Radio wave measuring apparatus for digital communication system

• US 5,825,817 A
• Filed: 07/19/1995
• Issued: 10/20/1998
• Est. Priority Date: 07/22/1994
• Status: Expired due to Fees

• Current Assignee: Anritsu Corporation
• Original Assignee: Anritsu Corporation
• Inventors: Tanaka, Takanori, Shimura, Yasuhiko, Yanagawa, Hirokazu
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US08/504,736
• Time in Patent Office: 1,189 Days
• Field of Search: 375/224, 375/228, 375/325, 375/326, 375/340, 455/67.1, 455/67.3, 455/67.7, 455/226.1, 455/226.2, 455/226.4, 455/525, 455/566, 370/252, 370/336, 370/345
• US Class Current: 375/228
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

In one aspect of this invention, a receiver sequentially demodulates sequentially received burst signals into original digital data signals. A data extraction unit extracts base station information from the digital data signals sequentially demodulated by the receiver. A level detector detects the signal levels of received signals containing the burst signals sequentially received by the receiver. A control unit causes a display unit to display the signal levels detected by the level detector in accordance with elapse of the reception time, and display the base station information extracted by the data extraction unit. In another aspect of this invention, a determination unit quantitatively determines errors of the burst signals from the digital data signals sequentially demodulated by the receiver, and outputs the determination results concerning the validity of the digital data contained in the burst signals. The data processing unit causes the display unit to display the measurement levels and the determination results concerning the validity of the data for designated base stations.

Claims

1. A radio wave measuring apparatus for measuring field intensities of radio waves to be measured including a plurality of burst waveform signals modulated by digital data signals, which are sequentially transmitted time-divisionally from a plurality of base stations and contain transmission source base station information, comprising:

a receiver having a digital data signal demodulator for receiving the radio waves and demodulating the digital data signals;

a timing signal generator for generating timing signals for extracting the transmission source base station information in synchronism with the burst waveform signals, in accordance with the radio waves received by said receiver;

an information detector for receiving the digital data signals output from said digital data signal demodulator and the timing signals output from said timing signal generator and detecting received information containing the transmission source base station information of the burst waveform signals;

a level measurement unit for detecting field intensities of the burst waveform signals contained in the radio waves received by said receiver; and

a data processing unit for outputting the field intensities of the burst waveform signals detected by said level measurement unit and the transmission source base station information detected by said information detector in a one-to-one correspondence with each other, on the basis of the timing signals from said timing signal generator.

2. An apparatus according to claim 1, wherein said receiver comprises:

an antenna for receiving the radio waves; and

a frequency converter for converting frequencies of the radio waves received by said antenna into a predetermined frequency suitable for signal analysis.

3. An apparatus according to claim 2, wherein said timing signal generator comprises:

an internal clock oscillator for oscillating a predetermined clock signal with which said digital data signal demodulator demodulates the digital data signals from the burst signals contained in the radio waves whose frequencies are converted by said frequency converter;

an internal clock synchronous circuit for synchronizing the digital data signals demodulated by said digital data signal demodulator with the clock signal from said internal clock oscillator;

a frame synchronous circuit for detecting a synchronous detection signal on the basis of the digital data signals synchronized with the clock signal by said internal clock synchronous circuit and the clock signal from said internal clock oscillator; and

a time control circuit for outputting a predetermined number of timing signals having a predetermined timing relationship, on the basis of the synchronous detection signal from said frame synchronous circuit.

4. An apparatus according to claim 3, wherein said information detector comprises:

a descramble circuit for descrambling the digital data signals synchronized with the clock signal by said internal clock synchronous circuit, in accordance with a first timing signal from said time control circuit; and

a data extraction unit for extracting the transmission source base station information corresponding to the burst signals from the digital data signals descrambled by said descramble circuit, in accordance with a second timing signal from said time control circuit.

5. An apparatus according to claim 4, wherein said level measurement unit comprises:

a logarithmic amplifier for logarithmically converting the burst signals contained in the radio waves whose frequencies are converted by said frequency converter;

an envelope detection circuit for detecting envelopes of the burst signals logarithmically converted by said logarithmic amplifier; and

a level detector for detecting signal levels corresponding to the burst signals on the basis of envelope detection signals from said envelope detection circuit, in accordance with a third timing signal from said time control circuit.

