JP3513066B2 - OFDM transmission signal repeater and receiver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal repeater and receiver for use in, for example, relay transmitters for medium-wave, short-wave, terrestrial / satellite / cable television and other digital transmissions. Regarding

[0002]

2. Description of the Related Art As a next-generation digital broadcasting system,
Development of terrestrial digital broadcasting using the current terrestrial TV band is in progress. The transmission method is O
The FDM (Orthogonal Frequency Division Multiplexing) system is adopted as a standard system in Japan and Europe. Further, the OFDM method is considered to be applied to not only terrestrial waves but also digital broadcasting such as medium wave, short wave, satellite / cable television.

By the way, in a broadcasting system, use of a relay device is required for the purpose of expanding a broadcasting service area and eliminating a blind area. In conventional analog television broadcasting, in order to suppress the distortion of the transmission line from the transmitter to the relay device, the transmission line characteristic is measured at the installation point of the relay device and the transmission line characteristic opposite to that is measured. It is realized by adjusting the frequency characteristic of the filter provided in the IF stage of the relay device based on the above.

On the other hand, it is impossible to apply the analog method to the digital method. In the case of the digital method, it is required to more accurately compensate for transmission path distortion such as multipath. The preset compensation used in the analog method cannot be used in the digital method. This is because it is necessary to detect and compensate for changing transmission line characteristics.

On the other hand, in the case of conventional analog television broadcasting, SFN (same frequency retransmission) is not performed. Therefore, in the relay device, it is not necessary to consider the sneak of the transmission output to the reception input, and it is sufficient to take the isolation between the reception antenna and the transmission antenna.

On the other hand, in digital television broadcasting by the OFDM system, SFN can be performed. In this case, since the reflected wave of the transmitted radio wave is mixed with the original incoming radio wave and is received, it is not enough to isolate the receiving antenna from the transmitting antenna. Therefore, it is required to accurately compensate the wraparound component including the reflected wave of the transmitted radio wave.

[0007]

As described above, O
When a relay device is used in digital broadcasting by the FDM system, it is necessary to accurately compensate for the distortion of the transmission path from the transmitter device and the wraparound component of the radio wave transmitted by the device itself. However, the compensation technology for the conventional analog system is used. However, it has been difficult to adaptively compensate for transmission line characteristics and wraparound characteristics that change depending on the season, weather and time.

In order to solve the above-mentioned problems, the present invention is an OFDM that can be easily adjusted and adaptively compensates for transmission line characteristics and wraparound characteristics that change depending on the season, weather and time.
A first object is to provide a transmission signal relay device.

Further, in the above-mentioned OFDM transmission signal relay apparatus, it is a first object of the present invention to provide an OFDM transmission signal receiving apparatus capable of receiving an OFDM signal with high accuracy by using the present invention capable of adaptively compensating for transmission path characteristics. The purpose is 2.

[0010]

To achieve the above object, an OFDM transmission signal relay apparatus according to the present invention has the following characteristic configuration.

(1) Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and O received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting an FDM transmission signal at the same frequency, an autocorrelation calculation means for sequentially delaying the reception signal obtained by the reception means by a predetermined time to obtain a correlation before and after the delay, Based on the relationship between the correlation detection signal obtained by this means and the delay time, the amplitude / phase characteristic of the received signal is obtained, and the compensation amount calculation means for obtaining the compensation amount from the inverse characteristic, and the compensation amount obtained by this means. And a compensating unit for compensating the amplitude / phase characteristic of the received signal based on the basis of the received signal to remove an unnecessary wave component due to multipath and outputting the result to the transmitting unit.

(2) Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and O received by this means
In an OFDM transmission signal relay device comprising a transmitting means for retransmitting an FDM transmission signal at the same frequency, the received signal obtained by the receiving means is input, and the amplitude / phase characteristic of the received signal is obtained based on a given compensation amount. And a compensating unit that removes unnecessary wave components due to multipath and outputs to the transmitting unit, and a reception signal of the OFDM transmission signal compensated by this unit is sequentially delayed by a predetermined time, and before and after the delay. Compensation for obtaining an amount of compensation given to the compensating means from the auto-correlation calculating means for obtaining the correlation and the amplitude / phase characteristic of the received signal from the relation between the correlation detection signal and the delay time obtained by this means. And a quantity calculation means.

(3) Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and O received by this means
In an OFDM transmission signal relay device comprising a transmitting means for retransmitting an FDM transmission signal at the same frequency, the received signal obtained by the receiving means is input, and the amplitude / phase characteristic of the received signal is obtained based on a given compensation amount. By compensating for the above, and compensating means for removing unnecessary wave components due to multipath and outputting to the transmitting means, and the reception signal obtained by the receiving means are sequentially delayed by a predetermined time to detect the correlation before and after the delay. Autocorrelation detection means, interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal obtained by this means and the delay time, and the interference wave obtained by this means Based on the delay time, the amplitude / phase characteristic of the interfering wave included in the received signal is obtained from the output of the compensating means, and the compensation amount given to the compensating means is calculated from the inverse characteristic. Characterized by comprising a Mel compensation amount calculation means.

(4) In any one of the configurations (1) to (3), the compensation amount computing means holds a correlation characteristic holding means that holds a correlation characteristic uniquely determined in advance by a frequency component of the OFDM transmission signal, Correlation signal processing means for detecting an interfering wave component having a small level contained in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic detected by the autocorrelation calculation means. It is characterized by including.

In the configurations of (5) and (3), the interference detection means is detected by the correlation characteristic holding means for holding the correlation characteristic uniquely determined in advance by the frequency component of the OFDM transmission signal and the autocorrelation calculation means. Correlation signal processing means for detecting a low-level interfering wave component contained in the input signal by removing the correlation characteristic component held by the correlation characteristic holding means from the correlation characteristic holding means.

(6) In the configuration of any one of (1) to (3), the compensation amount calculation means is a correlation characteristic holding means for holding a correlation characteristic detected from an input signal in advance in a non-wraparound situation. , Correlation signal processing means for detecting an interfering wave component having a small level included in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic detected from the input signal. It is characterized by

In the configurations of (7) and (3), the interference detection means has a correlation characteristic holding means for holding the correlation characteristic detected from the input signal in advance in a non-wraparound condition, and a correlation detected from the input signal. Correlation signal processing means for detecting an interfering wave component having a low level contained in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means from the characteristic.

(8) In any one of the configurations (1) to (3), there is further provided a signal component detecting means for detecting whether or not the received signal of the OFDM transmission signal includes a signal component. When it is detected by the means that no signal component is included, the compensation processing of the compensation means is stopped.

(9) In any one of the configurations (1) to (3), the compensation amount calculating means includes an abnormality detecting means for detecting an abnormality in the input signal, and the abnormality is detected by this means. At this time, an output control means for attenuating or blocking the relay output is provided.

(10) In any one of the configurations (1) to (3), when a retransmission signal is generated from the signal obtained by the compensation means, an out-of-band component is suppressed from the retransmission signal. It is characterized by including a band limiting filter.

(11) In any one of the configurations (1) to (3), the compensation amount calculation means has a delay time set according to an expected multipath delay time, and delays the input signal. Means and an FIR filter for compensating the amplitude / phase component of the signal delayed by this means.

Further, the OFDM transmission signal receiving apparatus according to the present invention has the following characteristic configuration.

(12) OFDM (Orthogonal Frequency Division Multiplexing)
In the OFDM transmission signal receiving apparatus, which is provided with the receiving means for receiving the transmission signal and the demodulation means for demodulating the multiplexed transmission signal by FFT processing the reception signal obtained by the receiving means, The auto-correlation calculating means for sequentially delaying the received signal by a predetermined time to obtain the correlation before and after the delay, and the amplitude / phase characteristic of the received signal is obtained from the relationship between the correlation detection signal and the delay time obtained by this means. Compensation amount calculating means for obtaining a compensation amount from the inverse characteristic, and wraparound by compensating the amplitude / phase characteristics of the received signal based on the compensation amount obtained by this means to remove unnecessary wave components due to multipath and Compensation means for outputting to the demodulation means.

(13) OFDM (Orthogonal Frequency Division Multiplexing)
In the OFDM transmission signal receiving apparatus, which is provided with the receiving means for receiving the transmission signal and the demodulation means for demodulating the multiplexed transmission signal by FFT processing the reception signal obtained by the receiving means, Input received signal,
A compensating unit that wraps around by compensating the amplitude / phase characteristic of the received signal based on a given compensation amount, removes unnecessary wave components due to multipath, and outputs the demodulating unit,
The received signal of the OFDM transmission signal compensated by this means is sequentially delayed by a predetermined time to obtain the correlation before and after the delay, and the received signal is obtained from the relationship between the correlation detection signal and the delay time obtained by this means. Compensation amount calculating means for obtaining the amplitude / phase characteristic of the signal and for obtaining the compensation amount given to the compensating means from the inverse characteristic thereof.

