JPH08265274A - Multiple propagation characteristic measuring device - Google Patents

Abstract

PURPOSE: To facilitate device movement at the time of measurement in a multiple propagation characteristic measuring device for measuring the propagation characteristics of a propagation line for generating multipath phasing in mobile object communication. CONSTITUTION: A transmission means 1 sends out transmission signals composed of discrete frequency spectrum components to the propagation line. A relay means 2 receives the transmission signals while moving, shifts a frequency so as not to overlap on a frequency axis for the reception signals and sends them to a reception means 3. By the movement of the relay means 2, the reception signals receives the multipath phasing. The reception means 3 incorporates an analysis device and acquires the multiple propagation characteristics of the propagation line by analyzing the signals sent from the relay means 2. Since the analysis device is provided in the reception means 3, the moving relay means 2 is turned to small-scale constitution and thus, the device movement at the time of the measurement is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple propagation characteristic measuring apparatus, and more particularly to a multiple propagation characteristic measuring apparatus for measuring the propagation characteristic of a propagation path which causes multipath fading in mobile communication.

In recent years, the development of mobile communication has been remarkable, and accordingly, a mobile communication system capable of high-speed data transmission has been demanded. In such system development, it is necessary to know the multipath characteristics in advance, and the present invention relates to an apparatus for measuring the multipath characteristics.

Generally, for example, when a mobile station is moved on a road in an urban area, the mobile station crosses the change in the electric field strength distributed on the road, so that the received voltage of the mobile station fluctuates drastically with time. So-called multipath fading occurs in the signal received by the mobile station. In a multipath propagation path in which the same transmitted wave reaches a reception point through a plurality of paths, the received electric field strength has a frequency-dependent characteristic, so that the multipath fading also has a frequency-dependent characteristic. When a wideband signal is transmitted through such a propagation path, the spectrum of the wideband signal is transformed and the quality of the transmitted signal is deteriorated.

Therefore, in order to perform high-quality, high-speed data transmission in a mobile communication system, it is necessary to measure the multiplex propagation characteristic in advance and reflect it in the system design.

[0005]

2. Description of the Related Art Conventionally, as an apparatus for measuring such multiple propagation characteristics, there has been an apparatus for measuring a delay time of multiple propagation based on a received signal. In this device, the delay profile is measured from the delay amount of the multiple wave propagation and the received power.

This conventional device for measuring the delay time of multiple propagation is premised on measuring the multiple propagation characteristics of one propagation path from one base station to one mobile station via multiple wave propagation paths. I am trying.

On the other hand, with respect to a plurality of propagation paths from a plurality of base stations arranged at different positions and transmitting transmission signals of the same band to one mobile station via each multipath propagation path, Simultaneously measured multiple propagation characteristics are required. That is, such measurement results can be used for proper arrangement of base stations, prevention of interference occurring in the same frequency band, transmission diversity, reception diversity, and the like.
Compared with the case where the measurement is performed individually for a plurality of propagation paths, the time taken for the measurement can be saved by performing the measurement at the same time. For this reason, it is required to provide an apparatus that simultaneously measures multiple propagation characteristics of a plurality of propagation paths.

In response to such a request, the present applicant has proposed the following multiple propagation characteristic measuring device (Japanese Patent Application No. 6-
206857). That is, the multipath propagation characteristic measuring apparatus generates each of the transmission waves composed of a plurality of discrete spectrum components, and the spectrum constituent components of each transmission wave overlap each other on the frequency axis of the same frequency band. Generates transmission waves that are arranged so that each does not occur, multiple transmitters placed in different spatial positions, and transmitted from each transmitter, through multiple different propagation paths and multipath in each propagation path It is composed of a movable receiving device that simultaneously receives the respective transmission waves that have undergone fading and measures the multiple propagation characteristics based on these.

[0009]

However, in the above-mentioned conventional multi-propagation characteristic measuring apparatus, the receiving apparatus becomes a large-scale facility in terms of size, weight, power supply amount, and the like.
In particular, the scale of the analysis device is large, and the weight of a receiving device incorporating the analysis device is several hundred kg or more. On the other hand, there was a circumstance that the movement of the receiving device was indispensable at the time of measurement, and the measurement was a difficult task. In particular, in a small-scale cordless telephone system that is supposed to be used indoors, it is a more difficult task when performing such a measurement.

Also in the conventional apparatus for measuring the delay time of multiple propagation, the scale of the receiving section is large and there is a similar problem. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a multiplex propagation characteristic measuring device that facilitates device movement during measurement.

[0011]

In order to achieve the above object, the present invention, as shown in FIG. 1, includes transmitting means 1 for transmitting a transmission signal composed of discrete frequency spectrum components to a propagation path, and position movement. It is possible, and the relay means 2 receives the transmission signal from the transmission means 1 through the propagation path, shifts the frequency so as not to overlap the reception signal on the frequency axis, and transmits the frequency-shifted signal.
And a receiving unit 3 for receiving a transmission signal from the relay unit 2, converting the time axis to the frequency axis, and analyzing the multiplex propagation characteristic. It

[0012]

With the above-mentioned structure, the transmitting means 1 sends the transmission signal composed of the discrete frequency spectrum components to the propagation path. The relay means 2 receives this transmission signal while moving, and frequency-shifts the reception signal so that it does not overlap on the frequency axis and sends it to the reception means 3. As the relay means 2 moves, the received signal undergoes multipath fading. The receiving means 3 has a built-in analysis device and analyzes the signal sent from the relay means 2 to acquire the multiple propagation characteristics of the propagation path.

Since the analyzing device is provided in the receiving means 3, the moving relay means 2 has a small structure, and thus the device movement during measurement becomes easy.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described.

FIG. 2 is a block diagram showing the configuration of the first embodiment. In the figure, the transmitter 4 corresponds to the transmitter 1 of FIG. 1, the relay device 5 corresponds to the relay 2 of FIG. 1, and the receiver 6 corresponds to the receiver 3 of FIG. The transmitter 4 includes a code generator 4a that generates a spread signal, a modulator 4b that modulates a carrier wave with the spread signal, and a transmitter 4c that sends the modulated wave to be modulated to a spatial propagation path. . The transmission signal output from the transmission unit 4c includes discrete frequency spectrum components.

The relay device 5 is a device whose position can be moved. The relay device 5 receives a transmission signal from the transmission device 4 via a propagation path, a frequency shifter 5b for frequency shifting the received signal, and a shifter. Power amplification of the signal
It is composed of a transmission unit 5c for transmitting to the transmission line. The frequency shifter 5b shifts the frequency of the received signal,
The shifted signal should not overlap the received signal on the frequency axis. The detailed configuration of the frequency shift unit 5b will be described later with reference to FIG.

The reception device 6 receives the transmission signal from the relay device 5 and shifts the frequency of the reception signal to a frequency suitable for analysis (for example, 10 MHz at maximum), and the frequency-shifted signal. Fast Fourier transform (FF
The frequency conversion unit 6b that performs T) to convert the spectrum on the frequency axis and the analysis unit 6c that analyzes the spectrum on the frequency axis to obtain the multiplex propagation characteristic.

The transmitting device 4 and the receiving device 6 are installed at substantially the same position, and the relay device 5 is moved in a space to be measured by mobile communication. The transmitter 4 enables radio wave transmission up to millimeter waves in the 100 GHz band.

FIG. 3 is a block diagram showing the internal structure of the relay device 5, and particularly shows the detailed structure of the frequency shifter 5b. That is, the frequency shift unit 5b includes the MIX unit 5ba.
And a local oscillation unit 5bb and a selection unit 5bc, the local oscillation unit 5bb oscillates a local oscillation signal of a predetermined frequency,
Based on this, the MIX unit 5ba performs mixing, and the selection unit 5bc extracts only the signal of the desired frequency. By appropriately selecting the predetermined frequency of the local oscillation signal oscillated by the local oscillation unit 5bb, the shifted signal band does not overlap the received signal band.

