1
Robert V Janc, Steven C Jasper: Digital global positioning system receiver. Motorola, Thomas G Berry, November 15, 1988: US04785463 (404 worldwide citation)

A digital receiver for GPS C/A-code signals is described. The GPS receiver of the present invention provides reception and tracking a plurality of satellites simultaneously, using four separate receiver channels. The GPS receiver of the present invention includes an analog front-end for selecting an ...


2
Robert V Janc, Steven C Jasper, Lester A Longley, Katherine L Zebrose, William J Turney, Ross J Lillie: Digital radio frequency receiver. Motorola, Thomas G Berry, Steven G Parmelee, January 9, 1990: US04893316 (320 worldwide citation)

A digital radio receiver is described. The digital receiver of the present invention contemplates a digital radio receiver which operates on a received analog signal which has been converted to a digital form after preselection at the output of the antenna. The digital receiver of the present invent ...


3
Steven C Jasper: Method of doppler searching in a digital GPS receiver. Motorola, Thomas G Berry, James E Jacobson, Joseph T Downey, October 20, 1987: US04701934 (201 worldwide citation)

An improved method of doppler searching in a digital GPS receiver is described. According to the principles of the present invention, an N-point fourier transform is performed on samples of a down converted GPS signal representing the entire range of Doppler-shifted GPS carrier frequencies. The magn ...


4
Ross J Lillie, Steven C Jasper: FM demodulator. Motorola, Joseph T Downey, James E Jacobson, June 23, 1987: US04675882 (131 worldwide citation)

A digital FM demodulator is described. According to the principles of the present invention, a digital FM signal is demodulated by processing sampled input vectors of a quadrature FM digital signal centered approximately zero frequency. The sampled quadrature input vectors are quantized to lie withi ...


5
Steven C Jasper: Method and apparatus for compensation of imbalance in zero-if downconverters. Motorola, Susan L Lukasik, Raymond A Jenski, Steven G Parmelee, November 16, 1993: US05263196 (124 worldwide citation)

To compensate the audio distortion resulting from amplitude and phase imbalance in the quadrature oscillator (103) and mixers (105, 115) in zero-IF downconverters (203), a balancing action is required. An apparatus for distortion compensation compensates for the amplitude and phase imbalance to redu ...


6
Steven C Jasper, Kenneth J Crisler: Method for providing and selecting amongst multiple data rates in a time division multiplexed system. Motorola, Christopher P Moreno, July 2, 1996: US05533004 (112 worldwide citation)

In a Radio Frequency (RF) communication system using Time Division Multiple Access (TDMA) having time slots of a common duration, a quantity of information bits to be transmitted is provided. Based at least in part on the number of information bits to be transmitted, a modulation technique is select ...


7
Steven C Jasper, Mark A Birchler: Peak to average power ratio reduction methodology for QAM communications systems. Motorola, Joseph P Krause, January 10, 1995: US05381449 (96 worldwide citation)

The ratio of peak power level to average power level in a power amplifier used in a QAM communication system transmitter can be reduced by preselecting magnitudes and phase angles of complex-valued pilot symbols used in multi-channel, N-level QAM.


8
Steven C Jasper, Mark A Birchler, James D Solomon: Communication signal having a time domain pilot component. May 21, 1996: US05519730 (91 worldwide citation)

A quad 16 QAM transmission and reception methodology wherein a time domain pilot reference is advantageously associated therewith. There may be one or more such pilot references for each packet of multiple 16 QAM pulses. Depending upon the embodiment, each 16 QAM pulse can include a time domain pilo ...


9
Gregory W Cox, Robert F Lay, Douglas M Hamilton, Mark Gannon, Steven C Jasper, Manuel P Gabato: Method and apparatus for scheduling adaptation for a notch filter. Motorola, Susan L Lukasik, May 26, 1998: US05758275 (80 worldwide citation)

EMI spur interference is reduced in a system where the desired signal has periodically repeating components without destructively interfering with the repeating components. The frequency of the spur interference is determined (203) and fed to a notch filter (201) so as to center the notch at the fre ...


10
Daehyoung Hong, Steven C Jasper, Mark R Poulin: Convolutional decoder using soft-decision decoding with channel state information. Motorola, Susan L Lukasik, Raymond A Jenski, Steven G Parmelee, July 28, 1992: US05134635 (60 worldwide citation)

A convolutional decoder which assigns bit metrics to at least one bit of a symbol in a multilevel system. This decoder uses soft-decision Viterbi decoding with channel state information of a convolutionally-encoded communication transmitted using multilevel modulation.