JP3037327B1 - Wireless communication device and transmission output control method - Google Patents

Abstract

A wireless communication apparatus capable of reducing the influence on adjacent lines when fading occurs, reducing the diffraction between antennas due to the level difference in the same station in a multi-hop system configuration, reducing the steady power consumption, and the like. A transmission output control method is provided. A radio communication apparatus includes a bit error counter for counting the number of bit errors output from a demodulator for demodulating an output of a receiver, an intersymbol interference component included in an output of the demodulator. Transversal equalizer 7 for equalizing
And a tap coefficient counter 11 for counting tap coefficients of the transversal type equalizer 7, and spatial transmission based on the tap coefficient counted by the tap coefficient counter 11 and the number of bit errors counted by the bit error number counter 10. An output control unit 8 that determines the state of the road and controls the transmission output of the transmitter 2 according to the determination result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication apparatus and a transmission output control method, and more particularly to a radio communication apparatus and a transmission output control method suitable for suppressing unnecessary increase in transmission output level.

[0002]

2. Description of the Related Art Conventionally, various transmission output control systems in a wireless communication apparatus have been proposed. As a conventional transmission output control method, for example, as described in JP-A-3-127519, a reception input level of a receiver is detected and transmitted to a transmission side through a transmission path, and transmission output is controlled by reception input level detection information. System, for example, Japanese Patent Laid-Open No. 4-167736
As described in Japanese Patent Application Laid-Open Publication No. H11-260, the reception input level of the receiver is detected and the number of bit errors detected by the demodulator is counted and sent to the transmission side through the transmission path. There is a method of controlling transmission output.

[0003] As a conventional example of the above-mentioned transmission output control, for example, a technique described in Japanese Patent Application Laid-Open No. 64-16149 has been proposed. The gazette aims to make it possible to accurately control transmission power in consideration of the line quality, and to adjust the reception level of the receiver group for a plurality of all line outputs of the same system. A determination circuit; a circuit for determining a bit error rate of a parity included in each reception signal from the receiver group; and a circuit for generating a transmission power control signal when outputs of both determination circuits satisfy a predetermined condition. A transmission power control method is disclosed, which is provided in a station, and controls the transmission power from the transmitter of the reception station to the transmission station so as to reduce the transmission power for all lines by the output of the control signal generation circuit.

As another conventional example related to the above-mentioned transmission output control, a technique described in, for example, Japanese Patent Application Laid-Open No. Hei 4-25223 has been proposed. This publication aims at preventing both polarizations due to fading or the like from deteriorating the cross polarization discrimination degree, and discloses an automatic gain control amplifier provided in each of the first and second receiving units. A transmission power control method comprising: a reception level determination circuit for comparing an automatic gain control voltage to determine an automatic gain control voltage having a higher reception level and inputting control information corresponding to the determination to a transmitter. Is disclosed.

As another conventional example related to the above-described transmission output control, for example, a technique described in Japanese Patent Application Laid-Open No. 8-56186 has been proposed. This publication aims to demodulate data at a low bit error rate even during reception under a situation with a lot of distortion, and has the same pattern as known pattern data included in transmission data transmitted on a transmission path. Pattern generating means for generating data, correlation detecting means for sequentially detecting the correlation between the received data received via the transmission path and the pattern data as a correlation value, and the like for the received data based on the correlation value. There is disclosed a transmission device comprising: a signal processing unit that varies the number of taps of an adaptive filter used for the conversion process and demodulates the received data using the adaptive filter after the variation.

[0006]

However, the above-described prior art has the following problems.

In the conventional example described in Japanese Patent Application Laid-Open No. 3-127519, level compensation by fading (radio wave attenuation caused by spatial variation of the transmission path) generated on the spatial transmission path is higher or lower than a set reception level threshold. Since the transmission output level control is performed only by using the bit error rate, it is not possible to correct the variation of the bit error rate characteristics due to the characteristics of the demodulator and the transmitter constituting the system.

Further, in the conventional example described in Japanese Patent Application Laid-Open No. 4-167736, the variation of the bit error rate characteristic due to the characteristics of the demodulator and the transmitter constituting the system is made by using the number of bit errors as a parameter for transmission control. Although it can be corrected, the transmission output may increase to the saturation region of the transmitter when bit errors continue to appear due to waveform distortion due to selective fading, which may affect other lines There is.