FIG. 4 is a diagram showing the frequency spectrum of the signal of each part of the first embodiment. (A) shows the transmission spectrum S1 of the transmission device 4, (B) shows the reception spectrum S2 and the transmission spectrum S3 of the relay device 5, and (C).
Represents the reception spectrum S4 of the receiving device 6. That is, in the transmission spectrum S1 of the transmitter 4,
Assuming that there are spectrum components of power values P _{1 to} P _{n in} the frequencies f _{1 to} f _n , the transmission spectrum S1 of the transmitter 4
Is represented by the following equation.

[0021]

[Number 1] _{S1 = (P 1, P 2} , ··· P n) ··· (1) downlink channel characteristics with respect to frequency f ₁ ~f _n from the transmitter 4 to the relay device 5 g ₁ ~ If g _n , the reception spectrum S2 of the relay device 5 is given by the following equation.

[0022]

[Number 2] _{S2 = (g 1 P 1,} g 2 P 2, ··· g n P n) When (2) a transmission / reception power ratio of the relay device 5 G _c, the relay device 5 The transmission spectrum S3 is expressed by the following equation.

[0023]

Equation 3] _{S3 = G c × (g 1} P 1, g 2 P 2, ··· g n P n) ··· (3) The transmission spectrum S3 is received by the shift amount of the frequency shift unit 5b It is far from spectrum S2.

Frequency f from relay device 5 to receiving device 6
When the uplink propagation path characteristic and r ₁ ~r _n for ₁ ~f _n, reception spectrum S4 in the receiving device 6 is as follows.

[0025]

Equation 4] _{S4 = G c × (r 1} g 1 P 1, r 2 g 2 P, ··· r n g n P n) ··· (4) analysis unit 6c of the receiving device 6 receives spectrum S4 is based on analyzes downlink propagation path characteristic g ₁ to g _n and uplink propagation path characteristic r ₁ ~r _n. Incidentally, by providing the transmitting device 4 and the receiving apparatus 6 at substantially the same position, the downstream propagation path characteristic g ₁ to g _n and uplink propagation path characteristic r ₁ ~r
_{Since n} and _n are almost the same, it is equivalent to measuring the propagation path characteristics by passing the same multiplex propagation path twice. As a result, the sensitivity of the propagation path characteristic measurement can be increased.

As described above, in the first embodiment, since the receiving means 3 is provided with the analyzing device, the moving relay means 2 has a small structure, and thus the movement of the device at the time of measurement is prevented. It will be easier.

Next, the second embodiment will be described. Second
The configuration of this embodiment is basically the same as that of the first embodiment. In particular, the transmitting device 4 and the receiving device 6 have exactly the same configuration, and therefore illustration and description thereof are omitted.

FIG. 5 is a block diagram showing the internal structure of the relay device of the second embodiment. In the figure, the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the second embodiment, the frequency shifter comprises two sets of frequency shifters. That is, the local oscillating unit 9 oscillates a local oscillating signal having a first predetermined frequency, the MIX unit 8 performs mixing based on the local oscillating signal, and the selecting unit (FIL) 10 sets the frequency of the received signal and the first predetermined frequency. Only the signal of the sum or difference frequency of is extracted. Next, the local oscillating unit 12 oscillates a local oscillating signal having a second predetermined frequency, which is slightly lower than the first predetermined frequency, and the MIX unit 11 performs mixing on the basis of the local oscillating signal.
The selection unit (FIL) 13 extracts only the signal of the difference or sum frequency between the previous sum or difference frequency and the second predetermined frequency.

FIG. 6 is a diagram showing the spectrum arrangement of the signals of the respective parts of the repeater. That is, (A) is the receiving unit 5a
The spectrum of the received signal of is shown. (B) shows the spectrum of the signal output by the selection unit 13 of the relay device. The spectrum components of this signal are arranged at positions where they do not overlap with the spectrum components of the received signal shown in (A). (C) represents the spectrum of the signal received by the receiving device 6, which is the sum of the transmitting spectrum of the transmitting device 4 and the transmitting spectrum of the relay device. The receiving device 6 extracts and analyzes only each spectrum component [corresponding to FIG. 6 (B)] after the frequency shift by the relay device.

As described above, in the second embodiment, as shown in FIG. 6, the relay device arranges the frequency band of the transmission signal after the frequency shift in substantially the same band as the frequency band at the time of reception. There is. Therefore, when measuring the multiple propagation characteristic in the communication system of the ping-pong transmission system (for example, digital cordless telephone), the multiple propagation characteristic measuring device of the second embodiment is effective. That is, in the ping-pong transmission method, transmission and reception are alternately performed in time division using the same frequency band, and the multiplex propagation characteristic measuring apparatus of the second embodiment provides a measuring method according to such a communication mode. is there.

Of course, also in the second embodiment, since the receiving device 3 is provided with the analyzing device, the device can be easily moved during the measurement. The configuration of the frequency shift unit of the relay device of the second embodiment may be that shown in FIG. 7 or 8.

That is, in FIG. 7, a MIX section 15 and a shift frequency oscillating section 14 are provided instead of the local oscillating section 12 shown in FIG. The shift frequency oscillator 14 generates a signal having a frequency corresponding to the difference between the first predetermined frequency and the second predetermined frequency. The MIX unit 15
The local oscillator 9 mixes with the local oscillation signal of the first predetermined frequency. Thereby, the MIX unit 15 can supply the signal of the second predetermined frequency to the MIX unit 11.

The circuit shown in FIG. 7 can be constructed with only one local oscillator 9 which requires highly accurate local oscillation. FIG.
Then, instead of the local oscillators 9 and 12 shown in FIG.
The L sections 16 and 17 and the reference oscillation section 18 are provided. PLL
The section 16 oscillates a signal of the first predetermined frequency based on the reference oscillation signal of the reference oscillating section 18, and the PLL section 17 oscillates the second predetermined frequency based on the reference oscillation signal of the reference oscillating section 18. It oscillates a frequency signal. Also in this case, it is possible to configure only one reference oscillating unit 18 that requires highly accurate oscillation.

Next, the third embodiment will be described. Third
The configuration of this embodiment is basically the same as that of the first embodiment. In particular, the transmitting device 4 and the receiving device 6 have exactly the same configuration, and therefore illustration and description thereof are omitted.

FIG. 9 is a block diagram showing the internal structure of the relay device according to the third embodiment. In the figure, the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the third embodiment, the received signal received by the receiver 5a is MIX.
Sent to parts 20, 21. This received signal is expressed by the following equation.

[0036]

[Equation 5] R (t) = Σr _n sin (ω _n t + θ _n ), (n = −n to + n) (5) On the other hand, based on the local oscillation signal oscillated by the local oscillation unit 22,
The 90 ° distribution unit 23 outputs the signal L represented by the following equation (6).
_I (t) is created and sent to the MIX unit 20, and a signal L _Q (t) represented by the following equation (7) is created and the MIX unit 21 is created.
Send to.

[0037]

(6) L _I (t) = sin ω _m t (6)

[0038]

## EQU00007 ## L _Q (t) = cos ω _m t (7) The MIX unit 20 amplitude-modulates the received signal R (t) based on the signal L _I (t) and is expressed by the following equation. The signal S _I (t) is output.

[0039]

S _I (t) = {Σr _n sin (ω _n t + θ _n )} (1 + α sin ω _m t), (n = −n to + n) (8) where α is the AM modulation degree Represents

The MIX section 21 amplitude-modulates the received signal R (t) based on the signal L _Q (t) to obtain a signal S _Q represented by the following equation.
Output (t).

[0041]

S _Q (t) = {Σr _n sin (ω _n t + θ _n )} (1 + α cos ω _m t), (n = −n to + n) (9) The subtraction unit 24 outputs the signal. The carrier is suppressed by calculating the difference between S _I (t) and the signal S _Q (t). After that, the selection unit (FIL) 2
The signal T (t) output from the transmission unit 5c via 5 is as follows.

[0042]

Equation 10] _{T (t) = AΣαr n {} sin (ω n t -ω m t + θ n + 3π / 4) -sin (ω n t + ω m t + θ n + π / 4)}, (n = -n~ + N) ... (10) However, A is the gain of the transmission part 5c.

The following restrictions are required as a condition that each spectrum of the signal T (t) does not overlap with each spectrum of the received signal R (t).

