Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2001-04-20
2008-07-08
Odom, Curtis (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S135000, C375S141000, C375S146000
Reexamination Certificate
active
07397859
ABSTRACT:
A multi-carrier communication system such as an OFDM or DMT system has nodes which are allowed to dynamically change their receive and transmit symbol rates, and the number of carriers within their signals. Changing of the symbol rate is done by changing the clocking frequency of the nodes' iFFT and FFT processors, as well as their serializers and deserializers. The nodes have several ways of dynamically changing the number of carriers used. The selection of symbol rate and number of carriers can be optimized for a given channel based on explicit channel measurements, a priori knowledge of the channel, or past experience. Provision is made for accommodating legacy nodes that may have constraints in symbol rate or the number of carriers they can support. The receiver can determine the correct symbol rate and number of carriers through a priori knowledge, a first exchange of packets in a base mode that all nodes can understand, or an indication in the header of the data packet which is transmitted in a base mode of operation that all nodes can understand.
REFERENCES:
patent: 5261118 (1993-11-01), Vanderspool, II et al.
patent: 5268933 (1993-12-01), Averbuch
patent: 5291289 (1994-03-01), Hulyalkar et al.
patent: 5499236 (1996-03-01), Giallorenzi et al.
patent: 5506867 (1996-04-01), Kotzin et al.
patent: 5561701 (1996-10-01), Ichikawa
patent: 5680388 (1997-10-01), Kahre
patent: 5802044 (1998-09-01), Baum et al.
patent: 5870427 (1999-02-01), Tiedemann, Jr. et al.
patent: 5920557 (1999-07-01), Hirata
patent: 6044067 (2000-03-01), Suzuki
patent: 6084917 (2000-07-01), Kao et al.
patent: 6141353 (2000-10-01), Li
patent: 6175550 (2001-01-01), van Nee
patent: 6275518 (2001-08-01), Takahashi et al.
patent: 6452907 (2002-09-01), Levin
patent: 6726297 (2004-04-01), Uesugi
patent: 0 869 647 (1998-10-01), None
patent: 0 905 948 (1999-03-01), None
patent: 2 277 232 (1994-10-01), None
patent: 98/57472 (1998-12-01), None
patent: WO 94/49587 (1999-09-01), None
patent: 00/39977 (2000-07-01), None
Meyr, et al.,Digital Communication Receivers, Chapter 5: “Synthesis of Synchronization Algorithms” (John Wiley and Sons, 1998, New York).
Meyr et al.,Digital Communication Receivers, Chapter 10: “DSP System Implementation” (John Wiley and Sons, 1998, New York).
Mueller et al., “Timing recovery in digital synchronous data receivers” (IEEE Trans. Communications, vol. COM-24, pp. 516-531, May 1976).
Sklar,Digital Communications: Fundamentals and Applications, Chapter 8: “Synchronization in the Context of Digital Communications” (Prentice Hall, 1988, New Jersey).
Verdu,Multiuser Detection, Chapter 6: “Nondecorrelating Linear Multiuser Detection” (Cambridge University Press, 1998).
Verdu,Multiuser Detection, Chapter 7 “Decision-Driven Dectors” (Cambridge University Press, 1998).
Honig et al., “Blind Adaptive Multiuser Detection” (IEEE Trans. on Information Theory, pp. 944-961, vol. 41, No. 4, Jul. 1995).
Le Floch et al., “Coded Orthogonal Frequency Division Multiplex” (IEEE Proceedings, pp. 982-996, vol. 83, No. 6, Jun. 1995).
Atheros Communications Inc.
Bever Hoffman & Harms LLP
Harms Jeanette S.
Odom Curtis
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