An object of the present invention is to reduce the influence on adjacent lines when fading occurs, to reduce the diffraction between antennas due to the level difference in the same station when a plurality of transmission / reception sequences (multi-stage hop) are configured, and to reduce the steady power consumption. An object of the present invention is to provide a wireless communication device and a transmission output control method capable of realizing a reduction or the like.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a radio communication apparatus for controlling the transmission output of a transmitter based on the state of a spatial transmission path. comprising a case where the road fading occurs, and if the deep fades in the space transmission path is generated, the output control means for controlling the transmission output of the transmitter in response to each case of fading can be exemplified, further
Receiving the transmission output of the transmitter via the spatial transmission path.
Output from the demodulating means for demodulating the output of the receiving receiver
Bit error number counting means for counting the number of bit errors,
Equalize the intersymbol interference component included in the output of the demodulator
Tapping means for counting tap coefficients of the equalizing means
Number counting means, and the output control means
The number of bit errors counted by the
Based on the tap coefficient counted by the tap coefficient counting means.
Determine whether the state of the spatial transmission path is any of the above cases
Control the transmission output of the transmitter according to the determination result.
Characterized in that that.

The radio communication apparatus according to the present invention, which will be described with reference to FIG. 1, controls a transmission output of a transmitter based on a state of a spatial transmission path. In the case of (1), when fading occurs in the spatial transmission path, output control means (8 in FIG. 1) for controlling the transmission output of the transmitter according to each case in which deep fading occurs in the spatial transmission path. I have it.

Also, a bit error number counting means (10 in FIG. 1) for counting the number of bit errors output from a demodulation means (6 in FIG. 1) for demodulating the output of the receiver, The output control means, comprising: an equalizing means (7 in FIG. 1) for equalizing an intersymbol interference component included therein; and a tap coefficient counting means (11 in FIG. 1) for counting tap coefficients of the equalizing means. (8 in FIG. 1) is any of the above-mentioned cases of the state of the spatial transmission path based on the bit error number counted by the bit error number counting means and the tap coefficient counted by the tap coefficient counting means. And the transmission output of the transmitter is controlled in accordance with the result of the determination.

[Operation] In the radio communication apparatus of the present invention, when the output control means controls the transmission output of the transmitter, the output control means controls the reception input level information when the reception spectrum is in a normal state and the fading. The control operation is performed based on the bit error number counting information when it occurs in the spatial transmission path and the tap coefficient determination information.

Thus, when frequency-selective fading occurs on the spatial transmission path, the output control means uses the judgment information signal of the output of the tap coefficient counting means based on the bit error number counting information output from the bit error number counting means. To stop the control for increasing the unnecessary output level of the transmitter. By not performing transmission output increase control that cannot improve the bit error rate when fading occurs,
Reduces the effect on adjacent lines, which was caused by fading in the conventional method, and multiple transmission / reception sequences (multi-hop)
Reduction of diffraction between antennas and reduction of steady-state power consumption due to a level difference in the same station at the time of system configuration can be realized by suppressing unnecessary increase in transmission output level.

In addition, the present invention relates to a radio communication system for controlling a transmission output of a transmitter in microwave radio communication in accordance with a reception input level detected on a reception side and the number of bit errors at a demodulation point. The state of the spatial transmission path is determined based on the information obtained by counting the tap coefficients of the equalizing means connected to the output, and the transmission output on the transmission side is controlled. In terms of performing such control, Japanese Patent Laid-Open Publication No.
9 and Japanese Patent Application Laid-Open No. 4-167836, and the above-mentioned Japanese Patent Application Laid-Open No. 64-16149 and Japanese Patent Application Laid-Open No.
This is fundamentally different from the conventional examples described in JP-A-5223 and JP-A-8-56186.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

(1) Description of Configuration FIG. 1 is a block diagram showing a configuration of a wireless communication apparatus according to an embodiment of the present invention. In FIG. 1, a wireless communication apparatus according to an embodiment of the present invention includes a modulator 1, a transmitter 2, antennas 3, 4,
Receiver 5, demodulator 6, transversal equalizer 7, output controller 8, level detector 9, bit error counter 1
0, a tap coefficient counter 11 and a transmission line 12 are provided.

The spatial transmission path refers to a transmission path between the antennas 3 and 4, for example, between base stations arranged in microcells and macrocells, between a base station and a mobile phone, and the like. A public telephone line, a dedicated line, or an ISDN line is used as a transmission line 12 between stations, and a spatial transmission line is used as a transmission line 12 between a base station and a mobile station. A spatial transmission path of a control system radio wave slightly different in frequency from the signal system radio wave to be used is used.

