JP2003283399A - Radio apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption of a radio unit by preventing a deterioration in error rate characteristic. <P>SOLUTION: A first selecting section 201 selects a memory 202 for storing reception level information, and outputs the information to the selected memories 202a-202d. A second selecting section 203 judges whether the output level of each antenna which is outputted from the memory 202 is not greater than a threshold or not, and selects only the antenna having a reception level not greater than the threshold and outputs the reception level of the selected antenna to a level comparison section 204. The section 204 selects the antenna having the maximum reception level, and outputs the information of the selected antenna as antenna selection information. An antenna is selected on the basis of the information outputted from the section 204 to make transmission/reception with a mobile station device. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless device that transmits and receives by using a plurality of antennas.

[0002]

2. Description of the Related Art In a conventional radio apparatus, in a multipath environment, generally, the higher the reception level, the better the reception quality of the received signal. Therefore, the received signals received by a plurality of antennas are uniformly received. There is one that selects a reception signal having the maximum reception level and demodulates the reception signal having the selected maximum reception level.

[0003]

However, in the conventional radio equipment, the phenomenon in which the error rate becomes large when the reception level becomes a certain value or more is experimentally conducted especially when the communication is performed by the multilevel modulation method. However, there is a problem that the selection of the received signal having the maximum received level does not necessarily improve the received quality. Further, when a reception signal with the highest reception level is selected, there is a problem that power consumption increases during processing of the reception signal in the reception circuit and processing of the transmission signal in the transmission circuit. .

The present invention has been made in view of the above points, and an object thereof is to prevent the deterioration of the error rate characteristic and to reduce the power consumption of the receiving section and the transmitting section.

[0005]

According to the wireless device of the present invention, the reception level of the reception signal received by the plurality of antennas is the first.
Determination unit for determining whether or not the reception level is less than or equal to the threshold value, selection unit for selecting an antenna whose reception level is less than or equal to the first threshold value, and demodulation of a reception signal from the antenna selected by the selection unit. And a demodulation means.

According to this structure, the antenna whose reception level is less than or equal to the first threshold value is selected, and the antenna whose deterioration of the error rate characteristic is larger than the first threshold value is not selected. Can be prevented, and the power consumption of the receiving unit and the transmitting unit can be reduced.

The first threshold value in the radio apparatus of the present invention has a configuration that can be changed by a modulation method.

According to this structure, the first
Since the threshold value of is changed, it is possible to prevent the deterioration of the error rate characteristic in consideration of the error rate characteristic that changes according to the modulation method.

In the wireless device of the present invention, the first threshold value can be changed by the delay time between the received signals detected by the delay time detecting means.

According to this structure, the first
Since the threshold value of is changed, it is possible to prevent the deterioration of the error rate characteristic in consideration of the error rate characteristic that changes according to the delay time.

In the radio apparatus of the present invention, the first threshold value can be changed by a value obtained by dividing the delay time by the reception level of the antenna selected by the selecting means.

According to this structure, since the first threshold value is changed by the value obtained by dividing the delay time by the reception level,
Even if there is an AGC error, the delay time information generation error does not become large, and the deterioration of the error rate characteristic can be prevented.

The selecting means in the radio apparatus of the present invention does not select an antenna until the reception level of the currently selected antenna becomes less than a second threshold value which is smaller than the first threshold value. Take the composition.

According to this structure, when sufficient quality is obtained without switching the antennas, the antennas are not selected, so that the number of antenna selections is reduced and the received signal is reduced. The processing of can be simplified.

The radio apparatus of the present invention has a configuration including a selecting means for selecting one of the antennas on both sides of the currently selected antenna next to the currently selected antenna regardless of the reception level.

According to this configuration, only one antenna on both sides of the currently selected antenna is selected regardless of the change in the reception level, so that the antenna having the highest reception level of the interference wave can be mistakenly selected. Therefore, it is possible to prevent the deterioration of the error rate characteristic.

The wireless device of the present invention comprises a plurality of antennas,
Error detecting means for detecting an error in the received signal received by the antenna, and error information from the error detecting means when the error detecting means detects an error in the received signal, and at the time of receiving the error information, And a selecting unit that selects the selected antenna before the selected antenna.

According to this configuration, when an error occurs in the received signal after selecting the antenna, the antenna selected immediately before the currently selected antenna is selected, so that the antenna is erroneously selected. This can be prevented, and deterioration of the error rate characteristic can be prevented.

The radio apparatus of the present invention determines whether the total number of errors counted by the counter and the counter for counting the number of errors detected by the error detection means is equal to or more than a predetermined value. The error information is output to the selecting means when the error number determining means determines that the total number exceeds a predetermined value.

According to this configuration, the antenna is not selected unless the number of counted errors exceeds a predetermined value.
It is possible to prevent the antenna from being selected due to false error detection.

The antenna selected by the selecting means in the radio apparatus of the present invention has a configuration in which a transmission signal from one mobile station apparatus is received and used as a reception signal and the transmission signal is transmitted to the same mobile station apparatus. .

According to this structure, since the same line can be used for the uplink and the downlink, the mobile station apparatus needs only one antenna and the circuit scale of the mobile station apparatus can be reduced. You can

The selection means in the radio apparatus of the present invention has a configuration in which a plurality of antennas are selected in order and are simultaneously transmitted to a plurality of partners on a common channel.

According to this configuration, since the transmission signals are sequentially transmitted from the plurality of antennas to the plurality of parties, it is possible to eliminate the mobile station device in which the state of poor reception quality continues.

In the wireless device of the present invention, when communication is performed simultaneously by a plurality of modulation methods, the selecting means selects an antenna used for communication with a communication partner using the multilevel modulation method. .

According to this configuration, the antenna is selected and switched only when the received signal is from the mobile station apparatus using the multi-level modulation method in which the error rate easily deteriorates.
The processing of the entire communication is simplified, and the throughput of the entire system and the simplification of the processing can both be achieved.

In the wireless device of the present invention, when the communication is performed simultaneously in the continuous reception mode and the intermittent reception mode, the selecting means selects the antenna used for communication with the other party with whom the communication is performed in the intermittent reception mode. Take the composition.

According to this configuration, the antenna is selected and switched only when the received signal is from the mobile station apparatus that communicates in the intermittent reception mode in which the error rate characteristic deteriorates due to the large number of modulation levels. , The whole process is simplified,
Both throughput of the entire system and simplification of processing can be achieved.

In the wireless device of the present invention, in the case where communication is performed simultaneously with a plurality of parties having different use bandwidths, the selecting means selects an antenna used for communication with a party having a use bandwidth larger than a predetermined value. Take the composition.

According to this configuration, since only the antenna used for communication with the mobile station device having a large used bandwidth is selected, the whole process is simplified, and the throughput of the entire system and the simplification of the process are both achieved. be able to.

In the wireless device of the present invention, when communication is simultaneously performed with a plurality of parties having different use bandwidths, the selecting means adopts a configuration of selecting an antenna used for communication with the party having the largest use bandwidth. .

According to this configuration, in the case of performing communication with a plurality of parties including a party having a remarkably large band allocation,
Since only the antennas used for communication with the other party who has an extremely large number of band allocations are selected, the overall processing is simplified, and the throughput of the entire system and the simplification of the processing can both be achieved.

The selection unit in the wireless device of the present invention is
A configuration is adopted in which an antenna used for communication with a communication partner whose RSSI is a predetermined value or more is selected from a plurality of partners.

According to this configuration, based on RSSI,
Since only the antenna used for communication with the other party with poor reception quality is selected, the number of times the antenna is selected can be reduced, the processing can be simplified, and the number of memories storing the RSSI can be reduced.

In the radio apparatus of the present invention, the selecting means selects the antenna by delaying the received signal by one frame or more by the delay means.

According to this configuration, when the line fluctuation is sufficiently slower than the frame period of the received signal, the processing can be simplified by delaying the antenna selection by one frame or more of the received signal. .

The received signal in the radio apparatus of the present invention has a guard interval of a channel estimation preamble, and the selecting means adopts a configuration of selecting an antenna during the guard interval period.

According to this configuration, the antennas are switched during the guard interval of the propagation path estimation preamble, so that the antennas can be switched even in the uplink without deteriorating the AGC and the synchronization pull-in characteristic. it can.

The received signal in the radio apparatus according to the present invention has a signal area in which the polarities of the propagation path estimation preamble and the synchronization preamble are inverted, and the selecting means selects the guard interval and the signal area. The antenna is selected during the period.

Further, the received signal in the radio apparatus of the present invention includes a signal area in which the guard interval of the propagation path estimation preamble and the polarity of the synchronization preamble are inverted and 2
A symbol channel preamble for channel estimation, and the selecting means employs a configuration for selecting an antenna during one symbol period of the guard interval, the signal region, and the channel preamble for channel estimation.

According to these configurations, even when the number of antennas is large, the antennas can be switched without deteriorating the AGC and the sync pull-in characteristic.

The mobile station apparatus of the present invention has a configuration including any one of the above radio apparatuses.

