JP3204213B2 - Wireless communication device and mobile wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication apparatus for measuring a transmission path distance and a mobile radio communication system, for example, estimating a transmission path distance when a base station and a mobile station perform radio communication. The present invention relates to a base station and a mobile radio communication system.

[0002]

2. Description of the Related Art A mobile radio communication system includes a base station,
It is composed of a plurality of mobile stations that perform wireless communication with the base station. The mobile station can perform radio communication with the base station while moving within the radio coverage area of the base station,
For example, as a conventional mobile station, a mobile phone or a PHS (Pers
onal Handyphone System). In general, a plurality of base stations are installed while overlapping a part of the radio wave coverage area, and the base stations are arranged so that the radio wave coverage area from each base station covers the entire service area. I have. Therefore, by performing the handover, the mobile station can wirelessly communicate with any of the base stations regardless of where the mobile station moves in the service area.

[0003] In handover, a base station or a mobile station detects a reception level, which is the power intensity of a signal received from a communication partner station, and when the reception level is lower than a predetermined value, the transmission path distance between the two stations is reduced. It is determined that the mobile station is far, and the mobile station stops wireless communication with the current base station and newly starts wireless communication with another base station having a higher reception level.

Therefore, it is necessary for the base station and the mobile station to periodically measure the reception level of the communication partner station.
However, it goes without saying that measuring such a reception level consumes power. Basically, when the distance between the base station and the mobile station is short, there is no need for handover because the reception level is high, and measurement of the reception level results in wasteful operation and wasteful power consumption.

That is, if the distance between a base station and a mobile station during wireless communication can be measured, the number of times of measurement of the reception level can be minimized, the power consumption can be suppressed, and the mobile station can be used continuously. It is possible to extend the time. For example, as a conventional wireless communication system for measuring the distance between a base station and a mobile station, there is a wireless communication system described in Japanese Patent Application Laid-Open No. 7-226976.

FIG. 7 is a conceptual diagram showing the operation principle of the above-mentioned conventional radio communication system. FIG. 7 shows that the mobile station transmits the transmission burst signal TX-B of the base station to the reception burst signal RX-M.
And the base station receives the transmission burst signal TX-M of the mobile station as the reception burst signal RX-B. TD that divides one frequency into units called slots and assigns each slot to a plurality of users
In a wireless communication system of the MA system (Time Division Multiple Access system), a predetermined time of a timing difference T between a reception position and a transmission position is always defined.

Therefore, the transmission burst signal T of the base station is
When the time difference from X-B to the reception burst signal RX-M of the mobile station is d1, and the time difference from the transmission burst signal TX-M of the mobile station to the reception burst signal RX-B of the base station is d2, the sum is: The time T + τ obtained by adding a certain total time difference τ (= d1 + d2) to the specified time T is the time from the transmission burst signal TX-B to the reception burst signal RX-B in the base station. In the base station, it can be determined that the larger the total time difference τ is, the farther the mobile station is located.

FIG. 8 is a block diagram schematically showing a configuration of a base station of the conventional radio communication system. In FIG. 8, 1 is a unique word (hereinafter referred to as UW).
Is a UW generator. UW is information on a known data pattern used to detect the position of a burst signal in a TDMA wireless communication system. Reference numeral 2 denotes a preamble generator that generates a preamble. The preamble is 1 when demodulating the received signal.
This is information on a known data pattern used to generate the timing for determining / 0.

A data synthesizer 3 adds the UW and the preamble to the transmission user data to generate a transmission burst signal. Reference numeral 4 denotes a buffer for accumulating a reception burst signal and outputting reception user data based on a UW detection position. Reference numeral 5 denotes a UW detector that detects UW from the received burst signal stored in the buffer 4. Reference numeral 6 denotes a timer that measures the time from the generation of UW by the UW generator 1 to the detection of UW by the UW detector 5, and outputs delay time information according to the time. Reference numeral 7 denotes a timing generator that generates a timing for transmitting and receiving a burst signal, and determines the operation timing of each of the UW generator 1, the preamble generator 2, the data synthesizer 3, and the UW detector 5. Generate.

The operation will be described. When transmitting the burst signal, the timing generator 7 generates the UW generation timing, and when the UW generator 1 generates the UW, the UW generator 1 starts the timer 6 and starts measuring time. At the same time, the UW generated by the UW generator 1 and the preamble generated by the preamble generator 2 are input to the data synthesizer 3. In the data combiner 3, the UW generated by the UW generator 1 and the preamble generated by the preamble generator 2 are added to transmission user data to generate a transmission burst signal.

