Subscriber unit for wireless digital telephone system

Details Subscriber unit for wireless digital telephone system Subscriber unit for wireless digital telephone system

H - Electricity

04

M

379/11

H04M 1/00 (2006.01) H03D 3/00 (2006.01) H03D 7/16 (2006.01) H03H 17/06 (2006.01) H03L 7/095 (2006.01) H04B 1/50 (2006.01) H04L 27/152 (2006.01) H04L 27/233 (2006.01) H04M 1/725 (2006.01)

Patent

CA 1263900

ABSTRACT OF THE DISCLOSURE A digital wireless subscriber telephone unit for wireless connection with a base station. The sub- scriber unit has a baseband processor which is coupled to storage means for the baseband functions. The base- band processor is direct access coupled to a modem processor whereby the two processors may communicate with each other. The modem processor generally acts as the master in the system, although lock-out means may be used in certain circumstances. The signal from the modem processor is converted to an analog signal, which is subjected to deglitching, and the deglitched signal is then upconverted and filtered to form an IF signal which is thereafter amplified. The amplified IF signal is combined with a signal generated by a synthesizer to provide an RF signal, On the basis of certain signals received from the base station, the baseband processor produces initiating signals which determine whether the subscriber unit will be in the transmit mode or the receive mode. In intervals between actuation of the system, a training mode is used wherein a known signal from the modem processor is compared with looped-back signal to produce correction constants to compensate for undesirable variations in the IF, these constants being stored for use in correcting actual received signals. During demodulation, the modulated digital signals are fed to the modem processor in the form of time multi- plexed I and Q samples and are demultiplexed. The demultiplexed I and Q samples are fed to an equalizer and frequency correction circuit for minimization of errors and for production of a frequency correction signal which is used to correct any errors in the timing of the system and in the output of the synthesizer.

534177

Affiliated with

Also associated with

Rating

Subscriber unit for wireless digital telephone system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Subscriber unit for wireless digital telephone system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Subscriber unit for wireless digital telephone system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1190316