Further, the base station apparatus of the present invention has a configuration including any one of the above radio apparatus.

With these configurations, it is possible to prevent the deterioration of the error rate characteristic and to reduce the power consumption of the radio section.

The receiving method of the present invention comprises a receiving level measuring step of measuring the receiving levels of receiving signals received by a plurality of antennas, and whether the receiving level measured by the receiving level measuring step is less than or equal to a first threshold value. A determination step of determining whether or not it is included, and a selection step of selecting an antenna whose reception level is equal to or lower than the first threshold value are provided.

According to this method, it is possible to prevent the deterioration of the error rate characteristic and to reduce the power consumption of the radio section.

[0047]

BEST MODE FOR CARRYING OUT THE INVENTION The inventor of the present invention has arrived at the present invention by paying attention to the fact that the error rate characteristic may be deteriorated when a reception signal having the maximum reception level is uniformly selected. It was

The essence of the present invention is that, in a multipath environment, the first received signal level received from a plurality of antennas is set to the first received level before the deterioration of the error rate characteristic. This is to select and demodulate a reception signal having a reception level below a threshold value.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment of the present invention, a case where a wireless device is applied to a base station device will be described.

(Embodiment 1) FIG.1 is a block diagram showing a configuration of a radio apparatus according to Embodiment 1 of the present invention.
The wireless device includes an antenna 101, a selection unit 102, and a reception unit 10.
3, demodulation unit 104, antenna control unit 105, modulation unit 10
6 and the transmission unit 107. Antenna 1
A plurality of 01s are provided, and receive the reception signal of each path in a multipath environment and output it to the selection unit 102. The received signal is an OFDM (Orthogonal F)
requisition division multipl
ex) signal, in which each symbol of a modulation signal subjected to 16QAM modulation is superimposed on a plurality of subcarriers orthogonal to each other. The selection unit 102 selects the antenna 101 based on the control signal of the antenna control unit 105, and the reception signal of the selected antenna 101 is received by the reception unit 103.
Output to. The receiving unit 103, which is a wireless unit, includes a selecting unit 10
The received signal input from 2 is frequency-converted into a base band band or an intermediate frequency band and output to the demodulation unit 104.
The demodulation unit 104 performs demodulation processing on the reception signal input from the reception unit 103 to obtain the reception signal. The antenna control unit 105 compares the reception level with a preset threshold value based on the reception level information input from the reception unit 103, selects the optimum antenna 101, and selects the optimum antenna 101 as the antenna selection information. Output to 102. Here, the reception level information is an RSSI (Receive S) that is a numerical representation of the strength of the received radio signal.
Signal Strength Indiciatio
Although it is n), it is applicable as long as it can quantify other than RSSI. The antenna control unit 105
The details of the configuration and the comparison between the reception level and the threshold value in the antenna control unit 105 will be described later. Modulation section 106 performs modulation processing on the transmission signal and then outputs the signal to transmission section 107. Transmission unit 107 which is a wireless unit
Outputs the transmission signal input from the modulation unit 106 to the selection unit 102 after frequency conversion into a radio frequency. Note that the antenna 101 selected by the antenna control unit at the time of reception is stored in a storage unit (not shown), and at the time of transmission, the same antenna 101 as the antenna 101 selected at the time of reception is used to transmit the received signal. It transmits to the same mobile station device as the transmission source mobile station device.

Next, a method of setting an error rate characteristic and a threshold value in the 16QAM modulation method will be described with reference to FIG. FIG. 3 shows PER (packet error).
is a graph showing the relationship between the rate) and the reception level. Since the error rate characteristic in the 16QAM modulation method deteriorates on the side where the reception level is low and the side where the reception level is high, the graph of FIG. 3 becomes a U-shaped curve. Therefore, on the side where the reception level is high, the position (-4
The first threshold value 301 is set to 0 dBm). Note that the first threshold value 301 is set and changed for each modulation method because the error rate characteristic changes for each modulation method.

Next, the configuration of the antenna controller 105 will be described with reference to FIG. The antenna control unit 105
First selection unit 201, memories 202a to 202d, second
The selection unit 203 and the size comparison unit 204 are mainly included. The first selection unit 201 selects the memories 202a to 202d that store the reception level information and outputs the reception level information to the selected memories 202a to 202d. The memories 202a to 202d are provided by the number of mobile station devices, store the reception level information input from the first selection unit 201 for each mobile station device, and output it to the second selection unit 203. The second selection unit 203, which is a determination unit, is provided in the memory 20.
It is determined whether or not the reception level in the reception level information input from 2a to 202d is less than or equal to the first threshold value at an arbitrary cycle, and the reception level less than or equal to the first threshold value is compared with the magnitude comparison unit. It is output to 204 as reception level information.
The size comparison unit 204, which is a selection unit, is the second selection unit 20.
The antenna 10 having the maximum reception level is compared by comparing the sizes of the reception levels in the reception level information output from
1 is selected and output to the selection unit 102 as antenna selection information.

Next, the operation of the radio apparatus having the above configuration will be described. First, the operation at the time of reception will be described. Received signals received by each antenna 101 by multipath are input to the selection unit 102 and received by the reception unit 103.
The reception level information is output to the antenna control unit 105. The reception level information input to the antenna control unit 105 is stored in the memories 202a to 202d for each mobile station device selected by the first selection unit 201, and output from the memories 202a to 202d to the second selection unit 203. Then, the second selection unit 203 determines whether or not it is equal to or less than the first threshold value 301. As a result of the determination, when the reception level is higher than the first threshold value 301, the second selection unit 203 does not output to the magnitude comparison unit 204. On the other hand, when the reception level is equal to or lower than the first threshold value 301, the reception level information is output from the second selection unit 203 to the magnitude comparison unit 204. The plurality of reception level information output from the second selection unit 203 to the magnitude comparison unit 204 are compared with each other in reception level by the magnitude comparison unit 204, and the antenna 1 which is the maximum reception level is obtained from the comparison result.
01 is selected and output to the selection unit 102 as antenna selection information. The selection unit 102 selects the antenna 101 based on the antenna selection information. The antenna 101 selected here stores from which mobile station device the transmission is made in a storage unit (not shown). The reception signal from the antenna 101 selected by the selection unit 102 is output from the selection unit 102 to the reception unit 103, frequency-converted into the base band band or the intermediate frequency band by the reception unit 103, and then to the demodulation unit 104. Output. The reception signal input to the demodulation unit 104 is demodulated and becomes a reception signal.

Next, the operation during transmission will be described. The transmission signal is input to the transmission unit 107 after being modulated by the modulation unit 106, frequency-converted into a radio frequency by the transmission unit 107, and output to the selection unit 102. Selection unit 102
The transmission signal output to is transmitted to the same partner as the received partner using the same antenna 101 based on the storage of the storage unit. Since the time division duplex (hereinafter referred to as “TDD”) is used as the access method, the same line can be used for the downlink and the uplink, and therefore the same antenna 101 can be used for transmission and reception. It will be possible.

As described above, according to the radio apparatus of this embodiment, the second selection section 203 selects the antenna 101 whose reception level is equal to or lower than the first threshold value, and selects the antenna with the maximum reception level from among them. Since the reception signal is obtained by selecting the antenna 101, the deterioration of the error rate characteristic can be prevented, and the antenna 101 having the reception level higher than the first threshold value is not selected, so that the power consumption of the reception unit and the transmission unit is reduced. Can be reduced. Further, since the same antenna 101 is used for each mobile station apparatus at the time of transmission and at the time of reception, the number of antennas 101 of the mobile station apparatus can be one, and the circuit scale on the side of the mobile station apparatus is greatly reduced. be able to.

Although the receiving antenna and the transmitting antenna are the same antenna in the present embodiment, the receiving antenna and the transmitting antenna may be separate. In this case, communication may be performed by a method other than TDD. Further, in the present embodiment, the size comparison unit 204 selects the antenna with the maximum reception level. However, if the reception level is -60 dBm or higher, the reception level is equal to or lower than the first threshold value. Even if an arbitrary antenna is selected from the above, the same effect can be obtained. Further, in the present embodiment, second selection section 203 decides only whether or not the reception level is equal to or lower than the first threshold value. Set a threshold value of 2 and set the reception level to the first
It is also possible to select from antennas that are less than or equal to the threshold value of and greater than or equal to the second threshold value. Second in this case
The threshold value of −60 dBm in this embodiment.
Is.

(Embodiment 2) FIG. 4 is a diagram showing the configuration of a radio apparatus according to Embodiment 2 of the present invention, and FIG.
It is a figure which shows the structure of the antenna control part 105 of the radio | wireless apparatus which concerns on Embodiment 2 of this invention. In the present embodiment, the configuration in which control unit 401 is provided in FIG. 4 differs from that in FIG. 1, and threshold selection unit 501 in FIG.
2 is different from the configuration of FIG. 2 and the other configurations are the same as those of FIGS. 1 and 2, and therefore, the same reference numerals are given and the description thereof is omitted.