(14) OFDM (Orthogonal Frequency Division Multiplexing)
In the OFDM transmission signal receiving apparatus, which is provided with the receiving means for receiving the transmission signal and the demodulation means for demodulating the multiplexed transmission signal by FFT processing the reception signal obtained by the receiving means, Input received signal,
A compensating unit that wraps around by compensating the amplitude / phase characteristic of the received signal based on a given compensation amount, removes unnecessary wave components due to multipath, and outputs the demodulating unit,
An autocorrelation detecting unit that sequentially delays the reception signal obtained by the receiving unit by a predetermined time to detect the correlation before and after the delay,
Interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal obtained by this means and the delay time, and the interference detection means based on the delay time of the interference wave obtained by this means Compensation amount calculating means for determining the amplitude / phase characteristic of the interfering wave contained in the received signal from the output of the compensating means and the compensation amount given to the compensating means from its inverse characteristic are provided.

(15) In any one of the constitutions (12) to (14), the compensation amount calculating means is preliminarily provided with the OFD.
Correlation characteristic holding means for holding the correlation characteristic uniquely determined by the frequency component of the M transmission signal, and excluding the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristics detected by the autocorrelation calculation means. And a correlation signal processing means for detecting an interfering wave component having a low level included in the input signal.

In the configurations (16) and (14), the interference detection means is detected by the correlation characteristic holding means for holding the correlation characteristic uniquely determined in advance by the frequency component of the OFDM transmission signal and the autocorrelation calculation means. Correlation signal processing means for detecting an interfering wave component having a low level contained in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic is provided.

(17) In any one of the configurations (12) to (14), the compensation amount computing means is a correlation characteristic holding means for holding a correlation characteristic detected from an input signal in advance in a non-wraparound situation. , Correlation signal processing means for detecting an interfering wave component having a small level included in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic detected from the input signal. It is characterized by

(18) In the structure of (14), the interference detecting means includes a correlation characteristic holding means for holding a correlation characteristic detected from an input signal in a non-wraparound condition in advance.
Correlation signal processing means for detecting an interfering wave component having a small level included in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic detected from the input signal. Is characterized by.

(19) The configuration according to any one of (12) to (14) further includes signal component detecting means for detecting whether or not the received signal of the OFDM transmission signal contains a signal component. When it is detected by the means that no signal component is included, the compensation processing of the compensation means is stopped.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIG. 1 is used for OFDM terrestrial digital television broadcasting.
1 illustrates a configuration of an OFDM transmission signal relay device according to the present invention. In FIG. 1, an RF input signal to be relayed is frequency-converted by a down converter 1 from a radio frequency (RF) band to an intermediate frequency (IF) band and becomes an IF signal. This IF signal is converted into a digital signal by an AD (analog / digital) converter 2, then converted into a complex baseband OFDM signal by an orthogonal demodulator 3, and input to a compensation amount detector 4 and a compensator 5. .

The compensation amount detector 4 includes a delay device 41, a delay controller 42, a correlation detector 43, an integrator 44, and a compensation amount calculator 4.
It is composed of 5.

The IF signal input to the compensation amount detector 4 is
It is supplied to the delay device 41. This delay device 41 is, for example, R
An AM memory or a FIFO memory is used to delay the digital baseband OFDM signal according to the delay time control signal from the delay controller 42, and the delayed output is supplied to the correlation detector 43. This correlation detector 43 is
The input signal and the output signal of the delay unit 41 are input, and the complex correlation between the two is detected using, for example, a complex multiplier, and the detection result is supplied to the integrator 44. This integrator 44
Is to remove the influence of noise or the like by integrating the complex correlation signal from the correlation detector 43 by using a section integrator that divides the cumulative value by the cumulative time. Is supplied to the container 45.

The compensation amount calculator 45 is a delay controller 42.
The delay time control signal output from the integrator 44 and the correlation detection signal output from the integrator 44 are input to obtain the correlation characteristic, and the compensation signal indicating the amplitude / phase compensation component is calculated from the inverse characteristic. The compensation signal is obtained as a correlated IQ signal, for example. The above delay time control signal and compensation signal are sent to the compensator 5.

This compensator 5 is, for example, FIR (cyclic type).
Composed of filters. In this case, the delay time component is FI
Corresponding to the tap number of the R filter, the amplitude / phase compensation component corresponds to the tap coefficient of the FIR filter. A specific configuration is shown in FIG. In this configuration, the input is distributed to the (n + 1) th line, and the signals of the 1st to nth lines except the main line are delayed by a predetermined time by the n delay devices 511 to 51n (the 1st line).
Line may have a delay amount of 0), and each delay signal is F
After filtering with IR filters 521 to 52n,
The adder 53 adds and synthesizes the signals of the main line and the first to nth lines.

That is, in the compensator 5 having the above structure,
A time domain having a relatively large amplitude / phase compensation component is extracted.
The time domain having a large amplitude / phase compensation component is compensated by the FIR filter. In this case, regarding the wraparound signal having a long delay, the circuit scale of the FIR filter can be reduced by combining the delay device and the FIR filter. In the case of a time domain in which the amplitude / phase compensation component is relatively small, it can be realized by only a delay device.

The quadrature modulator 6 converts the compensated digital baseband OFDM signal into a digital IF signal. The digital IF signal output from the quadrature modulator 6 is converted into an analog signal by the DA (digital / analog) converter 7, becomes an RF signal by the up converter 8, and becomes an output of the relay device.

The operation of the compensation amount detector 4 of FIG. 1 in a situation where there is a wraparound interference will be described.

Now, let s (t) be the desired wave and u be the output of the repeater.
(t), where f is the frequency characteristic of the sneak path, the input of the compensation amount detector 4 is expressed as s (t) + f · u (t). Here, if the complex conjugates of s (t) and u (t) are expressed as s ^* (t) and u ^* (t), the autocorrelation for detecting the compensation amount is (s (t) + fu (u ^{t)) × (s * (} t) + f · u * (t)) = s (t) × s * (t) + f 2 · u (t) × u * (t) + f × (s (t) × u ^* (t) + s ^* (t) × u (t)). Therefore, if the scale of the autocorrelation result and the known autocorrelation waveform are matched and the subtraction is performed to eliminate the desired wave component of the first term in the above equation, the transmission path distortion and Frequency characteristics due to wraparound can be obtained. By compensating this frequency characteristic with the compensator 5, the desired wave component can be accurately extracted.

Therefore, the OFDM transmission signal relay apparatus having the above configuration can accurately detect the transmission path distortion from the transmission apparatus and the wraparound component of the transmission radio wave of the own apparatus.
As a result, it is possible to adaptively compensate for the transmission line characteristic and the wraparound characteristic that change depending on the season, weather, and time with a simple adjustment.

Although the compensator 5 shown in FIG. 2 has a feedforward loop configuration, it goes without saying that it may have a feedback loop configuration as shown in FIG. 3, the same parts as those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted here.

(Second Embodiment) FIG. 4 shows the O according to the present invention.
6 shows a configuration of a second embodiment of an FDM transmission signal relay device. However, in FIG. 4, the same parts as those in FIG. 1 are denoted by the same reference numerals, and different parts will be described here.

The relay device shown in FIG. 4 differs from the device shown in FIG. 1 in that the input of the compensation amount detector 4 is taken from the output of the compensator 5. That is, the relay device of FIG. 1 is performing the feedforward process, while the relay device of FIG. 4 is performing the feedback process. According to this difference in configuration, the configuration of FIG. 1 is advantageous in terms of response speed, whereas the configuration of FIG. 4 is advantageous in terms of compensation accuracy.

The operation of the compensation amount detector 4 of FIG. 4 in a situation where there is a wraparound interference will be described.

Now, let s (t) be the desired wave and u be the output of the repeater.
(t), if the frequency characteristic of the sneak path is f and the frequency characteristic of the compensator 5 is f ', the input of the compensation amount detector 4 is s.
It is expressed as (t) + f · u (t) −f ′ · u (t). here,
When the complex conjugates of s (t) and u (t) are expressed as s ^* (t) and u ^* (t), the autocorrelation for detecting the compensation amount is (s (t) + f · u (t) − f ' ^* u (t)) x (s ^* (t) + f ^* u ^* (t) -f' ^* u ^* (t)) = s (t) * s ^* (t) + (f-f ') ² · u (t) × u ^* (t) + (f−f ′) × (s (t) × u ^* (t) + s ^* (t) × u (t)). Therefore, if the scale of the autocorrelation result and the known autocorrelation waveform are matched and the subtraction is performed to eliminate the desired wave component of the first term in the above equation, the transmission path distortion and An error between the frequency characteristic due to the wraparound and the frequency characteristic of the compensator 5 can be obtained. By compensating the frequency characteristic obtained by accumulating the error components of the frequency characteristic with the compensator 5, the desired wave component can be accurately extracted.

