| Patent Number |
Title Of Patent |
Date Issued |
| 6441694 |
Method and apparatus for generating digitally modulated signals |
August 27, 2002 |
| A method and apparatus for generating digitally modulated signals in which a serial data stream of digital signals to be modulated (70) is provided, the serial data stream being converted into real and imaginary components (74) which are then converted into a complex polar signal (80) |
| 6184827 |
Low cost beam steering planar array antenna |
February 6, 2001 |
| A planar array antenna for use with an earth-based subscriber unit generates receive or transmit communications beams through the use of digital beamforming networks (210, 211) which provide beam steering in a first dimension. In another dimension, the communications beams are synthe |
| 6169522 |
Combined mechanical scanning and digital beamforming antenna |
January 2, 2001 |
| A mechanical scanning and digital beamforming antenna (20, FIG. 2) uses a receive and transmit digital beamforming network (FIG. 3, 410, 320) to provide communications beam scanning in a first plane. In a second plane, a reflective surface (FIG. 2, 240) is used to focus and scan the |
| 6100756 |
Method and apparatus for high efficiency power amplification |
August 8, 2000 |
| A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), a soft switch modulator (270), and a power amplifier (260). The soft switch modulator (270) drives a high side switch (3 |
| 6075484 |
Method and apparatus for robust estimation of directions of arrival for antenna arrays |
June 13, 2000 |
| A direction of arrival (DOA)-aided digital beamforming (DBF) subsystem (300 FIG. 3) is provided for mitigating interference and increasing the frequency reuse factor in communication systems. The DOA-aided DBF subsystem is used to accurately position beams and nulls in at least one a |
| 6061023 |
Method and apparatus for producing wide null antenna patterns |
May 9, 2000 |
| An enhanced digital beamformer (EDBF) (210, FIG. 2) is provided for use in a transceiver subsystem (200, FIG. 2) for mitigating interference and increasing the frequency reuse factor in communication systems. The EDBF is used to produce wide nulls (520, FIG. 5) in at least one steerable |
| 6038265 |
Apparatus for amplifying a signal using digital pulse width modulators |
March 14, 2000 |
| An electronic apparatus that includes a digital processor (12), a first digital pulse width modulator (304), a second digital pulse width modulator (306), a combining circuit (308), and a load (310). The digital processor (12) produces a first digital signal (314) and a second digital |
| 6032168 |
Computer system to perform a filter operation using a logarithm and inverse-logarithm converter |
February 29, 2000 |
| In a parallel computer system having N parallel computing units a data pipeline connects all the computing units. In addition the computing units are coupled to a random access memory so that each computing unit is assigned to one column of the memory array. To perform a digital signal |
| 6002375 |
Multi-substrate radio-frequency circuit |
December 14, 1999 |
| A radio-frequency circuit (20) includes a hybrid integrated circuit (24) having a passive circuit element (38) and a d-c biasing circuit element (54) embedded within a first substrate (32) of a low cost and rugged first semiconducting material, and first and second active circuit element |
| 5961579 |
Apparatus using a logarithm based processor |
October 5, 1999 |
| An apparatus that includes a logarithm based processor (216) having at least one digital logarithm converter (202) and a power amplifier (208) responsive to the logarithm based processor (216). |
| 5920596 |
Apparatus for amplifying a signal using a digital processor |
July 6, 1999 |
| An apparatus for amplifying a signal that includes a digital processor (12) producing a first digital signal (20) and a second digital signal (22), a pulse width modulator (32) receiving the first digital signal (20) and producing a pulse width modulated signal, an amplitude restoration |
| 5917447 |
Method and system for digital beam forming |
June 29, 1999 |
| A digital beam forming system includes an array of computing units (60-76) for weighting incoming signals and a plurality of summing processors (80-84) for generating output signals that represent weighted sums corresponding to rows within the array. The digital beam forming system c |
| 5856804 |
Method and intelligent digital beam forming system with improved signal quality communications |
January 5, 1999 |
| An intelligent digital beam former (10) in conjunction with a satellite based array antenna (20) provides a plurality of dynamically controllable antenna beams (52) for communication with subscriber units on earth's surface. The location of a subscriber unit (90) requesting communication |
| 5754139 |
Method and intelligent digital beam forming system responsive to traffic demand |
May 19, 1998 |
| An intelligent digital beam former (10) in conjunction with a satellite based array antenna (20) provides a plurality of dynamically controllable antenna beams (52) for communication with subscriber units (90) in response to demand for communication services. Geographic portions within |
| 5754138 |
Method and intelligent digital beam forming system for interference mitigation |
May 19, 1998 |
| An intelligent digital beam former (10) in conjunction with a satellite based array antenna (20) provides a plurality of dynamically controllable antenna beams (52) for communication with subscriber units (90) on earth's surface. Interference is mitigated placing a null in the transmit a |
