Pulse or digital communications – Repeaters – Testing
Patent
1992-07-21
1993-08-10
Swann, Tod R.
Pulse or digital communications
Repeaters
Testing
380 34, 370 18, 379 59, 455 331, H04K 100
Patent
active
052356159
ABSTRACT:
A method for establishing and communicating synchronous, code division multiple access communications between a base station and a plurality of remote units. A plurality of remote-communications signals which have spread-spectrum modulation are transmitted from the plurality of remote units and arrive simultaneously at the base station. The method includes transmitting repetitively from the base station a access signal having spread-spectrum modulation and receiving the access signal at an accessing-remote unit. The accessing-remote unit transmits an echo signal which has spread-spectrum modulation. The echo signal is received at the base station and a time delay is measured between the access signal and the received echo signal. A protocol signal which has spread-spectrum modulation is transmitted to the accessing-remote unit, with the protocol signal communicating a chip codeword and the time delay measured at the base station. The accessing-remote unit adjusts a delay time such that the communications signal transmitted from the accessing-remote unit arrives simultaneously at the base station with communications signals transmitted from the plurality of remote units. The base station communicates to the plurality of remote units, with a plurality of base-communications signals. Each chip codeword of each base-communications signal is orthogonal to chip codewords of the plurality of base-communications signals.
The plurality of remote-communications signals arrive simultaneously at the base station with each chip codeword of each remote-communications signal orthogonal to chip codewords of the plurality of remote-communications signals.
REFERENCES:
patent: 3831013 (1974-08-01), Alsup et al.
patent: 3900721 (1975-08-01), Speiser et al.
patent: 4112372 (1978-09-01), Holmes et al.
patent: 4222115 (1980-09-01), Cooper et al.
patent: 4238850 (1980-12-01), Vance
patent: 4247942 (1981-01-01), Hauer
patent: 4392232 (1983-07-01), Andren et al.
patent: 4418393 (1983-11-01), Zscheile, Jr.
patent: 4418425 (1983-11-01), Fennel, Jr. et al.
patent: 4425642 (1984-01-01), Moses et al.
patent: 4455651 (1984-06-01), Baran
patent: 4471164 (1984-09-01), Henry
patent: 4479226 (1984-10-01), Prabhu et al.
patent: 4512013 (1985-04-01), Nash
patent: 4523311 (1985-06-01), Lee et al.
patent: 4553130 (1985-11-01), Kato
patent: 4563774 (1986-01-01), Gloge
patent: 4570265 (1986-02-01), Thro
patent: 4606039 (1986-08-01), Nicolas et al.
patent: 4612415 (1986-09-01), Zdunek et al.
patent: 4612637 (1986-09-01), Davis et al.
patent: 4617674 (1986-10-01), Mangulis et al.
patent: 4621365 (1986-11-01), Chiu
patent: 4647863 (1987-03-01), Skudera, Jr. et al.
patent: 4649549 (1987-03-01), Halpern et al.
patent: 4653069 (1987-03-01), Roeder
patent: 4660164 (1987-04-01), Leibowitz
patent: 4672605 (1987-06-01), Hustig et al.
patent: 4672629 (1987-06-01), Beier
patent: 4672658 (1987-06-01), Kavehrad et al.
patent: 4675839 (1987-06-01), Kerr
patent: 4680785 (1987-07-01), Akiyama et al.
patent: 4691326 (1987-09-01), Tsuchiya
patent: 4697260 (1987-09-01), Grauel et al.
patent: 4703474 (1987-10-01), Foschini et al.
patent: 4707839 (1987-11-01), Andren et al.
patent: 4718080 (1988-01-01), Serrano et al.
patent: 4730340 (1988-03-01), Frazier, Jr.
patent: 4742512 (1988-05-01), Akashi et al.
patent: 4757495 (1988-07-01), Decker et al.
patent: 4759034 (1988-07-01), Nagazumi
patent: 4789983 (1988-12-01), Acampora et al.
patent: 4799253 (1989-01-01), Stern et al.
patent: 4805208 (1989-02-01), Schwartz
patent: 4807222 (1989-02-01), Amitay
patent: 4837802 (1989-06-01), Higashiyama et al.
patent: 4843350 (1989-06-01), Nazarathy et al.
patent: 4843586 (1989-06-01), Nazarathy et al.
patent: 4850036 (1989-07-01), Smith
patent: 4860307 (1989-08-01), Nakayama
patent: 4866732 (1989-09-01), Carey et al.
patent: 4894842 (1990-01-01), Broekhoven et al.
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 4914651 (1990-04-01), Lusignan
patent: 4922506 (1990-05-01), McCallister et al.
patent: 4930140 (1990-05-01), Cripps et al.
patent: 4932037 (1990-06-01), Simpson et al.
patent: 4969159 (1990-11-01), Belcher et al.
patent: 4977577 (1990-12-01), Arthur et al.
patent: 4977578 (1990-12-01), Ishigaki et al.
patent: 5005169 (1991-04-01), Bronder et al.
patent: 5016255 (1991-05-01), Dixon et al.
patent: 5016256 (1991-05-01), Stewart
patent: 5022047 (1991-06-01), Dixon et al.
patent: 5023887 (1991-06-01), Takeuchi et al.
patent: 5029181 (1991-07-01), Endo et al.
patent: 5040238 (1991-08-01), Comroe et al.
patent: 5048052 (1991-09-01), Hamatsu et al.
patent: 5056109 (1991-10-01), Gilhousen et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
M. K. Simon, J. K. Omura, R. A. Scholtz, & B. K. Levitt, Spread Spectrum Communications, vol. 1, pp. 1-39, Rockville, Md.: Computer Science Press, 1985.
M. K. Simon, J. K. Omura, R. A. Scholtz & R. K. Levitt Spread Spectrum Communications, vol. 3, pp. 346-407, Rockville, Md.: Computer Science Press, 1985.
R. A. Scholtz, "The Origins of Spread-Spectrum Communications", IEEE Trans. Commun. COM-30, No. 5, pp. 822-854, May 1982.
R. L. Pickholtz, D. L. Schilling & L. B. Milstein "Theory of Spread-Spectrum Communications-A Tutorial", IEEE Trans Commun., COM-30, No. 5, pp. 855-884, May 1982.
R. A. Scholtz, "Notes on Spread-Spectrum History", IEEE Trans. Commun. COM-31, No. 1, pp. 82-84, Jan. 1983.
R. Price, "Further Notes and Anecdotes on Spread-Spectrum Origins", IEEE Trans. Commun., COM-31, No. 1, pp. 85-97, Jan. 1983.
M. Kavehrad, "Performance of Nondiversity Receivers for Spread Spectrum in Indoor Wireless Communications", AT&T Technical J., vol. 64, No. 6, pp. 1181-1210, Jul.-Aug. 1985.
M. Kauehrad & P. J. McLane, "Spread Spectrum for Indoor Digital Radio", IEEE Commun. Mag. vol. 25, No. 6, pp. 32-40 Jun. 1987.
M. Kavehrad & G. E. Bodeep, "Design and Experimental Results for a Direct-Sequence Spread-Spectrum Radio Using Differential Phase-Shift Keying Modulation for Indoor, Wireless Communications", IEEE Trans. Commun., SAC-5, No. 5, pp. 815-823, Jun. 1987.
Cylink Corporation
Swann Tod R.
LandOfFree
Spread spectrum method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spread spectrum method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread spectrum method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1731704