In each of the above embodiments, the digital signal processing is performed in the entire relay device, but the compensator may be realized by analog signal processing, and only the inside of the compensation amount detector 4 may be digital signal processed. Of course.

(Third Embodiment) A more specific embodiment of the OFDM transmission signal relay device will be described below.

FIG. 5 shows the basic configuration of this embodiment. In FIG. 5, R from the receiving antenna (not shown)
The F-band OFDM signal is frequency-converted from the radio frequency (RF) band to the intermediate frequency (IF) band by the down converter 101 and becomes an IF signal. This IF signal is adjusted in gain to a constant level by an AGC (auto gain control) attenuator 102, and then subjected to interference cancellation processing by a compensator 103 and output. Note that the compensator 103 has a plurality of processing circuits in order to handle a plurality of interfering waves. However, in order to simplify the description, the number of disturbing waves that can be dealt with is “3”.

The output of the compensator 103 is the level detector 1
After the level detection for AGC is performed by 04, the presence or absence of a signal is confirmed by the squelch 105, and the transmission band is adjusted by the bandpass filter (BPF) 108 via the attenuator 106 for output level adjustment and the switch 107 for emergency cutoff. Outer unwanted waves are removed, the up-converter 109 performs frequency conversion into the RF band, and becomes the output of the relay device. The signal detection result of the squelch 105 is output to the compensation amount detector 119 described later.

Here, the band pass filter 108
In addition to the original purpose of suppressing out-of-band radiation, it also serves to delay the delay time of the sneaking signal to facilitate the detection of an interfering wave.

The IF output of the AGC attenuator 102 is frequency-converted into a base band by the down converter 110, converted into a digital signal by the AD converter 111, and converted into a base band OFDM signal in a complex format by the quadrature demodulator 112. . The complex output of the quadrature demodulator 112 is supplied to the interference detector 114 after removing unnecessary noise components by a low pass filter (LPF) 113.

The interference detector 114 detects the delay time of an interference wave due to multipath and transmission wave wraparound by performing correlation detection over the entire band of the input OFDM signal. The interference detected here. The wave detection information (delay time) is output to the compensation amount detector 119.

The output of the squelch 105 is frequency-converted into a base band by a down converter 115,
The D converter 116 converts the signal into a digital signal, and the quadrature demodulator 117 converts the signal into a complex baseband OFDM signal. The complex output of the quadrature demodulator 117 is supplied to the compensation amount detector 119 after removing unnecessary noise components by the low pass filter (LPF) 118, and is also supplied to the compensator 103.

Based on the interference wave detection information from the interference wave detector 114, the compensation amount detector 119 performs correlation detection on the complex baseband OFDM signal in the vicinity of the detection timing and performs integration processing to obtain the amplitude / phase characteristic. Then, the compensation amount of the position, amplitude and phase (angle) of the interfering wave with respect to the received signal is calculated from the inverse characteristic. The compensation amount calculation result is supplied to the compensator 103.

Here, when the compensation amount detector 119 receives the information indicating that there is no signal from the squelch 105,
To avoid careless processing, the processing operation is stopped. Further, when the compensation amount calculation result shows an abnormal value that exceeds the specified value, an abnormality detection signal is sent to the output control device 120. At this time, the output control device 120 keeps the attenuator 1 until the abnormality detection signal is no longer output from the compensation amount detector 119.
When the gain of 06 is reduced and the abnormality is still detected, the switch 107 is turned off to interrupt the transmission output of the relay device.

The compensator 103 is specifically constructed as shown in FIG. In FIG. 5, the complex baseband OFDM signal given from the LPF 118 is divided into three systems, and the delay units 1211 to 1213 and the complex F are respectively distributed.
Quadrature modulator 1 via IR filters 1221 to 1223
2311 to 1233 combine the complex outputs. Here, the delay amount of the delay devices 1211 to 1213, the complex FIR filter 1
The coefficients 221 to 1223 are set according to the compensation signal from the compensation amount detector 119.

The outputs of the quadrature modulators 1231 to 1233 are input to the DA converters 1251 to 1253 via the FIFO memories 1241 to 1243, converted into analog signals here, and then added by the adder 126, and the up converter 127. Then, the frequency is converted to the IF band by the adder 128 provided in the main line system and added with the output of the AGC attenuator 102.

Incidentally, the FIFO memories 1241 to 124
3 read clock and DA converters 1251-125
The sampling clock of No. 3 is generated by the clock generation circuit 129, and this clock generation circuit 129 finely adjusts the clock frequency according to the compensation signal from the compensation amount detector 119. As a result, the delay amount that cannot be completely absorbed by the delay devices 1211 to 1213 can be finely adjusted.

FIG. 6 shows a specific structure of the interference detector 114. In FIG. 6, baseband I-axis data and Q-axis data are supplied to the complex multiplier 130, and the delay unit 1
In step 31, the complex conjugate of the I-axis data and the Q-axis data, which are appropriately delayed, and the complex multiplication are performed. The outputs of the complex multiplications are respectively integrated by the integrator 133 into a real part and an imaginary part, and integrated, and are supplied to the interference detection section 134 as an autocorrelation detection result. The delay amount of the delay device 131 is swept over the entire interference detection range by a delay time control signal from the delay controller 132.

The interference detecting section 134 inputs the signal from the integrator 133 to the coordinate converter 1341 and detects the angle and the amplitude. The angle data and amplitude data detected by the coordinate converter 1341 are sent to the correlation characteristic table 1342. The correlation characteristic table 1342 stores the amplitude data and the angle data from the coordinate converter 1341 in association with the delay time control signal from the delay controller 132 using the RAM. The delay data, the amplitude data, and the angle data stored in the correlation characteristic table 1342 are appropriately supplied to the correlation signal processor 1343. The correlation signal processor 1343 obtains delay time data corresponding to the input data based on the autocorrelation correction curve generated by the autocorrelation correction curve generator 1344. The delay time data is compensated as interference wave detection information. It is output to the quantity detector 119.

FIG. 7 shows a specific configuration of the compensation amount detector 119. In FIG. 7, the baseband I-axis data and Q-axis data are supplied to the complex multiplier 135, and are complex-multiplied by the complex conjugate of the I-axis data and the Q-axis data delayed appropriately by the delay unit 136. The outputs of the complex multiplications are respectively integrated by the integrator 138 into a real part and an imaginary part, and are supplied to the compensation amount calculation part 139 as an autocorrelation result. The delay amount of the delay unit 136 is swept by the delay controller 137, and the delay controller 137 controls the delay amount over the vicinity based on the delay time data given from the interference detector 114.

The compensation amount calculation section 139 has an integrator 138.
The signal from is input to the coordinate converter 1391, and the angle and amplitude are detected. The angle data and amplitude data detected by the coordinate converter 1391 are sent to the correlation characteristic table 1392. The correlation characteristic table 1392 stores the amplitude data and the angle data from the coordinate converter 1391 in association with the delay time control signal from the delay controller 137 using the RAM. The delay data, the amplitude data, and the angle data stored in the correlation characteristic table 1392 are appropriately
It is supplied to the correlation signal processor 1393. The correlation signal processor 1393 obtains each data of amplitude, angle, and delay time corresponding to the input data and outputs the data to the compensator 103, and when these show an abnormal value, generates an output cutoff control signal, Output to the output control device 120.

The interference detecting section 134 can also be constructed as shown in FIG. The interference detection unit 134 is a RAM that constitutes the coordinate converter 140 and the correlation characteristic table 1.
141, a correlation signal processing unit 142, a RAM or ROM 143 forming the correlation characteristic table 2, an interference detection signal generator 144, and a correlation signal processing unit 145, and receives I and Q signals.

That is, the I and Q signals input to the interference detection unit 134 are supplied to the coordinate converter 140. The coordinate converter 140 converts an IQ signal represented by rectangular coordinates into an amplitude / angle signal (A, θ) represented by polar coordinates, and the output of the coordinate converter 140 is supplied to the RAM 141. The output of the coordinate converter 140 is written in the RAM 141 with the delay time as an address, and the correlation characteristic detected from the input signal is described by this. RA
In the M or ROM 143, the correlation characteristic uniquely determined by the frequency component of the transmission signal is described with the delay time as an address.

