JPH02158222A - Performance evaluation device for radio communication - Google Patents

Abstract

PURPOSE:To attain highly accurate evaluation of radio communication by applying the performance evaluation executed between a mobile station and a stationary station based on the result of transmission and reception of a pseudo random pattern between both the stations continuously and consecutively. CONSTITUTION:One of the stationary station 20 and the mobile station 10 sends a pseudo random pattern, the stationary station 20 or the mobile station 10 receiving the pseudo random pattern reply the received signal without any modification, and the performance of the radio communication is evaluated by comparing the transmission and the reply signal. Thus, the performance of the radio communication implemented between the stationary station 20 and the mobile station 10 moving with respect to the stationary station 20 is consecutively and continuously evaluated. Then even in the radio communication system whose relative position is always changing, the performance is accurately and surely evaluated.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is a wireless communication system that evaluates the performance of wireless communication between a fixed station and a mobile station that is moving relative to the fixed station. Communication performance evaluation device related to wireless communication.

[Prior Art] Conventionally, various methods have been used to evaluate the performance of wireless communications between a fixed station and a mobile station for the following reasons.

In the case of wireless communication, the communication status fluctuates drastically due to the influence of the surroundings on radio waves. For this reason, when the surrounding environment for wireless communication is unspecified, it is desirable to actually evaluate the performance and confirm whether or not communication can be performed accurately. For example, in an environment where there are many metal objects around, signals may become weak due to reflection or absorption of radio waves by the metal objects, or may cancel or overlap, making communication impossible.

The method for evaluating the performance of wireless communication is as follows: - When fishing on a boat, one fixed station or mobile station transmits predetermined information used in actual wireless communication, and the other fixed station or mobile station transmits the predetermined information. A method is adopted to confirm whether or not the received message is accurately received. According to this method, the performance can be evaluated under the same conditions as actual wireless communication, so the evaluation is highly reliable and is widely used.

In addition, there is a method of measuring shikoden and different strength to relatively easily evaluate the performance of wireless communication. One of the fixed station or mobile station is in the transmitting state, and the other fixed station is stationary.
A spectrum analyzer is used to measure the electric field strength in the area 1a where the station is installed, and it is determined whether the electric field strength necessary for reception can be obtained.

(-Problems to be solved by the invention: 1 Yes, 1%) The following problems remain unsolved in conventional wireless communication performance evaluation methods.

Performance evaluation methods that measure electric field strength require an expensive spectrum analyzer and cannot provide accurate performance evaluation. That is, as described above, in an environment where there is a lot of radio wave reflection, such as when there are metal objects around, the reflected waves and signal waves overlap, so although communication information is lost, the electric field strength may become stronger. Therefore, under such an environment, it is not possible to accurately evaluate the performance of wireless communication by simply measuring the electric field strength.

On the other hand, the performance evaluation of wireless communication that transmits and receives predetermined information used in actual wireless communication is 5, and there are no problems. However, since the performance is evaluated by transmitting and receiving predetermined information, it is not possible to conduct performance evaluation l) sporadically and intermittently only during the period during which the predetermined information is transmitted and received. For example, in order to evaluate the performance of wireless communication performed between a fixed station and a mobile station that is moving relative to the fixed station, it is necessary to Continuous and continuous performance evaluation of wireless communication in all the positional relationships must be carried out in response to the above-mentioned wireless communication system. I can't deal with it. Particularly, this becomes a big problem when the wireless communication environment changes, for example when the metal object in the previous example moves. Furthermore, if performance is evaluated sporadically or intermittently, there is not always a one-to-one correspondence between the time when the performance evaluation is made and the position to which the mobile station has moved, making it difficult to utilize the performance evaluation effectively. It was difficult.

The present invention has been made to solve the above problems, and is capable of continuously and continuously evaluating the performance of wireless communication.
An object of the present invention is to provide a wireless communication performance evaluation device that can accurately and reliably evaluate the performance of a wireless communication system in which the relative positions of a fixed station and a mobile station constantly change.

