Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1999-06-01
2000-07-04
Vo, Don N.
Pulse or digital communications
Receivers
Interference or noise reduction
375148, 342147, H04B 710, H04L 102
Patent
active
060849282
ABSTRACT:
A radio environment analysis apparatus includes a receiver and signal processor. The receiver receives a signal modulated by phase shift keying (PSK) using a pseudo noise (PN) code sequence by an array antenna at a plurality of fixed points on the plane, converts the received signals into intermediate frequencies or demodulated signals, and outputs them. The signal processor processes a signal output from the receiver to analyze the arrival angle, delay time, and relative power of the signal incoming to the receiver. The signal processor has a plurality of normalization units, first estimation unit, arithmetic unit, and second estimation unit. The normalization units individually normalize signals from the receiver and output them as a normalized signal group. The first estimation unit calculates a covariance matrix, and estimates the arrival angle of each incoming signal. The arithmetic unit calculates a weight of the array antenna for suppressing incoming signals except for an incoming signal having the estimated arrival angle, and calculates the product of the weight of the array antenna and the normalized signal group. The second estimation unit calculates a covariance matrix and estimates the delay time and relative power.
REFERENCES:
patent: 4965732 (1990-10-01), Roy, III et al.
patent: 5930243 (1999-07-01), Parish et al.
"High-Resolution Analysis of indoor Multipath Propagation Structure", IEICE Trans. Commun., vol. E78-B, No. 11, pp. 1450-1457, Nov. 1995.
"Estimation of Propagation Delay Time and Direction of Arrival of Indoor Quasi-Millimeter Multipath Waves Using FFT-Music with Triangular Antenna Array", Technical Report of IEICE, A.cndot.P95-120, pp. 79-84, Feb. 1996.
"High-Resolution 3-D Direction-of-Arrival Determination for Urban Mobile Radio", IEEE Transactions on Antenna and Propagation, vol. 45, No. 4, Apr. 1997, pp. 672-682.
"Paired Estimation of Propagation Delay Times and Directions of Arrival of Multipath Waves Using 2D Unitary Esprit", Technical Report of IEICE, A.cndot.P97-78, Jul. 1997, pp. 53-60.
NEC Corporation
Phu Phuong
Vo Don N.
LandOfFree
Radio environment analysis apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radio environment analysis apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio environment analysis apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1493197