The correlation signal processing section 142 outputs the output of the correlation characteristic table 1 (RAM 141) and the correlation characteristic table 2 (R
The output of the AM or ROM 143) is input, the maximum value of the correlation amplitude of the output of the correlation characteristic table 1 is detected, and the amplitude, angle, and delay time at this time are obtained to obtain the interference detection signal generator 1
Output to 44. Also, by removing the output of the correlation characteristic table 2 from the output of the correlation characteristic table 1,
Only the correlation component generated by the wraparound is extracted and output to the next correlation signal processing unit 145.

The correlation signal processing section 145 inputs the output of the correlation signal processing section 142 and the output of the correlation characteristic table 2, detects the maximum value of the correlation amplitude of the output of the correlation signal processing section 142, and detects the amplitude at this time. , Angle, and delay time are obtained and output to the interference detection signal generator 144. Correlation signal processing unit 142
By removing the output of the correlation characteristic table 2 from the output of 1), only the correlation component generated by the multipath having a small amplitude and the wraparound is extracted and output to the next correlation signal processing unit (not shown).

The interference detection signal generator 144 outputs the delay time out of the amplitude, angle and delay time output from the correlation signal processing units 142 and 145 to the compensation amount detector 119.

By repeating the above correlation signal processing procedure, the autocorrelation components included in the output of the correlation characteristic table 1 are removed in descending order of amplitude, so that smaller components are easily detected and the detection accuracy is improved. improves.

In FIG. 8, the correlation signal processing unit has a two-stage structure, but by increasing the number of stages, more accurate interference detection can be performed.

In the above example, RAM or ROM
Although the correlation characteristic uniquely determined by the frequency component of the transmission signal is described in 143, the same effect can be obtained by previously describing the correlation characteristic detected from the input signal in the situation where there is no wraparound. .

The compensation amount calculation unit 139 can also be configured as shown in FIG. This compensation amount calculation unit 139
Is composed of a coordinate converter 146, a RAM 147 configuring the correlation characteristic table 1, a correlation signal processing unit 148, a RAM or ROM 149 configuring the correlation characteristic table 2, a compensation signal generator 150, and a correlation signal processing unit 151. Q
Input signal.

That is, the I and Q signals input to the compensation amount calculator 139 are supplied to the coordinate converter 146. The coordinate converter 146 converts an IQ signal represented by rectangular coordinates into an amplitude / angle signal (A, θ) represented by polar coordinates, and the output of the coordinate converter 146 is supplied to the RAM 147. The output of the coordinate converter 146 is written in the RAM 147 using the delay time as an address, and the correlation characteristic detected from the input signal is described by this. RA
In the M or ROM 149, the correlation characteristic uniquely determined by the frequency component of the transmission signal is described with the delay time as an address.

The correlation signal processing section 148 outputs the output of the correlation characteristic table 1 (RAM 147) and the correlation characteristic table 2 (R
The output of the AM or ROM 149) is input, the maximum value of the correlation amplitude of the output of the correlation characteristic table 1 is detected, and the amplitude, angle, and delay time at this time are calculated to obtain the compensation signal generator 150.
Output to. Further, by removing the output of the correlation characteristic table 2 from the output of the correlation characteristic table 1, only the correlation component generated by multipath and wraparound is extracted and output to the next correlation signal processing unit 151.

The correlation signal processing unit 151 inputs the output of the correlation signal processing unit 148 and the output of the correlation characteristic table 2 and detects the maximum value of the correlation amplitude of the output of the correlation signal processing unit 148. , Angle and delay time are calculated and output to the compensation signal generator 150. In addition, the correlation signal processing unit 14
By removing the output of the correlation characteristic table 2 from the output of 8,
Only the multipath having a small amplitude and the correlation component generated by the wraparound are extracted and output to the next correlation signal processing unit (not shown).

The compensation signal generator 150 obtains the wraparound of the transmission wave and the amplitude / phase characteristic of the multipath transmission line from the amplitude, angle, and delay time output from the correlation signal processing units 148 and 151, and the compensation representing the inverse characteristic is obtained. Generate signal and compensator 1
03, and also to the output control device 120.

By repeating the above correlation signal processing procedure, the autocorrelation components included in the output of the correlation characteristic table 1 are removed in descending order of amplitude, so that smaller components are easily detected and the detection accuracy is improved. improves. Incidentally, FIG.
In the above, the correlation signal processing unit has a two-stage configuration, but it is possible to detect the compensation amount with higher accuracy by further increasing the number of stages.

According to the above configuration, the interference detector 1 on the input side
Since the interference wave is detected by 14 and the delay time is obtained, the compensation amount detector 119 on the output side calculates the compensation amount in the vicinity based on the interference detection result, and the feedback is applied to the compensator. More accurate compensation is possible.
In particular, in the case of interference detection, the presence or absence of interference waves due to wraparound and multipath and their interference wave levels are constantly monitored by autocorrelation detection, so that when an interference wave occurs, it can be detected and compensated immediately. .

In the above example, RAM or ROM1
Although the correlation characteristic uniquely determined by the frequency component of the transmission signal is described in 49, the same effect can be obtained by previously describing the correlation characteristic detected from the input signal in the situation without wraparound. .

The circuit configuration of the compensation amount calculator 139 shown in FIG. 9 can also be applied to the compensation amount calculator 45 shown in FIGS.

(Other Embodiments) The above first and second embodiments
In the second embodiment, as in the third embodiment, it is more effective to provide a band limiting filter that suppresses a frequency component outside the transmission band from the relay output at the output stage of the relay device. According to this configuration, since the out-of-band radiation is suppressed, it is possible not only to eliminate the influence on the adjacent transmission band, but also to increase the delay time of the sneak signal by the filter, so that the interference wave in the compensation amount detector 4 The detection can be facilitated.

In addition, in the compensation processing section (combination of compensator and compensation amount detector) in each of the above-mentioned embodiments, when the number of interfering wave components due to multipath or wraparound increases, it becomes difficult to remove all these components. Become. Further, when the interference wave component due to the wraparound is large, the interference wave component included in the amplitude / phase characteristics of the received signal cannot be completely compensated, and the interference wave component remains. Therefore, the compensation processing units are connected in cascade. According to this configuration, the interference wave components are repeatedly removed by the plurality of stages of compensation processing units, so that the interference wave components can be removed more reliably. Further, since the delay amount of the wraparound can be increased, the detection accuracy of the interfering wave can be further improved.

Further, the compensation processing section in each of the above-mentioned embodiments effectively acts not only on the wraparound of the transmitted wave but also on the multipath. Therefore, when applied to the OFDM transmission signal receiving apparatus, it is possible to reduce the influence of multipath regardless of the guard period added to the OFDM signal.

FIG. 10, FIG. 11 and FIG. 12 respectively show FIG.
FIG. 6 shows a configuration of an OFDM transmission signal receiving apparatus using the compensation processing unit of the OFDM transmission signal relay apparatus shown in FIGS. 4 and 5. In FIGS. 10, 11, and 12, the same parts as those in FIGS. 1, 4, and 5 are designated by the same reference numerals,
The description is omitted.

The OFDM transmission signal receiving apparatus shown in FIGS. 10 and 11 is adapted to supply the output of the compensator 5 shown in FIGS. 1 and 4 to the FFT circuit 9 of the demodulation system as an OFDM reception signal. Is. In addition, OF shown in FIG.
The DM transmission signal receiving device is the squelch circuit 1 shown in FIG.
The output of 05 is the OFDM received signal
It is adapted to be supplied to the circuit 160.

Here, when data is multiplexed and transmitted by the OFDM signal, a technique is adopted in which a guard period is added to the effective symbol period to reduce the multipath generated within the guard period. According to the configuration of
Since the interfering wave component due to the multipath can be removed regardless of the guard period, the effect of effectively acting on the multipath delayed for the guard period or more can be obtained.

[0087]

As described above, according to the present invention, the OFDM transmission signal relay apparatus and the OFDM transmission signal reception apparatus which can be easily adjusted and adaptively compensate for the transmission path characteristics that change depending on the season, weather and time. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an OFDM terrestrial digital television broadcast relay device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a compensator used in the same embodiment.

FIG. 3 is a block diagram showing another configuration of the compensator used in the same embodiment.

FIG. 4 is a block diagram showing the configuration of an OFDM terrestrial digital television broadcast relay device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an OFDM terrestrial digital television broadcast relay device according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing a specific configuration of an interference detector used in the same embodiment.

FIG. 7 is a block diagram showing a specific configuration of a compensation amount detector used in the same embodiment.

FIG. 8 is a block diagram showing a specific configuration of an interference detection unit of the interference detector used in the embodiment.

FIG. 9 is a block diagram showing a specific configuration of a compensation amount calculation unit of the compensation amount detector used in the embodiment.

