Subscriber unit for wireless digital telephone system
First Claim
1. In a subscriber unit for a wireless digital telephone systema baseband processor for receiving an input signal from an input source, said input signal constituting a digitized bit stream wherein each given number of successive bits defines a symbol, transcoding said input signal in accordance with a predetermined code and acting as a function control means for said unit;
- storage means coupled to said baseband processor for storing information associated with functions controlled by said baseband processor and information supplied thereto;
control means coupled to said baseband processor in a manner permitting said control means to access said baseband processor and to obtain information stored in said storage means and available to said baseband processor;
said control means being coupled to a programming means for programming said control means to perform its various control functions as well as to an interpolator means for increasing the sampling rate of the transcoded signal, and a frequency translator means for performing time multiplexed quadrature mixing of the output of said interpolator means with the output of a timing generator whereby the entire frequency spectrum of the output from said interpolator means is translated to a second frequency spectrum to provide a time multiplexed digital signal;
a digital to analog converter for receiving the time multiplexed digital signal from said frequency translator means and converting it into an analog signal;
deglitching means for removing glitch energy from said analog signal; and
means for converting said deglitched analog signal to an amplified IF signal.
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Accused Products
Abstract
A digital wireless subscriber telephone unit for wireless connection with a base station. The subscriber unit has baseband processor which is coupled to storage means for the baseband functions. The baseband 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 a looped-back signal to produce correction constants to compensate for undersirable variations in the IF, these constants being stored for use in correcting actual received signals.
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Citations
10 Claims
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1. In a subscriber unit for a wireless digital telephone system
a baseband processor for receiving an input signal from an input source, said input signal constituting a digitized bit stream wherein each given number of successive bits defines a symbol, transcoding said input signal in accordance with a predetermined code and acting as a function control means for said unit; -
storage means coupled to said baseband processor for storing information associated with functions controlled by said baseband processor and information supplied thereto; control means coupled to said baseband processor in a manner permitting said control means to access said baseband processor and to obtain information stored in said storage means and available to said baseband processor; said control means being coupled to a programming means for programming said control means to perform its various control functions as well as to an interpolator means for increasing the sampling rate of the transcoded signal, and a frequency translator means for performing time multiplexed quadrature mixing of the output of said interpolator means with the output of a timing generator whereby the entire frequency spectrum of the output from said interpolator means is translated to a second frequency spectrum to provide a time multiplexed digital signal; a digital to analog converter for receiving the time multiplexed digital signal from said frequency translator means and converting it into an analog signal; deglitching means for removing glitch energy from said analog signal; and means for converting said deglitched analog signal to an amplified IF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification