Radio environment analysis apparatus
First Claim
1. A radio environment analysis apparatus comprising:
- a receiver for receiving 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 a plane, converting the plurality of received signals into intermediate frequencies or demodulated signals, and outputting the resultant signals; and
a signal processor for processing a signal output from said receiver to analyze an arrival angle, delay time, and relative power of the signal incoming to said receiver,said signal processor having;
a plurality of normalization means for individually normalizing respective signals from said receiver and outputting the normalized signals as a normalized signal group;
first estimation means for calculating a covariance matrix from the signal group normalized by said normalization means, and estimating an arrival angle of each incoming signal using one of a 2D-MUSIC method and 2D-Unitary ESPRIT method;
arithmetic means for calculating a weight of said array antenna for suppressing incoming signals except for an incoming signal having the arrival angle estimated by said first estimation means, and calculating a product of the calculated weight of said array antenna and the normalized signal group; and
second estimation means for calculating a covariance matrix from a product signal group output from said arithmetic means, and estimating a delay time and relative power using one of the MUSIC method and ESPRIT method.
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Accused Products
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.
33 Citations
7 Claims
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1. A radio environment analysis apparatus comprising:
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a receiver for receiving 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 a plane, converting the plurality of received signals into intermediate frequencies or demodulated signals, and outputting the resultant signals; and a signal processor for processing a signal output from said receiver to analyze an arrival angle, delay time, and relative power of the signal incoming to said receiver, said signal processor having; a plurality of normalization means for individually normalizing respective signals from said receiver and outputting the normalized signals as a normalized signal group; first estimation means for calculating a covariance matrix from the signal group normalized by said normalization means, and estimating an arrival angle of each incoming signal using one of a 2D-MUSIC method and 2D-Unitary ESPRIT method; arithmetic means for calculating a weight of said array antenna for suppressing incoming signals except for an incoming signal having the arrival angle estimated by said first estimation means, and calculating a product of the calculated weight of said array antenna and the normalized signal group; and second estimation means for calculating a covariance matrix from a product signal group output from said arithmetic means, and estimating a delay time and relative power using one of the MUSIC method and ESPRIT method. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification