Orthogonal frequency division multiplex modem circuit

Details Orthogonal frequency division multiplex modem circuit Orthogonal frequency division multiplex modem circuit

2006-05-25

2010-11-30

Phunkulh, Bob A (Department: 2477)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S210000, C375S260000

Reexamination Certificate

active

07843803

ABSTRACT:
To provide an orthogonal frequency division multiplex modem circuit which can multiplex signals, whose bit rates and QoS are different from one another, and can transmit the signals via one OFDM line. A serial/parallel converter converts input signals into a complex parallel signal respectively, and a sub carrier and a modulation system are assigned every communication channel. A randomizer changes the alignment sequence of the signal, a discrete inverse Fourier transformer processes the signal, a parallel/serial converter converts the signal into a serial signal, and a transmitter performs the orthogonal modulation of the signal to output the signal from an antenna. A receiver performs orthogonal demodulation of the signal received with an antenna, a serial/parallel converter converts the signal into a parallel signal, and a discrete Fourier transformer processes the parallel signal. In addition, a de-randomizer restores the alignment sequence of the subcarriers into the original condition, and a parallel/serial converter decodes and outputs the signal.

REFERENCES:
patent: 5488632 (1996-01-01), Mason et al.
patent: 5555268 (1996-09-01), Fattouche et al.
patent: 5771224 (1998-06-01), Seki et al.
patent: 6038450 (2000-03-01), Brink et al.
patent: 6192068 (2001-02-01), Fattouche et al.
patent: 6195534 (2001-02-01), Sakoda et al.
patent: 6246713 (2001-06-01), Mattisson
patent: 6397368 (2002-05-01), Yonge, III et al.
patent: 6400781 (2002-06-01), Vandendorpe et al.
patent: 6430148 (2002-08-01), Ring
patent: 6442129 (2002-08-01), Yonge, III et al.
patent: 6542460 (2003-04-01), Ring
patent: 6628673 (2003-09-01), McFarland et al.
patent: 6726297 (2004-04-01), Uesugi
patent: 6807146 (2004-10-01), McFarland
patent: 6816453 (2004-11-01), Sakamoto
patent: 1218358 (1999-06-01), None
patent: 0753947 (1997-01-01), None
patent: 0 891 067 (1999-01-01), None
patent: 902551 (1999-03-01), None
patent: 2332603 (1999-06-01), None
patent: 8-331093 (1996-12-01), None
patent: 10-336139 (1998-12-01), None
patent: 11-266224 (1999-09-01), None
patent: 11-317723 (1999-11-01), None
patent: 2000-92009 (2000-03-01), None
patent: 2000-0029653 (2000-05-01), None
patent: WO 96/37062 (1996-11-01), None
patent: WO 97/48197 (1997-12-01), None
patent: WO 98/57472 (1998-12-01), None
Wong et al., “Multiuser OFDM With Adaptive Subcarrier, Bit and Power Allocation”, IEEE Journal on Selected Areas in Communications, vol. 17, No. 10, Oct. 1999, pp. 1747-1758.
Suhas N. Diggavi, “Multiuser DMT: A Multiple Access Modulation Scheme”, IEEE, 1996, pp. 1566-1570.
Sollenberger, et al., “Receiver Structures for Multiple Access OFDM”, IEEE, pp. 468-472, 1999.
Longxiang, et al, “The Adaptive Modulation Technology for High Capacity Wireless TDMA Communications Systems”, pp. 27-29, 1999, (www.cnki.net.).
Hoo et al., “Digital Dual Qos Loading Algorithms for Multicarrier Systems”, IEEE International Conference, vol. 2, Jun. 6-10, 1999 (pp. 796-800, vol. 2.
Kunihiro, Takushi et al., “BDMA Testbed-Configuration and Performance Results”, Vehicular Technology Conference (1999) IEEE, pp. 1836-1840.

Affiliated with

Also associated with

Rating

Orthogonal frequency division multiplex modem circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Orthogonal frequency division multiplex modem circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orthogonal frequency division multiplex modem circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4168150