Wireless frequency-division-multiple-access direct sequence spre

Details Wireless frequency-division-multiple-access direct sequence spre Wireless frequency-division-multiple-access direct sequence spre

1994-03-17

1996-04-23

Cain, David C.

Pulse or digital communications

Repeaters

Testing

375206, 375207, 380 34, 379 61, 379 62, 455 89, H04B 1500

Patent

active

055110908

ABSTRACT:
A cordless, battery-operated telephone of relatively low power consumption suitable to operate in license-exempt spectrum and which may employ an established communication protocol, such as the CT-2 communication protocol, is realized by providing a direct sequence spread spectrum (DSSS) modulator/spreader and demodulator/despreader in a battery-operated handset in connection with an intelligent CT-2 controller to which is added additional circuitry and functionality in the handset for acquiring, pulling-in and tracking, in both operational and low-power-consumption standby modes, a received DSSS signal from a base station unit. The additional functionality in the handset includes a PN phase discriminator with intelligent oversampling to deal with the time division duplex signals during synchronization, a second order delay lock loop for in-service mode tracking at a moderate loop iteration rate, and an extended-range discriminator and very narrow-band third-order delay lock loop for stand-by mode tracking at a very low loop iteration rate.

REFERENCES:
patent: 5258995 (1993-11-01), Su et al.
patent: 5335249 (1994-08-01), Krueger et al.
patent: 5343494 (1994-08-01), Averst et al.
patent: 5363404 (1994-11-01), Kotzin et al.
patent: 5375140 (1994-12-01), Bustamante et al.
CT2Plus Class 2: Specification for the Canadian Common Air Interface for Digital Cordless Telephony, Including Public Services, RSS-130 Annex 1, Issue 2, Radio Standards Specification, Effective Jan. 23, 1993.
CT2 PhoX.TM. Controller for Digital Cordless Telephones Am79C410, Advanced Micro Devices, pp. 1-40, Feb. 1993.

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