Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1996-11-15
2000-10-31
Pham, Chi H.
Pulse or digital communications
Spread spectrum
Direct sequence
375152, 375142, 375143, A61F 206, H04L 2730
Patent
active
061413739
ABSTRACT:
In a first embodiment of the invention, a concatenated preamble code is formed by a kronecker product between two subcodes of the same or different lengths. The subcodes have favorable correlation properties and may be Barker codes, minimum peak sidelobe codes, Gold codes, Kasami codes, Boztas codes, or other codes. At the receiver a two-stage processor is used to detect the concatenated preamble code. The two-stage processor comprises a series of two filters, one of which is preferably a mismatched filter. In another aspect of the invention, a repeated codeword preamble is formed from a series of the same repeated short subcode. The short subcode may be an augmented or truncated odd-length code. At the receiver a single matched filter is preferably used to generate a series of spikes separated by the period of the subcode. An alert/confirm detector non-coherently adds together individual correlation spikes and reject false alarms. The alert function measures total correlation energy and adjusts detection thresholds based thereon, while the confirm function ensures that the proper number of correlation spikes exceed a detection threshold at the correct times. The preamble codes and their means for detection are preferably employed in a TDMA spread spectrum communication system, wherein a plurality of user stations communicate with a base station, one in each time slot (or virtual time slot).
REFERENCES:
patent: 3569631 (1971-03-01), Holmdel
patent: 3723916 (1973-03-01), Speiser et al.
patent: 3934203 (1976-01-01), Schiff
patent: 4100498 (1978-07-01), Alsup et al.
patent: 4164628 (1979-08-01), Ward et al.
patent: 4189677 (1980-02-01), Cooper et al.
patent: 4222115 (1980-09-01), Cooper et al.
patent: 4231005 (1980-10-01), Taylor, Jr.
patent: 4324001 (1982-04-01), Rhodes
patent: 4338579 (1982-07-01), Rhodes
patent: 4418393 (1983-11-01), Zachiele, Jr.
patent: 4418425 (1983-11-01), Fennel, Jr. et al.
patent: 4423519 (1983-12-01), Bennett, Jr. et al.
patent: 4432089 (1984-02-01), Wurzburg et al.
patent: 4484028 (1984-11-01), Kelley et al.
patent: 4506372 (1985-03-01), Massey
patent: 4525835 (1985-07-01), Vance et al.
patent: 4527275 (1985-07-01), Russell
patent: 4532639 (1985-07-01), Price et al.
patent: 4538281 (1985-08-01), Rajan
patent: 4550414 (1985-10-01), Guinon et al.
patent: 4561089 (1985-12-01), Rouse et al.
patent: 4563774 (1986-01-01), Gloge et al.
patent: 4567588 (1986-01-01), Jerrim
patent: 4583048 (1986-04-01), Gumacos et al.
patent: 4587662 (1986-05-01), Langewellpott
patent: 4599732 (1986-07-01), Lefever
patent: 4601047 (1986-07-01), Horwitz et al.
patent: 4606039 (1986-08-01), Nicolas et al.
patent: 4621365 (1986-11-01), Chiu
patent: 4630283 (1986-12-01), Schiff
patent: 4638494 (1987-01-01), Kartchner et al.
patent: 4653069 (1987-03-01), Roeder
patent: 4660164 (1987-04-01), Leibowitz
patent: 4688210 (1987-08-01), Eizenhofer et al.
patent: 4691326 (1987-09-01), Yauchiya
patent: 4724435 (1988-02-01), Moses et al.
patent: 4736371 (1988-04-01), Tejima et al.
patent: 4742512 (1988-05-01), Akashi et al.
patent: 4745408 (1988-05-01), Nagata et al.
patent: 4745628 (1988-05-01), McDavid et al.
patent: 4759034 (1988-07-01), Nagazumi
patent: 4765753 (1988-08-01), Schmidt
patent: 4774715 (1988-09-01), Messenger
patent: 4787093 (1988-11-01), Rorden
patent: 4797947 (1989-01-01), Labedz
patent: 4817014 (1989-03-01), Schneider
patent: 4837786 (1989-06-01), Gurantz et al.
patent: 4860307 (1989-08-01), Nakayama
patent: 4894842 (1990-01-01), Brockhoven et al.
patent: 4928274 (1990-05-01), Gilhousen et al.
patent: 4965759 (1990-10-01), Uchida et al.
patent: 4995083 (1991-02-01), Baker
patent: 5014344 (1991-05-01), Golberg
patent: 5016255 (1991-05-01), Dixon et al.
patent: 5022046 (1991-06-01), Morrow
patent: 5022047 (1991-06-01), Dixon et al.
patent: 5023887 (1991-06-01), Takeuchi et al.
patent: 5029184 (1991-07-01), Andren et al.
patent: 5097484 (1992-03-01), Akaiwa
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5132986 (1992-07-01), Endo et al.
patent: 5146471 (1992-09-01), Cowart
patent: 5151698 (1992-09-01), Pophillat
patent: 5153598 (1992-10-01), Alves, Jr.
patent: 5166952 (1992-11-01), Omura et al.