The control unit 401 uses 16QAM or 64
Information on the QAM modulation method is output to the antenna control unit 105. The threshold selection unit 501 uses 16QAM or 6
The information of the 4QAM modulation method is input, and the 16QAM threshold value or the first threshold value that is the first threshold value that is predetermined according to the error rate characteristic based on this modulation method information. The threshold value of 64QAM is selected, and the selection result is output to the second selection unit 203.

Next, the operation of the radio apparatus having the above configuration will be explained using FIG. 4 and FIG. Information on the 16QAM or 64QAM modulation method is output from the control section 401 to the threshold selection section 501 of the antenna control section 105, and the threshold selection section 501 uses the 16QAM threshold value based on the modulation method information. The second selection unit 203 by selecting either the value or the threshold value of 64QAM.
Output to. In the case of the 16QAM modulation method, it is determined whether the reception level information input to the second selection unit 203 is less than or equal to the 16QAM threshold selected by the threshold selection unit 501, and reception is performed. When the level is higher than the threshold of 16QAM, the reception level information is not output from the second selecting unit 203 to the magnitude comparing unit 204, and when the reception level is equal to or lower than the threshold of 16QAM, The reception level information is transmitted from the second selection unit 203 to the magnitude comparison unit 20.
4 is output. On the other hand, in the case of the 64QAM modulation method, it is determined whether the reception level is equal to or lower than the 64QAM threshold selected by the threshold selection unit 501, and the reception level is lower than the 64QAM threshold. When the reception level is larger than the threshold of 64QAM, the reception level information is not output from the second selection unit 203 to the magnitude comparison unit 204. It is output from 203 to the magnitude comparison unit 204. In addition,
Since other operations are the same as those in the first embodiment, the description thereof will be omitted.

Generally, the more the modulation method with a large number of modulation levels,
Errors due to non-linear distortion of the wireless unit are likely to occur. Therefore, 64QAM is more prone to error due to distortion of the radio section than 16QAM, and therefore 64QAM is more error-prone than 16QAM.
Set the threshold value of to a lower value.

As described above, according to the radio apparatus of this embodiment, the first threshold value is selected by threshold selection section 501 according to the modulation method.
Since the threshold value of is changed, the threshold value can be changed in consideration of the error rate characteristic according to the modulation method, and the deterioration of the error rate can be reliably prevented. Further, since the antenna 101 having the reception level higher than the first threshold value is not selected, the power consumption of the transmitting unit 107 and the receiving unit 103 can be reduced.

The first threshold value selected by the threshold value selecting unit 501 is not limited to the case of selecting by the modulation method of 16QAM and 64QAM, but the threshold value by the information of another modulation method such as 8QAM. Even if is selected, the same effect can be obtained.

(Embodiment 3) FIG. 6 is a block diagram showing the configuration of a radio apparatus according to Embodiment 3 of the present invention.
FIG. 7 is a diagram showing the configuration of the antenna control unit of the radio apparatus according to Embodiment 3 of the present invention, and FIG. 8 is a diagram showing the configuration of delay dispersion generation unit 701. In the present embodiment, the configuration in which demodulation section 104 outputs the received signal to antenna control section 105 is different from the configuration in FIG. 1, and the other configurations are the same as in FIG. And its description is omitted. In the antenna control unit 105,
The configuration in which the delay dispersion generation unit 701, the magnitude comparison unit 702, and the threshold value selection unit 703 are provided is different from the configuration in FIG. 2, and the other configurations are the same as those in FIG. The description is omitted.

Demodulation section 104 demodulates the received signal input from receiving section 103 to form a received signal and outputs the signal to antenna control section 105. The delay dispersion generator 701 extracts a preamble of the received signal from the signal after the fast Fourier transform (hereinafter referred to as “FFT”),
The delay time is detected and output to the magnitude comparison unit 702. The delay time can be detected by averaging the absolute values of the reception level differences between adjacent subcarriers in the signal after FFT for the number of subcarriers. The details of the configuration of the delay dispersion generator 701 will be described later. The magnitude comparison unit 702 compares the delay time input from the delay dispersion generation unit 701 with a preset threshold value 3 (threshold value different from the first threshold value and the second threshold value). The comparison result is output to the threshold selection unit 703. The threshold value selecting unit 703 is the threshold value 1 or the first threshold value that is the first threshold value set to a different reception level according to the comparison result input from the magnitude comparing unit 702. The threshold value 2 is selected, and the selection result is output to the second selection unit 203.

Next, the configuration of the delay dispersion generator 701 will be described with reference to FIG. The delay dispersion generator 701
Delay circuit 801, subtraction circuit 802, absolute value conversion circuit 803
And an averaging circuit 804. The delay circuit 801 receives the signal obtained by performing FFT on the preamble of the received signal, delays the input signal, and subtracts it from the subtraction circuit 80.
Output to 2. The subtraction circuit 802 calculates the difference between the signal levels of adjacent subcarriers and outputs it to the absolute value conversion circuit 803. The absolute value conversion circuit 803 converts the subtraction result input from the subtraction circuit 802 into an absolute value and outputs the absolute value to the averaging circuit 804. The averaging circuit 804 averages the absolute values of the reception level differences input from the absolute value averaging circuit 803 for the number of subcarriers and outputs the averaged values as delay dispersion information to the magnitude comparison unit 702.
In general, when the multipath delay time is short, the reception level difference between adjacent subcarriers is small, and when the multipath delay time is long, the reception level difference between adjacent subcarriers is large. Therefore, the delay time of multipath can be found by finding the reception level difference between adjacent subcarriers.

Next, a method of setting the first threshold value will be described. The received signal after the FFT of the preamble output from the demodulation unit 104 is input to the delay dispersion generation unit 701, delayed by the delay circuit 801 and then subtracted by the subtraction circuit 802, and between adjacent subcarriers. The signal level difference is determined. The difference between the calculated signal levels is
An absolute value is converted by the absolute value conversion circuit 803, and the averaging circuit 80
4, the magnitude comparison unit 70 is averaged to obtain delay dispersion information.
2 is output. The delay dispersion information is determined by the magnitude comparison unit 702 to be equal to or greater than the preset threshold value 3, and the determination result is output to the threshold value selection unit 703. Threshold selection section 703 selects a first threshold value to be compared with the reception level based on this determination result, and outputs the selected threshold value information to second selection section 203. The operation of the other wireless devices is the same as that of the above-described first embodiment, and thus the description thereof is omitted.

As described above, according to the radio apparatus of this embodiment, when the threshold value selecting section 703 selects a threshold value,
Since the first threshold value is changed in consideration of the delay time of the received signal due to multipath, it is possible to prevent the deterioration of the error rate characteristic. In addition, the antenna 10 which always has the maximum reception level
Since 1 is not selected, it is possible to reduce power consumption during processing in the receiving unit 103 and the transmitting unit 107.

In the present embodiment, the delay dispersion information is generated for the signal subjected to the FFT processing, but the present invention is also applicable to the case where the delay dispersion information for the signal not subjected to the FFT processing is generated.

(Embodiment 4) FIG. 9 is a diagram showing the configuration of an antenna control unit according to Embodiment 4 of the present invention, and FIG. 10 is a diagram showing the configuration of a delay dispersion generator. In this embodiment, the configuration of the wireless device is the same as that in FIG. 6, and therefore its explanation is omitted. Further, in the present embodiment, the configuration in which the reception level of the currently selected antenna is output from the magnitude comparison unit 204 to the delay dispersion generation unit 902 in FIG. 9 is different from the configuration in FIG. 7, and Figure 1
0 is different from the configuration of FIG. 8 in that the delay dispersion generation unit is provided with the division circuit 901, and other configurations are the same as those of FIGS. 7 and 8. Is omitted.

Generally, in digital radio communication, AGC is performed in the radio section, but if the signal-to-noise power ratio is poor, the AGC error may increase. In this case, if the multipath delay time is calculated from the reception level difference between adjacent subcarriers, an error occurs in the multipath delay time information. The present embodiment reduces the error in the delay time information.

The magnitude comparison section 204 outputs the antenna selection information to the selection section 102 and the delay dispersion generation section 902. The delay dispersion generation unit 902 outputs the delay dispersion information to the size comparison unit 702 using the antenna selection information input from the size comparison unit 204. The division circuit 901 in the delay dispersion generation unit 902 divides the averaged reception signal output from the averaging circuit 804 by the reception level of the currently selected antenna input from the magnitude comparison unit 204 to determine the magnitude. Output to the comparison unit 702.

As described above, according to the radio apparatus of this embodiment, in addition to the effects of the third embodiment, the division circuit 90
Since 1 divides the multipath delay time by the reception level, it is possible to prevent the multipath delay time information generation error from increasing even when there is an AGC error.

(Embodiment 5) FIG. 11 is a diagram showing a configuration of an antenna control unit of a radio apparatus according to Embodiment 5 of the present invention. In this embodiment, the configuration of the wireless device is the same as that in FIG. 1, and therefore its explanation is omitted. Further, in the present embodiment, the configuration in which the third selection unit 1001 is provided is different from the configuration in FIG. 2 and the other configurations are the same as those in FIG. Is omitted.

