JP2004072665A - Cdma air monitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a CDMA air monitor wherein analysis of radio data is enabled when required always and analyzing of data can be regenerated any number of times. <P>SOLUTION: The CDMA air monitor which is equipped with a storage device 8 of a large capacity which uses magnetic medium evaluates quality of communication and inspects communication system, by receiving a signal of a radio zone between a base station and a mobile apparatus in CDMA mobile communication and analyzing a received signal. An RF receiver 2 amplifies a signal received with an antenna 4 and drops frequency of the signal to a specified frequency band. The signal output from the RF receiver 2 is subjected to AD conversion and demodulation with an AD conversion part 6. The demodulated radio data are recorded once in the storage device 8 via a switching part 10 arranged among the AD conversion part 6, the storage device 8 and data analyzing parts 16, 18. After that, the storage device 8 and the data analyzing parts 16, 18 are connected with the switching part 10, and the data analyzing parts 16, 18 regenerate radio data recorded in the storage device 8 by off-line and analyze the data. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention receives a signal in a radio section between a base station and a mobile station in CDMA (Code Division Multiple Access) mobile communication, evaluates communication quality by analyzing the received signal, and evaluates a communication system (base station, terminal). The present invention relates to a CDMA air monitor for performing the inspection of (1).
[0002]
[Prior art]
Heretofore, this type of CDMA air monitor has performed an analysis process in real time by directly transmitting data AD-converted and demodulated by an AD conversion unit to a data analysis unit without recording received data in a recording device.
[0003]
[Problems to be solved by the invention]
Since the state of the radio wave changes with time, it is impossible to set optimal parameters by real-time analysis. In the conventional real-time analysis method, the analysis channel setting and parameter setting are performed before reception starts, so if there is an error in the setting, the analysis result has no meaning and the parameter setting and data reception must be performed again from the beginning. Was. Also, when performing an analysis by changing parameters, it is necessary to retake data from the beginning. Recording of received data requires a high-speed recording device to follow the signal speed, and a normal hard disk cannot secure a sufficient speed. Especially after data acquisition in the field, it is necessary to save the data in order to perform analysis in the laboratory. In addition, it is necessary to obtain various parameters and basic data that change with time from the acquired wireless data, and for that purpose, it is necessary to repeatedly analyze the data using software having a learning function.
In the real-time analysis, reception and analysis are performed at the same time, so that the analysis range is limited, and detailed analysis cannot be performed in detail.
An object of the present invention is to solve the above problems.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention receives a signal in a radio section between a base station and a mobile station in CDMA mobile communication, and performs an inspection, evaluation, and the like of a communication quality and a communication system by analyzing the received signal. An RF receiver for amplifying a signal received by an antenna and lowering the signal to a predetermined frequency, an AD converter for AD converting and demodulating a signal converted by the RF receiver, and an AD converter. A large-capacity storage device using a magnetic medium for recording the read data, a data analysis unit for analyzing received data, a display unit for displaying an analysis result of the data analysis unit, and the AD conversion Unit and a switching unit installed between the storage device and the data analysis unit, and has a function of offline analyzing data once recorded in the storage device. It is characterized in that.
Further, the present invention has a function of connecting the AD conversion unit and the data analysis unit by switching the switching unit and performing a real-time analysis online without passing through a storage device. is there.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Reference numeral 2 denotes an RF receiving unit, which receives an uplink signal in a wireless section between a base station and a mobile device in a CDMA mobile unit with an antenna 4, amplifies the received signal with an amplifying unit, and a down-converting unit. Downconvert to intermediate frequency.
[0006]
Reference numeral 6 denotes an AD converter, which performs AD conversion and demodulation of wireless data received from the RF receiver 2. Reference numeral 8 denotes a large-capacity (320 GB) and high-speed storage device using a magnetic medium, which can record a signal for a maximum of 20 minutes. The input / output unit of the storage device 8 is connected to the output side of the AD conversion unit 6 via the switches 24 and 22 of the switching unit 10. The input / output unit of the storage device 8 is connected to the preprocessing unit 14 via switches 24 and 26. Each of the switches 24, 22, and 26 is configured by a switching circuit using a switching element such as a transistor, and is configured to be turned on / off, that is, opened and closed by an on / off control unit 28.
