Method to create hierarchical modulation in OFDM

Details Method to create hierarchical modulation in OFDM Method to create hierarchical modulation in OFDM

2007-06-12

2007-06-12

Phu, Phuong (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S341000, C375S261000, C370S207000

Reexamination Certificate

active

10995946

ABSTRACT:
The present invention involves a method for transmitting data using an orthogonal frequency division multiplex (OFDM) transmission system, such as over a terrestrial network used in satellite digital audio radio. A OFDM signal is generated based on first input data. A variation is introduced in the OFDM signal based on second input data to generate a modified OFDM signal which is transmitted. The modified OFDM signal is decoded by performing a demodulation of the modified OFDM signal then a first and second detection to obtain the first input data and the second input data. The introduction of a variance may include introducing an additional phase offset across adjacent OFDM sub-carriers, across adjacent OFDM symbols, an additional phase offset in the OFDM signal, an additional amplitude offset in the OFDM signal, an additional amplitude augmentation in the OFDM signal, and/or a second variation in the first OFDM signal based on third input data.

REFERENCES:
patent: 5646935 (1997-07-01), Ishikawa et al.
patent: 5687166 (1997-11-01), Natali et al.
patent: 5771224 (1998-06-01), Seki et al.
patent: 5903546 (1999-05-01), Ikeda et al.
patent: 5966412 (1999-10-01), Ramaswamy
patent: 6119827 (2000-09-01), Militello et al.
patent: 6510317 (2003-01-01), Marko et al.
patent: 6570858 (2003-05-01), Emmons, Jr. et al.
patent: 6996418 (2006-02-01), Teo et al.
patent: 2005/0005120 (2005-01-01), Kahn et al.
patent: 0594505 (1993-10-01), None
patent: 2004100479 (2004-11-01), None
Vitthaladevuni, et al.; “Exact BER Computation of Generalized Hierarchial PSK Constellations”; IEEE Feb. 2002, pp. 1974-1978.
J. Sesna; The DVB satellite, cable and SMATV systems; EBU Technical Review; Winter 1995; pp. 24-38.
Tanner; UBS Looks Southward, UBS, a Canadian Developer of MMDS Equipment, Has Its Eyes on the U.S.; Aug. 2001; www.shorecliffcommunications.com, Broadband Wireless Online, pp. 1-6.
Yoshida; New DVB satelline modulation scheme drops Turbo; Mar. 7, 2003; EETIMESUK, www.electronicstimes.com; p. 1.
Schertz, Weck; Hierarchical modulation-the transmission of two independent DVB-T multiplexes on a single frequency; EBU Technical review; Apr. 2003; pp. 1-13.
DVB Digital Video Broadcasting; DVB, MHP, the DVB logo and the MHP logo are registered trademarks of the Digital Video Broadcasting Project.
Pursley, et al.; “Adaptive Nonuniform Phase-Shift-Key Modulation For Multimedia Traffic in Wireless Networks”; IEEE Journal on Selected Areas in Communications, vol. 18, No. 8, Aug. 2000; pp. 1394-1407.
Vitthaladevuni, et al.; Effect of Imperfect Phase and Timing Synchronization on the Error Rate Performance of PSK Modulations; IEEE Mar. 2002; pp. 356-360.
Hossain, et al.; Hierarchial Modulations for Multimedia and Multicast Transmission over Fading Channels; IEEE Mar. 2003; pp. 2633-2637.
Pursley, et al.; “Nonuniform Phase-Shift-Key Modulation for Multimedia Multicast Transmission in Mobile Wireless Networks”; IEEE Journal on Selected Areas in Communications, vol. 17, No. 5, May 1999, pp. 774-783.

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