[0044]

Ω _n −ω _n−1 > 2ω _m , (n = −n to + n) (11) If the local oscillation unit 22 oscillates a local oscillation signal satisfying such a condition, the transmission unit Each spectrum of the signal T (t) output from 5c does not overlap with each spectrum of the received signal R (t). Thus, in the third embodiment, the transmission / reception signals of the relay device can be prevented from overlapping with a simple configuration.

Next, the fourth embodiment will be described. Fourth
The configuration of this embodiment is basically the same as that of the first embodiment. In particular, the transmitting device 4 and the receiving device 6 have exactly the same configuration, and therefore illustration and description thereof are omitted.

FIG. 10 is a block diagram showing the internal structure of the repeater according to the fourth embodiment. In the figure, the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Fourth
In this embodiment, the received signal received by the receiving unit 5a is 90
Delivered to the MIX units 28 and 29 via the distribution unit 27. The signal R _I (t) sent to the MIX unit 28 is expressed by the following equation.

[0047]

## EQU12 ## R _I (t) = Σr _n sin (ω _n t + θ _n ), (n = −n to + n) (12) The signal R _Q (t) sent to the MIX unit 29 is expressed by the following equation. It is expressed as.

[0048]

R _Q (t) = Σr _n cos (ω _n t + θ _n ), (n = −n to + n) (13) On the other hand, based on the local oscillation signal generated by the local oscillation unit 30, ,
The 90 ° distribution unit 31 outputs the signal L _I represented by the following equation (14).
(t) is created and sent to the MIX section 28, and at the same time, a signal L _Q (t) represented by the following equation (15) is created and the MIX section 2 is generated.
Send to 9.

[0049]

(14) L _I (t) = sin ω _m t (14)

[0050]

L _Q (t) = cos ω _m t (15) The MIX unit 28 amplitude-modulates the signal R _I (t) based on the signal L _I (t) and is expressed by the following equation. The signal S _I (t) is output.

[0051]

S _I (t) = {Σr _n sin (ω _n t + θ _n )} (1 + α sin ω _m t), (n = −n to + n) (16) where α is the AM modulation degree Represents

The MIX section 29 converts the signal R _Q (t) into the signal L _Q.
A signal S _Q (t) expressed by the following equation after amplitude modulation based on (t)
Is output.

[0053]

## EQU17 ## S _Q (t) = {Σr _n cos (ω _n t + θ _n )} (1 + α cos ω _m t), (n = −n to + n) (17) The sum of _I (t) and the signal S _Q (t) is calculated to suppress the upper sideband and leave the carrier. Then, the signal T (t) output from the transmission unit 5c via the selection unit (FIL) 33 is as follows.

[0054]

T (t) = AΣ {r _n sin (ω _n t + θ _n ) + r _n αcos (ω _n t + θ _n −ω _m t)}, (n = −n to + n) (18) However, A is the gain of the transmitter 5c.

It should be noted that the synthesizing unit 32 uses the signals S _I (t) and S
By calculating the difference from _Q (t), the lower sideband can be suppressed (the carrier wave remains). The following restrictions are required as a condition that each spectrum of the signal T (t) does not overlap with each spectrum of the received signal R (t) [= _RI (t)].

[0056]

Ω _n −ω _n−1 > ω _m , (n = −n to + n) (19) If the local oscillation unit 30 oscillates a local oscillation signal satisfying such a condition, the transmission unit Each spectrum of the signal T (t) output from 5c does not overlap with each spectrum of the received signal R (t). Thus, in the fourth embodiment, the transmission / reception signals of the relay device can be prevented from overlapping with a simple configuration.

Next, the fifth embodiment will be described. Fifth
The configuration of this embodiment is basically the same as that of the first embodiment. In particular, since the receiving device 6 has exactly the same configuration, its illustration and description are omitted.

FIG. 11 is a block diagram showing the internal structure of the transmitter of the fifth embodiment. In the figure, the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Fifth
In this embodiment, a local oscillator 35 and a combiner 36 are newly provided as compared with the first embodiment. Local oscillator 35
Oscillates a frequency slightly apart from the frequency band of the modulated wave output by the modulator 4b, and the synthesizer 36 modulates the unmodulated signal generated by the local oscillator 35 and the modulated signal output by the modulator 4b. Combine with waves.

FIG. 12 is a block diagram showing the internal structure of the repeater according to the fifth embodiment. In the figure, the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Fifth
In this embodiment, the separation unit 37 separates the non-modulated signal S5 and the modulated wave S6 included in the received signal into the non-modulated signal S5.
To the local signal generating section 38 and the modulated wave S6 to the MIX section 39. The local signal generation unit 38 generates a local oscillation signal S7 of the same frequency based on the non-modulated signal S5, and the MIX unit 3
Send to 9. The MIX unit 39 performs mixing, and sends the frequency-shifted signal S8 to the transmitting unit 5c via the selecting unit (FIL) 40.

FIG. 13 shows the signal spectrum of each part of the repeater. (A) is the output of the receiving unit 5a, (B) is the input of the MIX unit 39, (C) is the input of the local signal generating unit 38,
(D) is the output of the local signal generator 38, and (E) is the transmitter 5.
It is the signal spectrum of the input of c.

As described above, the unmodulated signal S is transmitted from the transmitter 4.
5 is transmitted, and the repeater performs frequency shift based on the unmodulated signal S5. Therefore, in the relay device, the local signal generator that requires high stability can have a simple structure, the miniaturization of the relay device is promoted, and the relay device is more easily moved. In addition, the accuracy of the relative frequency interval between the local oscillation frequency and the modulated wave is improved.

The local signal generating section 38 may be constructed of a bandpass filter and an AGC amplifier, or a bandpass filter and a limiter amplifier, and further, a bandpass filter and a P-type.
Either an LL oscillator is used.

In the above fifth embodiment, the local signal generator 38 generates the local oscillation signal S7 of the same frequency based on the non-modulated signal S5, but instead of this, the local signal generator 3 is used.
8 may generate local oscillation signals of different frequencies based on the unmodulated signal S5. In this case, the frequency of the local oscillation signal can be arbitrarily set in the relay device. In this case, the local signal generating section 38 is configured with a bandpass filter and a frequency dividing circuit, a bandpass filter and a frequency multiplying circuit, or a bandpass filter and a PLL oscillator. , Or either.

Next, the sixth embodiment will be described. Sixth
This embodiment is a combination of the second embodiment and the fifth embodiment. Since the configuration of the sixth embodiment is basically the same as that of the fifth embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted. In particular, the transmitter and the receiver have exactly the same configuration.

FIG. 14 is a block diagram showing the internal structure of the repeater according to the sixth embodiment. Compared to the fifth embodiment, the sixth embodiment is provided with a local signal generator 42 that outputs two types of local oscillation signals having different frequencies and two sets of frequency shifters.

The separating section 37 separates the non-modulated signal S5 and the modulated wave S6 contained in the received signal, sends the non-modulated signal S5 to the local signal generating section 42, and outputs the modulated wave S6 to the MIX section 4.
Send to 3. The local signal generation unit 42 generates a local oscillation signal S9 of the same frequency based on the non-modulated signal S5, and the MIX unit 43
And the local oscillation signal S1 of slightly different frequency
1 is generated and sent to the MIX unit 45. The MIX section 43 performs mixing on the basis of the local oscillation signal S9, and selects the selection section (FI
L) 44 takes out only the signal S10 having the sum frequency. Next, the MIX unit 45 performs mixing based on the local oscillation signal S11, and the selection unit (FIL) 46 extracts only the signal S12 having the difference frequency.

Although the frequency of the local oscillation signal S9 is the same as the frequency of the unmodulated signal S5 in the above embodiment, it may be different. FIG. 15 is a diagram showing a spectrum arrangement of signals in each unit of the relay device. That is, (A) is the output of the receiving unit 5a, (B) is the input of the MIX unit 43,
(C) is an input to the local signal generator 42, (D) is an input from the local signal generator 42 to the MIX unit 43, and (E) is a MIX.
Input to the section 45, (F) is from the local signal generating section 42 to MIX
Input to the unit 45, (G) is the signal spectrum of the input of the transmitting unit 5c.

