JPH09331310A - Diversity receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the diversity receiver in which adverse effect by a disturbing (U) wave is reduced. SOLUTION: A radio wave received by antennas 11-1N is fed to detection sections 21-2N, in which the radio wave is detected and reception electric field level (RSSI) is measured. Demodulation information as a result of the detection by the detection sections 21-2N is outputted to a diversity processing section 100 and the RSSI information measured by the detection sections 21-2N is outputted to A/D converter sections 31-3N. Based on two point timing in burst timing points outputted from a timing instruction section 300, the A/D converter sections 31-3N apply A/D-conversion to the timing of two points, calculation sections 41-4N obtain a change amount of the RSSI information in both the timing signals and discrimination sections 51-5N compare the change in the RSSI information with a leading threshold level to discriminate whether or not the radio wave is a disturbing wave. The discrimination sections 51-5N invalidate the input of demodulation information of the received wave of a branch discriminated to be a disturbing wave.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diversity receiver, and more particularly to a radio apparatus for performing diversity reception in the communication field, and more particularly to a radio apparatus for performing TDMA (Time Division Multiple Access) transmission / reception.

[0002]

2. Description of the Related Art FIG. 13 shows the structure of a general diversity receiver. As shown in FIG. 13, a plurality of antennas 11 and 12 to 1N for receiving an incoming radio wave,
Each branch 1, 2 to N is configured by a plurality of detection units 21, 22 to 2N which detect the corresponding reception electric field level (hereinafter referred to as “RSSI”) corresponding to each antenna 11, 12 to 1N. . Then, the conventional diversity receiver has the detection units 21 and 2 of the branches 1 to N.
The demodulation information and the RSSI information of the received wave obtained in 2 to 2N are sent to the diversity processing unit 100, the diversity processing unit 100 performs the diversity processing of the demodulation information based on the RSSI information, and the demodulation data subjected to the diversity processing. Is sent to the reception data processing unit 200, and the reception data processing unit 200 processes the reception data based on the demodulated data.

Next, the operation of the conventional diversity receiver shown in FIG. 13 will be described.

The electric waves received by the plurality of antennas 11 and 12 to 1N are detected by the detection unit 21 corresponding to each antenna.
The RSSI is measured while being detected at 22 to 2N. Then, the detected demodulation information and RSSI information are
From the detection units 21, 22 to 2N to the diversity processing unit 100
Then, the diversity processing unit 100 performs diversity processing based on the RSSI information of each branch 1, 2 to N. Here, the diversity processing, for example, validates only the demodulation information of the branch showing the maximum level among the RSSI information of all the branches 1, 2 to N, and the demodulation information of the branch whose RSSI does not reach a certain level. It is a process of obtaining the demodulation data by invalidating and weighting the demodulation information of each branch in proportion to the level of the RSSI information.

Then, the demodulated data subjected to the diversity processing is input to the received data processing section 200, where the received data is processed.

Therefore, according to the conventional diversity receiver, the received electric field level fluctuates due to fading or the like,
Even if the reception electric field levels of some branches drop, good reception sensitivity can be maintained, and stable reception data processing is possible. What is fading?
It means that the strength of a radio signal changes due to the interference of radio waves in different propagation paths or the change in the state of propagation paths.

[0007]

However, as shown in FIG.
In the conventional diversity receiver shown in FIG.
Even if the radio wave received by any of 12 to 1N is an interfering wave (hereinafter referred to as “U wave”), if the received electric field level of the U wave shows the maximum level, the diversity processing unit 100 ( In FIG. 13), the branch that received the U wave is prioritized, the demodulation information of that branch is validated, the demodulation information is processed, and output to the reception data processing unit 200 as demodulation data. For this reason,
Since the reception data processing unit 200 processes the U-wave demodulation data, an error may occur in the reception data.

That is, in the conventional diversity receiver, when any one of the plurality of antennas receives the U wave, the U wave may deteriorate the reception sensitivity.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a diversity receiver in which the adverse effect of U waves is reduced.

[0010]

In order to solve the above problems, the diversity receiver according to the present invention has the following features.