[0007]
The AD converter 6 performs IQ separation of the received signal by multiplying the received signal by a reference wave having the same frequency. However, the phase and frequency of the received signal and the reference wave need to be substantially the same. Since the frequency of the received signal cannot be known until it is received, the pre-processing unit 14 compares the signal actually received with the reference wave and feeds back the signal, thereby adjusting the frequency and phase of the reference wave to the received signal.
[0008]
In the real-time analysis, it is necessary to receive preliminary data and perform pre-processing and then acquire data. In the offline analysis, since this pre-processing is performed by software, there is no need to perform this processing before acquiring data. Reference numeral 16 denotes a physical channel data analysis unit which analyzes the received data to obtain a channelization code and a scramble code. (Since the data is spread after being modulated by these two codes and then transmitted, the receiving side performs the reverse process.) The despreading is performed using the channelization code and the scramble code, and the data before spreading is returned.
[0009]
Reference numeral 18 denotes a transport channel data analysis unit, which performs processing such as error correction and block combination on data before spreading obtained by physical channel analysis to obtain data actually transmitted. Reference numeral 20 denotes an analysis result display unit. In the process at the time of data transmission, an error correction code is added to original data in a transport channel, divided into block units, data of some channels are added, mapped to a physical channel, spread, Modulate and transmit. The configuration of the device that handles the downlink radio signal is configured in the same manner as the above-described device for the uplink.
[0010]
In the above-described configuration, the CDMA signal of the uplink and the downlink between the base station and the mobile phone in the mobile communication is received by the antenna 4, the received signal is amplified by the RF receiving unit, and the AD conversion unit 6 performs the AD conversion. Performs conversion and demodulation. For this wireless data, a wireless data signal for a maximum of 20 minutes is temporarily recorded in the storage device 8 through the switches 22 and 24 of the switching unit 10. At this time, the switch 26 is off.
[0011]
After the recording in the storage device 8 is completed, the switch 22 of the switching unit 10 is turned off, the switch 26 is connected (turned on), and the wireless data recorded in the storage device 8 is sequentially transmitted to the physical analysis channel data analysis unit 16. Is sent to the transport channel data analysis unit 18. Here, the data is analyzed off-line as needed. The analyzed data is displayed on the analysis result display unit 20.
[0012]
The switching unit 10 is also configured so that the switch 24 can be turned off and the switches 22 and 26 can be turned on to put the apparatus in an online mode. In this online mode, wireless data can be analyzed in real time without passing through the storage device 8. Both downlink wireless data and uplink wireless data are processed according to the same principle.
[0013]
【The invention's effect】
Since the present invention is configured as described above, the analysis of wireless data can be performed whenever necessary and can be reproduced many times. In addition, parameters can be set after recording, so parameters can be easily changed. In addition, there is an effect that detailed analysis over details that cannot be performed by real-time analysis can be performed.
[Brief description of the drawings]
FIG. 1 is a block diagram of the present invention.
FIG. 2 is an explanatory block diagram of a main part of the present invention.
[Explanation of symbols]
2 RF receiving unit 4 Antenna 6 AD conversion unit 8 Storage device 10 Switching unit 14 Preprocessing unit 16 Physical channel data analysis unit 18 Transport channel data analysis unit 20 Analysis result display unit 22 to 26 Switch 28 ON / OFF control unit

Claims (2)

A CDMA air monitor that receives a signal in a wireless section between a base station and a mobile station in CDMA mobile communication, and analyzes and analyzes the received signal to check and evaluate communication quality and a communication system. An RF receiving unit for amplifying the converted signal and lowering the signal to a predetermined frequency, an AD converting unit for AD converting and demodulating the signal converted by the RF receiving unit, and a magnetic recording unit for recording the AD converted data. A large-capacity storage device using a medium, a data analysis unit for analyzing received data, a display unit for displaying an analysis result of the data analysis unit, and a communication unit between the AD conversion unit, the storage device, and the data analysis unit. And a switching unit installed in the storage device, and having a function of analyzing data once recorded in the storage device offline. Over the monitor. 2. The apparatus according to claim 1, further comprising a function of connecting the AD conversion unit and the data analysis unit by switching the switching unit, and performing a real-time analysis online without using a storage device. CDMA air monitor.

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