Method and system for multirate multiuser modulation

Details Method and system for multirate multiuser modulation Method and system for multirate multiuser modulation

2006-11-21

2006-11-21

Ngo, Ricky Q. (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S330000, C370S430000

Reexamination Certificate

active

07139237

ABSTRACT:
A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between users at different data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between users having different data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.

REFERENCES:
patent: 6067326 (2000-05-01), Jonsson et al.
patent: 6473418 (2002-10-01), Laroia et al.
patent: 6522700 (2003-02-01), Zimmermann et al.
patent: 6898198 (2005-05-01), Ryan et al.
Michael Schnell and Isabella De Broeck; “Application of IFDMA to Mobile radio Transmission”; IEEE International Conference on Universal Personal Communications, ICUPC, 1998; vol. 2; pp. 1267-1272.
Uli Sorger, Isabella De Broech and Michael Schnell; “Interleaved FDMA—A New Spread-Spectrum Multiple-Access Scheme”; IEEE International Conference on Communications, ICC 1998, vol. 2; pp. 1013-1017.
Michael Schnell and Isabella De Broech; “Interleaved FDMA: Equalization and Coded Performance in Mobile Radio Applications”; IEEE International Conference on Communications, ICC 1999; vol. 3; pp. 1939-1944.

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