When an interference wave exists and its level is high, the selected antenna with the highest reception level may be the antenna with the highest reception level of the interference wave. In this embodiment, the antenna having the highest reception level of the interference wave is not selected.

When selecting antenna 101 for the first time, third selecting section 1001 in antenna control section 105 outputs it directly to size comparing section 204 without selecting antenna 101. Once the optimum antenna 101 is selected, the third selection unit 1001 causes the currently selected antenna 101 and the currently selected antenna 10 to be selected.
The reception level information of the antennas 101 on both sides of 1 is selected and output to the magnitude comparison unit 204. The size comparison unit 204 uses the three antennas 101 input from the third selection unit 1001.
Of the three antennas 101 and outputs the antenna selection information of the antenna 101 having the maximum reception level among the three antennas 101 to the selection unit 102. When the three antennas 101 are selected by the third selection unit 1001, the antennas 101 on both sides of the currently selected antenna 101 are larger than the first threshold value, and therefore the second selection unit 203 is selected. If not selected, the third selection unit 1001 continues to select the currently selected antenna 101. Further, when only one of the antennas 101 on both sides of the currently selected antenna 101 is larger than the first threshold value, the magnitude comparison unit 204 determines that the antennas on both sides which are equal to or less than the first threshold value. The remaining one of the antennas 101 and the currently selected antenna 101 are compared in size, and the antenna 101 having the higher reception level is selected.

Next, the operation of the radio apparatus having the above configuration will be explained using FIG. Antenna 101 still
When is not selected, the reception level information input from the second selection unit 203 to the third selection unit 1001 is output to the magnitude comparison unit 204 as it is. On the other hand, when the antenna 101 is already selected, the second selection unit 20
The reception level information input to the third selection unit 1001 from the third selection unit 1001 selects the reception level information of the currently selected antenna 101 and the antennas 101 on both sides of the currently selected antenna 101 in the third selection unit 1001. And outputs it to the magnitude comparison unit 204. The reception level information of the three antennas 101 input to the size comparison unit 204 is compared in size with each other, and the one having the highest reception level is selected, and the selection result is selected as the antenna selection information by the selection unit 1.
Output to 02. The other operations are the same as those in the first embodiment, and thus the description thereof will be omitted.

As described above, according to the radio apparatus of this embodiment, only the antennas 101 on both sides of the antenna 101 having the maximum reception level are selected, so that the antenna 101 having the maximum reception level of the interference wave is erroneously selected. It is possible to prevent the error rate characteristic from deteriorating. Moreover, since the antenna 101 having the highest reception level is not always selected,
Power consumption can be reduced during processing in the receiving unit 103 and the transmitting unit 107.

In this embodiment, the antenna 101 is selected from the currently selected antenna 101 and the antennas 101 on both sides of the antenna 101. However, if the antenna 101 is not affected by the interference wave. , The number of antennas to be selected is arbitrary. Further, in the present embodiment, the antenna 101 having the maximum reception level is selected from the three antennas adjacent to each other, but if the reception level is not extremely low, the antenna having the maximum reception level is not necessarily required. It is not necessary to select 101.

(Embodiment 6) FIG. 12 is a diagram showing the configuration of an antenna control unit of a radio apparatus according to Embodiment 6 of the present invention. In this embodiment, the configuration of the wireless device is the same as that in FIG. 1, and therefore its explanation is omitted. Further, in the present embodiment, the configuration in which the magnitude comparison unit 1101 is provided is different from the configuration in FIG. 2 and the other configurations are the same as those in FIG. 2, so the same reference numerals are given and their description is omitted. To do.

The magnitude comparison section 1101 first sets the second threshold value 302. The second threshold 302 is shown in FIG.
As shown in, the reception level is smaller than the first threshold value 301 and the error rate characteristic is drastically reduced.
Set to. The second threshold value 302 can be set and changed according to the change in the error rate characteristic. Size comparison section 110
1 monitors whether the reception level is equal to or higher than the second threshold 302, and outputs the control signal to the second selection unit 203 only when the reception level is lower than the second threshold 302.
The second selection unit 203 selects the antenna 101 only when receiving the control signal from the magnitude comparison unit 1101.

Next, the operation of the radio apparatus having the above configuration will be explained using FIG. The reception level information is
It is input to the magnitude comparison unit 1101 and the first selection unit 201.
The reception level in the reception level information input to the magnitude comparison unit 1101 is compared with the second threshold value 302. When the reception level is less than the second threshold 302, the magnitude comparison unit 1101 does not output the control signal to the second selection unit 203, but when the reception level is the second threshold 302 or more, The magnitude comparison unit 1101 outputs the control signal to the second selection unit 203. The reception level in the reception level information input to the second selection unit 203 is the second selection unit 20.
At 3, it is determined whether it is less than or equal to the first threshold value. This determination result is obtained from the magnitude comparison unit 1101 to the second selection unit 2
If the control signal is not sent to 03, it is not output to the magnitude comparison unit 204, but if the control signal is sent from the magnitude comparison unit 1101 to the second selection unit 203,
It is output to the magnitude comparison unit 204. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

As described above, according to the radio apparatus of this embodiment, in the magnitude comparison section 1101, the reception level is the second level.
Since the antenna 101 is not switched unless it becomes less than the threshold value 302, the antenna 101 that maximizes the interference wave is not selected and the deterioration of the error rate characteristic can be prevented. Also, since the number of times of antenna switching control is small, the processing of the received signal becomes simple. Further, since the antenna 101 having the highest reception level is not always selected, it is possible to reduce power consumption during the processing in the reception unit 103 and the transmission unit 107.

In the present embodiment, the second selecting section 203 compares the reception level with the first threshold value when receiving the control signal from the magnitude comparing section 1101. When the control signal is not output from 1101 to the second selection unit 203, the same effect can be obtained by comparing the reception level with the first threshold value.

(Embodiment 7) FIGS. 13 and 14 are diagrams showing the configurations of a radio apparatus and an antenna controller according to Embodiment 7 of the present invention. In the present embodiment, the configuration in which error detecting section 1201 is provided is different from the configuration in FIG. 1 and the other configurations are the same as in FIG. 1, and therefore the same reference numerals are given and their description is omitted. Further, in the present embodiment, second selection section 203 has a configuration in which error information is input from error detection section 1201 and second selection section 203.
2 is different from the configuration in FIG. 2 and the other configurations are the same as those in FIG. 2, and therefore the same reference numerals are given and the description thereof is omitted.

Error detecting section 1201 outputs error information to second selecting section 203 of antenna control section 105 when an error is detected in the received signal. The error detection method in the error detection unit 1201 is performed by CRC (Cyclic Re).
It is carried out by an arbitrary method such as a dunancy check). When the error information is input from the error detection unit 1201, the second selection unit 203 compares the antenna selection information for selecting the antenna 101 selected immediately before with the magnitude comparison unit 2.
It is output to the selection unit 102 without going through 04.

Next, the operation of the radio apparatus having the above configuration will be described. The received signal output from the demodulation unit 104 is input to the error detection unit 1201 and the error detection unit 1201
Is detected as an error. If the error detection unit 1201 does not detect an error, the error detection unit 1201 does not output error information to the second selection unit 203, but the error detection unit 1201 does not output the error information.
If an error is detected in 1, the error detecting unit 1201
The error information is output to the second selection unit 203. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

Next, the operation of processing the reception level information will be described. If no error information is input from the error detection unit 1201 to the second selection unit 203, it is determined whether the reception level information input to the second selection unit 203 is less than or equal to a preset first threshold value. If it is greater than the first threshold value, it is not output to the magnitude comparison unit 204, and if it is less than or equal to the first threshold value, it is output to the magnitude comparison unit 204. When the error information is input from the error detection unit 1201 to the second selection unit 203, the second selection unit 203 outputs the currently selected antenna 101 regardless of the reception level information input from the memories 202a to 202d. The antenna selection information for selecting the previously selected antenna 101 is
The data is output to the selection unit 102 without passing through the magnitude comparison unit 204. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

As described above, according to the radio apparatus of this embodiment, when an error occurs in the received signal after selecting the antenna, the antenna 101 selected immediately before the currently selected antenna 101 is selected. Therefore, the antenna 10
1 can be prevented from being switched, the error rate characteristic can be prevented from being deteriorated, and the antenna 101 having the highest reception level is not always selected.
Also, it is possible to reduce power consumption during processing in the transmission unit 107.

(Embodiment 8) FIG. 15 is a diagram showing the configuration of an antenna control unit according to Embodiment 8 of the present invention.
In this embodiment, the configuration of the wireless device is the same as that in FIG. 13, and therefore its explanation is omitted. Further, in the present embodiment, the counter 1401 and the magnitude comparison unit 1402.
14 is added to the configuration of FIG. 14, and the other configurations are the same as those of FIG. 14, and thus the same reference numerals are given and the description thereof is omitted.