patent: 5181225 (1993-01-01), Neeser et al.
patent: 5206882 (1993-04-01), Schloemer
patent: 5210770 (1993-05-01), Rice
patent: 5228056 (1993-07-01), Schilling
patent: 5239572 (1993-08-01), Saegusa et al.
patent: 5257283 (1993-10-01), Gilhousen et al.
patent: 5276704 (1994-01-01), Dixon
patent: 5276705 (1994-01-01), Higgins
patent: 5280472 (1994-01-01), Gilhousen et al.
patent: 5280537 (1994-01-01), Sugiyama et al.
patent: 5291515 (1994-03-01), Uchida et al.
patent: 5313457 (1994-05-01), Hostetter et al.
patent: 5347284 (1994-09-01), Volpi et al.
patent: 5353303 (1994-10-01), Walthall
patent: 5353389 (1994-10-01), O'Clock et al.
patent: 5359625 (1994-10-01), Vander Mey et al.
patent: 5367544 (1994-11-01), Bruekheimer
patent: 5377192 (1994-12-01), Goodings et al.
patent: 5383219 (1995-01-01), Wheatley, III et al.
patent: 5392287 (1995-02-01), Tiedemann, Jr. et al.
patent: 5400359 (1995-03-01), Hikoso et al.
patent: 5410568 (1995-04-01), Schilling
patent: 5414428 (1995-05-01), Gallagher et al.
patent: 5414728 (1995-05-01), Zehavi
patent: 5414796 (1995-05-01), Jacobs et al.
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5436941 (1995-07-01), Dixon et al.
patent: 5442662 (1995-08-01), Fukasawa et al.
patent: 5469469 (1995-11-01), Haines
patent: 5481533 (1996-01-01), Honig et al.
patent: 5504781 (1996-04-01), Wolf
patent: 5511067 (1996-04-01), Miller
patent: 5535402 (1996-07-01), Leibowitz
patent: 5602832 (1997-02-01), Hudson
patent: 5610940 (1997-03-01), Durrant et al.
patent: 5619270 (1997-04-01), Demmer
patent: 5786788 (1998-07-01), Schober et al.
patent: 5805584 (1998-09-01), Kingston
Simon, Marvin K. et al., Spread Spectrum Communications Handbook, pp. 7-9, 262-266, 269-270, 297-299, 352-353 (1994).
CDSIM--a simulation environment for spreading codes, Karkkainen, Vehicular Technology Conference, Jun. 8, 1994.
W.H. Wow, Best Quadriphasse Codes Up to Length 24, Electronics Letters, vol. 29, No. 10 (Date of Publication: May 13, 1993).
Kim et al., Optimal PN codes in a DS/SS wireless LAN system, IEEE, p. 226 (Date of Publication: Aug. 1994).
Grayson, et al., Optimum Synchronization Preamble, Electronics Letters, vol. 27, No. 1, pp. 36-38 (Date of Publication: Jan. 1991).
Blinchikoff, Range Sidelobe Reduction for Quadriphase Codes, IEEE, pp. 668-675 (Date of Publication Apr. 1996).
Ruprecht, Jurg, "Code Time Division Multiple Access: A Method for the Orthogonalization of CDMA Signals in Multipath Environment", Aachener Kolloquium "Signal theorie", Mobile Kommunikation Systems, Mar. 1994, pp. 1-8.
Feher, Kamilo, JTC Modulation Standard Group--FQPSK Consortium--Spectrum utilization with compatible/expandable GMSK, QPSK and FQPSK, JTC: Joint Technical Committee On Wireless Access, Jan. 1994.
Anderson, John B. et al., Digital Phase Modulation, (Plenum Press, 1986), Chap. 7, pp. 237-271.
Bird, John S., "Calculating the Performance of Linear and Square-Law Detectors", IEEE Trans. On Aerospace & Elec. Sys., 31(1):39-51, Jan. 1995.
Boztas, Serdar et al., "4-Phase Sequences with Near-Optimum Correlation Properties", IEEE Trans. On Info. Theory, 38(3):1101-1113, May 1992.
Campbell, Colin K., "Applications of Surface Acoustice and Shallow Bulk Acoustic Wave Devices", Proc. of the IEEE, Oct. 1989, pp. 1453-1484.
Cohen, Marvin N., "Pulse Compression in Pulsed Doppler Radar Systems," reprinted in Morris, Guy V., Airbourne Pulsed Doppler Radar, Chap. 8, pp. 123-155, 1988.
Cohen, Marvin N. et al., "Minimum Peak Sidelobe Pulse Compression Codes", IEEE Int'l Radar Conf., 1990, pp. 633-638.
Collins, J.H. et al., "The Role of Surface Acoustic Wave Technology in Communication Systems", Ultrasonics, 10(2):59-71, Mar. 1972.
de Jager, Frank et al., "Tamed Frequency Modulation, A Novel Method to Achieve Spectrum in Digital Transmission", IEEE Trans. on Comms., Com-26(5):534-541, May 1978.
Dixon, Robert C., Spread Spectrum Systems with Commercial Applica
Corrielus Jean B
Omnipoint Corporation
Pham Chi H.
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