[Means for Solving the Problems] The structure of the present invention made to achieve the above object is as follows:
As shown in the figure, a wireless communication performance evaluation device evaluates the performance of wireless communication performed between a fixed station N installed at a predetermined location and a mobile station M moving relative to the fixed station N. A transmitting means C1 provided in either the fixed station N or the mobile station M and transmitting a pseudo-random pattern, and a transmitting means C1 provided in the other fixed station N or mobile station M where the transmitting means C1 is not provided. and upon receiving the pseudo-random pattern transmitted by the transmitting means C1, a replying means C2 transmits the received pseudo-random pattern again; and one of the fixed station N or mobile station M provided with the transmitting means C1. Comparing means C3, which is provided in and receives the pseudo-random pattern transmitted by the replying means C2 and compares the received pseudo-random pattern with the pseudo-random pattern transmitted by the transmitting means C1. Its gist is a wireless communication performance evaluation device.

[Operation] In the wireless communication performance evaluation device of the present invention, the transmitting means C
1 is provided in either the fixed station N or the mobile station M, and transmits a pseudo-random pattern. Here, the pseudo-random pattern is not a truly random signal sequence, but a signal bit sequence that is pseudo-random because it has long periodicity.

The reply means C2 provided in the other fixed station N or mobile station M which is not provided with the transmission means C1 is
The pseudo-random pattern transmitted by the receiver is received, and the pseudo-random pattern is transmitted again. That is, the content received from the transmitting means C1 is retransmitted as is.

Further, a comparison means C3 having the following function is further provided between one of the fixed stations N where the transmission means C1 is provided or between the mobile stations. The comparing means C3 has a receiving function of receiving the pseudo-random pattern transmitted from the replying means C2, and a comparing function of comparing the received pseudo-random pattern with the pseudo-random pattern transmitted by the transmitting means C1. That is, the two pseudo-lump patterns that the comparison means C3 compares are essentially the same, and if there is a mismatch, it is due to the difference between the sending means C1 and the replying means C.
It is presumed that the communication information was lost during the communication process from the reply means C2 to the comparison means C3 or from the reply means C2 to the comparison means C3.

In other words, the comparison result of the comparison means C3 corresponds to the performance of the wireless communication performed between the fixed station N and the mobile station M, and the degree of coincidence of the pseudorandom patterns to be compared is determined by the performance of the wireless communication performed between the fixed station N and the mobile station M. It becomes a performance indicator.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to explain the present invention more specifically, one embodiment of the present invention will be described below with reference to the drawings.

[Embodiment Fig. 2 shows a fixed mobile station 10 that is attached to each of a large number of products on the production line F of a factory, and that performs wireless communication of production management information, etc. between the mobile stations 10. 1 is an electric circuit block diagram of a wireless communication system in which a performance evaluation device of an embodiment is added to a station 20. First, the mobile station 10 attached to a product will be described.

The mobile station 10 includes a filter 10b having a passband of the same frequency as the frequency of the radio waves transmitted from the fixed station 20, in order to extract only necessary information from the large number of radio waves received by the first receiving antenna 10a. After selecting a radio wave through a demodulator 10c, the high frequency is demodulated to reproduce necessary information.

The reproduced information is input to a logic circuit 10d that performs a predetermined logic operation, and various information processing is performed here, including reply processing for performance evaluation, which will be described later. Note that the code analysis code, identification information of each mobile station 10, etc. necessary for this information processing are stored in advance in the memory 10e.

Furthermore, the mobile station 10 is provided with a second receiving antenna 10e, and receives unmodulated forward transmission waves transmitted from the fixed station 20 by this antenna 10e.

Then, the mixer 10f uses the received non-modulated forward transmission wave to modulate the transmission signal output from the logic circuit 10d and transmits it from the return antenna 10g. As a result, the mobile station 10 can be configured without a large power consuming circuit such as a local oscillation circuit, and can transmit necessary information while being small and lightweight.

Next, the fixed station 20 will be explained.