(1) A plurality of antennas for receiving incoming radio waves, a plurality of reception electric field level measuring units connected to the respective antennas for measuring the reception electric field level of the reception waves from the antennas, and the plurality of antennas A diversity processing unit that performs diversity processing based on the received wave and the received electric field level, and a change in the received electric field level that is received based on the output of the received electric field level measurement unit provided corresponding to each antenna is monitored. And a disturbance wave determining unit that determines whether or not the reception wave is an interference wave and invalidates the input of the reception wave that is determined to be the interference wave to the diversity processing unit.

The interference wave determination unit detects whether or not the received wave is an interference wave (U wave) for each antenna, and invalidates the input of the received wave determined to be the U wave to the diversity processing unit. , It is possible to prevent an error in received data due to U waves. Therefore, it is possible to prevent the reception sensitivity from being deteriorated by the interfering wave and reduce the adverse effect of the interfering wave.

(2) In the diversity receiver described in (1) above, the interfering wave determining section monitors the received electric field level at the head position of the received burst timing of the received wave.

That is, since the interfering wave determining unit can determine whether the received wave is an interfering wave or not based on the RSSI information at the start position of the received burst timing of the received wave, the U wave is received at the same time as the reception. I know if there is. Therefore, the diversity processing of the received wave with the U wave removed can be performed quickly.

(3) In the diversity receiver described in (2) above, there is further provided a rising threshold value setting section for setting a rising change threshold value of the received electric field level at the reception burst of the received wave, and the interfering wave judgment is made. The unit determines whether the received wave is an interfering wave based on the rising threshold value from the rising threshold value setting unit.

That is, the interfering wave determination unit compares the rising threshold value input from the rising threshold value setting unit with the magnitude of the RSSI rising change at the time of burst input of the received wave, and when the RSSI rising change is equal to or larger than the rising threshold value. Wave is judged as desired wave (hereinafter referred to as "D wave"), while RSS
A received wave whose rise change is less than the rise threshold is determined as an interfering wave (U wave). Therefore, if the rising threshold for U-wave determination is set to an optimum value according to the system, good reception sensitivity suitable for the system can be obtained.

(4) In the diversity receiver described in (2) or (3) above, further, there is a timing correction unit for varying the monitoring width of the received electric field level, and the timing correction unit once receives bursts. After the normal reception, the rise monitoring width is narrowed.

The diversity receiver described in (2) or (3) above determines that the desired wave (D wave) is detected when the rising edge is detected within the change monitoring width of the received electric field level (RSSI), and the above-mentioned monitoring is performed. If the rising edge is not detected within the width, it is determined to be a U wave. Normally, at the start of the reception operation, the accurate reception timing is not known, so the RSSI change monitoring width is set to be wider. On the other hand, the U wave is generally generated at an arbitrary timing. Therefore, even if it is a U wave, RS
If a rising edge is detected within the SI change monitoring width, D
It is judged as a wave and is mistakenly recognized. Therefore, once the burst input timing of the D wave is known (that is, after the burst is correctly received once), the probability of false detection can be reduced by narrowing the RSSI change monitoring width.

(5) In the diversity receiver described in (4) above, the timing correction section obtains the position of the next reception burst with reference to the position of the reception burst immediately before, and determines the position of the next reception burst. The position of the rising monitoring width is slide-corrected to include.

Normally, when the distance to the opposite radio device changes, the burst input timing also changes. Therefore, the U-wave can be accurately detected by correcting the position of the rising monitor width every time the normal reception is performed by the timing correction unit each time the normal reception is performed.

(6) In the diversity receiver described in (5) above, the timing correction section widens the rise monitoring width when a state in which reception is not possible continues for a predetermined time.

When a state in which reception with the opposite radio device is temporarily impossible continues, the accurate reception timing cannot be known, and it becomes impossible to monitor the rise of RSSI at the correct position. Therefore, the timing correction unit can detect the rising position of RSSI and correct the RSSI monitoring timing by widening the rising monitoring width when the unreceivable state continues for a predetermined time. Therefore, it is possible to reduce the possibility that the U-wave detection function will be adversely affected even when the reception state deteriorates.