FIG. 16 shows two types of internal configurations of the local signal generator 42. In FIG. 16A, the bandpass filter 42a is shown.
Based on the unmodulated signal S5 of frequency f ₀ input via
A local oscillation signal S9 having the same frequency f ₁ is generated and sent to the MIX section 43, and at the same time the shift frequency oscillation section 42b, MI
The X section 42c and the selection section 42d generate a local oscillation signal S11 having a slightly different frequency f ₂ , and the MIX section 45
Send to.

Further, in FIG. 16B, the unmodulated signal S of the frequency f ₀ input through the bandpass filter 42e.
Based on 5, local oscillation signals of frequencies f ₁ and f ₂ different from the frequency f ₀ are respectively generated by the two PLL circuits 42f and 42g.

Thus, in the sixth embodiment, the transmitter 4
Transmits the unmodulated signal S5, a highly accurate local oscillation signal can be obtained. Moreover, since two sets of frequency shift units are used in the relay device, it is possible to measure the propagation characteristics in the same frequency band.

Next, the seventh embodiment will be described. Seventh
The configuration of this embodiment is basically the same as that of the first embodiment. In particular, since the receiving device 6 has exactly the same configuration, its illustration and description are omitted.

FIG. 17 is a block diagram showing the internal structure of the transmitting apparatus according to the seventh embodiment. In the figure, the same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the seventh embodiment, as compared with the first embodiment, two local oscillators 4 are used.
8, 49 and a combining unit 50 are newly provided. The local oscillators 48 and 49 respectively oscillate the first and second local oscillation signals whose frequencies are slightly different from each other, and the synthesizer 36
Synthesizes the unmodulated signals generated by the local oscillators 48 and 49 with the modulated wave output by the modulator 4b.

FIG. 18 is a block diagram showing the internal structure of the repeater according to the seventh embodiment. In the figure, the same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the seventh embodiment, the separating unit 51 separates two unmodulated signals and modulated waves included in the received signal, sends the two unmodulated signals to the local signal generating units 52 and 53, and also modulates them. MI the wave
Send to X section 54. The local signal generation unit 52 separates the first local oscillation signal by a bandpass filter, amplifies it, and outputs M
It is sent to the IX unit 54. In addition, the local signal generator 53 has a second
The local oscillation signal is separated by a bandpass filter, amplified, and sent to the MIX section 56. The MIX unit 54 performs mixing based on the first local oscillation signal, and the selection unit (FIL) 5
5 takes out only the signal of the sum frequency. Next, MIX
The unit 56 performs mixing based on the second local oscillation signal,
The selection unit (FIL) 57 extracts only the signals of the difference frequency.

Note that the local signal generators 52 and 53 do not perform frequency shift, but they may incorporate a PLL circuit to perform frequency shift. Next, the eighth embodiment will be described.

The structure of the eighth embodiment is basically the same as that of the first embodiment. In particular, the transmitter 4 has exactly the same configuration, so that illustration and description thereof will be omitted. FIG.
FIG. 14 is a block diagram showing an internal configuration of a relay device of an eighth embodiment. In the eighth embodiment, two receiving units 59a and 59 are provided.
b is the signal S1 of the same frequency from the same transmitter 4.
3, respectively. Two local oscillators 61a, 61
b outputs local oscillation signals of slightly different frequencies, and the two MIX units 60a and 60b respectively perform mixing. Then, the two selection units 62a and 62
b respectively selects the sum frequency. Transmitter 63
Is the two signals S1 sent from the selectors 62a and 62b.
4, S15 is transmitted from one antenna to the receiving device. Local oscillators 61a and 61b, MIX units 60a and 6
0b and the selection units 62a and 62b constitute two frequency shift units, and by appropriately setting the frequencies of the two local oscillation signals, each signal after frequency shift can be applied to the reception signal S13, It is possible not to overlap each other on the frequency axis.

This is shown in FIG. 21 shows the signal spectrum of each part of the relay device, (A) shows the signal S13 received by the two receiving parts 59a, 59b, and (B) shows the signal by the local oscillating part 61a, the MIX part 60a, and the selecting part 62a. Signal S14 after S13 is frequency-shifted
(C) is a signal S15 after the signal S13 is frequency-shifted by the local oscillator 61b, the MIX unit 60b, and the selector 62b, and (D) is a signal output from the transmitter 63 (2).
Two signals S14 and S15 are shown.

FIG. 20 is a block diagram showing the internal structure of the receiving apparatus according to the eighth embodiment. In the eighth embodiment, the two receivers 64a and 64b respectively receive the signals S14 and S15 from the transmitter 63 of the relay device, and the local oscillator 65 is provided.
Frequency shift is performed by each local oscillation signal from a and 65b. These local oscillation signals are set to frequencies such that the spectra of the signals received by the two receivers 64a and 64b do not overlap each other. The two frequency conversion units 66a and 66b respectively perform a fast Fourier transform (FFT) on each frequency-shifted received signal to convert it into a spectrum on the frequency axis. The synthesizer 67 synthesizes the spectra from the frequency converters 66a and 66b. Local oscillators 65a and 65b
By appropriately selecting the frequencies of the local oscillation signals generated by the above, the synthesized spectra do not overlap. The analysis unit 68 analyzes the combined spectrum and acquires the multiple propagation characteristic.

In the eighth embodiment as described above, the reception space diversity characteristic can be measured. In the eighth embodiment, only one analyzing unit 68 of the receiving device is provided, but instead of this, the synthesizing unit 67 is eliminated and two analyzing units are provided, and each of the receiving units 64a and 64b is provided. Analysis may be performed. Further, a plurality of analysis units may be provided to share the frequency analysis range.

Next, the ninth embodiment will be described. Ninth
The configuration of this embodiment is basically the same as that of the first embodiment. In particular, since the receiving device 6 has exactly the same configuration, its illustration and description are omitted.

FIG. 22 is a block diagram showing two transmitters and relays of the ninth embodiment. In the figure, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The two transmitters 70 and 71 are respectively the code generator 4a, the modulator 4b and the transmitter 4c of the first embodiment.
Although the code generators 70a and 71a, the modulators 70b and 71b, and the transmitters 70c and 71c corresponding to (FIG. 2) are provided, the modulators 70b and 71b perform modulation by respective carriers having different frequencies. Therefore, the transmitter 70
c and 71c respectively output the spectrums at the frequency positions shown in FIGS. 23 (A) and 23 (B). FIG. 23 is a diagram showing a signal spectrum arrangement in each part of the ninth embodiment.

The relay device receives the signal of the vector shown in FIG. 23C, which is a combination of the vector shown in FIGS. 23A and 23B. The branch unit 72 divides the signal from the selection unit 5bc into two. Frequency shift units 73a and 73b
2 frequency-shifts each of the branched signals, and
3 outputs signals as shown in (D) and (E). That is, the signals shown in FIGS. 23D and 23E are shifted so that they do not overlap with each other and do not overlap with the signals shown in FIGS. 23A and 23B. Transmitters 74a and 74b
23D respectively send the signals shown in FIGS. 23D and 23E, and the receiver 6 receives the signal having the spectrum shown in FIG. 23F.

Thus, in the ninth embodiment, the transmission space diversity characteristic can be measured. Note that FIG.
Instead of the frequency shift method shown in FIG. 24, a frequency shift method as shown in FIG. 24 in which spectral components do not overlap may be adopted. 24A to 24F correspond to FIGS. 23A to 23F, respectively. Figure 4 above
Since it is the same idea as the correspondence between FIG.

Next, the tenth embodiment will be described. The configuration of the tenth embodiment is basically the same as that of the first embodiment, and the illustration thereof is omitted. In the following description, the same reference numerals will be used for the same components.

In the tenth embodiment, the antenna of the transmitting device 4 is an omnidirectional antenna, the receiving antenna of the relay device 5 is also an omnidirectional antenna, and the transmitting antenna of the relay device 5 is to the receiving device 6. The antenna of the receiving device 6 is also a directional antenna directed to the relay device 5.

As a result, the influence of multipath fading appears on the transmission signal in the propagation path from the transmission device 4 to the relay device 5, but the influence of multipath fading occurs in the transmission signal in the propagation path from the relay device 5 to the reception device 6. I can't see it.
Therefore, multiple propagation measurement is possible only for the propagation path from the transmission device 4 to the relay device 5.

