JP2001127716A - Device and method for outputting delay profile, device and method for converting delay profile, and fading simulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a delay profile which is given the delay times of paths discretely according to a chip rate and to properly limit the number of paths of the delay profile. SOLUTION: A delay profile generating program 213 inputs a parameter, generates a delay profile according to the inputted parameter, and outputs it. A delay profile converting program 214 inputs the delay profile, selects n paths out of the paths of the inputted delay profile, and generates and outputs a delay profile having the (n) paths.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a delay profile output apparatus and method for outputting a delay profile corresponding to an input parameter, and to convert the input delay profile into a delay profile having n (n: natural number) paths. The present invention relates to an apparatus and method for converting a delay profile, and a fading simulator provided with such an apparatus.

[0002]

2. Description of the Related Art FIG. 1 is a diagram showing a concept of a case where a radio wave is received from a base station antenna and a radio wave arrives via reflection or diffraction in a building or the like, and an example of a (propagation) delay profile. In the delay profile shown in FIG.
The horizontal axis is the propagation delay time (hereinafter, referred to as delay time) of the radio wave arriving at the mobile station, and the vertical axis is the received power. The vertical axis can be represented by a propagation loss. Further, the received power and the propagation loss may be absolute or relative.

[0003] The radio waves of the delay profile, ..., are called elementary waves (paths). The path with the shortest delay time is the path that has arrived at the shortest distance from the base station, and the path with the longer delay time is the path that has arrived via reflection and diffraction at a distant building or mountain.

FIG. 2 is a diagram showing an example of the measurement of a delay profile when a signal travels around a fixed distance from a base station. It can be seen that the path delay time and the reception level (reception power) change every moment as the mobile station travels.

[0005] When the transmission quality in mobile communication is evaluated in a laboratory experiment or the like, a signal input from a transmitter is faded using a fading simulator and output to a receiver. At that time, fading
The simulator is, for example, an ITU (International Telecom
The fading was applied to the signal based on the delay profile input by the user according to the profile model (Vehicular B) recommended by the munication union, etc., or the signal was faded after calculating the delay profile by ray tracing. .

[0006]

One of the promising candidates for next-generation mobile communication is a broadband DS-CDMA system, and research and development for its realization are being vigorously pursued (Reference 1: KS Gilhousen, etal: "On the capacity of ac
ellular CDMA system ", IEEE Trans. Veh. Technol, VT
-40, pp.303-312 (1991), Reference 2: AJ Viterbi, A.
M. Viterbi: "Erlang capacity of a power controlled
CDMA system ", IEEE J. Sel. Areas in Commun., Vol.
11, pp.892-900 (1993), Reference 3: Ohno, Adachi: "DS
-Uplink capacity and transmission power of CDMA ”, IEICE (BI
I), J79-B-II, 1, pp. 17-25 (1996)). DS-CDMA
In the method, spread bandwidth is wide (chip rate is large)
If so, the received wave is divided into multiple propagation delay waves (paths)
Narrow band FDMA
The effect of fading, which is a problem in the TDMA system or the TDMA system, can be reduced, and high-quality communication can be realized. Therefore, in order to evaluate transmission characteristics with high accuracy, it is important to clarify the propagation characteristics of separable paths.

The propagation characteristic of a path is generally called a propagation delay characteristic or a propagation delay profile (hereinafter, referred to as a delay profile) characteristic, and its shape analysis and modeling are being actively studied (Reference 4: WC). Jakes Jr .: "Micr
owave Mobile Communications ", Chapter 1, John Wiley & S
ons Inc., New York (1972), Reference 5: H. Suzuki: "AS
tatistical Model for Urban Radio Propagation ", IEE
E Trans. Commun., COM-25, 7, pp.673-680 (1972), Reference 6: Ichitsubo, Furuno, Kawasaki: "Study of Delay Profile Model for Microcell Propagation in Urban Area", IEICE Technical Report, AP
96-72 (1996)). For example, it is known that the shape of a delay profile can be approximately approximated by an exponential function model that exponentially decays with respect to the delay time (Reference 4).

By the way, in RAKE reception, all the paths cannot be received because the number of receivers (correlators) is generally smaller than the number of paths that can be actually received. Also, the propagation delay time and the reception level of the path fluctuate as the mobile station travels. Therefore, in RAKE reception, in order to improve reception efficiency, it is common practice to search for the presence or absence of a path and select and combine paths in descending order of the reception level. Focusing on this, a “level descending path profile model” has been proposed that can easily evaluate the reception level characteristics of paths in the order of higher reception level (Reference 7: Fujii, Imai: “Path Model in Wideband DS-CDMA Mobile Communication”). Proposal ”, IEICE Technical Report, RCS97-5
(1997), Reference 8: Fujii, Imai: "Wideband DS-CDMA"
Formulation of Path Model in Mobile Communication ", IEICE Technical Report, RC
S97-236 (1998)). However, highly accurate RAKE
In order to evaluate reception, a path model that can simulate changes in the propagation delay time of the path and fluctuations in the reception level due to travel of the mobile station is indispensable.

FIG. 3 shows a chip rate B [Mchip / s].
7 shows a delay profile when the value is changed. FIG. 3 shows that the number of paths increases as the chip rate increases, and the propagation loss of each path increases. This is because the time resolution improves as the chip rate increases.

However, the delay profile model is often given by a continuous function model such as an exponential function model (Reference 4). In this case, FIG.
In order to create a discrete path model from a continuous model as shown in (a), conversion according to the time resolution (= 1 / B) is required. However, a specific method of converting a path is not always clear. On the other hand, in a model in which the delay time and the level of the path are fixed in advance, such as a model defined by the ITU, the profile is far from an individual location profile because it is one model. Furthermore, if the paths are not combined / separated according to the chip rate, the distance from the actual path model will be far away. In particular, as shown in FIG. 4 (b), when the chip rate becomes higher, it is necessary to further separate each path into paths having a plurality of delay times, but a specific separation method is not disclosed.

In the following, a path delay time is discretely given according to a chip rate, and a dynamic path model that can easily simulate a change in path delay time and a change in received power due to travel of a mobile station (Reference 9: Fujii: "Broadband DS-CD
Proposal of Dynamic Path Model for MA Mobile Communication System ", 1999 IEICE University, B-1-57).