FIG. 10 is a block diagram showing the configuration of an embodiment of an OFDM transmission signal receiving apparatus according to the present invention.

FIG. 11 is a block diagram showing the configuration of another embodiment of the OFDM transmission signal receiving apparatus according to the present invention.

FIG. 12 is a block diagram showing the configuration of another embodiment of an OFDM transmission signal receiving apparatus according to the present invention.

[Explanation of symbols]

1 ... Down converter 2 ... AD converter 3 ... Quadrature demodulator 4 Compensation amount detector 41 ... Delay device 42 ... Delay controller 43 ... Correlation detector 44 ... Integrator 45 ... Compensation amount calculator 5 ... Compensator 511-51n ... delay device 521 to 52n ... FIR filter 53 ... Adder 6 ... Quadrature modulator 7 ... DA converter 8 ... Upconverter 101 ... Down converter 102 ... AGC attenuator 103 ... Compensator 104 ... Level detector 105 ... Squelch 106 ... Attenuator for adjusting output level 107 ... Switch for emergency shutoff 108 ... Bandpass filter (BPF) 109 ... Upconverter 110 ... Down converter 111 ... AD converter 112 ... Quadrature demodulator 113 ... Low-pass filter (LPF) 114 ... Interference detector 115 ... Down converter 116 ... AD converter 117 ... Quadrature demodulator 118 ... Low-pass filter (LPF) 119 ... Compensation amount detector 120 ... Output control device 1211-1213 ... Delay device 1221 to 1223 ... Complex FIR filter 1231 to 1233 ... Quadrature modulator 1241 to 1243 ... FIFO memory 1251-1253 ... DA converter 126 ... Adder 127 ... Upconverter 128 ... Adder 129 clock generation circuit 130 ... Complex multiplier 131 ... Delay device 132 ... Delay controller 133 ... Integrator 134 ... Interference detection unit 1341 ... Coordinate converter 1342 ... Correlation characteristic table 1343 ... Correlation signal processor 1344 ... Autocorrelation correction curve generator 135 ... Complex multiplier 136 ... Delay device 137 ... Delay controller 138 ... Integrator 139 ... Compensation amount calculation unit 1391 ... Coordinate converter 1392 ... Correlation characteristic table 1343 ... Correlation signal processor 140 ... Coordinate converter 141 ... RAM (correlation characteristic table 1) 142 ... Correlation signal processing unit 143 ... RAM or ROM (correlation characteristic table 2) 144. Interference detection signal generator 145 ... Correlation signal processing unit 146 ... Coordinate converter 147 ... RAM (correlation characteristic table 1) 148 ... Correlation signal processing unit 149 ... RAM or ROM (correlation characteristic table 2) 150 ... Compensation signal generator 151 ... Correlation signal processing unit 9, 160 ... FFT circuit

Continuation of front page (56) Reference JP-A-11-298434 (JP, A) Hiroyuki Hamazumi, Koichiro Imamura, Naohiko Iizo, Kazuhiko Shibuya, Broadcast-wave relay detour canceller for digital terrestrial broadcasting SFN. , Technical Report of The Institute of Image Media, Japan, The Institute of Image Media, March 16, 1999, Vol. 23 No. 24, pp. 49-56 (58) Fields investigated (Int.Cl. ⁷ , DB name) H04J 11/00

Claims (43)