As described above, the fixed station 20 uses a signal transmission antenna 20a for transmitting necessary signals such as production management information to the mobile station 10, and transmits non-modulated sequential transmission waves! a reply information receiving antenna 20c that receives signals transmitted from the reply antenna 10e of the mobile station 10 and the reply antenna 10e of the mobile station 10.
It has three types of antennas.

Modulator 20 that supplies high frequency to signal transmission antenna 20a
d, a first oscillator 20e that generates a stable high frequency wave as a carrier wave and a transmission signal as a signal to be transmitted are manually input. Here, the transmission signal is configured so that two types of signals are selectively inputted via a switch 2Of.
The following two types of signals are generated manually.

The first signal is a pseudo-random pattern signal generated by a pseudo-random pattern generator 20g provided inside the fixed station 20, and is a signal bit sequence that has sufficiently long periodicity and is pseudo-random. .

The second signal is a signal manually inputted from the information input terminal 20h of the fixed station 20, and is production management information etc. manually inputted from the controller 30.

Note that the switching of the transmission information by the switching device 2Of is performed based on a switching signal input manually from the switching input terminal 20i of the fixed station 20.

Further, a carrier wave oscillator 20j that transmits a carrier wave for supplying power to the mobile station 10 is connected to the carrier wave transmitting antenna 20b, which is the other transmitting antenna.

A filter 20k is connected to the remaining reply information receiving antenna 20c for selectively extracting only the information transmitted from the reply antenna 10g from among the large number of received radio waves, and after the necessary radio waves are selected, the demodulator 201 is demodulated and the necessary information is reproduced. The demodulated information is output to the controller 30 from the first output terminal 20m of the fixed station 20, and is also output to the comparator 20 built in the fixed station 20.
It is man-powered by n. In this comparator 2On, in addition to the demodulated information, a pseudorandom pattern signal generated by a pseudorandom pattern generator 20g is manually input.
Compare the information between the two and send the result to the second output terminal 2.
Output to the controller 30 from 0o.

In the wireless communication system configured as described above, information necessary for production management is transmitted and received between a large number of mobile stations 10 and fixed stations 20, but prior to such actual communication, The performance evaluation device of the embodiment performs the following performance evaluation, and the timing of communication, the installation position of the antenna, etc. are confirmed. Performance evaluation performed between the mobile station 10 and the fixed station 20 will be described below.

Note that the performance evaluation described below is performed between a fixed station 20 and a mobile station 10 that is moving with respect to the fixed station 20, that is, it is performed in an environment where the relative positional relationship changes. It is something that can be done.

3(a) and (b) are flowcharts showing the process of performance evaluation processing executed by the performance evaluation device of the embodiment, and FIG. 3(a) shows the process executed by the mobile station 10. The figure (b) shows the process executed by the fixed station 20, respectively. Hereinafter, when explaining this process, (a) the explanation of the process shown in the figure will be distinguished by adding a subscript a to the step number, and (b) the explanation of the process shown in the figure will be distinguished by adding the subscript ``s''. do.

In the performance evaluation process, a switching signal is manually input from the controller 30 to the switching input terminal 201 of the fixed station 20, and the switching signal is input to the switching input terminal 201 of the fixed station 20.
is inputted manually from the information input terminal 20h to the modulator 20.
d (step 10).
b). Then, the controller 30 outputs a performance evaluation start command to the information input terminal 20h to notify the mobile station 10 that the performance evaluation process is about to start (step 12b). In the fixed station 20, the information input terminal 2
Since the manually input start command from 0h is input to the modulator 20d via the switch 2Of, the signal transmitting antenna 20a
The start command is then transmitted to the mobile station 10 (step 14b). Sending this start command (step 12b,
Step 14b) is repeatedly executed until the mobile station 10 issues a signal indicating that it is ready for the performance evaluation process (step 16b).

