Adaptive subcarrier loading

Details Adaptive subcarrier loading Adaptive subcarrier loading

2007-05-11

2010-11-16

Dean, Raymond S (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

C455S039000, C455S042000, C455S091000, C455S095000, C455S102000, C455S112000, C375S295000, C375S298000, C375S300000, C375S302000

Reexamination Certificate

active

07835696

ABSTRACT:
A wireless multicarrier transmission method in which a multicarrier transmission uses n modulated frequency subcarriers (n is an integer number), and a fading condition of each subcarrier is detected to generate fading channel profile information. The modulation of each subcarrier includes selecting a standard modulation scheme, a lower modulation scheme, and a higher modulation scheme; selecting three integer numbers x, y, and z representing the number of subcarriers for modulation with the lower modulation scheme, with the standard modulation scheme, and with the higher modulation scheme respectively, the sum of x, y, and z is n and a resulting number of coded bits of a multicarrier symbol is constant; and modulating the x subcarriers having low fading channel profile information with the lower modulation scheme, modulating the y subcarriers having medium fading channel profile information with the standard modulation scheme, and modulating the z subcarriers having high fading channel profile information with the higher modulation scheme.

REFERENCES:
patent: 5726978 (1998-03-01), Frodigh et al.
patent: WO 97/44925 (1997-11-01), None
patent: WO 99/30465 (2000-06-01), None
Adaptive modulation techniques for duplex OFDM transmission Keller, T.; Hanzo, L.; Vehicular Technology, IEEE Transactions on vol. 49, Issue 5, Sep. 2000 pp. 1893-1906.
T. Keller et al: “Adaptive Multicarrier Modulation: A Convenient Framework for Time-Frequency Processing in Wireless Communications” Proc. IEEE (USA), Proceedings of the IEE, vol. 88, No. 5 May 2000, pp. 611-640, XPOO2171294.
Hamaguchi K et al: Performance of Multicarrier/QAM-Level-Controlled Adaptive Modulation for Land Mobile Communication Systems: IEICE Transactions on Communications, JP, Institute of Electronics Information and Comm. Eng Tokyo, vol. E81-B, No. 4, Apr. 1, 1998, pp. 770-775. XP000780472.
M. Giacomo: “Analysis and Comparision of Different Modulation Methods for Wireless Broadband Indoor Link” Cefriel, Online, Jun. 2000, pp. 1-15, XP002171295.
R. Grünheid et al: “Adaptive Modulation for the Hiperlan/2 Air Interface” 5thInternational OFDM Workshop 2000, Online, Sep. 2000, pp. 4-1-4-4, XP002171296.
T. Keller, T,: Hanzo, L.ioDvehicular Technology, IEEE Transactions on, vol. 49, Issue: 5, Sep. 2000 pp. 1893-1906.
Krongold et al, “Computationally Efficient Optimal Power Allocation Algorithms for Multicarrier Communication Systems,” IEEE Transactions on Communications, vol. 48, No. 1, 2000, pp. 23-27.

Affiliated with

Also associated with

Rating

Adaptive subcarrier loading does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive subcarrier loading, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive subcarrier loading will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4192457