Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-12-31
2000-08-22
Chin, Wellington
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455562, 34235708, 34235712, H04Q 732
Patent
active
061085642
ABSTRACT:
A technique for interference rejection at a sensor array is disclosed that employs a transformation on the output of the sensor array wherein the angular location of the source of each interfering signal constitutes the null-space of the transformation. For a sensor array of M sensor elements, the rejection of up to M-1 interferers is possible with a single transformation. One embodiment of the present invention comprises: receiving M signals, x.sub.0 (t) through x.sub.M-1 (t), at a frequency of .omega. radians/second at a sensor array comprising M spatially-disparate sensor elements, x.sub.0 through x.sub.M-1, wherein the M signals, x.sub.0 (t) through x.sub.M-1 (t), comprise a signal of interest incident on the sensor array at an angle .phi., and an interfering signal incident on the sensor array at an angle .psi..sub.1 ; transforming each of the M signals, x.sub.0 (t) through x.sub.M-1 (t), by a first factor based on .omega., .psi..sub.1, the speed of propagation of the interfering signal, and the distance between the sensor elements, x.sub.0 through x.sub.M-1, to form M intermediate products s'.sub.1 (t) through s'.sub.M-1 (t); and transforming each of the M intermediate products s'.sub.1 (t) through s'.sub.M-1 (t) by a second factor based on .omega., .PHI., .psi..sub.1, the speed of propagation of the interfering signal, and the distance between the sensor elements, x.sub.0 through x.sub.M-1, to form M signals s.sub.1 (t) through s.sub.M-1 (t).
REFERENCES:
patent: 5428818 (1995-06-01), Meidan et al.
patent: 5530725 (1996-06-01), Koch
patent: 5884192 (1999-03-01), Karlsson et al.
patent: 6009335 (1999-12-01), Murphy
Chin Wellington
Lucent Technologies - Inc.
Tran Pablo
LandOfFree
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