JP2007174206A - Receiver equipment, and its received signal processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exclusively demodulate a desired wave by discriminating the desired wave and interference waves close to each other and mixed, and suppressing only the interference waves, even if the incoming directions of electric waves fluctuate. <P>SOLUTION: In an antenna part 11, incoming electric waves are received by N antenna elements. In a direction measuring circuit 12, directional information on all the incoming electric waves is measured for N element antenna signals. In a signal comparison circuit 13, received signals of each electric wave are sorted into the desired wave and the interference waves by analyzing the signal levels and frequency components of the incoming electric waves of all the N element signals based on the directional information, and comparing them with respective analysis information for the desired wave and the interference waves stored beforehand. In an interference wave suppression circuit 14, the N element antenna signals are fetched from the antenna part 11, signals in the incoming directions of the interference waves are suppressed based on the signal comparison results, and only a signal in the incoming direction of the desired wave is extracted. In the modulation circuit 15, the extracted signal is modulated and an information signal transmitted by the desired wave is obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention measures the azimuth of an incoming radio wave with a sensor array system in which sensors such as a plurality of antennas are arranged, classifies the desired wave and the interference wave at a site where the interference wave is suppressed, suppresses the interference wave, and suppresses the desired wave. It is related with the receiver which receives only.

  Conventional receivers such as radio communication and radar devices constrain the beam with respect to the direction of arrival of the desired wave, and suppress the interference wave with respect to other directions in order to suppress the interference wave. of Power: a power directionality constraint minimization algorithm is used (see, for example, Patent Document 1). This DCMP is a method for minimizing the output power under the constraint condition in the weight. However, the DCMP algorithm suppresses even the desired signal when the direction of the actually arriving signal is different from the direction of constraining the beam. Conventionally, the direction of constraining the beam is MUSIC or the like each time. The direction is obtained from the direction measurement algorithm, and the direction is set as the direction to be restrained.

  However, in the conventional method as described above, when the desired wave and the interference wave are mixed in close proximity, if the arrival direction of the radio wave fluctuates, only the direction measurement algorithm such as MUSIC interferes with the direction of the desired wave. Cannot be distinguished from the wave direction. For this reason, not the interference wave but the desired wave is suppressed, and the desired wave may not be demodulated exclusively.

Patent Document 2 discloses a technique for performing a DCMP process based on a direction measurement result in a receiver using the DCMP method. However, the receiving apparatus disclosed in Patent Document 2 does not perform a process of distinguishing the desired wave and the interference wave from the azimuth measurement result, and does not eliminate the possibility of suppressing the desired wave by the DCMP process. Absent.
JP 2003-215231 A JP 09-199925 A

  As described above, in a receiving apparatus using the conventional DCMP algorithm, when the desired wave and the interference wave are mixed in close proximity, if the direction of arrival of the radio wave fluctuates, the direction measurement algorithm may be used. Since the direction of the wave and the direction of the interference wave cannot be distinguished, the desired wave, not the interference wave, is suppressed, and there is a possibility that the desired wave cannot be exclusively demodulated.

  The present invention has been made to solve the above problem, and even if the arrival direction of the radio wave fluctuates, the desired wave and the interference wave that are close together can be distinguished, and only the interference wave can be distinguished. An object of the present invention is to provide a receiving apparatus capable of suppressing and exclusively demodulating a desired wave, and a received signal processing method thereof.

  In order to solve the above problem, a receiving apparatus according to the present invention captures an antenna unit formed by arranging a plurality of antenna elements in an array and each element antenna signal of the antenna unit, and measures the direction of incoming radio waves. Based on the azimuth information, the azimuth measurement means obtains information including the signal levels and frequency components of all incoming radio waves from each element antenna signal of the antenna unit, compares the information with the information held in advance, and from the comparison result Corresponding to the interference wave based on the signal information that is input to each element antenna signal of the antenna unit and is distinguished by the signal comparison means An interference wave suppressing means for suppressing a azimuth signal; and a demodulation processing means for receiving and demodulating a signal in which an interference wave component is suppressed by the interference wave suppressing means. That.

  In addition, the received signal processing method according to the present invention includes an azimuth measuring step of capturing each element antenna signal from an antenna section formed by arranging a plurality of antenna elements in an array and measuring the azimuth of an incoming radio wave, and the azimuth information. Based on each element antenna signal of the antenna unit, the characteristic information of all incoming radio waves is obtained and compared with the characteristic information held in advance, and the received signal of each radio wave is distinguished from the desired wave and the interference wave from the comparison result. A signal comparison step, an interference wave suppression step of inputting each element antenna signal, and suppressing a signal of an azimuth corresponding to an interference wave based on the signal information distinguished in the signal comparison step, and the interference wave suppression step And a demodulation processing step for taking in and demodulating the signal in which the interference wave component is suppressed.

  Thus, in the present invention, the characteristics of individual incoming radio wave reception signals, such as signal level and frequency components, are analyzed based on the azimuth measurement results of all incoming radio waves, and compared with the analysis results obtained in advance. It distinguishes from the interference wave, suppresses only the interference wave, appropriately extracts the received signal of the desired wave, and exclusively demodulates it.

