Orthogonal frequency division multiplex systems

Details Orthogonal frequency division multiplex systems Orthogonal frequency division multiplex systems

1997-06-17

2000-07-11

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375348, 370210, 370206, H04L 526, H04L 2508, H04L 2726

Patent

active

060883987

ABSTRACT:
A method and apparatus increase a maximum available bit rate on a single data link, in order to gain capacity within single cells. An orthogonal frequency division multiplex signal is filtered by a pulse shaping operation so as to suppress side lobes of the signal. This pulse shaping introduces known inter symbol interference (ISI) and loses orthogonality between subcarriers. However, a receiver utilizes the idea of overcoming ISI by applying equalization to the signal such that the loss of orthogonality is overcome.

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B. Engstrom, WW3-BAI/020/94, pp. 1-5, "A Class of OFDM Pulse Shapes," Nov. 10, 1994.
M. Gudmundson, et al., WW3/BAI/ERA-002, pp. 1-16, "First Results on Transmission Studies," Sep. 29, 1994.
M. Gudmundson, WW3-BAI/047/95, pp. 1-9, "RF Considerations of OFDM Signals," Mar. 23, 1995.
M. Gudmundson, WW3-BAI/047/95, pp. 1-9, "RF Considerations on OFDM Signal Transmissions," Apr. 3, 1995.
P. Willars, WW3/BAI-049/95, pp. 1-15, "A Comparison of Multiple Access Concepts," Mar. 23, 1995.

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