At the time of reception, the received burst signal is accumulated in the buffer 4 and the timing generator 7
The W detection timing is generated, and the UW detector 5 detects UW from the received burst signal. When UW is detected,
The timer 6 is stopped by the UW detector 5, the time measurement from the occurrence of UW to the detection of UW is completed, and the timer 6 outputs delay time information. On the other hand, received user data is extracted from the received burst signal from the buffer 4 based on the UW detection position and output.

As described above, according to the conventional radio communication system, the total time difference τ can be obtained by measuring the time (T + τ) from the occurrence of UW to the detection of UW in the base station, and the total time difference τ can be obtained. The distance between the base station and the mobile station can be measured from the transmission speed.

[0013]

However, the conventional wireless communication apparatus has a problem that it is inefficient in terms of battery saving. That is, in order to measure the transmission path distance, a timer is activated by the generation of UW in the transmission system as a trigger, and the timer is stopped by UW detection as a trigger. Therefore, it is necessary to operate the timer from transmission to reception. Was bad. For example, it was not possible to measure a transmission path distance by operating a timer only during reception.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can measure a transmission path distance.
It is an object of the present invention to obtain a wireless communication device and a mobile wireless communication system with good battery efficiency.

[0015]

According to the present invention, there is provided a radio communication apparatus for generating a signal for generating a transmission burst signal including a unique word having a predetermined known data pattern in a transmission state according to a transmission / reception state. Generate timing,
The reception state includes a timing generator that generates a signal decomposition timing for decomposing a received burst signal including a unique word composed of the predetermined known data pattern, based on the signal decomposition timing generated by the timing generator. An aperture generator that generates an aperture gate according to a time range for detecting the unique word included in the received burst signal, a time measuring device that outputs an elapsed time from a head position of the aperture gate, the aperture gate, The elapsed time is input, the unique word contained in the received burst signal is detected in the time range of the aperture gate, and the elapsed time from the head position of the aperture gate at the detected position is a transmission path distance during wireless communication. Output as transmission path distance information according to In which and a word detection unit.

Further, in the radio communication apparatus according to the next invention, the time measuring device is configured to count and output a clock generated in the symbol period as the elapsed time.

Further, in the wireless communication apparatus according to the next invention, the unique word detecting section sequentially obtains a correlation value with the known data pattern of the unique word at a predetermined interval position of the received burst signal, and A UW detector that outputs the correlation value at the detection position, and a maximum correlation value detector that detects a detection position having the highest correlation value from the plurality of detection positions as a true unique word detection position.

Further, in a mobile radio communication system according to the next invention, a signal generation for generating a transmission burst signal including a unique word having a predetermined known data pattern in a transmission state according to a transmission / reception state. A timing generator that generates timing and generates a signal decomposition timing for decomposing a reception burst signal including a unique word having the predetermined known data pattern in a reception state; and the signal generated by the timing generator. An aperture generator that generates an aperture gate according to a time range for detecting the unique word included in the received burst signal based on the decomposition timing, and a time measuring device that outputs an elapsed time from a head position of the aperture gate. , The aperture gate and the elapsed time are input, and the aperture The unique word contained in the received burst signal is detected in the time range of the gate, and the elapsed time from the head position of the aperture gate at the detection position is output as transmission path distance information corresponding to the transmission path distance during wireless communication. And at least one wireless communication device having a unique word detection unit for performing wireless communication between a plurality of wireless communication devices.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a TDMA mobile radio communication system according to one embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a base station that measures a transmission path distance during wireless communication, measures a reception level based on the transmission path distance information, and notifies the mobile station of control information for handover processing. Reference numeral 30 denotes a mobile station that performs radio communication with the base station 10 while moving within the radio coverage area of the base station 10 and performs a handover process according to the control information of the handover process notified from the base station 10. . Although one base station and one mobile station are shown in FIG. 1, a plurality of base stations and mobile stations exist in the service area of the mobile radio communication system.

Reference numeral 11 denotes a timing generator for generating a signal generation timing and a signal decomposition timing in accordance with a transmission / reception state.
A signal generation timing for generating a transmission burst signal is generated in the transmission state, and a signal decomposition timing for decomposing the reception burst signal is generated in the reception state.

Numeral 12 denotes a signal generation timing generated by the timing generator 11, which is a burst generator for generating a transmission burst signal by adding information such as preamble and UW to transmission user data which is user transmission data. is there. Note that the burst signal is a 1/0 digital signal created according to a data format defined in advance. The preamble is information of a known data pattern used to generate a timing for determining 1/0 when demodulating a received signal. Also, U
W is information of a known data pattern used to detect the position of a burst signal in a TDMA mobile radio communication system.

FIG. 2 shows an example showing the concept of the configuration of the burst signal used in the TDMA system. As described above, the data format of the burst signal is defined in advance as shown in FIG. Therefore, the head position H of the burst signal can be detected by returning N symbols before the UW detection position P.