(57) [Claims] 1. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFDM received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting a transmission signal at the same frequency, an autocorrelation calculation means for sequentially delaying the reception signal obtained by the reception means by a predetermined time and obtaining a correlation before and after the delay, Compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by the means, and the compensation amount from the inverse characteristics, and a compensation amount calculation means for obtaining the compensation amount. Compensating the amplitude and phase characteristics of the received signal to remove the unwanted wave component due to multipath and output to the transmitting means, the compensation amount computing means preliminarily performing the OFDM transmission. Correlation characteristic holding means for holding the correlation characteristic uniquely determined by the frequency component of the signal, and the correlation characteristic holding means for holding the correlation characteristic from the correlation characteristics detected by the autocorrelation calculation means. An OFDM transmission signal relay apparatus, comprising: a correlation signal processing unit that detects an interfering wave component having a low level included in an input signal by removing a component having the correlated characteristic. 2. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFDM received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting a transmission signal at the same frequency, an autocorrelation calculation means for sequentially delaying the reception signal obtained by the reception means by a predetermined time and obtaining a correlation before and after the delay, Compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by the means, and the compensation amount from the inverse characteristics, and a compensation amount calculation means for obtaining the compensation amount. Compensating means for compensating the amplitude and phase characteristics of the received signal to remove the unnecessary wave component due to multipath and output to the transmitting means. Correlation characteristic holding means for holding the correlation characteristic detected from the input signal in the situation, and correlation held by the correlation characteristic holding means from the correlation characteristic detected from the input signal An OFDM transmission signal relay apparatus, comprising: a correlation signal processing unit that detects a low-level interference wave component included in an input signal by removing a characteristic component. 3. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFDM received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting a transmission signal at the same frequency, an autocorrelation calculation means for sequentially delaying the reception signal obtained by the reception means by a predetermined time and obtaining a correlation before and after the delay, Compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by the means, and the compensation amount from the inverse characteristics, and a compensation amount calculation means for obtaining the compensation amount. Compensating means for wrapping around by compensating the amplitude and phase characteristics of the received signal, removing unnecessary wave components due to multipath and outputting to the transmitting means, and a signal component included in the received signal of the OFDM transmission signal. A signal component detecting means for detecting whether or not there is a signal component, and when it is detected that the signal component is not included, the compensating process of the compensating means is stopped. OFDM transmission signal repeater, characterized in that had Unishi. 4. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFDM received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting a transmission signal at the same frequency, an autocorrelation calculation means for sequentially delaying the reception signal obtained by the reception means by a predetermined time and obtaining a correlation before and after the delay, Compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by the means, and the compensation amount from the inverse characteristics, and a compensation amount calculation means for obtaining the compensation amount. Compensating the amplitude and phase characteristics of the received signal to circumvent and remove unnecessary wave components due to multipath to output to the transmitting means. An OFDM transmission characterized by further comprising: an abnormality detecting means for detecting an error, and further, an output control means for attenuating or blocking the relay output when an abnormality is detected by this means. Signal relay device. 5. Reception means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFDM received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting a transmission signal at the same frequency, an autocorrelation calculation means for sequentially delaying the reception signal obtained by the reception means by a predetermined time and obtaining a correlation before and after the delay, Compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by the means, and the compensation amount from the inverse characteristics, and a compensation amount calculation means for obtaining the compensation amount. Compensating means for compensating the amplitude and phase characteristics of the received signal to remove the unwanted wave component due to multipath and output to the transmitting means, and a retransmission signal is generated from the signal obtained by the compensating means. At this time, an OFDM transmission signal relay apparatus comprising: a band limiting filter that suppresses an out-of-band component from the retransmission signal. 6. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFDM received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting a transmission signal at the same frequency, the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal are calculated based on a given compensation amount. A compensating means that wraps around by compensating, removes unnecessary wave components due to multipath and outputs to the transmitting means, and a reception signal of an OFDM transmission signal compensated by this means are sequentially delayed by a predetermined time to correlate before and after the delay. An autocorrelation calculating means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and a compensation amount for obtaining the compensation amount given to the compensating means from the inverse characteristic Computation means, wherein the compensation amount computation means holds in advance a correlation characteristic holding means for holding a correlation characteristic uniquely determined by a frequency component of the OFDM transmission signal, Correlation signal processing means for detecting an interfering wave component having a small level contained in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic detected by the autocorrelation calculation means. An OFDM transmission signal relay device comprising: 7. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFDM received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting a transmission signal at the same frequency, the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal are calculated based on a given compensation amount. A compensating means that wraps around by compensating, removes unnecessary wave components due to multipath and outputs to the transmitting means, and a reception signal of an OFDM transmission signal compensated by this means are sequentially delayed by a predetermined time to correlate before and after the delay. An autocorrelation calculating means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and a compensation amount for obtaining the compensation amount given to the compensating means from the inverse characteristic Compensation amount computing means comprises a correlation characteristic holding means for holding a correlation characteristic previously detected from an input signal in a sneak-free state, and Correlation signal processing means for detecting an interfering wave component having a small level contained in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic detected from the force signal. An OFDM transmission signal relay device characterized by: 8. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFDM received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting a transmission signal at the same frequency, the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal are calculated based on a given compensation amount. A compensating means that wraps around by compensating, removes unnecessary wave components due to multipath and outputs to the transmitting means, and a reception signal of an OFDM transmission signal compensated by this means are sequentially delayed by a predetermined time to correlate before and after the delay. An autocorrelation calculating means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and a compensation amount for obtaining the compensation amount given to the compensating means from the inverse characteristic And a signal component detection unit for detecting whether or not the received signal of the OFDM transmission signal contains a signal component. When it does not contain is detected, OFDM transmission signal repeater being characterized in that so as to stop the compensation process of the compensating means. 9. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal, and OFDM received by this means
In an OFDM transmission signal relay device comprising a transmission means for retransmitting a transmission signal at the same frequency, the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal are calculated based on a given compensation amount. A compensating means that wraps around by compensating, removes unnecessary wave components due to multipath and outputs to the transmitting means, and a reception signal of an OFDM transmission signal compensated by this means are sequentially delayed by a predetermined time to correlate before and after the delay. An autocorrelation calculating means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and a compensation amount for obtaining the compensation amount given to the compensating means from the inverse characteristic The compensation amount calculation means comprises an abnormality detection means for detecting an abnormality in the input signal, and when an abnormality is detected by this means, OFDM transmission signal repeater, characterized in that it comprises an output control means for attenuating or blocking the output. 10. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFD received by this means.
An OFDM transmission signal relay apparatus comprising: a transmission means for retransmitting an M transmission signal at the same frequency, wherein the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal based on a compensation amount given. And a compensating means for eliminating unnecessary wave components due to multipath and outputting to the transmitting means, and a reception signal of the OFDM transmission signal compensated by this means is sequentially delayed by a predetermined time, and before and after the delay. Compensation for obtaining the correlation and the amplitude and phase characteristics of the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and the compensation amount given to the compensating means from the inverse characteristic And a band limiting filter for suppressing an out-of-band component from the retransmitted signal when the retransmitted signal is generated from the signal obtained by the compensating unit. An OFDM transmission signal relay device, comprising: 11. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFD received by this means.
An OFDM transmission signal relay apparatus comprising: a transmission means for retransmitting an M transmission signal at the same frequency, wherein the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal based on a compensation amount given. And a compensating unit that removes unnecessary wave components due to multipath and outputs to the transmitting unit, and a reception signal obtained by the receiving unit is sequentially delayed by a predetermined time to detect a correlation before and after the delay. Autocorrelation detection means, interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and the interference wave obtained by this means Based on the delay time, the amplitude and phase characteristics of the interfering wave included in the received signal are obtained from the output of the compensation means, and the compensation amount given to the compensation means is obtained from the inverse characteristics. Compensation amount calculating means, and the compensation amount calculating means is detected by the autocorrelation calculating means and a correlation characteristic holding means for holding a correlation characteristic uniquely determined in advance by the frequency component of the OFDM transmission signal. OFDM transmission characterized by including correlation signal processing means for detecting a low-level interfering wave component included in an input signal by removing a component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic Signal relay device. 12. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFD received by this means.
An OFDM transmission signal relay apparatus comprising: a transmission means for retransmitting an M transmission signal at the same frequency, wherein the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal based on a compensation amount given. And a compensating unit that removes unnecessary wave components due to multipath and outputs to the transmitting unit, and a reception signal obtained by the receiving unit is sequentially delayed by a predetermined time to detect a correlation before and after the delay. Autocorrelation detection means, interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and the interference wave obtained by this means Based on the delay time, the amplitude and phase characteristics of the interfering wave included in the received signal are obtained from the output of the compensation means, and the compensation amount given to the compensation means is obtained from the inverse characteristics. And a correlation amount holding means for holding a correlation characteristic uniquely determined by a frequency component of the OFDM transmission signal in advance, and a correlation detected by the autocorrelation calculating means. An OFDM transmission signal comprising: a correlation signal processing unit for detecting a low-level interfering wave component included in an input signal by removing a component of the correlation characteristic held by the correlation characteristic holding unit from the characteristic. Relay device. 13. Reception means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFD received by this means
An OFDM transmission signal relay apparatus comprising: a transmission means for retransmitting an M transmission signal at the same frequency, wherein the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal based on a compensation amount given. And a compensating unit that removes unnecessary wave components due to multipath and outputs to the transmitting unit, and a reception signal obtained by the receiving unit is sequentially delayed by a predetermined time to detect a correlation before and after the delay. Autocorrelation detection means, interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and the interference wave obtained by this means Based on the delay time, the amplitude and phase characteristics of the interfering wave included in the received signal are obtained from the output of the compensation means, and the compensation amount given to the compensation means is obtained from the inverse characteristics. And a correlation characteristic detecting means for holding a correlation characteristic previously detected from an input signal in a non-wraparound situation, and a correlation characteristic detected from the input signal. And a correlation signal processing means for detecting a low-level interfering wave component contained in the input signal by removing the correlation characteristic component held by the correlation characteristic holding means from the OFDM transmission signal relay. apparatus. 14. Reception means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal, and OFD received by this means.