Error detector 1401 detects an error by CRC and outputs the detection result to counter 1401. The counter 1401 increments the number by one each time it is judged to be an error by CRC and counts it, and outputs the total number of the errors to the magnitude comparison unit 1402. The magnitude comparison unit 1402, which is an error number determination unit, includes a counter 1401.
The total number of errors entered is compared with a preset threshold value 4 (threshold value different from the first threshold value and the second threshold value) that has been set in advance. When the threshold value is 4 or more, the currently selected antenna 1
The control signal for returning to the antenna 101 selected immediately before 01 is output to the second selection unit 203. When an error occurs in the received signal, the second selecting section 203 receives the error information from the magnitude comparing section 1402.

Next, the operation of the radio apparatus having the above configuration will be described. The received signal output from the demodulation unit 104 is input to the error detection unit 1201 to detect whether there is an error. When an error is detected, the error detection unit 12
01 outputs CRC information to the counter 1401, and the counter 1401 counts the number of errors by one each time the CRC information is output. The number of errors counted by the counter 1401 is determined by the magnitude comparison unit 1402 to be a preset threshold value of 4 or more, and the control signal is sent to the second selection unit 203 only when the threshold value is 4 or more. Output. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

Next, the processing operation of the reception level information will be described. If no error information is input from the magnitude comparison unit 1402 to the second selection unit 203, the reception level information input to the second selection unit 203 is the first threshold value set in advance in the second selection unit 203. It is determined whether or not it is less than or equal to, and if it is larger than the first threshold value, the magnitude comparison unit 2
It is not output to 04, but if it is less than or equal to the first threshold value, it is output to the magnitude comparison unit 204. Size comparison unit 1402
If error information is input from the to the second selection unit 203,
The second selection unit 203 selects the antenna 101 selected immediately before the currently selected antenna 101, regardless of the reception level information input from the memories 202a to 202d. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

As described above, according to the radio apparatus of this embodiment, the CRC information is counted, and only when the number of counts is equal to or greater than the threshold value 4, one antenna before the currently selected antenna 101 is detected. Since the selected antenna 101 is selected, the line quality can be accurately estimated, and the optimum antenna 10
Since 1 can be selected, the error rate characteristic can be prevented from being deteriorated, and the power consumption of the wireless unit can be reduced. Also, unless the number of counted errors exceeds a predetermined value,
Since the antenna 101 is not switched, the antenna 101 does not switch due to erroneous error detection.

Although CRC is used as the error detecting method in the present embodiment, the same effect can be obtained by using an error detecting method other than CRC.

(Embodiment 9) FIG. 16 is a diagram showing the configuration of an antenna control unit according to Embodiment 9 of the present invention.
In the present embodiment, the configuration of the wireless device is the same as that in FIG. 4, and therefore its explanation is omitted. Further, the control unit 401 outputs the modulation method used for communication with the mobile station apparatus to the second selection unit 203 and the memories 202b and 20b.
The configuration in which the number of 2c is small is different from that in FIG. 2, and the other configurations are the same as those in FIG. 2, and therefore, the same reference numerals are given and the description thereof is omitted.

The control unit 401 determines the PHY mode in an environment in which communication is simultaneously performed using a plurality of modulation methods, and the mobile station apparatus which is performing communication using a multilevel modulation method such as 16QAM. Information of the second selection unit 203
Output to. The second selection unit 203, based on the mobile station device information input from the control unit 401, uses only the first threshold value for the reception level in the reception level information of the mobile station device that is communicating by the multilevel modulation method. It is determined whether or not it is the following, and the result is output to the magnitude comparison unit 204. For the reception level information from the mobile station device that is communicating using a modulation method other than the multi-level modulation method, the second selection unit 203
Does not make a determination as to whether it is less than or equal to the first threshold. In this way, the reception level information from the mobile station device that communicates by a modulation method other than the multilevel modulation method is stored in the memories 202b, 2b.
02c does not need to be stored in the memories 202b and 202c as many as the number of mobile station devices that communicate using the multilevel modulation method.
To provide.

Next, the operation of the radio apparatus having the above configuration will be described. First, the case where a received signal is received from the mobile station device will be described. The control unit 401 determines a modulation method used for communication for each communication partner, and stores information on the determined modulation method. Second selection unit 203
Selects the reception level information from the mobile station device that is communicating by the multilevel modulation method based on the information about the modulation method of the mobile station device input from the control unit 401, and selects the reception level information from the selected reception level information. Then, the antenna 101 having a reception level equal to or lower than the first threshold is selected, and the reception level information of the selected antenna 101 is output to the magnitude comparison unit 204. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

Next, the operation of transmitting to the mobile station apparatus will be described. Based on the antenna selection information input from the antenna control unit 105 to the selection unit 102, the transmission signal input to the selection unit 102 is transmitted to the mobile station device communicating with the multilevel modulation method only when the antenna 101 is transmitted. When transmitting by switching and transmitting to a mobile station apparatus that communicates by a modulation method other than the multilevel modulation method, the antenna 10 is used.
Switching of 1 is not performed. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

As described above, according to the radio apparatus of this embodiment, the antenna 101 is selected and switched only when the received signal is from the mobile station apparatus using the multilevel modulation method. The processing is simplified, and the throughput of the entire system and the simplification of the processing can both be achieved. Further, since only the reception level information of the mobile station device that communicates using the multilevel modulation method needs to be stored in the memories 202b and 202c, the number of memories 202b and 202c can be reduced. Further, since the antenna 101 can be switched only for communication with a predetermined specific partner, it is possible to specify the partner who wants to prevent deterioration of the error rate for communication. Further, with respect to the mobile station apparatus using the multi-level modulation method, it is possible to prevent the deterioration of the error rate and reduce the power consumption of the receiving unit 103 and the transmitting unit 107.

It should be noted that the antenna switching is not limited to the case of the multi-level modulation method, and the selection of the modulation method for switching the antenna is arbitrary according to the communication environment. Also,
The antennas may be switched only when receiving, and the same antenna may be used when transmitting, or the antennas may be switched in order regardless of the reception level and transmitted.

(Embodiment 10) In the present embodiment, the configuration of the radio apparatus is the same as that of FIG. 4, and therefore its explanation is omitted. Further, in the present embodiment, the control unit 40
The configuration is the same as that in FIG. 16 except that the reception mode information is output from the first to the second selection units 203, and the description thereof will be omitted.

Generally, the reception mode includes a continuous reception mode and an intermittent reception mode. In the continuous reception mode, since the timing and the like are not fixed, the processing becomes very complicated to switch the antenna. However, in the continuous reception mode, since the number of modulation levels is small, it is not difficult to obtain sufficient quality without switching antennas.

In this embodiment, a case will be described in which communication is performed simultaneously in both the continuous reception mode and the intermittent reception mode. The control unit 401 displays the second reception mode information indicating whether the reception mode is the continuous reception mode or the intermittent reception mode.
To the selection unit 203. The second selecting unit 203, based on the mobile station device information input from the control unit 401, is less than or equal to the first threshold value only for the reception level in the reception level information of the mobile station device communicating in the intermittent reception mode. It is determined whether or not it is output to the magnitude comparison unit 204. Regarding the reception level in the reception level information from the mobile station device that is communicating in the continuous reception mode, the second selection unit 203 does not determine whether it is below the first threshold value. In this way, the reception level information from the mobile station device that communicates in the continuous reception mode is stored in the memory 2
02b and 202c need not be stored in the memory 202 as many as the number of mobile station devices that communicate in the intermittent reception mode.
b and 202c are provided.

Next, the operation of the radio apparatus having the above configuration will be described. First, the case where a received signal is received from the mobile station device will be described. The control unit 401 stores in advance information on whether the mobile station device of the communication partner is in the continuous reception mode or the intermittent reception mode. Second
The selection unit 203 of selects the reception level information from the mobile station device communicating in the intermittent reception mode based on the mobile station device information input from the control unit 401, and selects from the selected reception level information. , The antenna 101 having a reception level equal to or lower than the first threshold value is selected, and the reception level information of the selected antenna 101 is output to the magnitude comparison unit 204. On the other hand, with respect to the reception level in the reception level information of the mobile station device that is communicating in the continuous reception mode, the second selection unit 203 does not determine whether it is equal to or higher than the first threshold value. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

Next, the operation of transmitting to the mobile station apparatus will be described. Based on the antenna selection information input from the antenna control unit 105 to the selection unit 102, the transmission signal input to the selection unit 102 switches the antenna 101 only when transmitting to the mobile station device that communicates in the discontinuous reception mode. Antenna 101 is not switched when transmitting to the mobile station apparatus that communicates in the continuous reception mode. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

As described above, according to the radio apparatus of this embodiment, the antenna 101 is selected and switched only when the received signal is from the mobile station apparatus that communicates in the intermittent reception mode. Can be simplified, and both throughput of the entire system and simplification of processing can be achieved at the same time. Further, since only the reception level information of the mobile station device that communicates in the discontinuous reception mode needs to be stored in the memories 202b and 202c, the number of memories 202b and 202c can be reduced. Further, since the antenna 101 is selected only for communication with a predetermined specific partner, it is possible to specify the partner who wants to prevent deterioration of the error rate and perform communication. Further, with respect to the mobile station device that is communicating in the discontinuous reception mode, it is possible to prevent the error rate from deteriorating and reduce the power consumption of the receiving unit 103 and the transmitting unit 107.