(7) In the diversity receiver described in (1) above, the interference wave determination unit constantly monitors a change in the received electric field level of the received wave, and at the time of the monitoring, there is a change in the received electric field level. When it is equal to or more than the amount, it is determined that the received wave is an interference wave, and the input of the received wave is invalidated to the diversity processing unit.

This makes it possible to detect the U wave generated from the timing in the middle of the reception burst.
It is possible to reduce the adverse effects of reception due to waves.

(8) In the diversity receiver described in (1) above, the interfering wave determining section monitors the received electric field level at the tail position of the received burst timing of the received wave.

By monitoring the change in RSSI at the tail position of the reception burst timing (that is, the fall timing of the burst), even if the reception wave is not judged to be the U wave at the rise of the reception burst, it is detected as the U wave. Therefore, it is possible to reduce the adverse effect of reception due to the U wave.

(9) In the diversity receiver described in (1) above, there is further provided a known data information providing section for storing known received electric field level data, and the disturbance wave determining section provides the known data information providing section. The received electric field level fluctuation of the known received electric field level data read from the unit is compared with the received electric field level fluctuation of the received wave, and when the received electric field level fluctuation of the received wave is significantly different from the known received electric field level fluctuation, , The received wave is determined to be an interfering wave.

Compared to the above-mentioned RSSI monitoring, known RSS
Since the fluctuation of the RSSI of the received wave is monitored based on the fluctuation of the I data, the U wave can be detected more accurately.

(10) In the diversity receiver according to any one of (1) to (9), further, the input invalid reception for setting the number of received waves which can invalidate the inputs to the diversity processing unit at the same time. It has a wave number setting unit.

The input invalid reception wave number setting unit sets the number of reception waves for which inputs are invalidated to the diversity processing unit at the same time. Therefore, even if the number of U-wave receiving antennas is large, A constant received wave is input to the processing unit and diversity processing is performed. For this reason,
There is no risk of the received data being lost.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described.

First embodiment. The configuration of the diversity receiver of this embodiment will be described with reference to FIG. In addition,
The same components as those in the conventional diversity receiver are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 1, a plurality of antennas 11, 12 to 1N for receiving an incoming radio wave and each antenna 1
A plurality of detection units 21, 22 to 2N that detect the reception wave corresponding to 1, 12 to 1N and measure the reception electric field level (hereinafter referred to as "RSSI") of the reception wave, and the respective detection units 21 and 22. 2 to 3N, A / D converter units 31, 32 to 3N for A / D converting the RSSI information, and A / D
The converted RSSI information is processed by the method described below, and the calculation data is sent from the calculation units 41, 42 to 4N and the calculation data transmitted from the calculation units 41, 42 to 4N to the next interference wave determination units 51, 52 to 5N. An interference wave determination unit (hereinafter referred to as a “determination unit”) 5 that determines whether the received wave is an interference wave (U wave) based on
1, 52 to 5N constitute each branch 1, 2 to N of the diversity receiver.

Further, the detection unit 2 of each branch 1, 2 to N
Received wave demodulation information and RSSI obtained at 1, 21 and 2N
The information is sent to the diversity processing unit 100, and from the determination units 51, 52-5N of the branches 1, 2 -N,
The weighting information, which will be described later, is used as the diversity processing unit 10.
Sent to 0. Then, the diversity processing unit 100
Based on the RSSI information and the weighting information, demodulation information diversity processing is performed. This demodulated demodulated data is sent to the received data processing unit 200, and the received data processing unit 200 processes the received data based on the demodulated data.

Further, the timing instructing section 300 includes the A / D converter sections 31, 32 to 3 of the branches 1, 2 to N.
N, calculation units 41, 42 to 4N and determination units 51, 52 to 5
The input timing of the reception burst timing for determining the monitoring width of the RSSI change and the U-wave determination width, which will be described later, is given to N.