An OFDM transmission signal relay apparatus comprising: a transmission means for retransmitting an M transmission signal at the same frequency, wherein the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal based on a compensation amount given. And a compensating unit that removes unnecessary wave components due to multipath and outputs to the transmitting unit, and a reception signal obtained by the receiving unit is sequentially delayed by a predetermined time to detect a correlation before and after the delay. Autocorrelation detection means, interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and the interference wave obtained by this means Based on the delay time, the amplitude and phase characteristics of the interfering wave included in the received signal are obtained from the output of the compensation means, and the compensation amount given to the compensation means is obtained from the inverse characteristics. Compensation amount calculation means for storing the correlation characteristic, the interference detection means, in advance, the correlation characteristic holding means for holding the correlation characteristic detected from the input signal in the circumvention condition, and the correlation characteristic detected from the input signal Correlation signal processing means for detecting an interfering wave component having a low level contained in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means is provided.
FDM transmission signal repeater. 15. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFD received by this means.
An OFDM transmission signal relay apparatus comprising: a transmission means for retransmitting an M transmission signal at the same frequency, wherein the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal based on a compensation amount given. And a compensating unit that removes unnecessary wave components due to multipath and outputs to the transmitting unit, and a reception signal obtained by the receiving unit is sequentially delayed by a predetermined time to detect a correlation before and after the delay. Autocorrelation detection means, interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and the interference wave obtained by this means Based on the delay time, the amplitude and phase characteristics of the interfering wave included in the received signal are obtained from the output of the compensation means, and the compensation amount given to the compensation means is obtained from the inverse characteristics. And a signal component detecting unit for detecting whether or not the received signal of the OFDM transmission signal includes a signal component, and this unit detects that the signal component is not included. An OFDM transmission signal relay device, characterized in that the compensation process of the compensation means is stopped when this occurs. 16. Reception means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal, and OFD received by this means
An OFDM transmission signal relay apparatus comprising: a transmission means for retransmitting an M transmission signal at the same frequency, wherein the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal based on a compensation amount given. And a compensating unit that removes unnecessary wave components due to multipath and outputs to the transmitting unit, and a reception signal obtained by the receiving unit is sequentially delayed by a predetermined time to detect a correlation before and after the delay. Autocorrelation detection means, interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and the interference wave obtained by this means Based on the delay time, the amplitude and phase characteristics of the interfering wave included in the received signal are obtained from the output of the compensation means, and the compensation amount given to the compensation means is obtained from the inverse characteristics. And a compensation amount calculation unit for detecting an abnormality in the input signal, and when the abnormality is detected by this unit, the relay output is attenuated or cut off. An OFDM transmission signal relay device comprising output control means. 17. Reception means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFD received by this means.
An OFDM transmission signal relay apparatus comprising: a transmission means for retransmitting an M transmission signal at the same frequency, wherein the reception signal obtained by the reception means is input, and the amplitude and phase characteristics of the reception signal based on a compensation amount given. And a compensating unit that removes unnecessary wave components due to multipath and outputs to the transmitting unit, and a reception signal obtained by the receiving unit is sequentially delayed by a predetermined time to detect a correlation before and after the delay. Autocorrelation detection means, interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal and the delay time obtained by this means, and the interference wave obtained by this means Based on the delay time, the amplitude and phase characteristics of the interfering wave included in the received signal are obtained from the output of the compensation means, and the compensation amount given to the compensation means is obtained from the inverse characteristics. OFDM transmission characterized by comprising: a compensation amount calculating means for reducing the amount of out-of-band components in the retransmitted signal when the retransmitted signal is generated from the signal obtained by the compensating means. Signal relay device. 18. Receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and OFD received by this means
An OFDM transmission signal relay apparatus comprising: a transmission means for retransmitting an M transmission signal at the same frequency, wherein a reception signal obtained by the reception means is input, and a reception signal on the frequency axis of the reception signal is provided based on a given compensation amount. Compensation means that wraps around by compensating for position, amplitude, and phase characteristics, removes unnecessary wave components due to multipath and outputs to the transmission means, and delays the reception signal obtained by the reception means by sequentially delaying by a predetermined time. Autocorrelation detecting means for detecting the front-back correlation, interference detecting means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal obtained by this means and the delay time, Correlation detection of the output of the compensating means is performed in the vicinity of the interference wave detection timing based on the obtained delay time of the interference wave, and integration processing is performed to obtain amplitude and phase characteristics, and vice versa. Position on the frequency axis of the interference wave included in the received signal from the characteristics,
Comprising: Compensation amount computing means for computing amplitude and phase and sending it to the compensating means as compensation amount.
DM transmission signal relay device. 19. The compensation amount calculation means is configured to previously perform the OFD.
Correlation characteristic holding means for holding the correlation characteristic uniquely determined by the frequency component of the M transmission signal, and excluding the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristics detected by the autocorrelation calculation means. 19. The OFD according to claim 18, further comprising: correlation signal processing means for detecting an interfering wave component having a low level included in the input signal.
M transmission signal repeater. 20. The interference detection means is configured to previously use the OFDM.
By removing the correlation characteristic holding unit that holds the correlation characteristic uniquely determined by the frequency component of the transmission signal, and the correlation characteristic component held by the correlation characteristic holding unit from the correlation characteristic detected by the autocorrelation calculation unit, 19. The OFDM according to claim 18, further comprising: correlation signal processing means for detecting an interfering wave component having a low level included in the input signal.
Transmission signal repeater. 21. The compensation amount computing means holds in advance a correlation characteristic holding means for holding a correlation characteristic detected from an input signal in a non-wraparound condition, and the correlation characteristic holding means from a correlation characteristic detected from an input signal. 19. The OFDM transmission signal relay according to claim 18, further comprising: correlation signal processing means for detecting an interfering wave component having a low level included in the input signal by removing the component of the correlation characteristic held in the above. apparatus. 22. The interference detecting means includes a correlation characteristic holding means for holding a correlation characteristic detected from an input signal in advance in a non-wraparound condition, and the correlation characteristic holding means based on a correlation characteristic detected from an input signal. 19. The OFDM transmission signal relay apparatus according to claim 18, further comprising: a correlation signal processing unit that detects a low-level interfering wave component included in the input signal by removing the retained correlation characteristic component. . 23. Further, a signal component detecting means for detecting whether or not the received signal of the OFDM transmission signal contains a signal component is provided, and when it is detected by this means that no signal component is included. 19. The OFDM transmission signal relay apparatus according to claim 18, wherein the compensation processing of the compensation means is stopped. 24. The compensation amount calculation means comprises an abnormality detection means for detecting an abnormality in an input signal, and further comprises an output control means for attenuating or interrupting the relay output when the abnormality is detected by this means. The OFDM transmission signal relay apparatus according to claim 18, wherein 25. A band limiting filter for suppressing an out-of-band component from the retransmitted signal when the retransmitted signal is generated from the signal obtained by the compensating means. OFDM transmission signal repeater. 26. The compensation amount calculation means has a delay time set according to an expected multipath delay time, delay means for delaying an input signal, and amplitude and phase components of the signal delayed by this means. 26. An FIR filter for compensating for O is included in the O according to any one of claims 1 to 25.
FDM transmission signal repeater. 27. An OFDM comprising: receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal; and demodulation means for FFT processing the reception signal obtained by the receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, from the relationship between the correlation detection signal and delay time obtained by this means, autocorrelation calculating means for sequentially delaying the received signal obtained by the receiving means by a predetermined time to obtain the correlation before and after the delay. A compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal and a compensation amount from the inverse characteristic, and a wraparound by compensating the amplitude and phase characteristics of the received signal based on the compensation amount obtained by this means. , And a compensating means for removing an unnecessary wave component due to multipath and outputting to the demodulating means, wherein the compensation amount computing means preliminarily matches the frequency component of the OFDM transmission signal. The correlation characteristic holding means for holding the correlation characteristic determined by the above, and the level included in the input signal by removing the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic detected by the autocorrelation calculating means. And a correlation signal processing means for detecting an interfering wave component having a small value. 28. An OFDM comprising: receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal; and demodulation means for FFT processing the reception signal obtained by the receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, from the relationship between the correlation detection signal obtained by this means and the delay time, an autocorrelation calculating means for sequentially delaying the received signal obtained by the receiving means by a predetermined time and obtaining the correlation before and after the delay. A compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal and a compensation amount from the inverse characteristic, and a wraparound by compensating the amplitude and phase characteristics of the received signal based on the compensation amount obtained by this means. Compensation means for removing unnecessary wave components due to multipath and outputting to the demodulation means, wherein the compensation amount calculation means detects in advance from an input signal in a sneak-free condition. By removing the correlation characteristic holding means for holding the correlation characteristic to be output, and the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic detected from the input signal, interference of a low level included in the input signal An OFDM transmission signal receiving apparatus, comprising: a correlation signal processing means for detecting a wave component. 29. An OFDM comprising: reception means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal; and demodulation means for FFT processing the reception signal obtained by this reception means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, from the relationship between the correlation detection signal obtained by this means and the delay time, an autocorrelation calculating means for sequentially delaying the received signal obtained by the receiving means by a predetermined time and obtaining the correlation before and after the delay. A compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal and a compensation amount from the inverse characteristic, and a wraparound by compensating the amplitude and phase characteristics of the received signal based on the compensation amount obtained by this means. Compensating means for removing unnecessary wave components due to multipath and outputting to the demodulating means, and detecting whether or not a signal component is included in the received signal of the OFDM transmission signal An OFDM transmission signal receiving apparatus, comprising: a signal component detecting means, wherein the compensating process of the compensating means is stopped when it is detected that the signal component is not included. 30. An OFDM comprising: receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal; and demodulation means for FFT processing the reception signal obtained by this receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, the received signal obtained by the receiving means is input, and the amplitude and phase characteristics of the received signal are compensated based on a given compensation amount to wrap around and remove unnecessary wave components due to multipath. Compensating means for outputting to the demodulating means, an autocorrelation calculating means for sequentially delaying the reception signal of the OFDM transmission signal compensated by this means by a predetermined time to obtain the correlation before and after the delay, and the correlation obtained by this means Compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the detection signal and the delay time, and for obtaining the amount of compensation given to the compensation means from the inverse characteristics The compensation amount calculation means includes a correlation characteristic holding means for holding a correlation characteristic uniquely determined in advance by a frequency component of the OFDM transmission signal, and the correlation characteristic holding means based on the correlation characteristic detected by the autocorrelation calculation means. 