The receiving antenna of the relay device 5 may be a directional antenna, and the antenna of the receiving device 6 may be a non-directional antenna. Furthermore, the tenth
The embodiment of can be combined with the first to ninth embodiments.

Next, the eleventh embodiment will be described. FIG. 25 is a block diagram showing the structure of the eleventh embodiment.
Since the configuration of the eleventh embodiment is basically the same as that of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

In the eleventh embodiment, a cable 78 in which switches 76 and 77 and an attenuator 79 are inserted is provided between the transmitting device 4 and the receiving side of the relay device 5, and similarly,
A cable 82 having switches 80 and 81 and an attenuator 83 inserted therein is provided between the transmitting side of the relay device 5 and the receiving device 6A. By switching the switches 76, 77, 80, 81 to the positions shown in the figure, transmission is performed without passing through a spatial transmission path, in other words, without being affected by multipath fading.

The receiver 6A is provided with a difference calculation section 84 and a storage section 85. The storage unit 85 includes the switch 7
6, 77, 80, 81 are switched to the positions shown in the figure,
The frequency spectrum output from the frequency conversion unit 6b is stored when transmission is performed without being affected by multipath fading. The difference calculation unit 84 has a frequency spectrum output from the frequency conversion unit 6b when the switches 76, 77, 80, 81 are switched to positions opposite to the positions shown in the figure and transmission is performed via the spatial propagation path. Receive. Then, the difference calculation unit 84 subtracts the frequency spectrum stored in the storage unit 85, which is not affected by the multipath fading, from the frequency spectrum. The result is that the influence of the measurement system is eliminated. Based on this, the analysis unit 6c analyzes the multiple propagation characteristics.

Therefore, in the eleventh embodiment, highly accurate measurement is possible. The eleventh embodiment is the first to the first embodiment.
It is also possible to combine with the tenth embodiment.

Next, the twelfth embodiment will be described. The structure of the twelfth embodiment is basically the same as that of the first embodiment. In particular, the transmitter 4 and the relay device 5 have exactly the same configuration, so that illustration and description thereof will be omitted.

FIG. 26 is a block diagram showing the structure of the receiving apparatus according to the twelfth embodiment. In the figure, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the twelfth embodiment, the oscillating frequency control unit 87 includes the analysis unit 6
The local oscillating unit 88 is controlled according to the instruction from c to cause the local oscillating unit 88 to generate local oscillating signals L1, L2, L3 of, for example, three different frequencies as shown in FIG. The local oscillation signals L1, L2, and L3 have timing t
1, t2, t3, respectively, and are repeated again at the next timings t4, t5, t6.

It is assumed that the receiver 6a is receiving the frequency spectrum as shown in FIG. The bandwidth that can be analyzed at one time by the analysis unit 6c is relatively narrow.
It is assumed that the reception frequency spectrum shown in 7 (A) cannot be analyzed at one time. That is, FIG. 27 (A)
It is assumed that the reception frequency spectrum shown in (3) is composed of three bandwidths (D1, D2, D3) that can be analyzed by the analysis unit 6c. The reception unit 6a receives the local oscillation signal L1 at the timing t1, and as a result, as shown in FIG. 27C, only the band D1 is analyzed by the analysis unit 6 via the frequency conversion unit 6b.
c, the local oscillation signal L2 is received at the next timing t2, and as a result, as shown in FIG.
Is sent to the analysis unit 6c via the frequency conversion unit 6b, and finally, the local oscillation signal L3 is received at the timing t3. As a result, as shown in FIG. It is sent to the analysis unit 6c via. At the next timing t4, similar processing is performed on the new received signal spectrum.

As described above, in the twelfth embodiment, a plurality of local oscillation signals are prepared for each analysis cycle, whereby the same received signal can be divided into a plurality of bands and analyzed by the analysis unit 6c. By doing so, it is possible to deal with a received signal having a bandwidth exceeding the analyzable bandwidth of the analysis unit 6c.

The twelfth embodiment can be combined with the first to eleventh embodiments. Next, the first
The third embodiment will be described.

The structure of the thirteenth embodiment is basically the same as that of the first embodiment. In particular, the transmitter 4 and the relay device 5 have exactly the same configuration, so that illustration and description thereof will be omitted.

FIG. 28 is a block diagram showing the structure of the receiving apparatus according to the thirteenth embodiment. In the figure, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the thirteenth embodiment, the synthetic averaging unit 90 averages the signals converted into the frequency axis by the frequency converting unit 6b for each frequency over a predetermined time. As a result, the noise component becomes a constant value, does not depend on the frequency, and the measured power value can be smoothed.

The thirteenth embodiment can be combined with the first to twelfth embodiments. Next, the first
The fourth embodiment will be described.

The structure of the fourteenth embodiment is basically the same as that of the first embodiment. In particular, the transmitter 4 and the relay device 5 have exactly the same configuration, so that illustration and description thereof will be omitted.

FIG. 29 is a block diagram showing the structure of the receiving apparatus according to the 14th embodiment. In the figure, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the fourteenth embodiment, a power value / phase calculation unit 92 is provided after the frequency conversion unit 6b. The power value / phase calculation unit 92 includes
The I-channel signal and the Q-channel signal are input from the frequency conversion unit 6b, the power value P and the phase θ are calculated based on these, and the signals are sent to the received wave measurement unit 93. The analysis unit 94 analyzes the multiple propagation characteristics based on not only the power value but also the phase.

FIG. 30 is an internal block diagram of the analysis unit 94.
The analysis unit 94 includes an XY axis conversion unit 94a and a vector synthesis unit 94.
b and the like. In the XY-axis conversion unit 94a, the power values P _{(1) to} P _(k) and the phase θ ₍₁₎ of the spectrum constituent components of the transmission wave from the relay device 5 are received from the reception wave measurement unit 93.
~ Θ _(k) is sent. The XY axis conversion unit 94a converts these to X.
Converts each of the axis and Y-axis sought X ₍₁₎ ~X _(k) and _{Y (1) ~Y (k)} , sent to the vector combining unit 94b.

As shown in FIG. 31, the vector synthesizing unit 94b performs vector synthesizing of spectrum constituent components. That is, the X-axis value X of the composite vector of the transmission waves from the relay device 5 is (X ₍₁₎ + X ₍₂₎ + ... + X _(k) ), and the Y-axis value Y is (Y ₍₁₎ + Y _{( 2)} + ... + Y _(k) ).

Here, the difference Δθ in processing timing in the frequency converter 6b is calculated from the following equation, where Δt is the measurement interval and f is the frequency of the spectrum.

[0105]

[Delta] [theta] = [Delta] t * f (20) This [Delta] [theta] is a correction phase amount, and noise can be reduced and spectrum can be smoothed by performing vector combination a plurality of times.

The fourteenth embodiment can be combined with the first to thirteenth embodiments. Next, the first
The fifth embodiment will be described.

The structure of the fifteenth embodiment is basically the same as that of the first embodiment. In particular, the transmitter 4 and the relay device 5 have exactly the same configuration, so that illustration and description thereof will be omitted.

FIG. 32 is a block diagram showing the structure of the receiving apparatus according to the fifteenth embodiment. In the figure, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the fifteenth embodiment, although not shown, similar to the eleventh embodiment, first, a cable is directly transmitted from the transmission device 4 to the relay device 5 and then to the reception device without passing through the space transmission path. Is done. Then, the power value / phase calculation unit 96
The same operation as the power value / phase calculation unit 92 of the fourteenth embodiment is performed to obtain the power value on the frequency axis of the transmission signal and the phase correction value, which are sent to the phase storage unit 98 for storage.

The method of calculating the phase correction value is shown below. each
The power value and the phase of the spectrum of the transmitted wave are represented by (P
_R1,θ_R1)_,(P_R2,θ_R2) _,.. (P_Rn,θ_Rn)
Then, the phase difference is represented by the following formula.

[0110]

[ _Formula 21] Δθ _R1,2 = θ _R1 −θ _R2・ ・ ・ (21a) Δθ _R2,3 = θ _R2 −θ _R3・ ・ ・ (21b) ・ ・ ・ Δθ _{R (n-1), n} = θ _{R (n−1)} −θ _Rn (21n) Therefore, the average value Δθ _m of these phase differences is as follows.