Reference numeral 13 denotes a modulator for modulating the transmission burst signal, which converts a transmission burst signal composed of a 1/0 digital signal into phase information and amplitude information of a transmission wave. 14
Is a synthesizer that supplies a frequency signal used for up-conversion or down-conversion. Fifteen
Is an RF transmitter that receives a frequency signal supplied from the synthesizer 14 as an input, and up-converts a transmission burst signal modulated by the modulator 13 into a radio frequency band wave.

The transmitter 17 transmits the transmission burst signal up-converted by the RF transmitter 15 to the mobile station 30 as a transmission signal during transmission, and uses the reception burst signal as a radio signal from the mobile station 30 as a reception signal during reception. This is the receiving antenna. The antenna 18 receives the frequency signal supplied from the synthesizer 14 as an input, and
7, the received burst signal in the radio frequency band is down-converted into a baseband signal band, and the reception level, which is the power level of the received signal, is measured based on transmission path distance information corresponding to the transmission path distance during wireless communication. RF receiver.

Reference numeral 16 denotes a switch for judging a state based on the timing generated by the timing generator 11 and switching the control. In the transmission state, the RF transmitter 1
5 and the antenna 17 are connected.
7 and the RF receiver 18 are connected.

Reference numeral 19 denotes an A / D converter which samples the received burst signal in the baseband signal band, converts the sampled signal into a 1/0 digital signal, and outputs a received burst signal expressed with a predetermined resolution. Here, a received burst signal expressed with an 8-bit resolution is output. 20
Detects the UW from the received burst signal converted into the digital signal of 8-bit resolution by the A / D converter 19 and transmits the transmission path distance information corresponding to the transmission path distance during wireless communication to the RF receiver 18. And the received burst signal is demodulated to 1/0 1-bit, and the preamble and U
This is a burst demodulator / decomposer that decomposes into W and the like and received user data that is user's received data and outputs only received user data that is user's received data.

FIG. 3 is a block diagram showing the configuration of the burst demodulator / decomposer 20 in detail. In FIG. 3, 2
Reference numeral 1 denotes a buffer for storing a received burst signal output from the A / D converter 19 and represented by an 8-bit resolution. Reference numeral 22 denotes an aperture generator that generates an aperture gate corresponding to a time range for detecting UW based on the signal decomposition timing generated by the timing generator 11.

For example, the aperture gate performs signal decomposition timing generated by the timing generator 11 according to a data format of a burst signal defined in advance as shown in FIG. 2, that is, reception of the base station shown in FIG. Based on the signal decomposition timing of the burst signal RX-B, UW when the received burst signal is received with the maximum delay time from the UW position when received with the delay time 0
Set to the time range to the position.

Reference numeral 23 denotes a time measuring device for outputting the elapsed time from the head position of the aperture gate generated by the aperture generator 22. In this case, the aperture generator 2
2 is a clock generator that starts upon detecting the generation of the aperture gate 2 and counts and outputs a clock generated in a symbol period.

Reference numeral 24 denotes an input of an aperture gate generated by the aperture generator 22 and a clock output from the clock generator 23, and a data pattern of a received burst signal at a predetermined interval position in the time range of the aperture gate. The correlation value between the UW and the known data pattern is sequentially calculated, and the UW included in the received burst signal is calculated.
Is a UW detector for detecting the
When it is higher than the detection threshold, it is determined that the UW has been detected, and the position information at the UW detection position, the correlation value, and the number of clocks according to the elapsed time from the head position of the aperture gate are output.

Numeral 25 denotes a maximum correlation value detector for detecting the highest correlation value from a plurality of UW detection positions output from the UW detector 24, and the position information of the UW detection position having the highest correlation value and Outputs the number of clocks. This number of clocks is output to the RF receiver 18 as transmission path distance information corresponding to the transmission path distance during wireless communication. Here, the number of clocks corresponds to the elapsed time from the UW position when the received burst signal is received with delay time 0 to the position where UW is actually detected. The transmission path distance can be obtained by integrating the reciprocal of the above and the propagation speed of the radio wave.

Further, in the present embodiment, the UW detector comprises a UW detector 24 and a maximum correlation value detector 25.

A UW 26 extracts a UW from the received burst signal stored in the buffer 21 based on the position information output from the maximum correlation value detector 25, detects a signal distortion state, and detects the distortion state. The adaptive equalizer demodulates the received burst signal into a 1-bit signal in response.

Reference numeral 27 denotes a decomposer which decomposes the received burst signal demodulated to 1 bit into preambles, UWs and the like, and received user data which is received data of the user, and outputs only received user data.