Next, the operation of the diversity receiver of this embodiment will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, a plurality of antennas 11,
The radio waves received by 12 to 1N are sent to the detection units 21, 22 to 2N corresponding to the antennas, respectively, and the detection unit 2
RSSI information is measured while being detected at 1, 22 to 2N. Then, the demodulation information detected by the detection units 21, 22 to 2N is used as the diversity processing unit 100.
The RSSI information output to the A / D converter units 31, 32-3 is detected by the detector units 21, 22-2N.
It is output to N.

The timing instructing section 300 sets two timings within a predetermined burst timing, that is, in the present embodiment, as shown in FIG.
/ D converter units 31, 32 to 3N, calculation units 41, 42
4N and determination units 51, 52 to 5N.

As a result, the A / D converter units 31, 3
2 to 3N A / D-convert the RSSI information of each of the designated timing A and timing B, and calculate the A / D-converted RSSI levels of both timings.
Output to ~ 4N. As shown in FIG. 2, the calculation units 41, 42 to 4N output the result (processed data) of the RSSI change amount obtained by subtracting the RSSI level of the timing A from the RSSI level of the timing B to the determination units 51, 52 to 5N. To do. A rising threshold for determination is input to the determination units 51, 52 to 5N in advance, and the determination units 51, 52 to 5N
If the amount of change (rise) of the RSSI is equal to or more than the rising threshold, it is determined as a desired wave (D wave), and if the amount of change of RSSI is less than the rise threshold, it is determined as an interfering wave (U wave).

Then, the decision units 51, 52 to 5N output weighting information to the diversity processing unit 100. The weighting information means the diversity processing unit 100.
In the present embodiment, which is the weighting information added to the demodulation information when performing the diversity processing in, the input of the demodulation information of the reception wave of the branch determined to be the U wave is invalidated,
When it is determined to be the D wave, it means that the demodulation information of the D wave is weighted in proportion to the magnitude of the RSSI.
For example, the determination units 51, 52 to 5N attach weighting information of “0” to the RSSI information of the branch determined to be the U wave, and output it to the diversity processing unit 100.

In the diversity processing section 100, the demodulation information from the detection sections 21, 22 to 2N of each branch 1, 2 to N is weighted in proportion to the size of the RSSI output from each branch 1, 2 to N. Processing is performed and demodulated data is obtained. The weighted demodulated data is input to the reception data processing unit 200, where the reception data is processed.

Therefore, according to the diversity receiver of the present embodiment, even if the RSSI of some branches fluctuates due to fading or the like and the U wave is input to some branches, The determination units 51, 52 to 5N of the branches 1, 2 to N detect U waves and invalidate the input of the received waves determined to be U waves to the diversity processing unit 100, so that reception based on U waves is performed. Data errors can be prevented. Therefore, it is possible to prevent the reception sensitivity from deteriorating due to the interference wave, reduce the adverse effects of the interference wave, and maintain good reception sensitivity. Therefore, stable processing of received data becomes possible.

Second Embodiment. FIG. 3 shows the configuration of the diversity receiver of this embodiment. The same components as those in the conventional and the diversity receivers of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the first embodiment, the decision units 51 and 52 are previously set.
Although the threshold value is input to 5N, in the present embodiment, as shown in FIG. 3, the rising threshold value setting unit 60 is provided,
The rising threshold value setting unit 60 sets rising threshold values for the determination units 51, 52 to 5N of each branch. As this rising threshold, for example, "how many dB or more R
If there is a change in SSI rising, will it be judged as rising? "
Detection conditions such as are input.

According to this embodiment, the rising threshold setting unit 6
By setting 0, the rising threshold for U-wave determination can be set to an optimum value according to the system, and thus, good reception sensitivity suitable for the system can be obtained.

Third Embodiment. The configuration and operation of the diversity receiver of this embodiment will be described with reference to FIGS. 4 and 5. The same components as those of the diversity receivers according to the first and second embodiments of the related art are denoted by the same reference numerals and the description thereof will be omitted.