FIG. 2 is a block diagram showing a detailed configuration of the tap coefficient counter 11 of the wireless communication apparatus according to the embodiment of the present invention shown in FIG. In FIG. 2, the tap coefficient counter 11 of the wireless communication device according to the embodiment of the present invention includes a tap coefficient weighting circuit 11a, a tap coefficient integrating circuit 11b, and a threshold value determining circuit 11c.

To describe the above configuration in detail, the modulator 1 modulates data input from an input terminal. Transmitter 2
The transmission output is sent to the transmission antenna 3. The receiver 5 receives a signal via the receiving antenna 4. The demodulator 6 receives the intermediate frequency signal output from the receiver 5 and performs demodulation into a baseband and analog-to-digital conversion. The transversal equalizer 7 is an equalizer for improving the occurrence of code errors. The transversal equalizer 7 receives a demodulated data signal of the demodulator 6 as an input, and converts an intersymbol interference component included in the input demodulated data signal into a transversal filter (input). After branching and multiplying by an appropriate coefficient,
(A filter that determines the filter characteristics by adding), and outputs the equalized signal to an output terminal.

The output control unit 8, as described in detail below,
The transmission output of the transmitter 2 is controlled to a level suitable for a spatial transmission path. The level detector 9 detects the level of the receiver 5 on the receiving side. The bit error counter 10 counts the number of bit errors output from the demodulator 6. Tap coefficient counter 1
1 counts forward and backward tap coefficients output from the transversal equalizer 7 having tap coefficient outputs.

The tap coefficient weighting circuit 11a weights a large one of the forward tap coefficient and the backward tap coefficient output from the transversal type equalizer 7 that fluctuates greatly with respect to fading, and then performs weighting. And outputs a signal to the tap coefficient integration circuit 11b. The tap counting and integrating circuit 11b calculates an average value for a certain period of time, and outputs a signal based on the average value calculation to the threshold value determination circuit 1
1c. The threshold value determination circuit 11c outputs a tap coefficient determination information signal to the output control unit 8 when the average value exceeds the threshold value.

The output control unit 8 includes a level information signal of a level detector 9 for detecting the level of the receiver 5 on the receiving side and a bit error number counter 10 for counting the number of bit errors output from the demodulator 6. The input of the count information and the tap coefficient determination information signal output from the tap coefficient counter 11, and the transmitter 2 transmitting from the transmitting antenna 3 based on the modulation output of the modulator 1 for modulating the data input from the input terminal. The transmission output is controlled to a level suitable for the spatial transmission path.

The modulator 1, the transmitter 2, the receiver 5, the demodulator 6, the transversal type equalizer 7, the level detector 9, and the bit error counter 10 shown in FIG. 1 are well known to those skilled in the art. The detailed configuration is omitted.

(2) Description of Operation Next, the operation of the embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 3 shows a CDMA (Code Division Mu) for improving the noise and interference wave rejection rate by widening the band with a spreading code.
FIG. 3 is a diagram illustrating a state in which the spectrum of a signal input to the receiver 5 according to the ltiple access method changes due to fading or the like generated on a spatial transmission path of microwave wireless communication. (A) shows a reception spectrum input to the receiver 5 when the spatial transmission path is in a normal state. (B) shows a state in which fading has occurred in the spatial transmission path, the reception level of the input of the receiver 5 has dropped, and the reception spectrum has undergone waveform distortion. (C) shows a state in which deep fading has occurred in the spatial transmission path, the reception level of the receiver 5 has also decreased, and the spectrum has undergone significant waveform distortion due to fading.

First, a method of determining whether or not fading has occurred using the tap coefficients of the transversal equalizer 7 will be described. When fading occurs, the tap coefficient of the transversal equalizer 7 has a large forward or backward tap coefficient due to the operation of the transversal filter due to occurrence of large intersymbol interference. However, when equalization of intersymbol interference is sufficiently performed, FIG.
In the spectrum in the state (b), the error signal as the equalization residual has a small value. However, in the case of the spectrum in the state as shown in FIG. 3C, the intersymbol interference increases, the equalizer operates close to the limit, and the equalization capability reaches the limit, and equalization cannot be performed. The threshold value judging circuit 11b of the tap coefficient counter 11 detects a state in which both the front and rear tap coefficients are larger than the threshold value as a tap coefficient judgment information signal.