6. An apparatus according to claim 5, wherein said data processing unit includes a control unit for executing processing in which the signal levels corresponding to the burst signals, which are detected by said level detector, and the transmission source base station information corresponding to the burst signals, which are extracted by said data extraction unit, are displayed on a display unit in a one-to-one correspondence with each other.

7. An apparatus according to claim 6, wherein said data processing unit further comprises:

a data memory for temporarily storing the signal levels corresponding to the burst signals, which are detected by said level detector, and the transmission source base station information corresponding to the burst signals, which are extracted by said data extraction unit, in accordance with fourth and fifth timing signals from said time control circuit,

wherein the signal levels and the transmission source base station information corresponding to the burst signals, which are temporarily stored in said data memory, are transferred to said control unit in accordance with a sixth timing signal from said time control circuit.

8. An apparatus according to claim 7, wherein said data processing unit further comprises:

an operation unit for selectively entering to said control unit a plurality of display modes, a plurality of data processing modes, base station numbers, and measurement position information;

a storage unit including a plurality of memories for storing the plurality of display modes, the plurality of data processing mode, the base station numbers, and the measurement position information entered from said operation unit to said control unit; and

a display format memory for storing display formats corresponding to the plurality of display modes entered from said operation unit to said control unit.

9. An apparatus according to claim 8, wherein

the plurality of display modes include at least one of a time axis display mode and a processing result display mode, and

the processing result display mode includes at least one of a reception order, a signal level order, a base station number order, and a designated base station order, as a signal level display order, and at least one of graphic display and numerical display, as a display form.

10. An apparatus according to claim 8, wherein the plurality of data processing modes include at least one of mean value processing, median value processing, and maximum value processing.

11. An apparatus according to claim 4, wherein said information detector includes an error detection unit for detecting error determination data corresponding to the burst signals on the basis of the digital data signals descrambled by said descramble circuit, in accordance with a fourth timing signal from said time control circuit.

12. An apparatus according to claim 11, wherein said data processing unit includes a control unit for executing processing in which the signal levels corresponding to the burst signals, which are detected by said level detector, the transmission source base station information corresponding to the burst signals, which are extracted by said data extraction unit, and the error determination data corresponding to the burst signals, which are detected by said error detection unit, are displayed on a display unit in a one-to-one correspondence with each other.

13. An apparatus according to claim 12, wherein

said data processing unit further comprises:

a data memory for temporarily storing the signal levels corresponding to the burst signals, which are detected by said level detector, the transmission source base station information corresponding to the burst signals, which are extracted by said data extraction unit, and the error determination data corresponding to the burst signals, which are detected by said error detection unit, in accordance with fourth, fifth, and sixth timing signals from said time control circuit, and

the signal levels, the transmission source base station information, and the error determination data corresponding to the burst signals, which are temporarily stored in said data memory, are transferred to said control unit in accordance with a seventh timing signal from said time control circuit.

14. An apparatus according to claim 13, further comprising:

an operation unit for setting a reception frequency in said receiver and setting a plurality of display modes, a plurality of data processing modes, measurement position information, a measurement time, and base station numbers in said data processing unit.

15. An apparatus according to claim 14, wherein said data processing unit further comprises:

an arithmetic unit for performing desired processing for various data transferred from said data memory; and

a display memory for storing display data for displaying the various data transferred from said data memory and the data processed by said arithmetic unit in a desired format.

16. An apparatus according to claim 15, wherein said display memory includes a plurality of memories for storing the plurality of display modes, the plurality of data processing modes, the base station numbers, and the measurement position information which are set in said data processing unit by said operation unit.

17. An apparatus according to claim 16, wherein

the plurality modes include at least one of a time axis display mode and a processing result display mode, and

the processing result display mode includes at least one of a reception order, a signal level order, a base station number order, and a designated base station order, as a signal level display order, and at least one of graphic display and numerical display, as a display form.

18. An apparatus according to claim 16, wherein the plurality of data processing modes include at least one of mean value processing, median value processing, and maximum value processing.