[0111]

Δθ _m = [Σ (Δθ _{R (i-1), i} ) / n], (i = 2 to n) (22) Using these, the phase correction value δθ _r is It is calculated based on the following formula.

[0112]

## EQU23 ## δθ _r = (Δθ _{R (r-1), r} + Δθ _{Rr, (r + 1)} ) / 2-Δθ _m (23) The phase correction value calculated in this way is stored in the phase memory. It is stored in the unit 98 in advance.

Since Δθ _m is a constant part, it may be set to 0. The receiver measures the power value and phase of the spectrum of the transmitted wave in the same way as in the 14th embodiment. As a result, it is assumed that the measured values (P _1, θ ₁ ), (P _2, θ ₂ ), ... (P _n, θ _n ) of the power value and phase of the spectrum of the transmitted wave are obtained. Therefore, the analysis unit 6c corrects the actual measurement value using the phase correction value stored in the phase storage unit 98.
That is, for the phase difference of the measured phase, the following equation (2
4) The corrected phase difference Δθ
_{Get j, (j + 1)} .

[0114]

Δθ _{j, (j + 1)} = θ _j −θ _{(j + 1)} − (δθ _j + δθ _{(j + 1)} ) / 2 ··· (24) By performing such a correction, The influence of the measurement system is removed, and the spectrum measurement time difference is corrected. The analysis unit 6c uses such data to determine the multiple propagation characteristics.

The fifteenth embodiment can be combined with the first to eleventh embodiments. Next, the first
The sixth embodiment will be described.

The structure of the sixteenth embodiment is basically the same as that of the first embodiment. In particular, the transmitting device 4 and the relay device 5 have exactly the same configuration. In the receiving apparatus of the sixteenth embodiment, the analyzing section obtains the self-frequency correlation based on the power value corresponding to the spectrum of the received signal.

That is, when the power value of the reception spectrum of the transmission signal is P _(1), P _(2), ... P _(k) , the self-frequency correlation η (Δd) is obtained from the following equation (25). .

[0118]

(Equation 25)

However, Δd represents a frequency interval for correlation. In addition, the analysis unit obtains a transfer function based on the power value and the phase corresponding to the spectrum of the received signal.

That is, the amplitude frequency characteristic is obtained from the following equation using the Lagrange's formula.

[0121]

[Equation 26] G (f) = g ₁ (f) P ₍₁₎ (f) + g ₂ (f) P ₍₂₎ (f) + ... + g _k (f) P _(k) (f) (26) Here, f is a frequency within the transmission band. Also, g ₁ (f)
To g _k (f) is represented by the following formula.

[0122]

G _i (f) = (ff ₁ ) ・ ・ (ff _i-1 ) (ff _{i + 1} ) ・ ・ (ff _k ) / (f _i -f ₁ ) ・ ・ (f _i -f _{i −1} ) (f _i −f _{i + 1} ) ·· (f _i −f _k ) ... (27) Further, the phase characteristics are expressed by the phase difference between adjacent ones, and the following formulas (28a) and (28b ) From.

[0123]

(28) Δθ _i = (θ _i-1 -θ _i ) + (θ _i -θ _{i + 1} ) / 2 (28a) D (f) = d ₁ (f) Δθ ₍₁₎ + d ₂ (f) Δθ ₍₂₎ + ··· + d _k (f) Δθ _(k) (28b) Here, d ₁ (f) to d _k (f) are represented by the following formulas.

[0124]

D _i (f) = (ff ₁ ) ・ ・ (ff _i-1 ) (ff _{i + 1} ) ・ ・ (ff _k ) / (f _i -f ₁ ) ・ ・ (f _i -f _{i −1} ) (f _i −f _{i + 1} ) ·· (f _i −f _k ) ... (29) As a result, transfer functions of many propagation paths can be simultaneously obtained in the same transmission band.

Further, the analyzing section detects the amplitude notch distribution within the transmission band of the propagation path. The power values P _{(1) to} P _(k) of the received signal are input to the analysis unit. Based on these, the analysis unit calculates the average value P _m based on the following formula.

[0126]

[Equation 30] P _m = [ΣP _(k) ] / k, (k = 1 to k) (30) Further, the analysis unit uses the minimum power value B based on the following equation (31).
To calculate.

[0127]

[Equation 31] B = Min (P _(i) ), (i = 1 to k) (31) where Min (P _(i) ) is P at i = 1 to k.
P satisfying _(i) <P _(i-1) and P _(i) <P _{(i + 1)}
Means the value of _(i) .

The analysis unit detects the notch N based on the average value P _m and the minimum power value B calculated as described above.
That is, the minimum power value B is smaller than the average value P _m ,
Moreover, the power minimum value B that satisfies the condition that the difference is greater than or equal to the specified value and the condition that the difference between the power minimum value B and the maximum values on both sides is greater than or equal to the specified value is detected. Output as a notch N.

Thus, the amplitude notch distribution within the transmission band of the propagation path can be obtained. The sixteenth embodiment is
It is also possible to combine with the first to fifteenth embodiments.

Next, the seventeenth embodiment will be described. The structure of the seventeenth embodiment is basically the same as that of the first embodiment. In particular, the transmitter 4 and the relay device 5 have exactly the same configuration, so that illustration and description thereof will be omitted.

FIG. 33 is a block diagram showing the structure of the analyzing unit of the receiving apparatus according to the 17th embodiment. In the figure, illustration of other parts of the receiving device is omitted. P of signal spectrum
(1), P (3), P (5), ... Arranged so that there is no signal from the transmitting side in P (2), P (4), P (6) ,. Leave. The power calculator 100a calculates the signal power C by the following formula.

[0132]

[Equation 32] C = ΣP (k), (k = 1 + 2n, n = 1, 2, ...) (32) The noise power calculation unit 100b calculates the noise power N by the following formula.

[0133]

(33) N = ΣP (k), (k = 2n, n = 1, 2, ...) (33) In the C / N detection unit 101, the signal power to noise power ratio C is calculated based on these. Calculate / N.

The seventeenth embodiment can be combined with the first to sixteenth embodiments. Next, the first
The eighth embodiment will be described.

FIG. 34 is a block diagram showing the structure of the eighteenth embodiment. Since the structure of the eighteenth embodiment is basically the same as that of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

In the eighteenth embodiment, the code generator 4a of the transmitter 4 sends a frame timing signal to the delay time detector 1 of the receiver in accordance with the frame timing of the spread signal.
It is output to 04. The phase detection unit 103 of the reception unit detects the phase of the spectrum of the received signal, and the delay time detection unit 1
04 calculates an absolute delay time from the transmission device 4 via the relay device 5 from the detected phase and the frame timing signal.

That is, when the spread signal is expressed by frequency expansion, the following expression (34) is obtained.

[0138]

(Equation 34)

If the carrier frequency is ω ₀ and the carrier is BPSK-modulated with a spread signal, the modulated wave C is expressed by the following equation (3)
It becomes like 5).

[0140]

[Equation 35]

When this arrives after Δt time, the received wave C _r becomes as shown in the following expression (36).

[0142]

[Equation 36]

[0143] Here, omega (t-Delta] t) is undefined, given on the basis of the angular frequency omega _0, the spectrum of the phase theta _n at t ₀ (t ₀₎ is expressed by the following equation (37) .

[0144]

[Equation 37] θ _n (t ₀ ) = Δω · n (t ₀ −Δt) (37) By using a highly stable oscillator, the deviation of δω is Δ
If it is sufficiently smaller than ω, the absolute delay time Δt can be calculated based on the following equation (38).

[0145]

Equation 38] Delta] t = _{[θ n (t 0) -Δω ·} nt 0 ] / Δω · n ··· (38) where, t ₀ is the time relative to the frame timing.

The eighteenth embodiment can be combined with the first to seventeenth embodiments. Next, the first
The ninth embodiment will be described.

The structure of the nineteenth embodiment is basically the same as that of the first embodiment. In particular, the transmitter 4 and the relay device 5 have exactly the same configuration, so that illustration and description thereof will be omitted.