  According to the present invention, even if the arrival direction of the radio wave fluctuates, it is possible to distinguish between a desired wave and an interference wave that are close to each other, suppress only the interference wave, and exclusively demodulate the desired wave. It is possible to provide a possible receiving apparatus and a method for processing the received signal.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a DCMP adopting receiving apparatus according to the present invention. In FIG. 1, reference numeral 11 denotes an antenna unit in which N antenna elements are arranged in an array. The N element antenna signal of the antenna unit 11 is sent to the azimuth measuring circuit 12. This azimuth measurement circuit 12 takes in an N element antenna signal from the antenna unit 11 and measures the azimuth (hereinafter, azimuth information) of an incoming radio wave using an azimuth measurement algorithm such as MUSIC. The azimuth information is sent to the signal comparison circuit 13 together with the N element antenna signal. This signal comparison circuit 13 obtains information such as signal levels and frequency components of all incoming radio waves from the N element antenna signal and the direction information, compares the information with information held in advance, and compares each radio wave from the comparison result. The received signal is classified into a desired wave and an interference wave to obtain signal information of each radio wave received signal. The signal information obtained here is sent to the interference wave suppression circuit 14.

  The interference wave suppression circuit 14 receives an N element antenna signal from the antenna unit 11, constrains the beam in the direction of arrival of the desired wave based on the signal information from the signal comparison circuit 13, and arrives at the interference wave. In the direction, a weight for suppressing the beam is calculated and synthesized with an antenna signal to output a signal in which the interference wave is suppressed. The demodulating circuit 15 obtains an information signal (demodulated signal) transmitted by the desired wave by taking in and demodulating the signal in which the interference wave is suppressed by the interference wave suppressing circuit 14.

  In the above configuration, the processing procedure will be described below with reference to FIG.

  First, the antenna unit 11 receives incoming radio waves by N antenna elements (step S1). Next, the azimuth measurement circuit 12 measures the azimuth information of all incoming radio waves by performing arithmetic processing using an algorithm such as MUSIC on the N element antenna signal (step S2). Subsequently, the signal comparison circuit 13 analyzes signal levels and frequency components of the incoming radio waves of all N element antenna signals by FFT (Fast Fourier Transform) or the like based on the azimuth information, and stores the desired wave and interference wave previously held. By comparing with each analysis information (for example, past statistical processing results), the received signal of each radio wave is distinguished into a desired wave and an interference wave (step S3). Next, the interference wave suppression circuit 14 captures the N element antenna signal from the antenna unit 11, suppresses the signal in the interference wave arrival direction from the comparison result in the signal comparison circuit 13, and extracts only the signal in the desired wave arrival direction. (Step S4). Finally, the demodulating circuit 15 demodulates the extracted signal, thereby obtaining an information signal transmitted by the desired wave (step S5).

  From the above, if the present invention is applied, the characteristics of the individual incoming radio wave reception signals are analyzed based on the direction measurement results of all incoming radio waves, and the desired wave and the interference wave are compared with the analysis results obtained in advance. To distinguish. For this reason, even in the situation where the desired wave and the interference wave are mixed in close proximity, even if the direction of arrival of the radio wave fluctuates, it is possible to properly distinguish the desired wave and the interference wave. , And the received signal of the desired wave can be appropriately extracted and demodulated exclusively.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. For example, the process of each step shown in FIG. 2 can be realized by software by digitizing an N element antenna signal. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

The block diagram which shows the structure of one Embodiment of the DCMP adoption receiver based on this invention. The flowchart which shows the flow of the process of the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Antenna part, 12 ... Direction measuring circuit, 13 ... Signal comparison circuit, 14 ... Interference wave suppression circuit, 15 ... Demodulation circuit.

Claims (6)

An antenna section formed by arranging a plurality of antenna elements in an array;
Direction measuring means for capturing each element antenna signal of the antenna unit and measuring the direction of incoming radio waves,
Based on the azimuth information, the characteristic information of all incoming radio waves is obtained from each element antenna signal of the antenna unit, compared with the characteristic information held in advance, and the received signal of each radio wave interferes with the desired wave from the comparison result. Signal comparison means for distinguishing between waves,
Interference wave suppression means for inputting each element antenna signal of the antenna unit and suppressing a signal in a direction corresponding to an interference wave based on signal information distinguished by the signal comparison means;
A receiving apparatus comprising: demodulation processing means for taking in and demodulating a signal whose interference wave component is suppressed by the interference wave suppressing means.   The interference wave suppression means suppresses the interference wave component of the incoming radio wave using a DCMP (Directionally Constrained Minimization of Power) method that applies a weight to the received signal of the incoming radio wave and minimizes the output power under the constraint condition. The receiving apparatus according to claim 1.   The receiving apparatus according to claim 1, wherein the characteristic information is information including a signal level and a frequency component of an incoming radio wave. An azimuth measurement step for capturing each element antenna signal from an antenna section formed by arranging a plurality of antenna elements in an array and measuring the azimuth of an incoming radio wave,
Based on the azimuth information, the characteristic information of all incoming radio waves is obtained from each element antenna signal of the antenna unit, compared with the characteristic information held in advance, and the received signal of each radio wave interferes with the desired wave from the comparison result. A signal comparison step to distinguish between waves,
An interference wave suppression step of inputting each element antenna signal and suppressing a signal of an azimuth corresponding to an interference wave based on the signal information distinguished in the signal comparison step;
A received signal processing method, comprising: a demodulation processing step of taking in and demodulating the signal in which the interference wave component is suppressed in the interference wave suppression step.   In the interference wave suppression step, the interference wave component of the incoming radio wave is suppressed using a DCMP (Directionally Constrained Minimization of Power) method that applies a weight to the received signal of the incoming radio wave and minimizes the output power under the constraint condition. The received signal processing method according to claim 4. 5. The received signal processing method according to claim 4, wherein the characteristic information is information including a signal level and a frequency component of an incoming radio wave.

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