Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2003-12-08
2008-11-25
Jain, Raj K (Department: 2616)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S322000, C370S342000, C370S343000, C370S341000, C370S395410, C370S436000, C370S437000, C370S468000, C370S477000, C455S450000, C455S445000, C455S436000
Reexamination Certificate
active
07457295
ABSTRACT:
A spectral reuse transceiver-based communication system conducts communications between a master site and a plurality of remote sites using a selected portion of a communication bandwidth containing a plurality of sub-bandwidth channels. Each remote site transceiver monitors the communication bandwidth for activity on the sub-bandwidth channels, and informs a master site transceiver which sub-bandwidth communication channels are absent communication activity and therefore constitute clear channels. The master site transceiver compiles an aggregate list of clear channels from all the remote sites and then broadcasts the aggregate list to the remote sites. The master site and a remote site then conduct communications therebetween by frequency-hopping and/or orthogonal frequency multiplexing among the clear channels using an a priori known PN sequence.
REFERENCES:
patent: 4578815 (1986-03-01), Persinotti
patent: 5040238 (1991-08-01), Comroe et al.
patent: 5475677 (1995-12-01), Arnold et al.
patent: 5475866 (1995-12-01), Ruthenberg
patent: 5640442 (1997-06-01), Fitzgerald et al.
patent: 5901357 (1999-05-01), D'Avello et al.
patent: 5999818 (1999-12-01), Gilbert et al.
patent: 6301481 (2001-10-01), Parra
patent: 6304756 (2001-10-01), Hebeler et al.
patent: 6324184 (2001-11-01), Hou et al.
patent: 6801775 (2004-10-01), Gibbons et al.
patent: 2002/0002052 (2002-01-01), McHenry
patent: 2002/0085503 (2002-07-01), Hulyalkar et al.
patent: 2003/0050012 (2003-03-01), Black et al.
patent: 2003/0181213 (2003-09-01), Sugar et al.
patent: 2003/0198200 (2003-10-01), Diener et al.
patent: 2004/0047324 (2004-03-01), Diener
patent: 2004/0077366 (2004-04-01), Panasik et al.
Cherubini, Giovanni,Filtered Multitone Modulation for Very High-Speed Digital Subscriber Lines, IEEE, vol. 20, No. 5, Jun. 2002, pp. 1016-1028.
Vangelista, Lorenzo,Efficient Implementations and Alternative Architectures for OFDM-OQAM Systems, IEEE members, pp. 1-15.
Dick, Chris,Implementation of FPGA Signal Processing Datapaths for Software Defined Radios, Communications Design China, Conference Proceedings, pp. 241-247.
Andraka, Ray,A Survey of CORDIC Algorithms for FPGA Based Computers, Andrake Consulting Group, 10 pages.
Moonen, Marc,Per Tone Equalization for DMT Receivers, Globecom, Rio de Janeiro, Brazil, Dec. 1999, 6 pages.
Wang, Kai,Time and Frequency Synchronisation in OFDM, School of Communications and Informatics, Victoria University, Melbourne, Australia, 2 pages.
Zhou, Shengli,Finite-Alphabet Based Channel Estimation for OFDM and Related Multicarrier Systems, IEEE, vol. 49, No. 8, Aug. 2001, pp. 1402-1414.
Lee, Donghoon,A New Symbol Timing Recovery Algorithm for OFDM Systems, IEEE, 1997, pp. 366-367.
van de Beek, Jan-Jaap,ML Estimation of Time and Frequency Offset in OFDM Systems, IEEE, vol. 45, No. 7, Jul. 1997, pp. 1800-1805.
Wyglinski, Alexander M.,Adaptive Filterbank Multicarrier Wireless Systems for Indoor Environments, Proc. 56thIEEE Vehicular Tech Conf. (Vancouver, BC), Sep. 2002, pp. 336-340.
Saulnier, Gary J.,Performance Of An OFDM Spread Spectrum Communications System Using Lapped Transforms, IEEE, 1997, 5 pages.
Vaidyanathan, P. P.,Filter Banks in Digital Communications, Dept. of Electrical Engineering, California Institute of Technology, Pasadena, CA, 23 pages.
Ohm, Michael,Extended Lapped Transforms for Digital Multicarrier Modulation, Globecom, IEEE 25-29, Nov. 2001, pp. 217-221.
Saulnier, Gary J.Performance of a Spread Spectrum OFDM System in a Dispersive Fading Channel with Interference, IEEE, 1998, 5 pages.
Weiss, Stephan,Fast Implementation of Oversampled Modulated Filter Banks, Dept. of Electronics, University of Southhampton, 4 pages.
Weiss, Stephan,Analysis and Fast Implementation of Oversampled Modulated Filter Banks, Dept. of Electronics, University of Southhampton, 12 pages.
Eneman, Koen,Para-Unitary Filter Bank Design for Oversampled Subband Systems, Dec. 1997, rev. Jul. 1998, 31 pages.
Govardhanagiri, Subbarao,Performance Analysis of Multicarrier Modulation Systems Using Cosine Modulated Filter Banks, IEEE, 1999, pp. 1405-1408.
Filtered Multitone Modulation, IBM Europe, 14 pages.
Schuller, Gerald,Modulated Filter Bank with Arbitrary System Delay: Efficient Implementations and the Time-Varying Case, IEEE, vol. 48, No. 3, Mar. 2000, pp. 737-748.
Karp, Tanja,Modified DFT Filter Banks with Perfect Reconstruction, IEEE, vol. 46, No. 11, Nov. 1999, pp. 1404-1414.
Heller, Peter,A General Formulation of Modulated Filter Banks, IEEE, vol. 47, No. 4, Apr. 1999, pp. 986-1002.
Harteneck, Moritz,Design of Near Perfect Reconstruction Oversampled Filter Banks for Subband Adaptive Filters, IEEE, vol. 46, No. 8, Aug. 1999, pp. 1081-1085.
Treichler, J. R.,Practical Implementations of Blind Demodulators, Applied Signal Technology, Inc. 5 pages.
Knapp, Steven,Using Programmable Logic to Accelerate DSP Functions, Xilinx, Inc. 1995, pp. 1-8.
Andraka, Ray,High Performance Digital Down-Converters for FPGAs, pp. 48-51.
Doan Vo, Nguyen,Optimal Interpolators for Flexible Digital Receivers, McGraw University, 4 pages.
Dick, Chris,FPGA Interpolators Using Polynomial Filters, 8thInternational Conference, Sep. 13-16, 1998, 5 pages.
Barbarossa, Sergio,Channel-Independent Synchronization of Orthogonal Frequency Division Multiple Access Systems, IEEE, vol. 20, No. 2, Feb. 2002, pp. 474-486.
Speth, Michael,Frame Synchronization of OFDM Systems in Frequency Selective Fading Channels, 5 pages.
Müller, Stefan,Comparison of Preamble Structures for Burst Frequency Synchronization, Globecom, San Francisco, CA, Nov. 2000, pp. 1488-1493.
DesBrisay, Greg,Basics of Orthogonal Frequency Division Multiplexing (OFDM), Cisco Systems, Inc., 2000, pp. 1-42.
Zhou, Shengli,Digital Multi-Carrier Spread Spectrum Versus Direct Sequence Spread Spectrum for Resistance to Jamming and Multipath, IEEE, vol. 50, No. 4, Apr. 2002, pp. 643-655.
Lambrette, Uwe,Techniques for Frame Synchronization on Unknown Frequency Selective Channels, 5 pages.
Classen, Ferdinand,Frequency Synchronization Algorithms for OFDM Systems Suitable for Communication Over Frequency Selective Fading Channels, IEEE, 1994, pp. 1655-1659.
Keller, Thomas,Orthogonal Frequency Division Multiplex Synchronization Techniques for Frequency-Selective Fading Channels, IEEE, vol. 19, No. 6, Jun. 2001, pp. 999-1008.
Gardner, Floyd,A BPSK/QPSK Timing-Error Detector for Sampled Receivers, IEEE, vol. COM-34, No. 5, May 1986, pp. 423-429.
Johansson, Stefan,Silicon Realization of an OFDM Synchronization Algorithm, Department of Applied Electronics, Sweden, 4 pages.
van de Beek, Jan-Jaap,Low Complex Frame Synchronization in OFDM Systems, IEEE 1995, pp. 982-986.
Schafhuber, Dieter,Pulse-Shaping OFDM/BFDM Systems For Time-Varying Channels: ISI/ICI Analysis, Optimal Pulse Design, and Efficient Implementation, Vienna University of Technology, 5 pages.
Pfletschinger, Stephan,Optimized Impulses for Multicarrier Offset-QAM, Globecom, IEEE 25-29, Nov. 2001, vol. 1, p. 207-211.
Landström, Daniel,Time and Frequency Offset in OFDM Systems Employing Pulse Shaping, IEEE, 1997, pp. 278-283.
Vahlin, Anders,Optimal Finite Duration Pulses for OFDM, IEEE, vol. 44, No. 1, Jan. 1996, pp. 10-14.
van de Beek, Jan-Jaap,Synchronization of a TDMA-OFDM Frequency Hopping System, IEEE 1998, 6 pages.
Zyren, Jim,Tutorial on Basic Link Budget Analysis, Intersil, Jun. 1998, pp. 1-8.
Gardner, Floyd M.Interpolation in Digital Modems—Part I: Fundamentals, IEEE, vol. 41, No. 3, Mar. 1993, pp. 501-507.
Erup, Lars,Interpolation in Digital Modems—Part II: Implementation and Performance, IEEE, vol. 41, No. 6, Jun. 1993, pp. 998-1008.
Moonen, Marc,Digital Signal Processing II—Lecture 7: Maximally Decimated Filter Banks Oversampled Filter Banks, pp. 1-40.
Li, Jian,Carrier Frequency Offset Estimation for OFDM-Based WLANs, IEEE, vol. 8, No. 3, Mar. 2001, pp. 80-82.
Larsson, Erik G.,Joint Symbol Timing and Channel Estimation for OFDM Based WLANs, IEEE, vol. 5, No. 8, Aug. 2001, pp. 325-327.
Miaoudakis, Andreas,An All-Digital Feed-Forward CFO Cancellation Scheme for Hiperlan/2 in Multipath Environment, IEEE 2002
Gerhardt Edward Carl
Highsmith William R.
Koos Larry W.
Odom David M.
Powell Gregory M.
Adapt4 LLC
Cesarano Michael C.
Feldman Gale PA
Jain Raj K
LandOfFree
Radio communication system employing spectral reuse... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radio communication system employing spectral reuse..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio communication system employing spectral reuse... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4025289