The timing instruction section 300 of the diversity receiver of the first embodiment is set with two timings A and B (FIG. 2) at regular intervals, but the diversity receiver of the present embodiment further The timing correction unit 250 has a timing correction unit 250 that changes the RSSI monitoring width.
50 obtains the reception timing information from the reception data processing unit 200 as shown in FIG. 3, and outputs the correction of the monitoring timing to the timing instructing unit 300 as necessary, and after normally receiving the reception burst, The rising monitoring width, that is, the monitoring timings A1 and B1 shown in FIG. 5 are narrowed to the monitoring timings A2 and B2.

Normally, at the start of the reception operation, the accurate reception timing is not known, so the RSSI change monitoring width is set to a wider range (monitoring timings A1 and B1 shown in FIG. 5), but the U wave is at an arbitrary timing. R occurs because it occurs in
If a rising edge is detected within the SSI change monitoring range,
Even a U wave may be determined as a D wave and may be mistakenly recognized.

According to the diversity receiver of the present embodiment, after the burst input timing of the D wave is known (that is, after the burst is accurately received once), the R
By narrowing the SSI change monitoring width to the monitoring timings A2 and B2, the probability of erroneous detection can be reduced. This makes it possible to prevent the reception sensitivity from deteriorating.

Fourth Embodiment. The configuration and operation of the diversity receiver of this embodiment will be described with reference to FIGS. 4 and 6. The same components as those of the diversity receivers of the first to third embodiments are given the same reference numerals and the description thereof will be omitted.

Since the burst input timing also changes when the distance to the opposite radio device changes, in the present embodiment, the timing correction section 250 causes the rise monitoring width not only at the time of the first normal reception but also at every normal reception. The position is corrected by slide correction, and the monitor timing corrected by the slide correction is output to the timing instruction unit 300. As a result, the U wave can be accurately detected even if the burst input timing changes.

That is, as shown in FIG. 6, at the RSSI input timing 1, the next RSSI input timing 2 (the next burst monitoring timing A2, based on the reception timing (monitoring timing A1, B1) that was normally received).
Slide correct to B2).

For example, TDMA-TDD such as PHS
In a system (which transmits and receives in time division), the frame timing of a reception burst is detected based on the detection of a specific unique data string (hereinafter referred to as “UW”, where UW is a unique word). . Therefore, TDM
In the case of the A-TDD system, the reception timing position of the next burst can be determined on the basis of the UW detection position in the reception burst immediately before.

The slide correction method is as follows.
For example, the monitoring timing is slid back and forth in units of a predetermined clock in the wireless device. Since it is usually impossible for the burst reception timing to suddenly change, a slide correction allowable range may be provided.

Fifth Embodiment. The configuration and operation of the diversity receiver of this embodiment will be described with reference to FIG.
The same components as those of the diversity receivers of the first to third embodiments are given the same reference numerals and the description thereof will be omitted.

If a state in which reception with the opposite radio device is temporarily impossible continues, the accurate reception timing cannot be known, and it becomes impossible to monitor the rise of RSSI at the correct position.

Therefore, in the present embodiment, when the timing correction unit 250 does not perform the correction control on the timing instruction unit 300 to some extent, the timing correction unit 250 widens the rise monitoring width. This allows
The rise of RSSI can be detected, and the RSSI monitoring timing can be corrected. by this,
Even if the reception state deteriorates, it is possible to reduce the possibility of adversely affecting the U wave detection function.

Sixth Embodiment. The configuration and operation of the diversity receiver of this embodiment will be described with reference to FIGS. 7 and 8. The same components as those of the diversity receivers of the first to third embodiments are given the same reference numerals and the description thereof will be omitted.

Since the diversity receivers of the above-described first to fifth embodiments monitor only the start position of the reception burst, it cannot detect the U wave generated from the timing in the middle of the reception burst. There's a problem.