Next, how to control the transmission output based on each judgment output will be described. FIG. 4 shows that the transmitter 2 on the transmitting side is controlled by the output control unit 8 according to the reception state of the reception spectrum shown in FIG.
FIG. 3 is a diagram showing how the control is performed by the control. FIG.
The column of the output of the bit error counter of
Indicates that bit errors greater than or equal to the threshold are counted,
"No error count" indicates a bit error equal to or less than a certain threshold value. `` Counted '' in the tap coefficient counter output column indicates that the tap coefficient has changed so much that it exceeds the threshold value, and that deep fading that cannot be equalized on the spatial transmission path has occurred, "No counting" indicates that there is no large variation in which the tap coefficient exceeds the threshold value, and indicates that fading has occurred within a range that can be sufficiently equalized by the equalizer, or that no fading has occurred. ing.

FIG. 5 is a diagram showing the received input level versus the bit error rate when the signal in the state shown in FIG. 3 is received. The bit error characteristic when the spectrum in the normal state shown in FIG. 3A is received is denoted by S1, and the bit error characteristic when the spectrum in which fading occurs as shown in FIG. 3B is caused by the frequency distortion of the received spectrum. A characteristic indicating a slightly deteriorated state is defined as S2, and a characteristic whose bit error characteristic is greatly deteriorated due to waveform distortion when a spectrum in which deep fading has occurred as shown in FIG.

The transmission output control method according to the embodiment of the present invention is as follows.
When the receiver 5 is receiving the reception spectrum shown in FIG. 3A, the output controller 8 controls the transmitter 2 based on the reception input level information of the receiver 5 detected by the level detector 9.
Control the transmission output of the That is, when the reception input level is high, the transmission output of the transmitter 2 is reduced, and when the reception input level is low, the output control unit 8 that increases the transmission output performs the output control in the state (a) of FIG.

When the receiving spectrum in the state shown in FIG. 3B is received by the receiver 5, the level information detected by the level detector 9 and the bit count information counted by the bit error counter 10 are used as shown in FIG. The output control unit 8 operates as in the state (b). That is, the output control unit 8 increases the transmission output based on the level information based on the reception level decrease. In addition, due to a bit error in the demodulator 6 caused by a deterioration in the ratio of noise to signal level in the analog signal portion due to waveform distortion due to fading, the transmission output is determined based on the count information from the bit error counter 10. Increase.

This operation will be described with reference to the bit error characteristic of FIG. 5. The bit error rate characteristic becomes like S2 due to waveform distortion due to fading, and a bit error occurs at the standard reception input level r, but the reception level is increased. Improves the bit error rate. This is because, in the case of the reception spectrum shown in FIG. 3B, the bit error rate is improved because the bit error due to the lower reception level is more dominant than the bit error due to the waveform distortion.

When the receiver 5 receives the reception spectrum in the state as shown in FIG. 3C, the bit error rate characteristic of the demodulator 6 is changed to that of S3 in FIG. In this state, even if the output of the transmitter 2 is controlled so as to increase the reception level, the waveform distortion is dominant, so that the bit error rate characteristics are not improved. At this time, the output control unit 8 of the transmitter 2 uses the determination information signal output from the tap coefficient counter 11 to count and determine the tap coefficients of the transversal equalizer 7 as shown in the state (c) of FIG. Stop transmission output control.

As described above, in addition to the output of the bit error number counter 10 for counting the number of bit errors in the output of the demodulator 6, the tap coefficient is input from the transversal equalizer 7 and the tap for counting the tap coefficient is input. By inputting two pieces of determination information of the output of the coefficient counter 11 to the output control unit 8 on the opposite transmission side via the transmission line, when deep fading occurs, the occurrence of fading is determined by the determination information of the output of the tap coefficient counter 11, The control to increase the output of the transmitter 2 based on the output information of the level detector 9 and the count information of the bit error counter 10 is operated to stop. By this control, unnecessary increase in the transmission output of the output of the transmitter 2 can be suppressed.

As described above, according to the embodiment of the present invention, the output control section 8 controls the transmission output of the transmitter 2 by controlling the output control section 8 such that the reception input level information when the reception spectrum is in a normal state. The control operation is performed based on bit error count information and tap coefficient determination information when fading occurs in a spatial transmission path.