The level fluctuation characteristics of narrow-band transmission include (a) long-range fluctuation (propagation distance fluctuation) which can be approximated by an exponential function of the distance between transmission and reception, and (b) long-range fluctuation due to the influence of features and terrain around the road. A short-term variation (shadowing) whose distribution follows a log-normal distribution at the center, and (c) an instantaneous variation whose distribution is Rayleigh-distributed around the short-term variation due to interference of multiple waves in a section of about several meters. (Reference 10: Supervised by Okumura: “Basics of Mobile Communication”, IEICE (1986)).

On the other hand, as shown in FIG. 5, the level variation characteristics of the delay profile in the wideband transmission are the same as in the case of the narrowband transmission: (a) long section delay profile variation (long section variation of path), (b) short section It can be classified into section delay profile fluctuation (short section fluctuation of path) and (c) instantaneous delay profile fluctuation (instant path fluctuation) (Reference 9, Reference 1).
1: Yoshio Hosoya supervised: "Radio Propagation Handbook", 15
Chapter, Realize (1999)). When attention is paid to the path of the delay time τ, the variation can be represented by a variation characteristic in which the instantaneous variation, the short-range variation and the long-range variation are superimposed as in the case of the narrow-band transmission. The results of modeling each variation based on the measurement results are shown below.

[0014] (Regarding the instantaneous variation of the path) When an impulse wave having an infinite band is transmitted, the reception level of each path is constant and does not vary. However, if the transmission bandwidth is finite, a plurality of paths are superimposed and received, so that the reception level fluctuates. Now, assuming that the reception level of a path having a delay time τ is R (τ) (true value), the distribution can be approximated by a Rayleigh distribution represented by the following equation from the measurement results.

[0015]

(Equation 3)

Instead of equation (1), approximation may be made, for example, with a Nakagami-Rice distribution. Also, the arrival direction of the ray can be approximated to a substantially uniform distribution in the horizontal plane from the measurement result. When a moving object having an omnidirectional antenna travels at a constant speed (maximum Doppler frequency f _D [Hz]) in such a radio wave environment, its power spectrum S (f, τ) can be expressed by the following equation. (References 4, 11).

[0017]

(Equation 4)

Here, b ₀ (τ) is the average received power (short section average value) of the path having the delay time τ.

Delay time τ (for short section fluctuation of path)
When attention is paid to the path No. 1, the short-term fluctuation of the path can be approximated by a logarithmic normal fluctuation from the measurement result (References 7, 9). now,
X (= 10 log (b)
₀ (τ))), the probability density function of X p (X, τ)
Can be expressed by the following equation.

[0020]

(Equation 5)

Here, σ [dB] is the standard deviation of the short-term variation of the path, and m (d, τ) is the long-term average value of the path. If the power spectrum of the logarithmically compressed short-term variation is S (f, τ), S (f, τ) can be approximated from a measurement result by a rectangular spectrum represented by the following equation.

[0022]

(Equation 6)

[0023] Here, f _m is the maximum frequency of the power spectrum of the short-term variation of the path. By the way, standard deviation σ
Although the value of and the maximum frequency f _m varies depending urban structure and chip rate measurements from σ is the value of 5DB～7dB, also the vehicle speed (= v [m / sec] ) at the maximum frequency f _m / v normalized Is a value of 0.007 to 0.013.

(Regarding Variation of Long Section of Path) The reception level in narrow band transmission can be represented by the sum of the reception power of each path as shown in FIG. Focusing on this, if the propagation estimation equation for narrowband transmission is true, all information necessary for estimating each path is included in it (however, the information is degenerated). ). Therefore, if the distribution equation of the received power to each path can be formulated from the propagation estimation equation for narrowband transmission, the propagation estimation equation for each path in wideband transmission can be created from the propagation estimation equation for narrowband transmission.

Now, instead of the time interval (1 / B) as the path interval, a distance interval Δd (= c / B = 0.
3 / B [km]). In this case, the propagation distance of the k-th path from the leading path is calculated by using the propagation distance d of the leading path as d + (k−1) Δd (k = 1, 2, 3,.
・) The distribution rule of the received power to each path is obtained based on the measurement result, and the result of approximating the propagation estimation formula L _p (d, k) of each path is shown in the following equation (Reference 8). However, as a narrow-band propagation estimation formula, the "Sakagami equation (Reference 12: Sakagami, Kuboi:" Estimation of propagation loss considering urban area structure "), which can handle urban structure parameters such as topography and features, IEICE II), J74-BI
I, 1, pp. 17-25 (1991)) ”(References 7, 8).

L _p (d, k) = L (d + (k−1) Δd) + R + D (5) where L (d + (k−1) Δd) = 100−7.1 logW + 0.023θ + 1.4 log _s + 6 .11log <H> - {24.37-3.7 ( H / h b0) 2} logh b + (43.42-3.1logh b) log {d + (k-1) Δd} + 20.4logf -a _{(h m) + 10log (M} )

[0027]

(Equation 7)

D = 3 a (h _m ) = 3.2 (log 11.75 h _m ) ² -4.9
7 M = [B / B _B ] ([x] is a Gaussian symbol and represents an integer not exceeding x) k: path number (1 ≦ k) d: shortest distance between base station mobile stations [km] (0. 5km ~
10 km) W: Road width [m] (5 m to 50 m) θ: Road angle [°] (0 ° to 90 °) h _s : Building height [m] along roads (5 m to 80 m) <H>: Average building Height [m] (height of the mobile station from the ground:
5m~50m) h _b: base station antenna height [m] (the height from the ground of the mobile _{station: 20m~120m, h b><H}>) h b0: base station antenna height [m] (the base station H: Height of the building near the base station [m] (height of the base station from the ground: H ≦ h _b0 ) f: Frequency [MHz] (800 MHz to 2600 MH)
z) h _m: mobile station antenna height _{[m] (1m~10m) B B} : reference chip rate [Mchip / s] (1Mch
B: chip rate [Mchip / s] (1 Mchip / s)
s to 30 Mchip / s) M: path division number (M ≧ 1) Δd: path interval [km] Therefore, based on the above dynamic path model,
An apparatus and method that can obtain a delay profile in which a path delay time is discretely given according to a chip rate are desired. Further, there is a need for an apparatus and method that can easily simulate a change in delay time of a path and a change in received power accompanying travel of a mobile station.

Further, it takes time and effort for the user to input the delay profile. On the other hand, calculating a delay profile by ray tracing requires a large amount of calculation and time. Therefore, an apparatus and a method that can obtain a delay profile in a short time by a simple operation are desired.