Therefore, in the diversity receiver of the present embodiment, as shown in FIG.
The change amounts of SSI are calculated by the calculation units 41, 42 to 4N, and the change amounts of RSSI are output to the determination units 51, 52 to 5N. For example, as shown in FIG. 7, the RSSI level is detected at the monitoring timings A, B, C, and D, and the change amount of the RSSI between the monitoring timings ((RSSI level of timing B-RSSI level of timing A),
(RSSI level of timing C-RS of timing B
SI level), (RSSI level of timing D-RSSI level of timing C)). On the other hand, the thresholds are set in the determination units 51, 52 to 5N by the fluctuation level threshold setting unit 70, and the determination units 51, 52 to 5N are set.
Compares the input RSSI change amount with this threshold value and determines whether or not it is a U wave. That is, the input RSS
When the amount of change in I changes by a threshold value or more, it is determined to be a U wave and the demodulation information from that branch is invalidated, while when it is less than the threshold value, it is determined to be a D wave and weighting information is added to the demodulation information.

In the present embodiment, the fluctuation level threshold setting unit 70 asks the judging units 51, 52 to 5N of each branch a U of "how many dB or more RSSI change is considered as a U wave". This is a means for variably setting the wave detection condition according to the system.

As a result, the U wave generated from the timing in the middle of the reception burst can be detected.
It is possible to reduce the adverse effects of reception due to waves.

Seventh Embodiment. The configuration and operation of the diversity receiver of this embodiment will be described with reference to FIG.
The same components as those of the diversity receivers according to the first to third and sixth embodiments in the related art are designated by the same reference numerals and the description thereof will be omitted.

In the second embodiment, as shown in FIG. 3, the rising threshold setting unit 60 causes the judging unit 5 of each branch to operate.
Although the rising thresholds are set for 1,52 to 5N, in the diversity receiver of the present embodiment, the falling threshold setting unit 80 causes the judging units 51, 5 of each branch.
Set falling thresholds for 2-5N. As the falling threshold value, for example, a detection condition such as "how many dB or more the RSSI falling change is determined to be the falling" is input.

In the case of this embodiment, the change in RSSI is monitored by providing two monitoring timings as shown in FIG. 2 at the tail position of the reception burst timing (that is, the burst falling timing).

As a result, even if the received wave is not determined to be the U wave at the rising edge of the received burst, it can be detected as the U wave, so that the adverse effect of the reception by the U wave can be reduced from the next received burst. it can.

Eighth Embodiment. The configuration and operation of the diversity receiver of this embodiment will be described with reference to FIGS. 10 and 11. The same components as those of the diversity receivers of the first to third, sixth, and seventh embodiments of the related art are designated by the same reference numerals, and the description thereof will be omitted.

The diversity receiver of this embodiment is shown in FIG.
As shown in 0, a known data information providing unit 90 that stores known received electric field level data is provided, and the known data information providing unit 90 includes the determination units 51, 52 to 5N of each branch.
To output known RSSI data. As a result, the determination units 51, 52 to 5N receive the input known RSS.
Fluctuation of I data (known RSSI) and RSS of received wave
Compare with I variation.

Generally, there is a known portion (for example, UW) in the RSSI data content. In addition, the relative variation of RSSI (for example, the transmission rate of 1
It is also possible to detect bit-by-bit changes, envelope fluctuations).

Therefore, the judgment units 51, 52 of the present embodiment.
5N is the RS of the received wave actually received for the known part
If the SI variation and the known RSSI data variation substantially match, it is determined that the received wave is correct (that is, D wave), while the RSSI variation of the received wave for the known portion is relative to the known RSSI data variation. When there is a significant difference between the changes, the received wave is determined to be an interfering wave.

Since the absolute value of RSSI is unknown,
As shown in FIG. 11, the diversity receiver of the present embodiment finely measures the RSSI of the received wave, and based on, for example, the RSSI change amount for each bit (increase / decrease of the RSSI one bit before and the current RSSI). , D wave or U wave is determined by comparing with known RSSI data. R for each bit
An allowable range may be set for fluctuations in SSI, and a wave exceeding the allowable range may be determined as a U wave.

Ninth Embodiment. The configuration and operation of the diversity receiver of this embodiment will be described with reference to FIG. The same components as those of the diversity receivers of the first to third and sixth to eighth embodiments of the related art are designated by the same reference numerals, and the description thereof will be omitted.