2. An OFDM transmission signal receiving apparatus, comprising: a correlation signal processing unit that detects a low-level interfering wave component included in an input signal by removing a component of the correlation characteristic held in 1. 31. An OFDM comprising a receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and a demodulation means for FFT processing the reception signal obtained by the receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, the received signal obtained by the receiving means is input, and the amplitude and phase characteristics of the received signal are compensated based on a given compensation amount to wrap around and remove unnecessary wave components due to multipath. Compensating means for outputting to the demodulating means, an autocorrelation calculating means for sequentially delaying the reception signal of the OFDM transmission signal compensated by this means by a predetermined time to obtain the correlation before and after the delay, and the correlation obtained by this means Compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the detection signal and the delay time, and for obtaining the amount of compensation given to the compensation means from the inverse characteristics The compensation amount calculating means comprises: a correlation characteristic holding means for holding a correlation characteristic detected from an input signal in advance in a non-wraparound condition; and a correlation characteristic holding means holding the correlation characteristic from a correlation characteristic detected from an input signal. An OFDM transmission signal receiving apparatus, comprising: a correlation signal processing unit that detects a low-level interfering wave component included in an input signal by removing a component having the correlated characteristic described above. 32. An OFDM comprising a receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal and a demodulation means for FFT processing the reception signal obtained by the receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, the received signal obtained by the receiving means is input, and the amplitude and phase characteristics of the received signal are compensated based on a given compensation amount to wrap around and remove unnecessary wave components due to multipath. Compensating means for outputting to the demodulating means, an autocorrelation calculating means for sequentially delaying the reception signal of the OFDM transmission signal compensated by this means by a predetermined time to obtain the correlation before and after the delay, and the correlation obtained by this means Compensation amount calculation means for obtaining the amplitude and phase characteristics of the received signal from the relationship between the detection signal and the delay time, and for obtaining the amount of compensation given to the compensation means from the inverse characteristics A signal component detecting means for detecting whether or not the received signal of the OFDM transmission signal contains a signal component, and when this means detects no signal component, An OFDM transmission signal receiving apparatus, characterized in that a compensation process is stopped. 33. An OFDM comprising a receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal, and a demodulation means for FFT processing the reception signal obtained by the receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, the received signal obtained by the receiving means is input, and the amplitude and phase characteristics of the received signal are compensated based on a given compensation amount to wrap around and remove unnecessary wave components due to multipath. Compensating means for outputting to the demodulating means, auto-correlation detecting means for sequentially delaying the received signal obtained by the receiving means by a predetermined time to detect correlation before and after delay, and correlation detection signal and delay obtained by this means. Based on the interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship with time, and the delay time of the interference wave obtained by this means Compensation amount calculation means for obtaining the amplitude and phase characteristics of the interfering wave contained in the received signal from the output of the compensation means and for obtaining the compensation amount given to the compensation means from the inverse characteristics thereof, the compensation amount calculation means A correlation characteristic holding means for holding a correlation characteristic uniquely determined in advance by a frequency component of the OFDM transmission signal, and a correlation characteristic component held by the correlation characteristic holding means from the correlation characteristic detected by the autocorrelation calculating means And a correlation signal processing means for detecting a low-level interfering wave component included in the input signal. 34. An OFDM comprising: receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal; and demodulation means for FFT processing the reception signal obtained by this receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, the received signal obtained by the receiving means is input, and the amplitude and phase characteristics of the received signal are compensated based on a given compensation amount to wrap around and remove unnecessary wave components due to multipath. Compensating means for outputting to the demodulating means, auto-correlation detecting means for sequentially delaying the received signal obtained by the receiving means by a predetermined time to detect correlation before and after delay, and correlation detection signal and delay obtained by this means. Based on the interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship with time, and the delay time of the interference wave obtained by this means Compensation amount calculating means for determining the amplitude and phase characteristics of the interfering wave contained in the received signal from the output of the compensating means and for determining the compensation amount given to the compensating means from the inverse characteristic thereof, the interference detecting means, Correlation characteristic holding means for holding the correlation characteristic uniquely determined in advance by the frequency component of the OFDM transmission signal, and the correlation characteristic component held by the correlation characteristic holding means from the correlation characteristics detected by the autocorrelation calculation means. An OFDM transmission signal receiving apparatus comprising: a correlation signal processing unit that detects an interfering wave component included in an input signal and having a low level. 35. An OFDM comprising: receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal; and demodulation means for FFT processing the reception signal obtained by the receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, the received signal obtained by the receiving means is input, and the amplitude and phase characteristics of the received signal are compensated based on a given compensation amount to wrap around and remove unnecessary wave components due to multipath. Compensating means for outputting to the demodulating means, auto-correlation detecting means for sequentially delaying the received signal obtained by the receiving means by a predetermined time to detect correlation before and after delay, and correlation detection signal and delay obtained by this means. Based on the interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship with time, and the delay time of the interference wave obtained by this means Compensation amount calculation means for obtaining the amplitude and phase characteristics of the interfering wave contained in the received signal from the output of the compensation means and for obtaining the compensation amount given to the compensation means from the inverse characteristics thereof, the compensation amount calculation means , A correlation characteristic holding unit that holds a correlation characteristic detected from an input signal in a circumvention-free condition in advance, and removes a component of the correlation characteristic held by the correlation characteristic holding unit from the correlation characteristic detected from the input signal Thus, the OFDM transmission signal receiving device, comprising: a correlation signal processing unit that detects an interfering wave component having a low level included in the input signal. 36. An OFDM comprising a receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal, and a demodulation means for FFT processing the reception signal obtained by the receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, the received signal obtained by the receiving means is input, and the amplitude and phase characteristics of the received signal are compensated based on a given compensation amount to wrap around and remove unnecessary wave components due to multipath. Compensating means for outputting to the demodulating means, auto-correlation detecting means for sequentially delaying the received signal obtained by the receiving means by a predetermined time to detect correlation before and after delay, and correlation detection signal and delay obtained by this means. Based on the interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship with time, and the delay time of the interference wave obtained by this means Compensation amount calculating means for obtaining the amplitude and phase characteristics of the interfering wave included in the received signal from the output of the compensating means, and obtaining the compensation amount given to the compensating means from the inverse characteristic thereof, the disturbance detecting means, Correlation characteristic holding means for holding a correlation characteristic detected from an input signal in a circumvention-free condition in advance, and excluding a component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristic detected from the input signal And a correlation signal processing means for detecting a low-level interfering wave component included in the input signal.
FDM transmission signal receiving device. 37. An OFDM comprising: a receiving means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal; and a demodulation means for FFT processing the reception signal obtained by the receiving means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, the received signal obtained by the receiving means is input, and the amplitude and phase characteristics of the received signal are compensated based on a given compensation amount to wrap around and remove unnecessary wave components due to multipath. Compensating means for outputting to the demodulating means, auto-correlation detecting means for sequentially delaying the received signal obtained by the receiving means by a predetermined time to detect correlation before and after delay, and correlation detection signal and delay obtained by this means. Based on the interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship with time, and the delay time of the interference wave obtained by this means Compensation amount calculation means for obtaining the amplitude and phase characteristics of the interfering wave contained in the received signal from the output of the compensation means and for obtaining the amount of compensation given to the compensation means from the inverse characteristics, and a signal for the received signal of the OFDM transmission signal A signal component detecting means for detecting whether or not a component is included, and when this means detects that no signal component is included, the compensating process of the compensating means is stopped. An OFDM transmission signal receiving device characterized by: 38. An OFDM comprising: reception means for receiving an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal; and demodulation means for FFT processing the reception signal obtained by this reception means to demodulate the multiplexed transmission signal. In the transmission signal receiving device, the reception signal obtained by the receiving means is input, and the signal is wraparound by compensating the position, amplitude, and phase characteristics on the frequency axis of the reception signal based on the given compensation amount, and multipath Compensating means for removing unnecessary wave components and outputting to the demodulating means, autocorrelation detecting means for sequentially delaying the received signal obtained by the receiving means by a predetermined time to detect correlation before and after delay, and by this means The interference detection means for obtaining the delay time of the interference wave with respect to the main wave in the received signal from the relationship between the correlation detection signal and the delay time, and the interference wave obtained by this means. Correlation detection of the output of the compensating means is performed in the vicinity of the interfering wave detection timing based on the delay time, the amplitude and phase characteristics are obtained by integration processing, and the position on the frequency axis of the interfering wave included in the received signal from the inverse characteristics. ,
Comprising: Compensation amount computing means for computing amplitude and phase and sending it to the compensating means as compensation amount.
DM transmission signal receiving device. 39. The compensation amount calculation means is configured to previously perform the OFD.
Correlation characteristic holding means for holding the correlation characteristic uniquely determined by the frequency component of the M transmission signal, and excluding the component of the correlation characteristic held by the correlation characteristic holding means from the correlation characteristics detected by the autocorrelation calculation means. 42. The OFD according to claim 41, further comprising: a correlation signal processing unit that detects an interfering wave component having a low level included in the input signal.
M transmission signal receiving device. 40. The interference detection means is configured to advance the OFDM.
By removing the correlation characteristic holding unit that holds the correlation characteristic uniquely determined by the frequency component of the transmission signal, and the correlation characteristic component held by the correlation characteristic holding unit from the correlation characteristic detected by the autocorrelation calculation unit, 42. The OFDM according to claim 41, further comprising: correlation signal processing means for detecting an interfering wave component having a low level included in the input signal.
Transmission signal receiving device. 41. The compensation amount computing means holds, in advance, a correlation characteristic holding means for holding a correlation characteristic detected from an input signal in a non-wraparound condition, and the correlation characteristic holding means from a correlation characteristic detected from an input signal. 42. The OFDM transmission signal reception according to claim 41, further comprising: correlation signal processing means for detecting an interfering wave component included in the input signal and having a low level by removing a component of the correlation characteristic held in. apparatus. 42. The interference detecting means includes a correlation characteristic holding means for holding a correlation characteristic detected from an input signal in advance in a non-wraparound condition, and the correlation characteristic holding means based on a correlation characteristic detected from an input signal. 42. The OFDM transmission signal receiving apparatus according to claim 41, further comprising: correlation signal processing means for detecting an interfering wave component having a low level included in the input signal by removing the retained component of the correlation characteristic. . 43. Further, a signal component detecting means for detecting whether or not the received signal of the OFDM transmission signal contains a signal component is provided, and when this means detects that the signal component is not included. 42. The OFDM transmission signal receiving apparatus according to claim 41, wherein the compensation process of the compensation means is stopped.