As a result, when frequency selective fading occurs on the spatial transmission path, the output control unit 8 determines the bit error by the determination information signal of the output of the tap coefficient counter 11 as shown in the state (c) of FIG. The operation of increasing the useless output level of the transmitter 2 based on the bit error count information output from the number counter 10 is stopped. By not performing transmission power increase control that cannot improve the bit error rate when fading occurs, the effect on adjacent lines that was generated when fading occurred in the conventional method is reduced, and the level within the same station when a multi-stage hop system is configured There is an effect that reduction of diffraction between antennas and reduction of steady power consumption due to the difference can be realized by suppressing unnecessary increase in transmission output level.

[Second Embodiment] The basic structure of the second embodiment of the present invention is as described above. The transversal equalizer 7 shown in FIG. 1 is a linear equalizer. The same effect can be obtained regardless of whether it is a decision feedback equalizer. However, when a linear equalizer is used, the variable range of the transmission output level at the time of fading cannot be made as large as that of the decision feedback equalizer because the equalization ability is low.

As a second embodiment, as shown in FIG. 6, a configuration including a signal processor 13 connected to the output of the transversal type equalizer is included, and the bit error counter 10 shown in FIG. Instead of the output bit error count information of
Error pulse counter 1 for counting error pulses output from signal processor 13 at the subsequent stage of transversal type equalizer 7
4 through the transmission line 12 to output the output control unit 8
The same effect can be obtained even if the input is made to the input. The error pulse is counted by counting the number of pulses required for error correction within a predetermined period with respect to the bit error rate, thereby weighting the count value and controlling the transmission power in accordance with the state of the radio wave transmission path. .

In this case, the signal processor 13 receives the signal output from the transversal type equalizer 7 as input, establishes frame synchronization, extracts redundant bits, and corrects the error of the signal, and transmits the signal from the transmission side. The transmitted transmission data signal is reproduced.
In this error correction process, syndrome pulses (pulses for the presence or absence of error correction) corresponding to the number of errors in the data signal,
A parity pulse is generated. The counting information of the error pulse counter 14 for counting the pulses generated at the time of the data error is output to the output control unit 8.

As described above, according to the second embodiment of the present invention, even with the above configuration, the fading state of the spatial transmission path is determined by counting the tap coefficients of the transversal equalizer. As a result, unnecessary transmission output increase control due to a signal error that cannot be equalized and corrected by the signal processor 13 and the transversal equalizer 7 is stopped, and the object as the transmission output control method can be achieved.
Also, an increase in power consumption due to an increase in the transmitter output level can be prevented. Depending on how to set the threshold for counting error pulses and the threshold for counting tap coefficients, it is possible to increase the transmission output level to the extent that the system can tolerate nonlinear distortion of the transmitter and maximize the output control range. It becomes possible.

[0041]

As described above, according to the present invention,
When the transmission output of the transmitter is controlled by the output control means, the output control means includes reception input level information when the reception spectrum is in a normal state and bit error count information when fading occurs in the spatial transmission path. And the control operation is performed based on the tap coefficient determination information.

With this arrangement, when frequency selective fading occurs on the spatial transmission path, the output control means uses the determination information signal of the output of the tap coefficient counting means based on the bit error number counting information output from the bit error number counting means. To stop the control for increasing the unnecessary output level of the transmitter. By not performing transmission output increase control that cannot improve the bit error rate when fading occurs,
Unnecessary transmission output levels include the reduction of the influence on adjacent lines that occurred when fading occurred in the conventional method, the reduction of diffraction between antennas due to the level difference within the same station in a multi-stage hop system configuration, and the reduction of steady power consumption. There is an effect that it can be realized by suppressing the increase in

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a wireless communication device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a detailed configuration of a tap coefficient counter of the wireless communication device according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a change in a reception spectrum due to a fading state according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a reception input level versus a bit error rate according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating an operation of an output control unit of the wireless communication device according to the embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of a wireless communication device according to another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 modulator 2 transmitter 3, 4 antenna 5 receiver 6 demodulator 7 transversal equalizer 8 output controller 9 level detector 10 bit error counter 11 tap coefficient counter 11 a tap coefficient weighting circuit 11 b tap coefficient Integration circuit 11c Threshold judgment circuit 12 Transmission line 13 Signal processor 14 Error pulse counter

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04B 1/04 H04B 7/005

Claims (7)