The antenna 101 is used only when receiving.
The same antenna 101 when switching and transmitting.
May be used, or the antenna 101 may be sequentially switched and transmitted regardless of the reception level.

(Embodiment 11) FIG. 17 is a diagram showing the configuration of an antenna control unit according to Embodiment 11 of the present invention. In this embodiment, the wireless device has the same configuration as that in FIG. 4, and therefore description thereof will be omitted. In addition, in the present embodiment, a magnitude comparison unit 1601 is added to FIG. 16, and the other configurations are the same as those in FIG. 16, so the same reference numerals are given and the description thereof is omitted.

In general, as the number of mobile station devices increases, when the antenna switching is performed for all mobile station devices, the process becomes complicated and the memory for storing antenna information increases. In addition, the throughput of the entire system is determined by the mobile station device that has a lot of bandwidth allocation.

In this embodiment, a case will be described in which communication is performed simultaneously with a plurality of parties having different used bandwidths. The control unit 401 stores the used bandwidth used by each mobile station device, and compares the band allocation information for each mobile station device with the size comparison unit 16.
Output to 01. The size comparison unit 1601 includes a control unit 401.
Whether the bandwidth allocation information for each mobile station device is input and the used bandwidth is equal to or greater than the preset threshold value 5 (threshold value different from the first threshold value and the second threshold value) If the used bandwidth is 5 or more, the mobile station device information is output to the second selection unit 203. Second
Based on the mobile station device information input from the size comparison unit 1601, the selection unit 203 of 1 only includes the reception level in the reception level information of the mobile station device whose used bandwidth in the size comparison unit 1601 is 5 or more. Is determined to be less than or equal to the first threshold value, and the reception level information of the antenna 101 less than or equal to the first threshold value is selected and the magnitude comparison unit 1 is selected.
Output to 601. Regarding the reception level in the reception level information of the mobile station device whose used bandwidth is smaller than the predetermined value in the size comparison unit 1601, the second selection unit 203
It is not determined whether or not it is less than or equal to the first threshold value. As described above, since it is not necessary to store the reception level information from the mobile station devices whose band allocation is smaller than the threshold value 5 in the memories 202b and 202c, the memory 202b and 202c are stored in the memories 202b and 202c as many as the band allocation. Set up.

Next, the operation of the radio apparatus having the above configuration will be described. First, the case where a received signal is received from the mobile station device will be described. The bandwidth allocation information of the mobile station device is input from the control unit 401 to the size comparison unit 1601. Based on the band allocation information input to the size comparison unit 1601, the size comparison unit 1601 determines whether or not the used bandwidth is equal to or greater than the preset threshold value 5, and the determination result is selected as the second selection. It is output to the unit 203. Based on the band allocation information input from the size comparison unit 1601, the reception level of the mobile station device whose bandwidth is smaller than the threshold value 5 in the size comparison unit 1601 is the first threshold value in the second selection unit 203. Whether or not the reception bandwidth of the mobile station apparatus whose used bandwidth is 5 or more in the magnitude comparison unit 1601 is less than or equal to the first threshold in the second selection unit 203 is not determined. Whether or not it is determined is performed, and the determination result is output from the second selection unit 203 to the magnitude comparison unit 204. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

Next, the operation of transmitting to the mobile station apparatus will be described. Based on the antenna selection information input from the antenna control unit 105 to the selection unit 102, the transmission signal input to the selection unit 102 is transmitted to the mobile station device whose use bandwidth is 5 or more in the size comparison unit 1601. Antenna 101 is selected and transmitted only when transmitting to a mobile station apparatus whose used bandwidth is less than threshold value 5 in magnitude comparison section 1601.
No selection of 1 is made. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

As described above, according to the radio apparatus of this embodiment, it is determined whether or not only the reception level in the reception level information of the mobile station apparatus with a large band allocation is equal to or lower than the first threshold value, and antenna 101 Is selected, it is possible to achieve both throughput of the entire system and simplification of processing.
Further, with respect to the mobile station device having a large used bandwidth, it is possible to prevent the error rate from deteriorating and to reduce the power consumption of the wireless unit. Further, since only the reception level information of the mobile station device with a large bandwidth allocation needs to be stored in the memories 202b and 202c, the number of memories 202b and 202c can be reduced.

The antennas may be switched only when receiving, and the same antenna may be used when transmitting, or the antennas may be switched in order regardless of the reception level and transmitted.

(Embodiment 12) FIG. 18 is a diagram showing the configuration of an antenna control unit according to Embodiment 12 of the present invention. In the present embodiment, the configuration of the wireless device is the same as that of FIG. 4, and therefore its explanation is omitted. Further, in the present embodiment, a maximum value detection unit 1701 is provided instead of the magnitude comparison unit 1601 of FIG. 17, and since the other configuration is the same as that of FIG. 17, the same reference numerals are given. The description is omitted.

Maximum value detecting section 1701 receives the band allocation information for each mobile station apparatus from control section 401, selects the mobile station apparatus having the maximum used band among them, and selects the selection result as the second selection. It is output to the unit 203.

Next, the operation of the radio apparatus having the above configuration will be described. First, the case where a received signal is received from the mobile station device will be described. The bandwidth allocation information of the mobile station device is input from the control unit 401 to the maximum value detection unit 1701. Based on the band allocation information input to the maximum value detecting unit 1701, the mobile station device having the largest used band is selected, and the selection result is output to the second selecting unit 203. Based on the band allocation information input from the maximum value detection unit 1701, the reception level of the mobile station device that is not the maximum used bandwidth among the mobile station devices that are currently communicating is the second selection unit 203.
It is not determined whether or not the received signal level is equal to or less than the first threshold value, and the reception level of the mobile station device having the maximum used bandwidth is the second value.
The selection unit 203 of 1 determines whether or not it is equal to or less than the first threshold value, and the determination result is output from the second selection unit 203 to the magnitude comparison unit 204. Note that the other operations are the same as those in the second embodiment, and therefore their explanations are omitted.

Next, the operation of transmitting to the mobile station apparatus will be described. In the case where the transmission signal input to the selection unit 102 is transmitted to the mobile station apparatus having the maximum used bandwidth in the maximum value detection unit 1701 based on the antenna selection information input from the antenna control unit 105 to the selection unit 102. Only the antenna 101 is switched and transmitted, and the maximum value detection unit 1701
In the case of transmitting to the mobile station device whose used bandwidth is less than the threshold value, the antenna 101 is not switched. Note that the other operations are the same as those in the second embodiment, and therefore their explanations are omitted.

As described above, according to the radio apparatus of this embodiment, it is determined whether or not only the reception level in the reception level information of the mobile station apparatus with the maximum band allocation is equal to or less than the first threshold value. Since 101 is switched, it is possible to achieve both throughput of the entire system and simplification of processing. Further, with respect to the mobile station device having the maximum used bandwidth, it is possible to prevent the error rate from deteriorating and to reduce the power consumption of the wireless unit. In addition, only the reception level information of the mobile station device having the maximum bandwidth allocation is stored in the memories 202b and 20b.
2c, so that the memory 202b, 202c
Can be reduced.

Note that the antennas may be switched only when receiving, and the same antenna may be used when transmitting, or the antennas may be switched in order regardless of the reception level for transmission.

(Embodiment 13) In this embodiment, the configuration of the radio apparatus is the same as that of FIG. 4, and therefore its explanation is omitted. In addition, in the present embodiment, FIG.
17 is different from the eleventh embodiment in that the information from the control unit 401 input to the magnitude comparison unit 1601 is the reception level, and since the other configurations are the same as those in FIG. 17, FIG. 17 is used. And the description of the configuration is omitted.

Control section 401 outputs the RSSI information for each mobile station apparatus stored in the memory to size comparison section 1601. The magnitude comparison unit 1601 determines whether the RSSI information input from the control unit 401 is less than or equal to a predetermined value set in advance, and when the RSSI information is less than or equal to the predetermined value, the mobile station device information is set as the second selection unit 203. Output to. The second selection unit 203, based on the mobile station device information input from the size comparison unit 1601, only the reception level in the reception level information of the mobile station device whose reception level in the size comparison unit 1601 is a predetermined value or more. , The received level information of the antenna 101 below the first threshold value is selected and output to the magnitude comparison unit 204. In this way, the reception level information of the mobile station device whose reception level is lower than the predetermined value is stored in the memories 202a to 20a.
2d does not need to be stored in the memories 202b and 202c as many as the number of mobile station devices whose reception level is higher than a predetermined value.
To provide.

