Multiple user communication system, device and method with overl

Details Multiple user communication system, device and method with overl Multiple user communication system, device and method with overl

1996-04-26

1998-10-27

Pham, Chi H.

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370343, H04J 102

Patent

active

058286608

ABSTRACT:
The present invention provides a method, system, subscriber unit, and base/headend unit for a bandwidth efficient multiple user digital communication system that facilitates multiple user reverse link communication using overlapped transmit signal spectra of at least two overlap bandwidth subscriber units. Overlap bandwidth subscriber units receive a forward link signal, each deriving a frequency reference from the forward link signal and a symbol timing reference from the forward link signal, and transmitting a reverse link signal to the base/headend unit that receives a composite reverse link signal of the reverse link signals. Each reverse link signal includes at least one modulated data carrier with distinct carrier frequencies. Each transmitted reverse link signal has a symbol timing responsive to the symbol timing reference, and the frequency spectra of the reverse link signals overlap using overlapped transmit signal spectra of at least two overlap bandwidth subscriber units.

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"Analysis and Simulation of a Digital Mobile Channel Using Orthoganal Frequency Division Multiplexing", Leonard J. Cimini, Jr IEEE Transactions on communications, vol. Com-33, No. 7, Jul. 1985, pp. 665-675.
"Frequency Synchronization Algorithms for OFDM Systems suitable for Communication over Frequency Selective Fading Channels", Ferdinand Classen, Heinrich Meyer, 1994 IEEE, pp. 1655-1659.

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