The operation will be described with reference to FIGS. When a burst signal is transmitted from the base station 10 to the mobile station 30, the burst generator 12 transmits UW and preamble to transmission user data, which is transmission data of a user, according to the signal generation timing generated by the timing generator 11. Is added to generate a transmission burst signal. The transmission burst signal is modulated by the modulator 13 and then up-converted by the RF transmitter 15 to a radio frequency band according to the frequency signal supplied from the synthesizer 14.

At this time, the switch 16 switches the RF transmitter 15 based on the timing generated by the timing generator 11.
And the antenna 17 are connected, and the transmission burst signal up-converted to the radio frequency band is:
After passing through the switch 16, the mobile station 3
Sent to 0.

Thus, the base station 10 can generate a burst signal and transmit it to the mobile station 30. For example, the base station 10 generates a transmission burst signal from transmission data of a user of another mobile station (not shown) and transmits it to the mobile station 30 so that the user data of the another mobile station is transmitted to the mobile station 30. Can be sent. Further, for example, when the base station 10 is connected to a telephone network, a transmission burst signal is generated from transmission data transmitted from an ordinary telephone user via an exchange, and the transmission burst signal is transmitted to the mobile station 30. , The normal telephone user data can be transmitted to the mobile station 30.

Next, when the base station 10 receives a burst signal, for example, the burst signal transmitted from the mobile station 30 is received by the antenna 17. At this time, the switch 16 is in a state where the antenna 17 and the RF receiver 18 are connected based on the timing generated by the timing generator 11, and the received burst signal is
6 and input to the RF receiver 18.

Then, in the RF receiver 18, the received burst signal is down-converted from a radio frequency band to a baseband signal band according to the frequency signal supplied from the synthesizer 14. Then, the down-converted received burst signal is sampled at the A / D converter 19 at, for example, the same sampling rate as the transmission rate, and is converted into a 1/0 digital signal expressed with an 8-bit resolution. .

Further, when input to the burst demodulator / decomposer 20, the received burst signal is accumulated in the buffer 21, and the UW detector 24 detects UW.

FIG. 4 is a conceptual diagram showing an aperture gate and a UW detection position. In the UW detector 24, in the time range of the aperture gate generated by the aperture generator 22 (a convex portion of the aperture gate in the figure), the data pattern of the received burst signal at a predetermined interval position from the head position of the aperture gate and the UW known signal are used. Correlation values with the data pattern are sequentially obtained, and UW is detected based on the correlation value. Since the received burst signal is distorted depending on the state of the transmission path, a predetermined U
If the correlation value is higher than the W detection threshold, it is determined that UW has been detected.

For example, of a plurality of UW detection pulses generated when a correlation value is obtained by the UW detector 24,
Since the correlation value co1 of the W detection pulse UD1 and the correlation value co2 of the UW detection pulse UD2 are larger than the UW detection threshold, it is determined that UW has been detected. UW detection pulse U
Since the correlation value co3 of D3 is smaller than the UW detection threshold value, it is determined that UW has not been detected.

Then, the position information corresponding to the UW detection pulse UD1 and the UW detection pulse UD2, the correlation value (co1,
co2) and the number of clocks (ck1, ck2) corresponding to the elapsed time from the head position of the aperture gate are output to the maximum correlation value detector 25. When the time range of the aperture gate ends, the clock generator 23 stops.

Then, in the maximum correlation value detector 25,
The highest correlation value is detected from a plurality of UW detection positions, and position information of the UW detection position is output to the adaptive equalizer 26. The number of clocks at the UW detection position is output to the RF receiver 18 as transmission path distance information corresponding to the transmission path distance during wireless communication. In this case, the maximum correlation value detector 2
5, the UW detection pulse UD1 and the UW detection pulse U
Out of D2, a UW detection pulse UD2 having a high correlation value is detected, and its position information is output to adaptive equalizer 26. Further, the clock number ck2 is output to the RF receiver 18 as transmission path distance information corresponding to the transmission path distance during wireless communication.

As described above, the transmission path distance can be measured more accurately by determining the one having the highest correlation value from the plurality of UW detection positions as the true UW detection position.
For example, in a high-speed mobile radio communication system for transmitting and receiving large amounts of data mainly in multimedia services, a shorter symbol length causes a relatively longer delay, and a delayed wave exceeding a symbol is generated. . Since the direct wave and the delayed wave interfere with each other to cause distortion in the signal waveform, it is necessary to perform demodulation using an adaptive equalizer. However, UW detection is required to operate the adaptive equalizer, that is, UW detection is performed before demodulation. For this reason, the UW detection accuracy is reduced, and the UW detection threshold must be set low.

Further, for example, a direct wave does not arrive because it is blocked by an obstruction, and only some delayed waves arrive. Even if the linear distance between the base station and the mobile station is short, the transmission path distance is the transmission path of the delayed wave. May need to be adopted.