Further, for example, when a delay profile is input to a fading simulator, the number of paths that can be input is limited. Therefore, an apparatus and method for appropriately limiting the number of paths in a delay profile are desired.

An object of the present invention is to provide an apparatus and a method capable of obtaining a delay profile in which path delay times are discretely given according to a chip rate. Another object of the present invention is to provide an apparatus and a method capable of easily simulating a change in a delay time of a path and a change in received power due to travel of a mobile station. Another object of the present invention is to provide an apparatus and a method capable of obtaining a delay profile by a simple operation in a short time. Another object of the present invention is to provide an apparatus and a method for appropriately limiting the number of paths in a delay profile.

[0032]

According to one aspect of the present invention, there is provided a delay profile output apparatus for outputting a delay profile corresponding to an input parameter, wherein the delay profile output apparatus outputs a delay profile corresponding to an input parameter. Delay profile storage means for storing one or more delay profiles together with parameters indicating characteristics of the delay profile; parameter input means for inputting parameters; searching for the delay profile storage means; And a delay profile output unit that outputs a delay profile extracted by the delay profile search unit, the delay profile output unit outputting the delay profile extracted by the delay profile search unit.

According to a second aspect of the present invention, there is provided the delay profile output device according to the first aspect, wherein the delay profile storage means performs statistical processing on one or more measured fluctuations of the delay profile, and performs a fast processing. The delay profile of the slow variation obtained by dividing the variation into the slow variation is stored together with a parameter indicating the characteristic of the delay profile, and the delay profile output device converts the fast variation into a statistical property. Further comprising a variation superimposing means for generating and utilizing the delay profile stored in the delay profile storage means, the delay profile output means comprising a delay superimposed by the variation superimposing means. It is characterized by outputting a profile.

The invention according to claim 3 is the delay profile output device according to claim 1 or 2, wherein the parameters include a shortest distance between a base station and a mobile station, a road width, and a road angle. , Building height along the road, average building height, base station antenna height, base station antenna ground height, building height near the base station,
At least one of a frequency, a mobile station antenna height, a reference chip rate, and a chip rate is included.

According to a fourth aspect of the present invention, there is provided a delay profile output device for outputting a delay profile corresponding to an input parameter, wherein a parameter input means for inputting a parameter, and a parameter input by the parameter input means. And a delay profile output means for outputting the delay profile generated by the delay profile generation means.

According to a fifth aspect of the present invention, there is provided the delay profile output device according to the fourth aspect, wherein the delay profile generation means generates a delay profile having a slow fluctuation, and the delay profile output device outputs a fast delay profile. A fluctuation superimposing means for generating the fluctuation using a statistical property and superimposing the fluctuation profile on the slow fluctuation delay profile stored in the delay profile generating means; It is characterized by outputting a delay profile on which the fluctuation is superimposed.

The invention according to claim 6 is the delay profile output device according to claim 5, wherein the parameters are a shortest distance d between the base station and the mobile station, a road width W, a road angle θ. , Building height at the roadside h _s , average building height <H>, base station antenna height h _b , base station antenna ground height h _b0 , building height H near the base station, frequency f, mobile station antenna height h _m , reference chip rate B _B, and a chip rate B, the delay profile generating means, the propagation estimation formula L _p of each path, the path number as _{k, L p (d, k} ) = L (d + (k-1 ) Δd) + R + D, where L (d + (k−1) Δd) = 100−7.1 logW + 0.023θ + 1.4 log _s + 6.11 log <H> − ｛24.37-3.7 (H / h _b0 ) ² } logh _b + (43.42-3.1logh _b log {d + (k-1 ) Δd} + 20.4logf -a (h m) + 10log (M)

[0038]

(Equation 8)

D = 3 a (h _m ) = 3.2 (log 11.75 h _m ) ² -4.9
7 M = [B / B _B ] ([x] is a Gaussian symbol and represents an integer not exceeding x) Δd = 0.3 / B The delay profile of the slow variation is generated.

The invention according to claim 7 is the delay profile output device according to any one of claims 4 to 6, wherein the parameters include a shortest distance between a base station and a mobile station, and a road width. , Road corner, roadside building height, average building height,
At least one of a base station antenna height, a base station antenna ground height, a building height near a base station, a frequency, a mobile station antenna height, a reference chip rate, and a chip rate is included.

The invention according to claim 8 is the delay profile output device according to any one of claims 4 to 7, wherein the delay profile generation device has a discrete path delay time according to a chip rate. Generating the delay profile given to

According to a ninth aspect of the present invention, there is provided a delay profile output device for converting a delay profile corresponding to an input parameter and outputting the converted delay profile. Delay profile storage means for storing together with parameters indicating characteristics, parameter input means for inputting parameters, and searching for the delay profile storage means,
Delay profile searching means for extracting a delay profile having parameters optimal to the parameters input by the parameter input means; and n (n: natural number) paths out of the delay profile paths extracted by the delay profile searching means And a delay profile conversion means for generating a delay profile having n paths, and a delay profile output means for outputting the delay profile having n paths generated by the delay profile conversion means. It is characterized by.

According to a tenth aspect of the present invention, there is provided the delay profile output device according to the ninth aspect, wherein the delay profile storage means performs statistical processing on one or more measured delay profile fluctuations, and The delay profile of the slow variation obtained by dividing the variation into the slow variation is stored together with a parameter indicating the characteristic of the delay profile, and the delay profile output device converts the fast variation into a statistical property. Generated using
The delay profile storage unit further includes a variation superimposing unit that superimposes the slow variation delay profile stored in the delay profile storage unit. Select n (n: natural number) paths and select n
A delay profile having a number of paths is generated.

An eleventh aspect of the present invention is the delay profile output device according to the ninth or tenth aspect, wherein the parameters include a shortest distance between a base station and a mobile station.
Road width, road angle, building height near road, average building height, base station antenna height, base station antenna ground height, building height near base station, frequency, mobile station antenna height, reference chip rate, and at least chip rate It is characterized in that one is included.

According to a twelfth aspect of the present invention, there is provided a delay profile output device for converting and outputting a delay profile corresponding to an input parameter, wherein the parameter input means for inputting the parameter, and the input by the parameter input means. A delay profile generating means for generating a delay profile based on the obtained parameters, and n (n: natural number) paths are selected from the paths of the delay profile generated by the delay profile generating means, and the n paths are selected. And a delay profile output means for outputting a delay profile having n paths generated by the delay profile conversion means.