FIG. 35 is a block diagram showing the structure of the receiving apparatus according to the nineteenth embodiment. The same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the nineteenth embodiment, the receiving device has directional antennas 106a to 10a.
6n is provided. The directional antennas 106a to 106n
Are three-dimensionally arranged so as to have an omnidirectional characteristic as a whole. The receiving units 107a to 107n and the local oscillating units 108a to 108n corresponding to the directional antennas 106a to 106n, respectively.
108n are provided respectively. Local oscillators 108a-10
8n respectively generate local oscillation signals of different frequencies, and based on these, the reception units 107a to 107n respectively frequency the signals received by the respective antennas so that frequency bands do not overlap or spectrum components do not overlap. shift. The synthesizer 109 synthesizes the signals thus frequency-shifted and sends them to the frequency converter 6b.

Therefore, in the analysis unit 6c, the relay device 5
It is possible to measure multiple propagation characteristics in many propagation directions of radio waves in the propagation path from the receiver to the receiver. In the analysis unit 6c, the spectrums of the received signals from the respective antennas are power-added to reduce the influence of the propagation characteristic from the relay device 5 to the receiving device, and only the propagation characteristic from the transmitting device 4 to the relay device 5 is reduced. You may make it measure.

Further, the analyzing section 6c may analyze the correlation characteristic between the antennas from the spectrum of the received signal from each antenna. Furthermore, an omnidirectional antenna may be used instead of the directional antennas 106a to 106n.

The nineteenth embodiment can be combined with the first to eighteenth embodiments. Next, the second
An example of No. 0 will be described.

The structure of the twentieth embodiment is basically the same as that of the first embodiment. Particularly, since the relay device 5 and the receiving device 6 have exactly the same configuration, illustration and description thereof will be omitted.

FIG. 36 is a block diagram showing the structure of the transmitting apparatus according to the twentieth embodiment. The same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the twentieth embodiment, the transmitting device includes directional antennas 113a to 11a.
3n is provided. These directional antennas 113a to 113n
Are three-dimensionally arranged so as to have an omnidirectional characteristic as a whole. The transmitting units 111a to 111n and the local oscillating units 112a to 112n corresponding to the directional antennas 113a to 113n.
112n are provided respectively. Local oscillators 112a to 11
2n respectively generate local oscillation signals of different frequencies, and based on these, the transmitters 111a to 111n,
The signals from the modulator 4b are frequency-shifted so that the frequency bands do not overlap or the spectrum components do not overlap. Then, it outputs to the corresponding antenna.

Therefore, it is possible to measure multiple propagation characteristics in many radio wave transmission directions in the propagation path from the transmission device to the relay device 5. An omnidirectional antenna may be used instead of the above directional antennas 113a to 113n.

The twentieth embodiment can be combined with the first to eighteenth embodiments.

[0156]

As described above, according to the present invention, the relay means receives the transmission signal while moving, and the received signal is frequency-shifted so as not to overlap on the frequency axis to the reception means. I will send it. The receiving means has a built-in analysis device, and acquires the multiple propagation characteristic of the propagation path by analyzing the signal sent from the relay means.

As described above, since the receiving device is provided with the analyzing device, the moving relay device has a small structure, and thus the device can be easily moved during the measurement. Further, the relay means frequency-shifts the frequency-shifted signal so that each spectrum component does not overlap with each spectrum component of the reception signal by using the same band as the frequency band of the reception signal of the relay means. This provides a very suitable measurement method when measuring the multiple propagation characteristics in a ping-pong transmission type communication system using the same frequency band for transmission and reception.

Further, the relay means amplitude-modulates the received signal. This makes it possible to prevent the transmission and reception signals from overlapping with a simple configuration. Further, the transmitting means synthesizes the modulated wave and the non-modulated wave and transmits the synthesized wave, and the relay means performs frequency shift based on the non-modulated wave. Therefore, in the relay unit, the local signal generating unit, which is required to have high stability, can have a simple structure, the miniaturization of the relay unit is promoted, and the relay unit can be moved more easily.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of a first embodiment.

FIG. 3 is a configuration diagram of a relay device.

FIG. 4 is a spectrum layout diagram of each device.

FIG. 5 is a configuration diagram of a relay device according to a second embodiment.

FIG. 6 is a spectrum layout diagram in the relay device.

FIG. 7 is a configuration diagram of another relay device.

FIG. 8 is a configuration diagram of another relay device.

FIG. 9 is a configuration diagram of a relay device according to a third embodiment.

FIG. 10 is a configuration diagram of a relay device according to a fourth embodiment.

FIG. 11 is a configuration diagram of a transmission device according to a fifth embodiment.

FIG. 12 is a configuration diagram of a relay device according to a fifth embodiment.

FIG. 13 is a frequency allocation diagram of a relay device.

FIG. 14 is a configuration diagram of a relay device according to a sixth embodiment.

FIG. 15 is a frequency allocation diagram of a relay device.

FIG. 16 is a configuration diagram of a local signal generator.

FIG. 17 is a configuration diagram of a transmitter according to a seventh embodiment.

FIG. 18 is a configuration diagram of a relay device according to a seventh embodiment.

FIG. 19 is a configuration diagram of a relay device according to an eighth embodiment.

FIG. 20 is a configuration diagram of a receiving device according to an eighth embodiment.

FIG. 21 is a frequency allocation diagram of a relay device.

FIG. 22 is a configuration diagram of a ninth embodiment.

FIG. 23 is a first frequency allocation diagram.

FIG. 24 is a second frequency allocation diagram.

FIG. 25 is a block diagram of an eleventh embodiment.

FIG. 26 is a configuration diagram of a receiving device according to a twelfth embodiment.

FIG. 27 is an explanatory diagram of signal processing.

FIG. 28 is a configuration diagram of a receiving device according to a thirteenth embodiment.

FIG. 29 is a configuration diagram of a receiving device according to a fourteenth embodiment.

FIG. 30 is an internal configuration diagram of an analysis unit.

FIG. 31 is a diagram showing vector synthesis.

FIG. 32 is a configuration diagram of a receiving device according to a fifteenth embodiment.

FIG. 33 is a block diagram of an analyzing unit of the receiving device of the seventeenth embodiment.

FIG. 34 is a block diagram of an eighteenth embodiment.

FIG. 35 is a configuration diagram of a receiving device according to a nineteenth embodiment.

FIG. 36 is a block diagram of a transmitter of the twentieth embodiment.

[Explanation of symbols]

 1 transmitting means 2 relaying means 3 receiving means

Claims (20)

