Pulse or digital communications – Repeaters – Testing
Patent
1982-03-29
1984-10-23
Bookbinder, Marc E.
Pulse or digital communications
Repeaters
Testing
375 22, 375 43, 375 77, 455 27, 455 33, 455 47, 455 56, 455 63, 455203, H04K 100
Patent
active
044792263
ABSTRACT:
The present invention relates to a frequency-hopped single sideband (SSB) mobile radio system implemented by hopping the carrier frequency of an input signal (s(t)) every .tau. seconds. The hopping is controlled by a carrier-frequency-hopped sequence (f.sub.i (t)) generated by a carrier-frequency-hopping generator (16,24). When employed in a frequency-hopped SSB transmitter (10), the carrier sequence functions to modulate the input signal, "hopping" it to a different carrier frequency every .tau. seconds. The carrier-frequency-hopped SSB receiver (20) employs the identical carrier sequence as used by the transmitter to demodulate the transmitted carrier-frequency-hopped SSB signal, thereby recovering the original single sideband signal (s(t)). By frequency hopping the carrier signal of an SSB signal, the present invention mitigates the effects of co-channel interference and frequency selective fading inherent in prior art SSB cellular mobile radio systems.
REFERENCES:
patent: 4019140 (1977-04-01), Swerdlow
patent: 4066964 (1978-01-01), Costanza et al.
patent: 4176316 (1979-11-01), De Rosa et al.
patent: 4184117 (1980-01-01), Lindner
patent: 4193030 (1980-03-01), Rabow et al.
patent: 4276652 (1981-06-01), McCalmont et al.
"A Spread Spectrum Technique for High Capacity Mobile Communications"-G. Cooper et al., Conference Record, 27th Annual Conference IEEE Vehicular Technology Group, Mar. 16-18, 1977, pp. 98-103.
"Single Sideband Transmission for Land Mobile Radio"-B. Lusignan, IEEE Spectrum, Jul. 1978, pp. 33-37.
"The Effects of Mobile Radio Channel Bandwidth Reduction on Spectrum Usage"-W. Pannell, Conference Record, 29th Annual Conference IEEE Vehicular Technology Group, Mar. 27-30, 1979, pp. 95-104.
"The Effect of Fading and Shadowing on Channel Reuse in Mobile Radio"-R. French, IEEE Trans. on Vehicular Technology, vol. VT-28, No. 3, Aug. 1979, pp. 171-181.
"Single Sideband Modulation, A Feasible Technique to Gain Transmission Capacity In Terrestrial Radio Relay Links"-W. Oei et al., Int'l. Conf. on Radio Spectrum Conservation Techniques, Jul. 7-9, 1980, pp. 163-167.
"Performance of a Frequency-Hopped Differentially Modulated Spread Spectrum Receiver in a Rayleigh Fading Channel"-R. Nettleton et al., IEEE Trans. on Vehicular Technology, vol. VT-30, No. 1, Feb. 1981, pp. 14-29.
Prabhu Vasant K.
Steele Raymond
AT&T Bell Laboratories
Bookbinder Marc E.
Koba Wendy W.
Pfeifle Erwin W.
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