According to a thirteenth aspect of the present invention, there is provided the delay profile output device according to the twelfth aspect, wherein the delay profile generation means generates a delay profile having a slow fluctuation, and the delay profile output device generates a fast delay profile. The delay profile generating means further includes a variation superimposing means for generating a variation using a statistical property, and superimposing the variation profile on the slow variation delay profile stored in the delay profile generating means. N out of the paths of the delay profile with the variation superimposed
(N: natural number) paths are selected, and a delay profile having n paths is generated.

According to a fourteenth aspect of the present invention, in the delay profile output device according to the thirteenth aspect, the parameters include a shortest distance d between the base station and the mobile station, a road width W, and a road angle θ. , Building height at the roadside h _s , average building height <H>, base station antenna height h _b , base station antenna ground height h _b0 , building height H near the base station, frequency f, mobile station antenna height h _m , reference Chip rate B _B and chip rate B
And the delay profile generation means uses the propagation estimation formula of each path as L _p and the path number as k, where L _p (d, k) = L (d + (k−1) Δd) + R + D, where L ( d + (k-1) Δd ) = 100-7.1logW + 0.023θ + 1.4logh s + 6.11log <H> - {24.37-3.7 (H / h b0) 2} logh b + (43.42- _{3.1logh b) log {d + (} k-1) Δd} + 20.4logf -a (h m) + 10log (M)

[0048]

(Equation 9)

D = 3 a (h _m ) = 3.2 (log 11.75 h _m ) ² -4.9
7 M = [B / B _B ] ([x] is a Gaussian symbol and represents an integer not exceeding x) Δd = 0.3 / B The delay profile of the slow variation is generated.

According to a fifteenth aspect of the present invention, in the delay profile output device according to any one of the twelfth to fourteenth aspects, the parameters include a shortest distance between a base station and a mobile station, a road width. At least one of the road angle, the building height at the side of the road, the average building height, the base station antenna height, the base station antenna ground height, the building height near the base station, the frequency, the mobile station antenna height, the reference chip rate, and the chip rate. It is characterized by being included.

According to a sixteenth aspect of the present invention, in the delay profile output device according to any one of the twelfth to fifteenth aspects, the delay profile generation device has a discrete path delay time according to a chip rate. Generating the delay profile given to

The invention according to claim 17 is the delay profile output device according to any one of claims 9 to 16, wherein each path of the delay profile has a reception power value, and the delay profile conversion means Is characterized by selecting n paths having a large received power value.

The invention according to claim 18 is the delay profile output device according to any one of claims 9 to 16, wherein the path selected by the delay profile conversion means when the delay profile was generated last time is stored. The delay profile conversion means refers to the previously selected path stored in the selected path storage means, and selects at least m of the n paths to be selected.
The number of paths (m: natural number) is a path having the same delay time as the path selected last time.

According to a nineteenth aspect of the present invention, in the delay profile output device according to the eighteenth aspect, each path of the delay profile has a reception power value, and the delay profile conversion means selects the last time. M paths having a large received power value are selected from paths having the same delay time as the paths, and nm paths having a large received power value are selected from paths other than the selected m paths. It is characterized by doing.

The invention according to claim 20 is the delay profile output device according to claim 18 or 19,
It is characterized by further comprising a pass number m input means for inputting the pass number m.

According to a twenty-first aspect of the present invention, there is provided the delay profile output device according to any one of the ninth to twentieth aspects, further comprising a path number n input means for inputting the path number n. I do.

According to a twenty-second aspect of the present invention, there is provided a delay profile conversion device for converting an input delay profile into a delay profile having n (n: natural number) paths, wherein a delay profile input for inputting a delay profile is provided. Means, delay profile conversion means for selecting n paths from among the paths of the delay profile input by the delay profile input means, and generating a delay profile having n paths, and the delay profile conversion means And delay profile output means for outputting the generated delay profile having n paths.

According to a twenty-third aspect of the present invention, in the delay profile conversion device according to the twenty-second aspect, each path of the delay profile has a reception power value, and the delay profile conversion means includes: Is selected.

According to a twenty-fourth aspect of the present invention, there is provided the delay profile conversion device according to the twenty-second aspect, wherein the selected path storage means stores a path selected when the delay profile conversion means last generated the delay profile. Wherein the delay profile conversion means refers to the previously selected path stored in the selected path storage means, and at least m (m: natural number) paths among the n paths to be selected have been previously selected. A path having the same delay time as the path is characterized.

According to a twenty-fifth aspect of the present invention, in the delay profile conversion device according to the twenty-fourth aspect, each path of the delay profile has a reception power value, and the delay profile conversion means selects a path selected last time. M paths having a large received power value are selected from paths having the same delay time as the paths, and nm paths having a large received power value are selected from paths other than the selected m paths. It is characterized by doing.

The invention according to claim 26 is the delay profile conversion apparatus according to claim 24 or 25,
It is characterized by further comprising a pass number m input means for inputting the pass number m.

The invention according to claim 27 is the delay profile conversion apparatus according to any one of claims 22 to 26, further comprising a path number n input means for inputting the path number n. I do.

According to a twenty-eighth aspect of the present invention, an input signal is subjected to fading in accordance with the delay profile output device according to any one of the first to twenty-first aspects and the delay profile output by the delay profile output device. Output fading means.

According to a twenty-ninth aspect of the present invention, an input signal is subjected to fading according to the delay profile conversion device according to any one of the twenty-second to twenty-second aspects, and the delay profile output by the delay profile conversion device. Output fading means.

According to a thirty-first aspect of the present invention, a delay profile corresponding to an input parameter is extracted from one or more delay profiles stored in a delay profile storage means together with a parameter indicating its own characteristics, and A delay profile output method for outputting, wherein a step of inputting a parameter, a step of searching the delay profile storage means and extracting a delay profile having an optimal parameter for the input parameter, And outputting.

According to a thirty-first aspect of the present invention, there is provided a delay profile output method for outputting a delay profile corresponding to an input parameter, wherein the step of inputting a parameter and generating a delay profile based on the input parameter are performed. And outputting the generated delay profile.

