE 802.15.3, “Part 15.3: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for High Rate Wireless Personal Area Networks (WPANs),” IEEE Computer Society, 2003.

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