Next, the operation of the radio apparatus having the above configuration will be described. First, the case where a received signal is received from the mobile station device will be described. Reception level information of the mobile station device is input to the magnitude comparison unit 1601 from a control unit (not shown). Based on the reception level information input to the size comparison unit 1601, the size comparison unit 1601 determines whether or not the reception level is equal to or higher than a predetermined value set in advance, and the determination result is the second selection unit 203. Output to. Based on the mobile station device information input from the size comparison unit 1601, the reception level of the mobile station device whose reception level is smaller than the predetermined value in the size comparison unit 1601 is the second selection unit 2
It is not determined in 03 whether the received level is equal to or lower than the first threshold value, and the received level of the mobile station apparatus whose received level is equal to or higher than the predetermined value in the magnitude comparison section 1601 is the second selected section 20
3, it is determined whether or not it is equal to or less than the first threshold value, and the determination result is output from the second selection unit 203 to the magnitude comparison unit 204. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

Next, the operation of transmitting to the mobile station apparatus will be described. The transmission signal input to the selection unit 102 is transmitted to the mobile station device whose reception level is greater than or equal to a predetermined value in the size comparison unit 1601 based on the antenna selection information input from the antenna control unit 105 to the selection unit 102. Only when the antenna 101 is switched and transmitted, the size comparison unit 16
When transmitting to the mobile station device whose reception level is less than the predetermined value in 01, the antenna 101 is not switched. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

As described above, according to the radio apparatus of this embodiment, the antenna switching is not performed for the mobile station apparatus of which sufficient quality is obtained without performing the antenna switching. It is possible to achieve simplification of processing at the same time without reducing the overall throughput. Further, with respect to the mobile station device that cannot obtain sufficient quality, it is possible to prevent the error rate from deteriorating and reduce the power consumption of the receiving unit 103 and the transmitting unit 107. Further, since only the reception level information of the mobile station device having the reception level equal to or higher than the predetermined value needs to be stored in the memories 202b and 202c, the number of the memories 202b and 202c can be reduced.

In this embodiment, the magnitude comparison unit 1601 determines whether or not the reception level is equal to or higher than a predetermined value. However, whether or not the digitized line quality other than the reception level is equal to or higher than the predetermined value. The same effect can be obtained by determining whether or not the mobile station device information is used. Further, the size comparison between the predetermined value and the reception level in the size comparison unit 1601 is
Whether to compare for each frame of the received signal or to compare using the averaged reception level for a plurality of frames,
Either method may be used.

(Fourteenth Embodiment) FIG. 19 is a diagram showing the structure of the antenna control unit according to the fourteenth embodiment of the present invention. In this embodiment, the configuration of the wireless device is the same as that in FIG. 1, and therefore its explanation is omitted. Further, in the present embodiment, the configuration in which delay section 1801 is provided is different from that in FIG. 2 and the other configurations are the same as those in FIG. 2, so the same reference numerals are given and their description is omitted.

Delay section 1801 delays the reception level information input from magnitude comparison section 204 by one frame of the received signal and outputs it to selection section 105. When the fluctuation of the reception level is sufficiently slow with respect to the frame period of the reception signal, even if the selection of the antenna 101 is delayed by one frame, the deterioration of the reception quality is small.

Next, the operation of the radio apparatus having the above configuration will be described. From the size comparison unit 204 to the delay unit 1801
The reception level information input to is output to the selection unit 105 as antenna selection information after being delayed by one frame. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

As described above, according to the radio apparatus of this embodiment, delay section 1801 delays and outputs antenna selection information by one frame, so that an antenna is selected in real time for reception level information. Compared with the case, the timing control and the like are simplified, and the processing of the received signal can be simplified.

In this embodiment, the delay unit 1
Although 801 is delayed by one frame, it may be delayed by two frames or more depending on the speed of fluctuation of the reception level.

(Embodiment 15) FIG. 20 is a diagram showing the configuration of a radio apparatus according to Embodiment 15 of the present invention. In the present embodiment, the counter 1901 and the selection unit 1
The configuration in which 902 is provided is different from that in FIG. 4, and the other configurations are the same as those in FIG.

The counter 1901 counts at the frame cycle and outputs the count number to the selection unit 1902. The selection unit 1902 determines which channel the received signal received by the antenna 101 is based on the channel information input from the control unit 401, and a plurality of mobile station devices such as a control channel and a multicast channel. Is a common channel, the selection unit 10 selects the antenna selection information for periodically selecting the antenna 101.
Output to 2. On the other hand, when the selection unit 1902 determines based on the input channel information that the channel is not shared by a plurality of mobile station devices, the reception level of the antenna 101 is equal to or less than the first threshold value. The antenna selection information is selected and output to the selection unit 102.

Next, the operation of the radio apparatus having the above configuration will be described. The counter 1901 counts in a frame cycle and outputs the count number to the selection unit 1902. On the other hand, when the channel information input to the selection unit 1902 is a channel commonly used by a plurality of mobile station devices, the selection unit 1902 periodically transmits from each antenna 101 based on the counter output information of the counter 1901. The antenna selection information is output to the selection unit 102. When the channel information input to the selection unit 1902 is not a channel commonly used by a plurality of mobile station devices, the selection unit 1902 selects the antenna selection information of the antenna 101 having the reception level equal to or lower than the first threshold value. Output to 102. Note that the other operations are the same as those in the second embodiment, and therefore their explanations are omitted.

As described above, according to the radio apparatus of this embodiment, when transmitting a transmission signal on a channel common to a plurality of mobile station apparatuses, a plurality of antennas 101 are simultaneously provided to the plurality of mobile station apparatuses. Since the transmission signals are transmitted in order from, it is possible to prevent a mobile station apparatus in which the state of poor channel quality continues.

(Embodiment 16) FIGS. 21 and 22 show
It is a figure which shows the antenna control part which concerns on Embodiment 16 of this invention, and the frame format of a signal. In the present embodiment, the configuration of the wireless device is the same as that of FIG. 4, so description thereof will be omitted. In addition, in the present embodiment, the configuration in which the delay unit 2001 is provided and the configuration in which the timing of the timing signal of the guard interval 2105 is input from the control unit 401 to the first selection unit 201 are different from those in FIG. Since the configuration is the same as that of FIG. 2,
The same reference numerals are given and the description thereof is omitted.

In general, unlike the downlink from the base station apparatus to the mobile station apparatus, the uplink from the mobile station apparatus to the base station apparatus is not always transmitted at a constant cycle. Therefore, it is difficult to stop the operation of AGC or synchronization only in a specific frame and switch the antenna to the area of AGC or synchronization preamble as in the downlink. That is, when the antennas are switched to the AGC or synchronization preamble area, there arises a problem that the AGC or the synchronization pull-in characteristic is deteriorated. In the present embodiment, attention is paid to the fact that the guard interval of the propagation path estimation preamble of the multimedia mobile access (hereinafter referred to as “MMAC”) standard is set longer than the guard interval of the message. The antennas are switched at the guard interval of the propagation path estimation preamble.

Delay section 2001 delays the antenna selection information input from magnitude comparison section 204 by the period of the guard interval of the propagation path estimation preamble and outputs it. The timing of the guard interval 2105 of the channel estimation preamble is input to the first selection unit 201 from the control unit 401.

Next, the frame format of the received signal will be described. As shown in FIG. 22, the received signal includes a message guard interval 2101 and data 210.
2, synchronization preamble 2103, signal area 2104,
Preamble guard interval 210 for channel estimation
Preamble for channel estimation 2 consisting of 5 and 2 symbols
And 106. The message guard interval 2101 and the propagation path estimation preamble guard interval 2105 are obtained by adding the same signal as a part of the latter half of the symbol to the first half of the symbol on the transmitting side so as not to be affected by distortion due to multipath. The synchronization preamble 2103 is added for synchronizing the transmitting side and the receiving side. Signal area 2104
Is a polarity inversion of the synchronization preamble 2103 inserted immediately after the synchronization preamble 2103,
It is used for synchronization detection control and not for synchronization pull-in. The propagation path estimation preamble 2106 is included in each subcarrier, and is used when the receiving side restores the phase and amplitude distorted due to multipath or the like to the original state. The channel estimation preamble guard interval 2105 has a length twice that of the message guard interval 2101 and is not used for channel estimation. Therefore, the antenna 101 can be switched in the area of the guard interval 2105 of the propagation path estimation preamble.

Next, the operation of the radio apparatus having the above configuration will be described. The reception level information input to the first selection unit 201 is the memory 202a to 202 selected by the first selection unit 201 at the timing of the timing signal of the guard interval 2105 input to the first selection unit 201.
It is stored in d and is output from the memories 202a to 202d to the second selection unit 203. It is determined whether the reception level in the reception level information input to the second selection unit 203 is less than or equal to the first threshold value. If the reception level is less than or equal to the first threshold value, the second It is output from the selection unit 203 to the magnitude comparison unit 204. In the reception level information output from the second selection unit 203 to the magnitude comparison unit 204, the reception level of the antenna 101 having the maximum reception level is selected, output to the delay unit 2001, and the delay unit 2001 estimates the propagation path. The antenna selection information is output to the selection unit 102 at the timing of the preamble guard interval 2105, and the antenna 101 is switched during the guard interval 2105. The other operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

As described above, according to the radio apparatus of the present embodiment, antenna switching can be performed even in the uplink without deteriorating AGC and sync pull-in characteristics. In addition, the deterioration of the error rate can be prevented, and the receiving unit 10
3 and the power consumption of the transmission unit 107 can be reduced.