For example, in FIG. 4, the UW of the direct wave is U
When the UW of the delayed wave is detected by the UW detection pulse UD2, the UW detection pulse UD is detected.
Let 2 be a true UW detection position. In a system with a signal transmission rate of 30 M symbols / S, the UW detection pulse UD1
Assuming that the elapsed time between the UW detection pulse UD2 and the UW detection pulse UD2 is 8 symbols, the equation (1) indicates that the absolute elapsed time is 266 ns.

[0048]

(Equation 1)

This means that the propagation speed of the radio wave is 3e + 8 m / s.
Is equivalent to a distance difference of 80 m according to equation (2).

[0050]

(Equation 2)

That is, when UD1 is regarded as a true UW detection position and UD2 is regarded as a true UW detection position, a distance difference of 80 m occurs, but the correlation value is the highest. By judging the object as a true UW detection position, the transmission path distance can be accurately measured according to the state of the transmission path. The situation where a plurality of UWs are detected occurs because the UW detection threshold is set low as described above.

When the position information of the UW detection position having the highest correlation value is output from the maximum correlation value detector 25 to the adaptive equalizer 26, the adaptive equalizer 26 performs the above-mentioned operation based on the position information. The UW is extracted from the received burst signal stored in the buffer 21, and the distortion state of the signal is detected by comparison with the UW known data pattern. Further, each distortion pattern of the 1/0 signal is learned using the distortion state, and the received burst signal including the preamble, the UW, and the received user data is demodulated into a 1-bit signal using the learning result.

The received burst signal demodulated into a 1-bit signal is decomposed by a decomposer 27 into a preamble, UW, and the like, and received user data that is user received data, and only the received user data is output.

On the other hand, the RF receiver 18 measures the reception level based on the transmission path distance information (the number of clocks) input from the burst demodulator / decomposer 20. For example, when the transmission path distance information is larger than a predetermined threshold, the transmission path distance is long, and there is a possibility that a handover process is required, so that the reception level is measured. When the transmission path distance information is smaller than a predetermined threshold value, the transmission path distance is short and there is no need for a handover process, so that the reception level is not measured. Further, the above R
As a result of the measurement of the reception level by the F receiver 18, when the reception level is extremely low and the handover process is required, the control information of the handover process is notified to the mobile station 30 in communication, The mobile station 30 performs a handover process. In the above example, U
In the case of D1, it is judged that the distance is short.
By setting 2 as the true position, the transmission path distance is determined to be long,
This will require a reception level measurement.

In this way, the burst signal from the mobile station 30 can be received, and the received user data can be extracted from the received burst signal. Can be measured, and the number of reception level measurements can be minimized according to the measurement result. Furthermore, the mobile station 30 can also perform the handover process only when the transmission path distance is long, based on the notification from the base station 10.

As described above, according to the present embodiment, the number of clocks corresponding to the elapsed time from the head position of the aperture gate to the position where UW is actually detected is measured by using the clock generator. By operating the clock generator of the base station at the time of reception of the base station, the transmission path distance between the base station and the mobile station during wireless communication can be measured, and a base station and a mobile wireless communication system with good battery efficiency can be provided. Obtainable.

Further, among a plurality of UW detection positions detected in the time range of the aperture gate, a position having the highest correlation value is determined as a true UW detection position, so that a mobile radio communication having a very high transmission speed is performed. Also in the system, it is possible to obtain a base station and a mobile radio communication system that can more accurately measure the transmission path distance.

Further, by measuring the reception level based on the transmission path distance measured only by the reception system of the base station, the number of times of measurement of the reception level can be minimized and the power consumption can be suppressed. Base station and a mobile radio communication system capable of performing the above operations.

Further, the reception level is measured by the base station based on the transmission path distance measured only by the reception system of the base station, and a handover process is performed by the mobile station according to the result. It is possible to obtain a mobile station and a mobile radio communication system in which the number of times of processing and reception level measurement can be kept to a minimum and power consumption can be suppressed.

In this embodiment, the mobile radio communication system of the TDMA system has been described. However, any mobile radio communication system using UW may be used, and the present invention is not limited to this. UW may be any known data pattern.

Also, a case has been described where the base station measures the transmission path distance, measures the reception level based on the transmission path distance information, and notifies the mobile station of the control information of the handover process. However, the present invention is not limited to this. Not something. For example,
The base station may notify the mobile station of the transmission path distance, and the mobile station may determine whether the reception level measurement and the handover process are necessary. As a result, processing related to handover can be distributed to mobile stations, and processing can be prevented from being concentrated on the base station.