[Claims] 1. A multi-propagation characteristic measuring apparatus for measuring a propagation characteristic of a propagation path which causes multipath fading in mobile communication, comprising: a transmission means for transmitting a transmission signal composed of discrete frequency spectrum components to the propagation path; A relay unit that is movable in position, receives a transmission signal from the transmission unit through the propagation path, and shifts the frequency so that the reception signal does not overlap with the reception signal on the frequency axis and transmits the signal, and a transmission from the relay unit. A multi-propagation characteristic measuring apparatus comprising: a receiving unit that receives a signal, converts the time axis into a frequency axis, and analyzes the multi-propagation characteristic. 2. The relay means uses the same band as the frequency band of the reception signal of the relay means for the frequency-shifted signal so that each spectrum component does not overlap with each spectrum component of the reception signal. The multi-propagation characteristic measuring device according to claim 1, wherein the frequency is shifted to the frequency. 3. The multiplex propagation characteristic measuring apparatus according to claim 1, wherein the relaying unit includes an amplitude modulating unit that amplitude-modulates a received signal, and a suppressing unit that suppresses a carrier wave. 4. The relay means includes amplitude modulation means for amplitude-modulating a received signal, and suppression means for suppressing one of upper and lower sidebands. Multiple propagation characteristics measuring device. 5. The transmitting means includes a spread signal generating means for generating a spread signal, a modulating means for modulating a carrier wave with the spread signal, a modulated wave from the modulating means, and a non-modulated wave of a predetermined frequency. Synthesizing and transmitting to the propagation path, the relay means includes a relay-side receiving means for receiving a transmission signal from the transmitting means via the propagation path, and the modulated wave. Separation means for separating the unmodulated wave, frequency shift means for frequency-shifting the modulated wave based on the separated unmodulated wave, and sending means for sending the frequency-shifted modulated wave The multi-propagation characteristic measuring device according to claim 1, further comprising: 6. The frequency shift means frequency-shifts the modulated wave twice based on the separated non-modulated wave, and as a result, the finally frequency-shifted signal is generated by the relay means. 6. The multiplex propagation characteristic measuring device according to claim 5, wherein the same band as the frequency band of the reception signal is used, and each spectrum component does not overlap with each spectrum component of the reception signal. 7. The transmitting means comprises: a spreading signal generating means for generating a spreading signal; a modulating means for modulating a carrier wave by the spreading signal; a modulated wave from the modulating means; Combining and transmitting the modulated wave and the unmodulated wave of the second predetermined frequency to the propagation path, and the relaying means transmits the transmission signal from the transmission means through the propagation path. Based on the relay side receiving means for receiving, the separating means for separating the modulated wave and the unmodulated wave of the first and second predetermined frequencies, and the separated unmodulated wave of the first predetermined frequency. Frequency-shifting means for frequency-shifting the modulated wave, and further frequency-shifting the shifted modulated wave again based on the separated unmodulated wave of the second predetermined frequency; Shifted modulated wave Multipath propagation characteristic measuring apparatus according to claim 1, characterized in that it comprises a sending means for sending, a. 8. The relay means includes two relay side receiving means for respectively receiving transmission signals from the same transmitting means via the propagation paths, and transmission signals respectively received by the respective relay side receiving means,
Two frequency shift means for respectively performing frequency shifts so as not to overlap with each other and the transmission signal in the frequency spectrum, and relay side transmission means for transmitting the two signals from each of the frequency shift means from one antenna. The receiving means includes two receiving side receiving means that respectively receive two signals transmitted from the relay side transmitting means and frequency shift the received signals so that they do not overlap in a frequency spectrum. Each signal frequency-shifted by each receiving side receiving means,
The multiplex propagation characteristic measuring device according to claim 1, further comprising: an analyzing unit that converts the time axis to the frequency axis and synthesizes them, and analyzes the multiplex propagation characteristic. 9. The multiple propagation characteristic measuring apparatus according to claim 1, wherein the transmitting means includes an omnidirectional antenna, and the relay apparatus includes a transmitting directional antenna directed to the receiving apparatus. 10. The first connecting means for directly connecting the transmitting means and the relay means without passing through the propagation path, and the relay means and the receiving means directly without passing through the propagation path. Second connection means for connection, and a transmission signal provided from the relay means provided in the reception means and when the first and second connection means are operated, are converted from a time axis to a frequency axis. Storage means for storing and transmission signals from the relay means provided in the receiving means when the first and second connecting means are not operated, converted from a time axis to a frequency axis, and then stored The multi-propagation characteristic measuring device according to claim 1, further comprising: an analyzing unit that analyzes the multi-propagation characteristic by comparing with data stored in the unit. 11. The receiving means receives a transmission signal from a plurality of local oscillation signals that output local oscillation signals having mutually different frequencies, and receives the transmission signal from the relay means, and outputs the same transmission signal from the local oscillation means. A frequency shift means for frequency-shifting over a plurality of times based on a plurality of local oscillation signals of the frequency shift means, for the plurality of frequency-shifted signals, a frequency conversion means for converting from a time axis to a frequency axis, The multi-propagation characteristic measuring device according to claim 1, further comprising: an analysis unit configured to analyze a multi-propagation characteristic with respect to the plurality of signals converted by the frequency conversion unit. 12. The receiving means includes a receiving side receiving means for receiving a transmission signal from the relay means, a frequency converting means for converting the received signal from a time axis to a frequency axis, and Averaging means for averaging the signals converted to the frequency axis for each predetermined frequency for each frequency, and analyzing means for analyzing the multipath propagation characteristics with respect to the averaged signals, The multi-propagation characteristic measuring device according to claim 1. 13. The receiving means includes a receiving side receiving means for receiving a transmission signal sent from the relay means, a converting means for converting the received signal into a spectrum on a frequency axis, and the converting means. Correction means for correcting the spectrum corresponding to the processing time required by the conversion means, and vector combination by calculating the power value and phase of each spectrum constituent component based on the spectrum corrected by the correction means The multi-propagation characteristic measuring device according to claim 1, further comprising: a vector synthesizing unit; and an analyzing unit configured to analyze the multi-propagation characteristic based on a combined vector that is combined a plurality of times by the vector synthesizing unit. 14. The receiving means stores in advance a storage means for storing in advance a power value and a phase correction value on the frequency axis of a transmission wave from the relay means, and sends the relay wave from the relay means via the carrier path. A receiving side receiving means for receiving the transmitted signal, a converting means for converting the received signal received by the receiving side receiving means into a spectrum on a frequency axis, and the converted spectrum stored in the storage means. Correcting with the power value and the correction value of the phase, an analyzing means for analyzing the multiple propagation characteristics based on the corrected spectrum,
The multiplex propagation characteristic measuring device according to claim 1, further comprising: 15. The receiving means includes a receiving side receiving means for receiving a transmission signal sent from the relaying means, and a converting means for converting the receiving signal received by the receiving side receiving means into a spectrum on a frequency axis. And a means for analyzing a self-frequency correlation, a transfer function, or an amplitude notch distribution in a transmission band of the received signal based on the converted spectrum. apparatus. 16. The receiving means includes a receiving side receiving means for receiving a transmitting signal sent from the relaying means, and a converting means for converting the receiving signal received by the receiving side receiving means into a spectrum on a frequency axis. 2. The multiplex propagation characteristic measuring apparatus according to claim 1, further comprising: an analyzing unit that analyzes a signal power to noise power ratio C / N of a received signal based on the converted spectrum. 17. The receiving means includes a receiving side receiving means for receiving a transmission signal sent from the relay means, a frame timing detecting means for detecting a frame timing of the received reception signal, and the detected means. The multiplex propagation characteristic measuring device according to claim 1, further comprising: an analyzing unit that analyzes an absolute delay time from the transmitting unit through the relaying unit based on a frame timing. 18. The receiving means comprises a plurality of receiving side receiving means each provided with an antenna, and a local oscillating means outputting a plurality of local oscillating signals of different frequencies corresponding to the plurality of receiving side receiving means. A plurality of frequency shift means for frequency-shifting each received signal received by the plurality of receiving-side receiving means based on a local oscillation signal from a corresponding local oscillation means, and the plurality of frequency-shifted signals are combined. The above further includes a frequency conversion unit that performs conversion from the time axis to the frequency axis, and an analysis unit that analyzes multiple propagation characteristics of the signal converted by the frequency conversion unit. 1. The multiplex propagation characteristic measuring device according to 1. 19. The transmitting means includes: a spread signal generating means for generating a spread signal; a modulating means for modulating a carrier wave by the spread signal; and a plurality of local oscillating means for outputting a plurality of local oscillating signals of different frequencies. A plurality of frequency shift means for respectively frequency-modulating the modulated wave from the modulating means based on the local oscillation signals sent from the plurality of local oscillating means, and a plurality of transmitting means corresponding to the plurality of frequency shifting means. The multi-propagation characteristic measuring apparatus according to claim 1, further comprising: an antenna. 20. A multiplex propagation characteristic measuring apparatus for measuring a propagation characteristic of a propagation path which causes multipath fading in mobile communication, wherein a first transmission signal composed of discrete frequency spectrum components is transmitted to the propagation path. 1 transmitting means, 2nd transmitting means for transmitting a 2nd transmitting signal consisting of a discrete frequency spectrum component and having a carrier frequency different from that of said 1st transmitting signal to said propagation path, and position moveable Relay means, relay side receiving means provided in the relay means and receiving each transmission signal from the first and second transmitting means via the propagation path, and provided in the relay means, the relay side Branching means for branching the received signal received by the receiving means into first and second signals, and the relay means, which is provided in the relay means, and connects the first and second signals to each other and Two frequency shifting means for respectively frequency-shifting and transmitting the received signal received by the relay side receiving means so that they do not overlap on the frequency axis, and a transmission signal from the relay means is received to shift from the time axis to the frequency axis. A multi-propagation characteristic measuring device comprising: a receiving unit that performs conversion and then analyzes the multi-propagation characteristic.