In the present embodiment, the MMAC
Although the present invention is applied to the transmission signal according to the standard, it is not limited to the case of the transmission signal according to the MMAC standard, and can be applied to any case where communication is performed with the transmission signal having the same frame format.

(Embodiment 17) In the present embodiment, the configuration for performing antenna switching also in signal area 2104 is different from that in the sixteenth embodiment, and the configuration of the radio apparatus, the configuration of the antenna control apparatus, the frame Since the format configuration and these operations are the same as those in the sixteenth embodiment, description thereof will be omitted.

In the present embodiment, the signal area 210
4 is not used for the synchronization pull-in, and the signal area 2
The antenna 101 is switched in a continuous region of the channel 104 and the guard interval 2105 of the channel estimation preamble.

As described above, according to the radio apparatus of this embodiment, in addition to the effects of Embodiment 16 described above, the signal area 2
Since 104 is also used for antenna switching, the antenna 10
Even when the number of 1's is large, the antenna 101 can be switched without deteriorating the AGC and the sync pull-in characteristic.

(Embodiment 18) In this embodiment, the configuration for performing antenna switching even for one symbol of the channel estimation preamble is different from that of the seventeenth embodiment, and the configuration of the radio apparatus and the antenna control are different. The configuration of parts, the configuration of the frame format, and the operations thereof are the same as those in the seventeenth embodiment, and the description thereof will be omitted.

In the present embodiment, attention is paid to the fact that two symbols are included in propagation path estimation preamble 2106, and one symbol of propagation path estimation preamble 2106 is also used for antenna switching. Therefore,
Signal region 2104, channel estimation preamble guard interval 2105, and channel estimation preamble 2
Antenna switching can be performed in a continuous area of 106 1 symbol.

As described above, according to the radio apparatus of the present embodiment, in addition to the effect of Embodiment 16 described above, one symbol of propagation path estimation preamble 2106 is also used for antenna switching, so that the number of antennas 101 is reduced. Even if the number is large, the antenna 1
01 can be switched.

Incidentally, the above-mentioned first to first embodiments
Although the wireless device described in 8 has been described as applied to the base station device, it can also be applied to the mobile station device. In addition, in the radio apparatus according to any of Embodiments 1 to 18, second selection section 203 selects an antenna whose reception level is less than or equal to a first threshold value or greater than or equal to a second threshold value. However, whether or not to select an antenna having a reception level equal to the first threshold value or the second threshold value is arbitrary.

[0150]

As described above, according to the present invention,
It is possible to prevent the deterioration of the error rate characteristic and reduce the power consumption of the receiving unit and the transmitting unit.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a wireless device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an antenna control unit according to the first embodiment of the present invention.

[Fig. 3] Graph of error rate characteristics

FIG. 4 is a block diagram showing a configuration of a wireless device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an antenna control unit according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a wireless device according to a third embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of an antenna control unit according to a third embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a delay dispersion generator according to Embodiment 3 of the present invention.

FIG. 9 is a block diagram showing a configuration of an antenna control unit according to a fourth embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a delay dispersion generator according to Embodiment 4 of the present invention.

FIG. 11 is a block diagram showing a configuration of an antenna control unit according to a fifth embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of an antenna control unit according to a sixth embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration of a wireless device according to Embodiment 7 of the present invention.

FIG. 14 is a block diagram showing a configuration of an antenna control unit according to a seventh embodiment of the present invention.

FIG. 15 is a block diagram showing a configuration of an antenna control unit according to an eighth embodiment of the present invention.

FIG. 16 is a block diagram showing a configuration of an antenna control unit according to a ninth embodiment of the present invention.

FIG. 17 is a block diagram showing a configuration of an antenna control unit according to an eleventh embodiment of the present invention.

FIG. 18 is a block diagram showing the configuration of an antenna control unit according to Embodiment 12 of the present invention.

FIG. 19 is a block diagram showing a configuration of an antenna control unit according to a fourteenth embodiment of the present invention.

FIG. 20 is a block diagram showing the configuration of a radio apparatus according to Embodiment 15 of the present invention.

FIG. 21 is a block diagram showing a configuration of an antenna control unit according to Embodiment 16 of the present invention.

FIG. 22 is a diagram showing a frame format according to Embodiment 16 of the present invention.

[Explanation of symbols]

101 antenna 102 Selector 105 Antenna control unit 201 First selection unit 202 memory 203 Second selection unit 204 Large and small comparison section

Claims (22)

[Claims] 1. A judging means for judging whether or not a reception level of a reception signal received by a plurality of antennas is below a first threshold value, and an antenna whose reception level is below the first threshold value. A radio apparatus comprising: a selecting unit for selecting and a demodulating unit for demodulating a received signal from the antenna selected by the selecting unit. 2. The radio apparatus according to claim 1, wherein the first threshold value can be changed by a modulation method. 3. The radio apparatus according to claim 1, wherein the first threshold value can be changed by a delay time between received signals detected by the delay time detecting means. 4. The radio apparatus according to claim 3, wherein the first threshold value can be changed by a value obtained by dividing the delay time by the reception level of the antenna selected by the selecting means. 5. The selecting means does not select an antenna until the reception level of the currently selected antenna becomes less than a second threshold value that is smaller than the first threshold value. The wireless device according to any one of claims 1 to 4. 6. A radio apparatus, comprising: selecting means for selecting one of the antennas on both sides of the currently selected antenna next to the currently selected antenna regardless of the reception level. 7. An antenna, a plurality of antennas, error detection means for detecting an error in a received signal received by the antenna, and error information from the error detection means when the error detection means detects an error in the received signal. In addition, the wireless device, comprising: selecting means for selecting an antenna selected before the currently selected antenna when the error information is received. 8. A counter for counting the number of errors detected by the error detecting means, and an error number determining means for determining whether or not the total number of the error numbers counted by the counter is equal to or more than a predetermined value. 8. The error information is output to the selecting means when the error number determining means determines that the total number exceeds a predetermined value. Wireless device. 9. The antenna selected by the selecting means receives a transmission signal from one mobile station apparatus, converts it into a reception signal, and transmits the transmission signal to the same mobile station apparatus. The wireless device according to any one of claims 1 to 8. 10. The selecting device according to claim 1, wherein the selecting means selects a plurality of antennas in order and transmits them to a plurality of partners simultaneously on a common channel.
The wireless device according to any one of 1. 11. When the communication is performed by a plurality of modulation methods at the same time, the selecting means selects an antenna to be used for communication with a partner who communicates by the multilevel modulation method. 11. The wireless device according to claim 10. 12. When performing simultaneous communication in a continuous reception mode and an intermittent reception mode, the selecting means selects an antenna used for communication with a partner with whom the communication is performed in the intermittent reception mode. The wireless device according to any one of claims 1 to 11. 13. When the communication is performed simultaneously with a plurality of parties having different use bandwidths, the selecting means selects an antenna used for communication with a party having a use bandwidth larger than a predetermined value. The wireless device according to any one of claims 1 to 12. 14. When the communication is performed simultaneously with a plurality of parties having different used bandwidths, the selecting means selects an antenna used for communication with the party having the largest used bandwidth. 14. The wireless device according to claim 13. 15. The selecting unit selects R from a plurality of opponents.
The antenna used for communication with a communication partner whose SSI is equal to or greater than a predetermined value is selected.
5. The wireless device according to any one of 4 above. 16. The radio apparatus according to claim 1, wherein the selecting unit selects the antenna after delaying the received signal by one frame or more by the delay unit. 17. The reception signal has a guard interval of a propagation path estimation preamble, and the selection means comprises:
The radio device according to any one of claims 1 to 16, wherein an antenna is selected during the guard interval period. 18. The reception signal has a signal region in which the polarities of a guard interval of a propagation path estimation preamble and a synchronization preamble are inverted, and the selecting means has an antenna during a period of the guard interval and the signal region. 16. The method according to claim 1, wherein
The wireless device according to any one of 1. 19. The reception signal has a guard interval of a propagation path estimation preamble, a signal area in which the polarity of a synchronization preamble is inverted, and a two-symbol propagation path estimation preamble, and the selecting means comprises the guard means. 17. The radio apparatus according to claim 1, wherein an antenna is selected during an interval, the signal region, and one symbol period of the propagation path estimation preamble. 20. A mobile station device comprising the wireless device according to claim 1. 21. A base station device comprising the wireless device according to claim 1. Description: 22. A reception level measuring step of measuring reception levels of reception signals received by a plurality of antennas, and determining whether or not the reception level measured by the reception level measuring step is less than or equal to a first threshold value. A receiving method comprising: a determining step to be performed; and a selecting step of selecting an antenna whose reception level is equal to or lower than the first threshold value.