According to a thirty-second aspect of the present invention, a delay profile corresponding to an inputted parameter is extracted from one or more delay profiles stored in a delay profile storage means together with a parameter indicating a characteristic of the self, and A delay profile output method for converting and outputting, wherein a step of inputting a parameter; a step of searching the delay profile storage means and extracting a delay profile having a parameter optimal for the input parameter; Selecting n (n: natural number) paths from the paths of the generated delay profile, generating a delay profile having n paths, and outputting the generated delay profile having n paths. And a step.

According to a thirty-third aspect of the present invention, there is provided a delay profile output method for converting and outputting a delay profile corresponding to an input parameter, comprising the steps of inputting a parameter, and outputting a delay based on the input parameter. Generating a profile, and n (n: natural number) out of the paths of the generated delay profile
And generating a delay profile having n paths, and outputting the generated delay profile having n paths.

The invention according to claim 34 is a delay profile conversion method for converting an input delay profile into a delay profile having n (n: natural number) paths, wherein a step of inputting a delay profile; Selecting n paths from among the paths of the input delay profile to generate a delay profile having n paths; and outputting a delay profile having the generated n paths. It is characterized by having.

According to a thirty-fifth aspect of the present invention, there is provided a computer-readable recording medium recording a program for causing a computer to execute the delay profile output method according to any one of the thirty to thirty-third aspects.

The invention according to claim 36 is a computer-readable recording medium in which a program for causing a computer to execute the delay profile conversion method according to claim 34 is recorded.

According to the above configuration, it is possible to obtain a delay profile in which path delay times are discretely given according to the chip rate. Further, it is possible to easily simulate a change in the delay time of the path and a change in the received power accompanying the travel of the mobile station. Also,
A delay profile can be obtained in a short time by a simple procedure. Further, the number of paths in the delay profile can be appropriately limited.

[0073]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 7 is a diagram showing an example of use of a delay profile output device according to a first embodiment of the present invention. The delay profile output device 10 according to the present embodiment outputs a delay profile corresponding to an input parameter. By inputting the output delay profile to the fading simulator 20, the fading simulator 20 fades the signal input from the transmitter 30 and outputs the signal to the receiver 40.

FIG. 8 is a diagram showing a configuration example of the delay profile output device according to the present embodiment. The delay profile output device 10 according to the present embodiment is in the form of a personal computer, and includes a memory 110, a CPU 120, an input unit 122 such as a keyboard and a mouse, a display unit 124 such as a display, and an input / output process for external input / output. An interface 126, an external storage device 128 such as a floppy disk or a hard disk, and a bus 130 are provided.

The CPU 120 is connected to other elements such as the memory 110 via the bus 130, and controls other elements.

The memory 110 has a delay profile search program 112 and a delay profile conversion program 1
14 and a fluctuation superimposition program 132 are stored. Further, a delay profile storage unit 116 and a selected path storage unit 118 are provided.

FIG. 9 is a diagram showing an example of one or more delay profiles input in advance, which are stored in the delay profile output device according to the present embodiment. One or more delay profiles input in advance are stored in the delay profile storage unit 116 together with parameters indicating characteristics of the delay profiles. By doing so, when a parameter is input, it is possible to output a (preliminarily input) delay profile having parameters optimal for the input parameter.

FIG. 9 shows that the shortest distance d between the base station and the mobile station and the average building height <H> are used as parameters.
From 0.5 [km] to 10.0 [km]
m], <H> is changed from 5 [m] to 50 [m] by 1
The delay profile measured by changing each [m] is shown. When the set of input parameters is (d = 4.27 [km], <H> = 34.3 [m]), for example, d is rounded to 4.3 [k].
m] and the input <H> is 34 [m], and may be output as a delay profile having parameters optimal for the input parameters.

In the example of FIG. 9, only two parameters, d and <H>, are used for explanation. However, other parameters such as road width, road angle, building height at the side of the road,
Base station antenna height, base station antenna ground height, building height near base station, frequency, mobile station antenna height, reference chip rate, chip rate, and the like can be considered. By increasing the number of parameters and narrowing the parameter interval at the time of measurement (0.1 [km] for d and 1 [m] for <H> in the example of FIG. 9), the parameter is originally obtained by the input parameter. The delay profile makes it possible to output an optimal delay profile.

FIG. 10 is a flowchart showing an example of a delay profile search process performed by the delay profile search program according to the present embodiment.

First, in step S 101, a parameter (a set of parameters necessary for searching a delay profile) is received from the input unit 122. For example, the parameters may be stored in the external storage device 128 in advance and sequentially read.

Next, in step S102, a delay profile stored in advance in the delay profile storage unit 116 is searched, and a delay profile having parameters close to the parameters input in step S101 is extracted from the delay profile storage unit 116.

In step S103, the extracted delay profile is output. In the present embodiment, the extracted delay profile is output and stored in the memory 110 or the external storage device 128, and is transferred to a delay profile conversion program described later. The extracted delay profile can be output to the outside (fading simulator or the like) via the interface 126, or can be output to the display means 124 for display.

In step S104, if the next set of parameters is input to output the next delay profile, the process returns to step S101; otherwise, the process ends.

As described above, a delay profile can be obtained by a simple operation of inputting a parameter and a short process of extracting a delay profile stored in advance.

The variable superimposition program 132 includes a step S
This is a program for generating a variation faster than the variation of the delay profile extracted in step 102 by using a statistical property and superimposing the variation on the extracted delay profile.

The delay profile storage section 116 statistically processes one or more measured delay profile variations, and stores a slow variation delay profile obtained by dividing the variation into a fast variation and a slow variation. And
The fluctuation superimposition program 132 generates fast fluctuations using statistical properties and superimposes the fluctuations on the slow fluctuation delay profile stored in the delay profile storage unit 116. Thereby, a delay profile including a slow variation and a fast variation can be obtained.

For slow and fast fluctuations,
For example, long section fluctuations can be made slow fluctuations to make short section fluctuations and instantaneous fluctuations fast, or long section fluctuations and short section fluctuations can be made slow fluctuations to make instant fluctuations fast. .

For example, when the delay profile of the long-term variation is stored in the delay profile storage unit 116, the short-term variation and the instantaneous variation are calculated using the statistical properties as described in the dynamic path model. , And superimpose it on the delay profile of the long interval fluctuation.
Thereby, a delay profile including all of the long section fluctuation, the short section fluctuation and the instantaneous fluctuation can be obtained. In addition, since the delay profile of the long-term variation may be measured and input to the delay profile storage unit 116, the amount of the delay profile to be measured and input may be small. That is, for example, instead of measuring and inputting an averaged delay profile (delay profile including all of long-term variation, short-term variation, and instantaneous variation) for each (movement amount) of 1 cm, an averaged delay profile for each 100 m (long-range variation) (Delay profile of fluctuation) may be measured and input.