On the other hand, in the mobile station 10, when the first receiving antenna 10a receives the start command transmitted from the fixed station 20, the demodulator 10c demodulates the received signal, and the logic circuit 10d decodes the demodulated start command. . The memory 10e, which stores information for this decoding process, stores in advance a control procedure to be executed in response to the start command, and the logic circuit 10d controls the internal state of the mobile station 10 according to the control procedure. Step 10a to control the state according to the evaluation process
), transmits from the return antenna 10g that the preparation for starting the performance evaluation process is completed (step 12a) 6 On the fixed station 20 side, when the return information receiving antenna 20C receives the ready status of the mobile station 10, the fixed station 20 transmits that information. Demodulated by a demodulator 201 and inputted to the controller 30,
It is determined that the mobile station 10 has completed preparation (step 16b). Then, the controller 30 outputs the switching signal again, and the pseudo random pattern generator 20g and the modulator 2
0d and starts transmitting a pseudorandom pattern from the signal transmitting antenna 20a (step 1 day b).

As a result, the first receiving antenna 10a of the mobile station 10 receives the pseudo-random pattern, but the logic circuit 10d transmits the received pseudo-random pattern as it is to the mixer 10f, and transmits it from the return antenna 10g. (Step 14a). That is, the mobile station 10 side does not perform any signal conversion or the like, and directly returns the received contents.

Fixed station 20 that received the returned pseudo-random pattern
In step 2, the comparator 2On compares the received pseudorandom pattern with the pseudorandom pattern generated by the pseudorandom pattern generator 20g.
0b), and input the result to the controller 30 manually. The controller 30 then transfers this comparison result to the mobile station 10.
and the fixed station 20, the step 22b) transmits a pseudo-random pattern from the fixed station 20 until sufficient information is obtained to make an accurate performance evaluation. (step 24b).

Here, the performance evaluation of wireless communication executed by the controller 30 refers to how often there are discrepancies between the two pseudo-random patterns based on the comparison of the comparator 2On, and how often discrepancies occur. This is processing such as storing time. That is, the pseudo-random pattern received from the mobile station 10 is a direct reply of the one generated by the pseudo-random pattern generator 20g, and should originally match perfectly. Therefore, if a mismatch occurs between these two signals, it is due to information being transmitted during the wireless communication from the fixed station 2° to the mobile station 10 or from the mobile station 10 to the fixed station 20. is incomplete, meaning that some information has been lost. Therefore, by calculating the frequency of occurrence of such wireless communication failures, it is possible to evaluate the overall wireless communication performance. Furthermore, if such a wireless communication problem occurs at a limited time, the mobile station 10 and fixed station 2 at that time
It can be determined that the positional relationship with 0 is inappropriate for wireless communication.

When the wireless communication performance is accurately evaluated based on the information accumulated by transmitting the pseudo-random pattern and receiving the returned pseudo-random pattern, the controller 30 operates the switch 2Of, and the controller 30
The end command of the performance evaluation process outputted from the modulator 20d is transmitted to the mobile station 10, and the internal state is changed to be suitable for wireless communication of normal production management information (
Step 26b), completing the performance evaluation process.

When the mobile station 10 side receives the termination command sent from the fixed station 20, it terminates the reply processing up to that point and changes its internal state to one suitable for wireless communication of normal production management information. (Step 16a), the performance evaluation process is completed.

Through the series of processes described above, it is possible to evaluate the performance of wireless communication performed between the mobile station 10 and the fixed station 20. The results of the performance evaluation obtained in this way will be used when actually operating the wireless system of the above embodiment.
It is used to determine communication conditions such as the installation position of the fixed station 20, the arrangement of each antenna, and the timing of wireless communication, and ensures that the wireless communication of original production management information carried out between both stations is performed reliably and accurately. It becomes like this.

In addition, in the above embodiment, in order to simplify the explanation, it was simply described that pseudorandom pattern signals are transmitted and received from the mobile station 10 and the fixed station 20 as appropriate, and the circuit configuration was explained. mobile station 10 and fixed station 2
Known techniques for preventing interference between 0 and 0 are employed. For example, interference prevention techniques are used, such as transmitting with a different polarization plane for each round or using different modulation methods.

According to the wireless communication performance evaluation apparatus of the present embodiment described above, the following effects are obvious.

The performance evaluation performed between the mobile station IO and the fixed station 20 is performed based on the results of continuously and continuously transmitting and receiving pseudorandom patterns between the two stations.

Therefore, it can be determined whether information is actually transmitted and received accurately or not, and evaluation can be performed with higher accuracy than with a performance evaluation method that simply measures electric field strength. Moreover, continuous and continuous performance evaluation is possible, making it extremely suitable for performance evaluation of the wireless communication system of this embodiment in which the positional relationship between both stations changes constantly.

In addition, since a pseudo-random pattern is used as the transmission and reception information between the two stations, firstly, the performance evaluation is based on a signal that approximates the production control information that is the original communication information, and the reliability of the result is lower than before. considerably higher in comparison. Second, the spectral interval of the communication power spectrum is constant and wideband, making it possible to perform comprehensive performance evaluations. Thirdly, when the comparator 2On compares the transmitted and received pseudorandom patterns, both signals can be easily synchronized, so the apparatus can be simplified and results with excellent reproducibility can be obtained.

Furthermore, as is clear from the electric circuit diagram shown in FIG. 2 above, the performance evaluation device can be configured by using the oscillator, demodulator, etc. that are inherent in the mobile station 10 and fixed station 20 that are the targets of performance evaluation. The mobile station 10 and fixed station 20 can be configured to be small and lightweight, providing excellent versatility and economic efficiency.

[Effects of the Invention] As explained above, the wireless communication performance evaluation device of the present invention transmits a pseudo-random pattern from either a fixed station or a mobile station, and transmits a pseudo-random pattern from the other mobile station or fixed station that receives this signal. The transmitting signal is received and sent back as is, and the outgoing signal and the returned signal are compared to evaluate the performance of wireless communication.

Therefore, the performance of wireless communication performed between a fixed station and a mobile station moving with respect to the fixed station can be evaluated continuously, and in a wireless communication system where the relative position changes constantly. Even if there is a problem, it is possible to accurately, accurately and reliably evaluate its performance.

Furthermore, since a pseudo-random pattern is used as a communication signal, it is possible to perform a performance evaluation close to that of an actual line, and it is also possible to easily compare signals and make the device smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the basic configuration of the present invention, FIG. 2 is an electric circuit diagram of a fixed station and a mobile station to which a wireless communication performance evaluation device of the embodiment is added, and FIG. 3 is a fixed diagram of the same embodiment. This shows a flowchart of the performance evaluation process of wireless communication (prediction) executed between the station and the mobile station. M, 10... Mobile station N, 20... Fixed station C1... Transmitting means C2.・Reply method C
3... Comparison means 10a... First receiving antenna 10c... Demodulator 1
0d...Logic circuit 10e...Second receiving antenna 10g...Reply antenna 20a...Signal transmitting antenna 20b...Carrier wave transmitting antenna 20c...Reply information receiving antenna 2Of...Switcher 20g...・Pseudo-random pattern generator 2On・・
・Comparator 30... Controller agent
Patent attorney Tsutomu Sadatsu (and 2 others) Figure 1

Claims (1)

[Claims] 1. In a wireless communication performance evaluation device that evaluates the performance of wireless communication performed between a fixed station installed at a predetermined location and a mobile station moving relative to the fixed station. , provided in either the fixed station or the mobile station,
A transmitting means for transmitting a pseudo-random pattern, and a transmitting means provided in the other fixed station or mobile station where the transmitting means is not provided, and receiving the pseudo-random pattern transmitted by the transmitting means and transmitting the received pseudo-random pattern again. a reply means for transmitting a message; and a reply means provided in the one fixed station or mobile station where the transmitter is provided, for receiving the pseudo-random pattern transmitted by the reply means, and for receiving the pseudo-random pattern transmitted by the received pseudo-random pattern and the transmitter transmitted by the transmitter. A wireless communication performance evaluation device comprising: a comparison means for comparing a pseudorandom pattern;