Method and apparatus for increasing data rates in a wideband...

Details Method and apparatus for increasing data rates in a wideband... Method and apparatus for increasing data rates in a wideband...

2007-10-23

2007-10-23

Lugo, David B. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C370S464000

Reexamination Certificate

active

10427694

ABSTRACT:
A system and method for the efficient transmission of information in a code division multiple access (CDMA) wireless telecommunication system. To increase the rate of reliable transmission, an orthogonal frequency-division multiplexing (OFDM) scheme is implemented in a direct-spread CDMA network, this combination sometimes being referred to as multi-carrier CDMA (MC-CDMA). Information (such as voice and data), interspersed with a known pilot signal, is encoded and spread across the frequency domain, rather than the time domain as in traditional CDMA; the allowable transmission bandwidth is divided into a number of carriers. To achieve even larger transmission rates, the guardband between carriers is eliminated. To prevent interference, the number of pilot transmissions is reduced and a corresponding number of frequency bins at the border of an OFDM block are loaded with zeros. The receiver simply ignores these subcarriers when reconstructing the transmitted signal.

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Part I: Fourier Transforms and Sampling, http://www.silcom.com/˜aludwig/Signal—processing/Signal—processing.htm ; available Oct. 17, 2005, 11 pages.

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