For example, the delay profile storage unit 11
In the case where the delay profile including the long-period fluctuation and the short-period fluctuation is stored in 6, the instantaneous fluctuation is generated by using the statistical property as described in the above dynamic path model, and the long-period fluctuation and the short-period fluctuation are generated. What is necessary is just to superimpose on the delay profile including the short-term fluctuation.

The superimposition of the fluctuation by the fluctuation superimposition program 132 may or may not be performed. In this case, the variation may be superimposed on the delay profile extracted in step S102, and the delay profile in which the variation is superimposed may be output in step S103.

For example, the superimposition of fluctuation may be performed by a fading simulator after outputting a delay profile to a fading simulator having a fluctuation superimposing function.

FIG. 11 is a diagram showing an example in which a fading simulator superimposes fluctuation on the delay profile output by the delay profile output device according to the present embodiment. The delay profile output device 10 outputs a slowly varying delay profile to the fading simulator 20. Fading simulator 2
0 receives the input of the statistical property of the fast fluctuation, and the fluctuation superimposing unit 2
In step 2, a fast variation is generated by utilizing the statistical property of the fast variation and superimposed on the delay profile of the slow variation to obtain a delay profile including the slow variation and the fast variation. The statistical nature of the fast fluctuations can be input to the delay profile output device 10 so that the delay profile output device 10 outputs to the fading simulator 20.

FIG. 12 is a flowchart showing a first example of the delay profile conversion processing performed by the delay profile conversion program according to the present embodiment. FIG. 13 shows the delay profile conversion program performing the conversion according to the present embodiment. It is a figure showing an example of a delay profile.

The delay profile output device 10 according to the present embodiment takes into account, for example, the number of paths that can be input to the fading simulator, and outputs n delay profiles from the delay profile search program 112 out of the paths. (N: natural number) paths are selected, and a delay profile having n paths is generated. A program for performing such conversion processing is the delay profile conversion program 114. However, the conversion process may not be performed.

In the present embodiment, a delay profile in which each path has a received power value is the object of conversion. However, for example, a delay profile in which each path has a propagation loss value may be the object of conversion.

In step S201 of FIG. 12, first, the input unit 122 receives an input of the number of passes n. However,
The number of passes n may be set to a fixed number so that no input is received.

Next, in step S202, the delay profile output from the delay profile search program 112 is received.

In step S203, it is determined whether or not the number of paths of the input delay profile is greater than n. If the number is equal to or less than n, it is not necessary to convert the delay profile, so that the process proceeds to step S206. . If the number of paths of the input delay profile is less than n, the user may be notified as an error.

On the other hand, if the number is larger than n, in step S204, n paths having large received power values are selected. For example, the number of paths of the delay profile input for the first time shown in FIG. 13 is 6, but n = 3 and 3
If the number is selected, the path with the higher received power value,
And are selected. Similarly, for the delay profile input for the second time, paths and are selected, and for the delay profile input for the third time, paths and are selected.

From the n paths selected in this way, a delay profile having n paths is generated (step S205).

In step S206, a delay profile is output. In the present embodiment, the delay profile is output to the outside via the interface 126.
The generated delay profile may be output to the memory 110 or the external storage device 128 and stored, or may be output to the display unit 124 and displayed.

In step S207, if the next delay profile is to be input, the process returns to step S202; otherwise, the process ends.

In the present embodiment, the conversion process is performed on the delay profile output by the delay profile search program 112. However, the conversion process is performed on the delay profile input from the input unit 122. Can also.

In the conversion processing of FIG. 12, since a path having a large received power value is selected, there may be no coincidence between the path selected this time and the path selected last time. If the path selected in this way changes greatly, inconvenience may occur in reception at the receiver.

FIG. 14 is a flowchart showing a second example of the delay profile conversion processing performed by the delay profile conversion program according to the present embodiment. In the selection processing of FIG. 14, at least m paths out of the n paths selected are paths having the same delay time as the path selected last time.

In step S301, input means 122
The input of the number of paths n is received from the input unit 122 in step S302. However,
The number of paths n and / or the number of paths m may be fixed so that no input is received.

In step S303, the input of the delay profile is received, and in step S304, it is determined whether or not the number of paths of the input delay profile is greater than n. If the number is equal to or less than n, the process proceeds to step S309 because there is no need to convert the delay profile.

On the other hand, if the number is larger than n, in step S305, the selected path storage unit 118 for storing the previously selected path is referred to, and the paths having the same delay time as the previously selected path are selected. Select m paths with large received power values. Thereby, the selected n
It is guaranteed that at least m of the paths will have the same delay time as the previously selected path. Then, in step S306, the selected m
N-m having a large received power value among paths other than the number of paths
Select paths. In step S307, a delay profile having n paths is generated, and in step S3
At 08, the n paths selected this time are stored in the selected path storage unit 118.

In step S309, the delay profile is output. In step S310, when the next delay profile is to be input, the process returns to step S303. Otherwise, the process ends.

For example, consider the case where n = 3 and m = 2 in the path selection for the delay profile shown in FIG. For the delay profile input for the first time, a path with a large received power value is selected. Since the delay profile is input for the first time, there is no restriction by the path selected last time.

As for the second delay profile input, first, in step S305, two paths having the same delay time as the path selected last time and two paths having large received power values are selected. Therefore, the path and are selected. Next, step S30
In 6, the selected path and other paths, that is, paths, and mn = 1 having a large received power value are selected. Therefore, a path is selected. Therefore, in step S307, a path and a delay profile having three paths are generated.

As for the third delay profile input, first, in step S305, two paths having the same received power value are selected from paths having the same delay time as the path selected last time. Therefore, the path and are selected. Next, step S30
In 6, the selected path and other paths, that is, paths, and mn = 1 having a large received power value are selected. Therefore, a path is selected. Therefore, in step S307, a path and a delay profile having three paths are generated.

In addition to the two path selection methods described above, a method of selecting a path in consideration of a path selected two or more times before, a method of selecting a path by using a random number, and the like can be considered.