(57) [Claims] 1. Transmission of a transmitter based on the state of a spatial transmission path
In a wireless communication device for controlling output , according to the case of a plurality of fading states of the spatial transmission path,
Output control means for controlling the transmission output of the transmitter
And transmitting the transmission output of the transmitter through the spatial transmission path.
Level detection to detect the reception level from the receiver
An output unit, a bit error number counting unit that counts the number of bit errors output from a demodulation unit that demodulates an output of the receiver , and an equalization unit that equalizes an intersymbol interference component included in an output of the demodulation unit. And a tap coefficient counting means for counting tap coefficients of the equalization means, wherein the output control means,
Based on the received input level information of the level detection unit, the number of bit errors counted by the bit error number counting unit, and the tap coefficient counted by the tap coefficient counting unit, the state of the spatial transmission path is any one of the above cases. Is determined, and
Radio communications device shall be the control means controls the transmission output of the transmitter in accordance with the determination result. 2. The tap coefficient counting means according to claim 1, further comprising : a tap coefficient weighting means for weighting a tap coefficient which fluctuates greatly with respect to fading out of a forward tap coefficient and a backward tap coefficient output from said equalizing means. Tap count integration means for calculating an average value of the output of the tap coefficient weighting means over a certain period of time; and when the average value calculated by the tap count integration means exceeds a threshold value, tap coefficient determination information is output to the output control means. The wireless communication apparatus according to claim 1, further comprising a threshold value determining unit that performs threshold value determination. 3. The output control means decreases / increases a transmission output of the transmitter based on high / low of reception input level information of the receiver when the spatial transmission path is in a normal state,
Wherein if the fading space transmission path occurs to increase the transmission output of the transmitter based on the counting the number of bit errors counted information by the receiving input level information and the number of bit errors counting unit of the receiver, the spatial claim If deep fade occurs in the transmission path, characterized in that stopping the transmission power control of the transmitter based on the tap coefficient decision information outputted from said tap coefficient counting unit 1
Or the wireless communication device according to 2. Wherein said equalizing means is a transversal equalizer, or a linear equalizer, or according to any one of claims 1 to 3, characterized in that a decision feedback equalizer radio Communication device. 5. The apparatus according to claim 1, wherein said bit error number counting means is not provided.
Serial input directly to the equalizing means from the demodulating means, further counting signal processing means for performing error corrections on the basis of the output of the previous SL equalizing means, the number of error pulses output from the signal processing means error pulse Counting means, wherein the output control means sets the state of the spatial transmission path based on the tap coefficient counted by the tap coefficient counting means and the number of error pulses counted by the error pulse counting means in each of the above cases. 2. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus determines which one of the two types is determined, and controls the transmission output of the transmitter according to the determination result. 6. A transmission output control method for controlling a transmission output of a transmitter based on a state of a spatial transmission path, wherein the transmission output of the transmitter is controlled according to a case where the spatial transmission path is in a plurality of fading states. With output control process
Receiving the transmission output of the transmitter via the spatial transmission path.
The receiving input level information is output from the receiving
The output of the transceiver is demodulated by the demodulation means and output from the demodulation means.
The number of bit errors to be counted by the bit error number counting means,
Equalizing the intersymbol interference component contained in the output of the demodulation means
Equalizes in stages and counts tap coefficients of the equalization means
Means for counting, the output control step comprising:
The number of bit errors counted by the counting means and the tap coefficient
The space based on the tap coefficient counted by the counting means;
It is determined which of the above cases the transmission line state is, and
A transmission output control method, wherein the transmission output of the transmitter is controlled according to a fixed result . 7. Transmission of a transmitter based on a state of a spatial transmission path.
In a transmission output control method for controlling output, When the spatial transmission path is in a state of multiple fading,
An output control step of controlling the transmission output of the transmitter.
Receiving the transmission output of the transmitter via the spatial transmission path.
The receiving input level information is output from the receiving
The output of the transceiver is demodulated by the demodulation means, and is output to the output of the demodulation means.
Transbar included intersymbol interference component Monkey-type equalization means
And the tap coefficient of the equalizing means is calculated by a tap coefficient counter.
Signal processing means based on the output of the equalizing means.
Error correction, and the error output from the signal processing means.
The number of pulses is counted by error pulse counting means, and the output control is performed.
The step comprises the step of counting the taps counted by the tap coefficient counting means.
Coefficient and the error pulse counted by the error pulse counting means.
What is the state of the spatial transmission path based on the number of
Is determined, and the transmission of the transmitter is performed according to the determination result.
A transmission output control method characterized by controlling a transmission output.