The diversity receiver of the present embodiment is further provided with an input invalid reception wave number setting unit for setting the number of reception waves which can invalidate inputs to the diversity processing unit 100 at the same time. This input invalid reception wave number setting unit is shown in FIG.
2 means the maximum U-wave branch number setting unit 150 in 2,
The maximum U-wave branch number setting unit 150 sets the allowable number of branches (hereinafter referred to as the “allowable number of U-wave branches”) of the branches in which the U-wave is detected, at which the input of the demodulation information can be invalidated at the same time. It is input to the diversity processing unit 100. It is preferable to select an optimum value for the “allowable set number of U-wave branches” according to the number of branches (the number of antennas) and the system.

As a result, even if the number of branches that have received the U wave is large, the demodulation information of the constant received wave is input to the diversity processing unit 100. Therefore, diversity processing is performed, demodulated data is output to the received data processing unit 200, and there is no risk of the received data being interrupted.

When a new U wave is judged from a certain branch and exceeds the “allowable set number of U wave branches”, the U wave is judged to be the first U wave among the branches that have been U waves until then. The received wave of the branch may be processed as a D wave. As a result, the reception sensitivity is slightly degraded, but there is no risk of interruption of reception.

[0076]

As described above, according to the diversity receiver of the present invention, the interference wave determination section detects whether or not the received wave is an interference wave (U wave) for each antenna, and further performs diversity processing. Since the input of the received wave judged as the U wave to the section is invalidated, even if some antennas have U
Even if a wave is received, it is possible to prevent an error in received data based on the U wave. Therefore, it is possible to prevent the reception sensitivity from being deteriorated by the interfering wave and reduce the adverse effect of the interfering wave.

Further, the interfering wave judging section compares the rising threshold value inputted from the rising threshold value setting section with the magnitude of RSSI rising change at the time of burst input of the received wave, and D
Since it is determined whether it is a wave or a U wave, if the rising threshold for U wave determination is set to an optimum value according to the system, good reception sensitivity suitable for the system can be obtained.

Further, since the timing correction section narrows the rise monitoring width after the reception burst has been normally received, the rise of the U wave is erroneously detected within the RSSI change monitoring width, and is falsely detected as the D wave. The probability can be reduced.

Further, when the state of being temporarily unable to receive with the opposite radio equipment continues, the accurate reception timing cannot be known and RSSI rise monitoring cannot be performed at the correct position. Therefore, the timing correction unit can detect the rising position of RSSI and correct the RSSI monitoring timing by widening the rising monitoring width when the unreceivable state continues for a predetermined time. Therefore, it is possible to reduce the possibility that the U-wave detection function will be adversely affected even when the reception state deteriorates.

In addition, the interfering wave determining unit determines whether the RSSI of the received wave
Is constantly monitored, and when the change in RSSI during the monitoring is greater than or equal to a certain fluctuation value, it is determined to be an interfering wave, and the input of the received wave is invalidated to the diversity processing unit, thereby receiving It is possible to detect the U wave generated from the timing in the middle of the burst. Therefore, it is possible to reduce the adverse effect of reception by the U wave.

Further, the interfering wave judging section monitors the RSSI at the tail position of the received burst timing of the received wave (that is, the burst falling timing),
For example, even a reception wave that is not determined to be a U wave at the rising edge of a reception burst can be detected as a U wave, so that the adverse effect of reception by the U wave can be reduced.

Further, the interfering wave determining section compares the RSSI fluctuation of the known RSSI data read from the known data information providing section with the RSSI fluctuation of the received wave to obtain the RS of the received wave.
When the SI fluctuation is different from the known RSSI fluctuation, the received wave is determined to be an interfering wave, so that the U wave can be detected more accurately as compared with the above-described RSSI monitoring.

Further, by the input invalid reception wave number setting unit,
Since the number of received waves for which input is invalidated is set to the diversity processing unit at the same time, a constant received wave is input to the diversity processing unit even if the number of antennas that received U waves is large. Diversity processing is performed. Therefore, there is no fear that the received data will be lost.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of a diversity receiver according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an operation of the diversity receiver according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a diversity receiver of a second exemplary embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a diversity receiver according to third, fourth and fifth embodiments of the present invention.