Further, the configuration of the mobile station may be the same as that of the base station of the present embodiment, and the transmission path distance may be measured by the mobile station. Normally, the state of the transmission path from the mobile station to the base station is different from the state of the transmission path from the base station to the mobile station.
This makes it possible to more accurately determine the necessity of the handover process of the mobile station and prevent the process from being concentrated on the base station.

Although the mobile radio communication system in which the base station and the mobile station perform radio communication has been described, the present invention can be applied to a mobile radio communication system such as a transceiver system in which mobile stations perform radio communication. The same effect as in the embodiment can be obtained. In this case, one of the mobile stations is configured as a base station of the present embodiment,
Used as a pseudo base station.

Embodiment 2 In the above-described embodiment, the clock generator is used as the time measuring device, and the transmission line distance is represented by the number of symbol clocks. Next, the timer is used as the time measuring device, and the transmission line distance is represented by the timer value. An embodiment will be described. FIG. 5 is a block diagram showing the configuration of the burst demodulator / decomposer 20 in such a case. The same reference numerals are given to the same or corresponding parts as in the above-described embodiment, and the description is omitted. Reference numeral 28 denotes a timer which detects and starts the generation of the aperture gate of the aperture generator 22 and always notifies the UW detector 24 of a time value corresponding to the elapsed time from the head position of the aperture gate.

The operation of the burst demodulator / decomposer 20 at the time of reception will be described. The other operations are the same as those in the above-described embodiment, and thus the description will be omitted.

In the burst demodulator / decomposer 20, when a received burst signal of a 1/0 digital signal represented by an 8-bit resolution is input, the received burst signal is accumulated in the buffer 21 and the UW detector 24 detects the UW. Is detected.

First, when an aperture gate is generated by the aperture generator 22, this is detected and a timer 28 is started, and a timer value corresponding to the elapsed time from the head position of the aperture gate is notified to the UW detector 24. Begin to be. UW
The detector 24 receives the timer value and calculates the correlation value between the data pattern of the received burst signal and the UW known data pattern in accordance with the aperture gate generated by the aperture generator 22. Is done. Timer 2 when aperture gate time range expires
8 stops.

Then, position information corresponding to the UW detection position,
A timer value corresponding to the correlation value and the elapsed time from the head position of the aperture gate is output to the maximum correlation value detector 25. Then, in the maximum correlation value detector 25, a plurality of U
The highest correlation value is detected from the W detection positions, and the position information of the UW detection position is output to the adaptive equalizer 26. As transmission path distance information corresponding to the transmission path distance during wireless communication, the timer value at the UW detection position is set to the RF receiver 18.
Is output to

Then, similarly to the above-described embodiment, the adaptive burst equalizer 26 demodulates the received burst signal stored in the buffer 21 into a 1-bit signal based on the position information. , Preamble, U
It is decomposed into W and the like and received user data which is received data of the user, and only the received user data is output.

As in the above-described embodiment, the RF receiver 18 measures the reception level based on the transmission path distance information (timer value) input from the burst demodulator / decomposer 20. As a result, when the reception level is very low and the handover process is required, the control information of the handover process is notified to the mobile station 30 in communication, and the mobile station 30 performs the handover process according to the notification.

As described above, according to the present embodiment, the base station measures the time value corresponding to the elapsed time from the head position of the aperture gate to the position where UW is actually detected by using the timer. By simply operating the timer at the time of reception by the base station, the transmission path distance between the base station and the mobile station during wireless communication can be measured, and a base station and a mobile wireless communication system with good battery efficiency can be obtained. .

Further, by measuring the reception level based on the transmission path distance measured only by the reception system of the base station, the number of times of measurement of the reception level can be minimized, and the power consumption can be suppressed. Base station and a mobile radio communication system capable of performing the above operations.

Also, the reception level is measured at the base station based on the transmission path distance measured only at the reception system of the base station, and the mobile station performs a handover process according to the result. It is possible to obtain a mobile station and a mobile radio communication system in which the number of times of processing and reception level measurement can be kept to a minimum and power consumption can be suppressed.

In this embodiment, in the mobile radio communication system of the TDMA system, the base station measures the transmission path distance, measures the reception level based on the transmission path distance information, and performs handover processing to the mobile station. Has been described, but the present invention is not limited to this. As in the above embodiment, the base station may notify the mobile station of the transmission path distance, and the mobile station may determine whether the reception level measurement and the handover process are necessary. Also,
The configuration of the mobile station may be the same as the base station of the present embodiment, and the mobile station may measure the transmission path distance. Furthermore, it goes without saying that a mobile radio communication system in which mobile stations perform radio communication with each other may be used.

