Wireless Access

Tim A Williams

David S Parkinson

Kenneth R Cioffi

Cynthia C Robinson

Russell P Prosynchak

Peter O Okrah

An over-the-air programming (OTAP) technique in which programming messages are sent to a communication device in order to change operational parameters in the communication device. These operational parameters may comprise functional characteristics of the communication device. The programming is secure in that the communication device is only responsive for a predetermined period of time when enabled.

Method and apparatus for over the air programming a communication device

A communication portable radio frequency (RF) communication device such as a pager that receives messages and formats selected messages and stores the formatted messages on a removably attached integrated circuit card (IC) computer card. After receiving and formatting messages, the card may be removed and coupled to a computer system. Then the computer system may access the data on the card.

Communications apparatus and method with a computer interchangeable

A novel direct conversion receiver utilizing a sample and hold circuit for subsampling the input signal. The output of the sample and hold circuit is applied to a sigma-delta loop to provide a high speed low resolution data stream which in turn is applied to a decimator which provides a high precision, low data rate signal having quadrature outputs.

Direct conversion receiver for multiple protocols

An apparatus and method to transmit and receive digital signals in a communication system having a power source that provides power to a portion of a communication device and a mechanism to disable power to that portion of the communication device for periods of time, such that a reduced power consumption state is entered. Also included is sampling hardware to sample the signal during those periods of time when the communication device is not in the reduced power consumption state, which occurs when data is transferred or received.

Method and apparatus for reducing power consumption in digital

Improved integration and simplified construction of direct conversion receivers is achieved by providing selectivity in the early stages of a sigma delta converter to reject adjacent channel signals and thereby allow greater dynamic range for the desired input signals. A bandpass sigma delta converter is taught which is suitable for use with signals having multiple protocols. In a first stage, an aliased input signal is applied to two filters having desired and preferably programmable filter characteristics which provide selectivity to the input signal. A third filter is utilized having a programmable center frequency, which receives as an input signal the sum of the filtered input signal plus the quantization noise of the first stage. This provides a first intermediate output signal of desired selectivity. Quantization noise of the first stage is also applied to a second filter stage which provides a second intermediate output signal having a first component related to the quantization noise of the first stage, and a second component which is the shaped quantization noise of the second stage. The first and second intermediate output signals are combined in order to provide a desired output signal in which the original input signal has been filtered to provide a desired selectivity and converted to a digital signal while the quantization noise of the first stage has been cancelled, and the quantization noise of the second stage has been shaped by a desired function and converted to a digital signal independent of the input signal shaping.

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Danville, CA, United States of America

Tim A Williams