In the present embodiment, both the delay profile search processing and the delay profile conversion processing are performed, but only one of them may be performed.

In the present embodiment, the delay profile search processing and the delay profile conversion processing are realized by software (program), but may be realized by hardware.

(Second Embodiment) Hereinafter, a delay profile output device according to a second embodiment of the present invention will be described focusing on differences from the delay profile output device according to the above-described first embodiment.

FIG. 15 is a diagram showing a configuration example of the delay profile output device according to the present embodiment. The delay profile output device 10 ′ according to the present embodiment takes the form of a personal computer, and includes a memory 210, a CPU 22
0, input means 222, display means 224, interface 226, external storage device 228, and bus 230.

In the memory 210, the delay profile generation program 213, the delay profile conversion program 21
4 and a fluctuation superimposition program 232 are stored. The memory 210 is provided with the selected path storage unit 218, but is not provided with the delay profile storage unit 216.

In this embodiment, the delay profile generation program 213 generates a delay profile based on the input parameters.

FIG. 16 is a flowchart showing an example of a delay profile search process performed by the delay profile search program according to the present embodiment.

First, in step S401, an input of a parameter is received from the input means 222. For example, the parameters may be stored in the external storage device 228 in advance and sequentially read.

Next, in step S402, a delay profile is generated based on the input parameters.

In the present embodiment, the shortest distance d between the base station and the mobile station, the road width W, the road angle θ, the building height h _{s on} the road, the average building height <H>, the base station antenna height h _b , the base station antenna ground height h _b0 , the building height H near the base station, the frequency f, the mobile station antenna height h _m , the reference chip rate _BB , and the chip rate B are set as (parameters), and the propagation of each path is performed. Assuming that the estimation formula is L _p and the path number is k, L _p (d, k) = L (d + (k−1) Δd) + R + D (6) where L (d + (k−1) Δd) = 100− _{7.1logW + 0.023θ + 1.4logh s + 6.11log} <H> - {24.37-3.7 (H / h b0) 2} logh b + (43.42-3.1logh b) log {d + (k- 1) Δd} + 20.4logf -a ( h m) + 10log M)

[0126]

(Equation 10)

D = 3 a (h _m ) = 3.2 (log 11.75 h _m ) ² -4.9
7 M = [B / B _B ] ([x] is a Gaussian symbol and represents an integer not exceeding x) Δd = 0.3 / B Generates a delay profile with a slower variation (long interval variation) (the above equation) (Same as (5).) This makes it possible to generate a delay profile in which path delay times are discretely given according to the chip rate.

The generation of the delay profile may be performed based on an equation other than the above equation (6). Also, the parameters can be part of the above, or other parameters can be added. For example, in the above equation (6), it is possible to substitute an average value for some parameters and remove them from the parameters.

At step S403, the generated delay profile is output. Also in the present embodiment, the extracted delay profile is output and stored in the memory 210 or the external storage device 228, and is transferred to the delay profile conversion program 214 described later. The generated delay profile can be output to the outside (fading simulator or the like) via the interface 226, or can be output to the display unit 224 and displayed.

If the next parameter is to be input in step S404, the flow returns to step S401.
Otherwise, end.

As described above, a simple operation of inputting a parameter and a short-time processing of generating a delay profile based on the input parameter and a calculation formula (for example, the above formula (6)) are used to generate a delay profile. Obtainable. Also, in the present embodiment, since it is not necessary to store the delay profile in advance,
Requires less memory.

The variable superimposition program 232 includes a step S
This is a program for generating a fluctuation faster than the fluctuation of the delay profile generated in step 402 using statistical properties and superimposing the fluctuation on the extracted delay profile.

The delay profile generating program 213 generates a slowly varying delay profile. Then, the fluctuation superimposition program 232 generates a fast fluctuation utilizing the statistical properties, and superimposes the fluctuation on the slow fluctuation delay profile generated by the delay profile generation program 213. Thereby, a delay profile including a slow variation and a fast variation can be obtained.

For example, when the equation for generating the delay profile of the long interval fluctuation is used in step S402 as in the above equation (6), the short interval fluctuation and the instantaneous fluctuation are calculated by using the dynamic path model described above. What is necessary is just to generate | generate using a statistical property and to superimpose on the delay profile of a long-term variation. Thereby, a delay profile including all of the long section fluctuation, the short section fluctuation and the instantaneous fluctuation can be obtained.

Further, for example, in the case where an equation for generating a delay profile including a long section fluctuation and a short section fluctuation is used in step S402, the instantaneous fluctuation is calculated by using the statistical property as described in the above dynamic path model. , And superimposed on the delay profile including the long section fluctuation and the short section fluctuation.

The superimposition of the fluctuation by the fluctuation superimposition program 232 may or may not be performed. In this case, the variation may be superimposed on the delay profile generated in step S402, and the delay profile in which the variation is superimposed may be output in step S403. In the present embodiment, the delay profile of the long section fluctuation is generated by the above equation (6), and the short section fluctuation and the instantaneous fluctuation are superimposed by the fluctuation superimposition program 232.

The superimposition of fluctuation may be performed by, for example, a fading simulator after outputting a delay profile to a fading simulator having a fluctuation superimposing function.

Also in the present embodiment, the delay profile output from the delay profile generation program
Perform conversion processing. Delay profile conversion program 21
4 is the same as the conversion process by the delay profile conversion program 114 according to the first embodiment.

In this embodiment, both the delay profile generation process and the delay profile conversion process are performed, but only one of them may be performed.

Further, in the present embodiment, the delay profile generation processing and the delay profile conversion processing are realized by software (program), but may be realized by hardware.

(Others) In the above-described first and second embodiments, the delay profile output device is realized as an independent device as a personal computer. However, the delay profile output device can be incorporated into a fading simulator and formed as an integrated device. .

The delay profile search program 1
12, the delay profile search program 213 and the delay profile conversion programs 114 and 214 may be stored in a floppy disk, CD-ROM, or the like, and read and executed in a memory, a hard disk, or the like before execution. it can.

[0143]

As described above, according to the present invention, it is possible to obtain a delay profile in which path delay times are discretely given according to the chip rate. Further, it is possible to easily simulate a change in the delay time of the path and a change in the received power accompanying the travel of the mobile station. Further, a delay profile can be obtained in a short time by a simple operation. Further, the number of paths in the delay profile can be appropriately limited.