Embodiment 3 In the above-described embodiment, a high-speed mobile radio communication system having a very high transmission rate has been described. Next, an embodiment of a low-speed mobile radio communication system according to the present invention will be described. FIG. 6 is a block diagram showing a configuration of the burst demodulator / decomposer 20 in such a case. The same reference numerals are given to the same or corresponding parts as in the above-described embodiment, and the description is omitted.

Reference numeral 29 denotes a demodulator for demodulating a received burst signal output from the A / D converter 19 and represented by 8-bit resolution into a 1-bit signal. In low-speed wireless communication, signal distortion is usually smaller than that in high-speed wireless communication. Therefore, a demodulator 29 is provided before the UW detector 24 without using the adaptive equalizer 26 as in the above-described embodiment.

The maximum correlation value detector 25 detects the highest correlation value from a plurality of UW detection positions output from the UW detector 24, and decomposes the position information of the UW detection position having the highest correlation value. And outputs the clock number at the UW detection position having the highest correlation value to the RF receiver 18.

The operation of the burst demodulator / decomposer 20 at the time of reception will be described. The other operations are the same as those in the above-described embodiment, and thus the description will be omitted.

In the burst demodulator / decomposer 20, when a received burst signal of a 1/0 digital signal represented by an 8-bit resolution is input, the demodulator 29 demodulates the received burst signal into a 1-bit signal, and then a buffer. 21 and U
UW is detected by the W detector 24.

The operation of UW detection is the same as in the above-described embodiment. When an aperture gate is generated by the aperture generator 22, this is detected, a timer 28 is started, and the UW detector 24 moves to the UW detection position. The corresponding position information, the correlation value, and the timer value according to the elapsed time from the head position of the aperture gate are output to the maximum correlation value detector 25.

Then, in the maximum correlation value detector 25,
The highest correlation value is detected from the plurality of UW detection positions, and the position information of the UW detection position is output to the decomposer 27. In the decomposer 27, the preamble, UW, etc. It is decomposed into data and only the received user data is output.

Further, a timer value of the UW detection position is output to the RF receiver 18 as transmission path distance information corresponding to the transmission path distance during wireless communication.
In the receiver 18, the reception level is measured based on the transmission path distance information (timer value) input from the burst demodulator / decomposer 20. As a result, when the reception level is extremely low and the handover process is required, the control information of the handover process is notified to the mobile station 30 during communication,
The mobile station 30 performs a handover process according to the notification.

As described above, according to the present embodiment, the timer is operated after demodulating the received burst signal into a 1-bit signal, and the UW is actually started from the head position of the aperture gate.
By using a timer to measure the time value corresponding to the elapsed time up to the position where the base station is detected, the base station timer is operated only when the base station receives the signal, and the transmission between the base station and the mobile station during wireless communication The road distance can be measured, and a base station and a mobile radio communication system with good battery efficiency can be obtained.

Further, by measuring the reception level based on the transmission path distance measured only by the reception system of the base station, the number of times of measurement of the reception level can be minimized and the power consumption can be suppressed. Base station and a mobile radio communication system capable of performing the above operations.

Further, the reception level is measured by the base station based on the transmission path distance measured only by the reception system of the base station, and the mobile station performs the handover process according to the result. It is possible to obtain a mobile station and a mobile radio communication system in which the number of times of processing and reception level measurement can be kept to a minimum and power consumption can be suppressed.

In the present embodiment, the case where the time value according to the elapsed time from the head position of the aperture gate to the position where UW is actually detected has been described, but the present invention is not limited to this. Absent. Even if a clock generator is provided instead of the timer and the number of clocks according to the elapsed time is measured, the same effect as in the present embodiment can be obtained.

In a mobile radio communication system of the TDMA system, a base station measures a transmission path distance, measures a reception level based on the transmission path distance information, and notifies the mobile station of control information for handover processing. Although the case has been described, the present invention is not limited to this. As in the previous embodiment, the base station notifies the mobile station of the transmission path distance,
The mobile station may determine whether the reception level measurement and the handover process are necessary. Further, the configuration of the mobile station may be the same as that of the base station according to the present embodiment, and the mobile station may measure the transmission path distance. Furthermore, it goes without saying that a mobile radio communication system in which mobile stations perform radio communication with each other may be used.

[0088]

As described above, according to the present invention, the elapsed time from the head position of the aperture gate to the UW detection position according to the time range for detecting the UW from the received burst signal is measured using the time measuring device. Thus, the transmission path distance during wireless communication can be measured only by operating the time measuring device at the time of reception, and a wireless communication device with high battery efficiency can be obtained.

Further, according to the next invention, the clock which generates the elapsed time from the head position of the aperture gate to the UW detection position according to the time range for detecting the UW from the received burst signal in the symbol period is counted. Thus, the transmission path distance during wireless communication can be measured only by operating the time measuring device for counting the symbol clock at the time of reception, and a wireless communication device with good battery efficiency can be obtained.

According to the next invention, among the plurality of UW detection positions detected in the time range of the aperture gate,
A radio communication device capable of more accurately measuring a transmission path distance even in a mobile radio communication system having a very high transmission speed by setting a detection position having the highest correlation value as a true UW detection position. Can be.

Further, according to the next invention, the elapsed time from the head position of the aperture gate to the UW detection position according to the time range for detecting the UW from the received burst signal is measured using a time measuring device. By providing at least one wireless communication device, when performing wireless communication between a plurality of the wireless communication devices, it is possible to measure a transmission path distance during wireless communication simply by operating a time measuring device at the time of reception. As a result, a mobile radio communication system with good battery efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mobile radio communication system according to Embodiment 1 of the present invention.

FIG. 2 is a conceptual diagram showing an example of a configuration of a burst signal.

FIG. 3 is a diagram illustrating burst demodulation / transmission according to Embodiment 1 of the present invention.
It is a block diagram which shows the structure of a decomposer.

FIG. 4 is a conceptual diagram showing an aperture gate and a UW detection position.

FIG. 5 is a diagram illustrating burst demodulation / transmission according to Embodiment 2 of the present invention.
It is a block diagram which shows the structure of a decomposer.

FIG. 6 is a diagram illustrating burst demodulation / modulation according to Embodiment 3 of the present invention.
It is a block diagram which shows the structure of a decomposer.

FIG. 7 is a conceptual diagram showing the operation principle of a conventional wireless communication system.

FIG. 8 is a block diagram illustrating a configuration of a base station of a conventional wireless communication system.

[Explanation of symbols]

Reference Signs List 1 UW generator 2 Preamble generator 3 Data combiner 4, 21 buffer 5, 24 UW detector 6, 28 Timer 7, 11 Timing generator 10 Base station 12 Burst generator 13 Modulator 14 Synthesizer 15 RF transmitter 16 Switch Reference Signs List 17 antenna 18 RF receiver 19 A / D converter 20 burst demodulator / decomposer 22 aperture generator 23 clock generator 25 maximum correlation value detector 26 adaptive equalizer 27 decomposer 29 demodulator 30 mobile station

Continuation of the front page (56) References JP-A-7-226976 (JP, A) JP-A-5-252128 (JP, A) JP-A 8-56218 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) H04B ^7/ 24-7/26 102 H04Q ^7/ 00-7/38

Claims (4)

(57) [Claims] 1. A signal generation timing for generating a transmission burst signal including a unique word having a predetermined known data pattern is generated in a transmission state according to a transmission / reception state, and the predetermined known timing is generated in a reception state. A timing generator for generating a signal decomposition timing for decomposing a received burst signal including a unique word composed of a data pattern; and the timing generator included in the received burst signal based on the signal decomposition timing generated by the timing generator. An aperture generator that generates an aperture gate according to a time range for detecting a unique word, a time measuring device that outputs an elapsed time from a head position of the aperture gate, an input of the aperture gate and the elapsed time, Included in the received burst signal within the aperture gate time range A unique word detection unit that detects the unique word and outputs the elapsed time from the head position of the aperture gate at the detection position as transmission path distance information according to the transmission path distance during wireless communication. Wireless communication device. 2. The wireless communication device according to claim 1, wherein the time measuring device is configured to count and output a clock generated in a symbol period as the elapsed time. 3. The unique word detecting section sequentially obtains a correlation value between a known data pattern of the unique word at a predetermined interval position of the received burst signal and outputs a plurality of detection positions and the correlation value at the detection positions. The wireless communication according to claim 1, further comprising: a UW detector that performs detection, and a maximum correlation value detector that detects a detection position having the highest correlation value from the plurality of detection positions as a true unique word detection position. apparatus. 4. A signal generation timing for generating a transmission burst signal including a unique word having a predetermined known data pattern is generated in a transmission state according to a transmission / reception state, and the predetermined known timing is generated in a reception state. A timing generator for generating a signal decomposition timing for decomposing a received burst signal including a unique word composed of a data pattern; and the timing generator included in the received burst signal based on the signal decomposition timing generated by the timing generator. An aperture generator that generates an aperture gate according to a time range for detecting a unique word, a time measuring device that outputs an elapsed time from a head position of the aperture gate, an input of the aperture gate and the elapsed time, Included in the received burst signal within the aperture gate time range A unique word detection unit that detects the unique word and outputs the elapsed time from the head position of the aperture gate at the detection position as transmission path distance information according to the transmission path distance during wireless communication. A mobile radio communication system comprising at least one device and performing radio communication between a plurality of radio communication devices.