FIG. 5 is a diagram illustrating an operation of the diversity receiver of the third exemplary embodiment of the present invention.

FIG. 6 is a diagram illustrating an operation of the diversity receiver of the fourth exemplary embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of a diversity receiver of a sixth exemplary embodiment of the present invention.

FIG. 8 is a diagram illustrating an operation of the diversity receiver of the sixth exemplary embodiment of the present invention.

FIG. 9 is a block diagram illustrating a configuration of a diversity receiver of a seventh exemplary embodiment of the present invention.

FIG. 10 is a block diagram illustrating a configuration of a diversity receiver of an eighth exemplary embodiment of the present invention.

FIG. 11 is a diagram illustrating an operation of the diversity receiver of the eighth exemplary embodiment of the present invention.

FIG. 12 is a block diagram illustrating a configuration of a diversity receiver according to a ninth exemplary embodiment of the present invention.

FIG. 13 is a block diagram illustrating a configuration of a conventional diversity receiver.

[Explanation of symbols]

1,2, N branch, 11,12,1N antenna,
21,22,2N detector, 31,32,3N A / D
Converter part, 41, 42, 4N calculation part, 51, 5
2,5N determination unit, 100 diversity processing unit, 20
0 reception data processing unit, 300 timing instruction unit.

Claims (10)

[Claims] 1. A plurality of antennas for receiving an incoming radio wave, a plurality of reception electric field level measuring units respectively connected to the respective antennas for measuring a reception electric field level of a reception wave from the antennas, Diversity processing unit that performs diversity processing based on the received wave and the received electric field level, and monitor the change in the received electric field level received based on the output of the received electric field level measurement unit provided corresponding to each antenna, A diversity receiver comprising: a disturbance wave determination unit that determines whether or not the reception wave is an interference wave, and that invalidates the input of the reception wave that is determined to be the interference wave to the diversity processing unit. 2. The diversity receiver according to claim 1, wherein the interference wave determination unit monitors the reception electric field level at a head position of a reception burst timing of a reception wave. 3. A rising threshold value setting unit for setting a threshold value for a rising change in the received electric field level during a reception burst of a received wave, wherein the interfering wave determination unit sets the rising threshold value from the rising threshold value setting unit. The diversity receiver according to claim 2, wherein it is determined whether or not the received wave is an interference wave based on the received wave. 4. A timing correction unit that varies the monitoring width of the received electric field level, wherein the timing correction unit narrows the rise monitoring width after normally receiving a reception burst. The diversity receiver according to claim 2 or claim 3. 5. The timing correction unit obtains the position of the next reception burst based on the position of the reception burst immediately before, and slide-corrects the position of the rising monitor width so as to include the position of the next reception burst. The diversity receiver according to claim 4, wherein: 6. The diversity receiver according to claim 5, wherein the timing correction unit widens the rise monitoring width when a state in which reception is not possible continues for a predetermined time. 7. The interfering wave determination unit constantly monitors a change in the received electric field level of the received wave, and determines that the received electric field level is an interfering wave when the change in the received electric field level is equal to or more than a certain variation amount during the monitoring. The diversity receiver according to claim 1, wherein the input of the received wave is invalidated to the diversity processing unit. 8. The diversity receiver according to claim 1, wherein the interference wave determination unit monitors the received electric field level at a tail position of a received burst timing of a received wave. 9. A known data information providing unit that stores known received electric field level data, wherein the interference wave determination unit receives the received electric field of the known received electric field level data read from the known data information providing unit. The level fluctuation and the received electric field level fluctuation of the received wave are compared, and when the received electric field level fluctuation of the received wave is different from the known received electric field level fluctuation, it is determined that the received wave is an interfering wave. The diversity receiver according to claim 1, wherein the diversity receiver is a receiver. 10. An input invalid reception wave number setting unit for setting the number of reception waves whose inputs can be invalidated to the diversity processing unit at the same time.
10. The diversity receiver according to claim 9.