InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,570,921
Sugar , et al. August 4, 2009

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Systems and methods for improving range for multicast wireless communication


Abstract
Methods to optimize range of multicast signal communication in wireless communication applications that use range-enhanced techniques for directed signal communication. A multicast signal may be sent multiple times through each of a plurality of independent omnidirectional transmit antennas of a communication device to a plurality of other communication devices to improve packet error rate (PER) at a given range (i.e., SNR). More generally, the multicast message can be transmitted up to N times using up to N times using any set of N complex linearly independent N-dimensional transmit weight vectors v.sub.i, . . . , v.sub.N associated with N plurality of transmit antennas that meets the power constraint .parallel.v.sub.i.parallel..sup.2=1, i=0, . . . , N-1, where the vector v.sub.i, is used for the ith transmission of the multicast signal.


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Inventors: Sugar; Gary L. (Rockville, MD), Vaidyanathan; Chandra (Bethesda, MD)
Assignee: IPR Licensing, Inc. (Wilmington, DE)

Appl. No.: 10/855,279
Filed: May 27, 2004

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Related U.S. Patent Documents

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Application Number Filing Date Patent Number Issue Date
10174690 Jun., 2002 6862456
60361055 Mar., 2002
60365774 Mar., 2002


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Current U.S. Class: 455/63.4 ; 455/41.2; 455/510; 455/562.1
Current International Class: H04B 1/00 (20060101); H04B 15/00 (20060101)
Field of Search: 455/562.1,510,509,41.2,63.4,69