19. A radio wave measuring apparatus for sequentially receiving burst signals time-divisionally radiated from a plurality of base stations and modulated by digital data signals containing base station information indicating transmission source base stations, and measuring received signal levels of the burst signals radiated from said base stations at a reception position, comprising:

a demodulator for sequentially receiving and demodulating the burst signals radiated from said base stations, and outputting demodulated digital data signals;

a timing signal generator for outputting a first timing signal for extracting the base station information and a second timing signal for detecting the received signal levels of the burst signals radiated from said base stations, upon receiving the demodulated digital data signals output from said demodulator;

a data extraction unit for extracting the base station information from the demodulated digital data signals output from said demodulator, upon receiving the first timing signal from said timing signal generator;

a level detector for detecting the received signal levels of the burst signals radiated from said base stations, upon receiving the second timing signal from said timing signal generator;

a data memory for storing the received signal levels detected by said level detector and the base station information extracted by said data extraction unit in a one-to-one correspondence with each other;

a display unit for displaying various information; and

a data processing unit for reading out the received signal levels and the base station information stored in a one-to-one correspondence with each other in said data memory, and causing said display unit to display readout received signal levels and base station information in one-to-one correspondence with each other, in accordance with elapse of a reception time.

20. An apparatus according to claim 19, wherein said data processing unit causes said display unit to display the received signal levels and the base station information stored in said data memory in an order of designated base station information, in accordance with elapse of the reception time.

21. An apparatus according to claim 19, wherein said data processing unit calculates signal levels of burst signals corresponding to the base station information from the received signal levels and the base station information stored in said data memory in accordance with a designated data processing mode, calculates desired values of the signal levels of the burst signals for the same base station information, and causes said display unit to display the calculated desired values together with the base station information.

22. An apparatus according to claim 21, wherein said data processing unit causes said display unit to display only designated base station information and desired values of signal levels of burst signals corresponding to the designated base station information.

23. An apparatus according to claim 21, wherein said data processing unit causes said display unit to display a graph in which an ordinate represents desired values of signal levels of burst signals and an abscissa indicates the base station information so that a given base station can be specified.

24. A radio wave measuring apparatus comprising:

a receiver for receiving burst waveforms of radio waves to be measured which are time-divisionally transmitted from a plurality of base stations and includes a plurality of predetermined information containing base station information indicating transmission source base stations and information necessary for transmission;

a timing generator for generating first and second timing signals synchronized with the burst waveforms contained in the radio waves received by said receiver;

an information detector for extracting the predetermined information contained in the radio waves received by said receiver, upon receiving the first timing signal from said timing generator;

a level measurement unit for measuring levels of the radio waves received by said receiver, upon receiving the second timing signal from said timing generator;

a determination unit for determining validity of the radio waves received by said receiver for each burst waveform, on the basis of the predetermined information extracted by said information detector; and

a data processing unit for outputting determination results of said determination unit and the levels of the radio waves measured by said level measurement unit in a one-to-one correspondence with the base station information contained in the predetermined information extracted by said information extraction unit.

25. A radio wave measuring apparatus comprising:

a measurement unit for sequentially receiving burst waveform signals of radio waves time-divisionally radiated from a plurality of base stations and modulated by digital data signals containing transmission source base station information, measuring received signal levels of the burst waveform signals radiated from said base stations at a reception position, and extracting the base station information;

a data memory for storing the base station information and the received signal levels of the burst waveform signals radiated from said base stations;

a data processing unit, including a processor, for combining individual data stored in said data memory to selectively process and output the data in a display format desired by a user; and

display means, connected to said processor, for displaying the base station information and the received signal levels of the burst waveform signals radiated from said base stations at at least a certain reception position in a one-to-one correspondence.

26. An apparatus according to claim 25, further comprising:

a receiver having a digital data signal demodulator for receiving the radio waves and, demodulating the digital data signals;

a timing signal generator for generating timing signals for extracting the transmission source base station information in synchronism with the burst waveform signals, in accordance with the radio waves received by said receiver;

an information detector for receiving demodulated digital data signals output from said digital data signal demodulator and the timing signals output from said timing signal generator and detecting received information containing the transmission source base station information of the burst waveform signals; and

a level measurement unit for detecting field intensities of the burst waveform signals contained in the radio waves received by said receiver.

27. An apparatus according to claim 25, wherein said measurement unit detects and outputs some errors of digital data contained in the burst waveform signals, and said data memory, said data processing unit, and said display means cooperate with each other so as to process the some errors of the digital data together with the transmission source base station information and the received signal levels of the burst waveform signals radiated from said base stations in a one-to-one correspondence.