Further, in the present invention, by setting urban structures such as frequency, antenna height, terrain and terrain as parameters, a delay profile according to those parameters can be obtained. Furthermore, the device and method according to the present invention are very practical devices and methods that can easily simulate actual propagation paths.

[Brief description of the drawings]

FIG. 1 is a diagram showing a concept when a radio wave is received from a base station antenna and a radio wave arrives via reflection or diffraction in a building or the like, and an example of a (propagation) delay profile.

FIG. 2 is a diagram illustrating a measurement example of a delay profile when a signal travels around a fixed distance from a base station.

FIG. 3 is a diagram illustrating a relationship between a chip rate and a delay profile.

FIG. 4 is a diagram showing conversion of a delay profile.

FIG. 5 is a diagram showing classification of delay profile fluctuation.

FIG. 6 is a diagram illustrating a relationship between narrowband transmission and wideband transmission.

FIG. 7 is a diagram illustrating an example of use of the delay profile output device according to the first embodiment of the present invention.

FIG. 8 is a diagram illustrating a configuration example of a delay profile output device according to the first embodiment of the present invention.

FIG. 9 is a diagram illustrating an example of one or more delay profiles input in advance, which are stored in the delay profile output device according to the first embodiment of the present invention.

FIG. 10 is a flowchart illustrating an example of a delay profile search process performed by the delay profile search program according to the first embodiment of the present invention.

FIG. 11 is a diagram illustrating an example in which a fading simulator superimposes fluctuation on a delay profile output by the delay profile output device according to the first embodiment of the present invention.

FIG. 12 is a flowchart illustrating a first example of a delay profile conversion process performed by the delay profile conversion program according to the first embodiment of the present invention.

FIG. 13 is a diagram illustrating an example of a delay profile that is converted by the delay profile conversion program according to the first embodiment of the present invention.

FIG. 14 is a flowchart illustrating a second example of the delay profile conversion process performed by the delay profile conversion program according to the first embodiment of the present invention.

FIG. 15 is a diagram illustrating a configuration example of a delay profile output device according to a second embodiment of the present invention.

FIG. 16 is a flowchart illustrating an example of a delay profile generation process performed by a delay profile generation program according to the second embodiment of the present invention.

[Explanation of symbols]

 10, 10 'delay profile output device 20 fading simulator 22 fluctuation superimposing unit 30 transmitter 40 receiver 110, 210 memory 112 delay profile search program 213 delay profile generation program 114, 214 delay profile conversion program 116 delay profile storage unit 118, 218 selected path storage unit 120, 220 CPU 122, 222 input unit 124, 224 display unit 126, 226 interface 128, 228 external storage device 130, 230 bus 132, 232

Claims (36)

[Claims] 1. A delay profile output device for outputting a delay profile corresponding to an input parameter, wherein the delay profile stores one or more delay profiles input in advance together with parameters indicating characteristics of the delay profile. Profile storage means, parameter input means for inputting a parameter, delay profile search means for searching the delay profile storage means and extracting a delay profile having a parameter optimum for the parameter input by the parameter input means, A delay profile output unit that outputs a delay profile extracted by the profile search unit. 2. The delay profile output device according to claim 1, wherein the delay profile storage means statistically processes one or more measured fluctuations of the delay profile to calculate a fast fluctuation and a slow fluctuation. The delay profile of the slow variation obtained separately is stored together with a parameter indicating the characteristic of the delay profile, and the delay profile output device generates the fast variation using a statistical property, A delay superimposition unit that superimposes the slow fluctuation delay profile stored in the delay profile storage unit, wherein the delay profile output unit outputs a delay profile in which the fluctuation is superimposed by the fluctuation superimposition unit. Delay profile output device. 3. The delay profile output device according to claim 1, wherein the parameters include a shortest distance between a base station and a mobile station, a road width, a road angle, a building height along a road, A delay profile output including at least one of an average building height, a base station antenna height, a base station antenna ground height, a building height near a base station, a frequency, a mobile station antenna height, a reference chip rate, and a chip rate. apparatus. 4. A delay profile output device for outputting a delay profile corresponding to an input parameter, wherein the parameter input means inputs a parameter, and a delay profile is generated based on the parameter input by the parameter input means. A delay profile output device, comprising: a delay profile generation unit; and a delay profile output unit that outputs a delay profile generated by the delay profile generation unit. 5. The delay profile output device according to claim 4, wherein the delay profile generation means generates a delay profile having a slow variation, and wherein the delay profile output device utilizes a fast variation with a statistical property. The delay profile output means further includes a delay superimposing means for generating the delay profile and superimposing the fluctuation on the slow fluctuation delay profile stored in the delay profile generating means. Output device for outputting a delay profile. 6. The delay profile output device according to claim 5, wherein the parameters are a shortest distance d between a base station and a mobile station, a road width W, a road angle θ, and a building height h beside the road. _s, average building height <H>, base station antenna height h _b, base station antenna height h _b0, the base station near the building height H, the frequency f, the mobile station antenna height h _m, the reference chip rate B _B, and chips a rate B, the delay profile generating means, a propagation estimation formula for each path L _p, the path number as _{k, L p (d, k} ) = L (d + (k-1) Δd) + R + D , where L (d + (k-1 ) Δd) = 100-7.1logW + 0.023θ + 1.4logh s + 6.11log <H> - {24.37-3.7 (H / h b0) 2} logh b + (43. _{42-3.1logh b) log {d + (} k 1) Δd} + 20.4logf -a ( h m) + 10log (M) Equation 1] D = 3 a (h _m ) = 3.2 (log 11.75 h _m ) ² -4.9
7 M = [B / B _B ] ([x] is a Gaussian symbol and represents an integer not exceeding x). Δd = 0.3 / B. Output device. 7. The delay profile output device according to claim 4, wherein the parameters include a shortest distance between a base station and a mobile station, a road width, a road angle, and a roadside. Building height, average building height, base station antenna height,
Base station antenna ground height, building height near base station, frequency,
A delay profile output device comprising at least one of a mobile station antenna height, a reference chip rate, and a chip rate. 8. The delay profile output device according to claim 4, wherein said delay profile generation device outputs a delay profile to which a delay time of a path is discretely given according to a chip rate. A delay profile output device characterized by generating. 9. A delay profile output device for converting and outputting a delay profile corresponding to an input parameter, wherein one or more delay profiles input in advance are stored together with parameters indicating characteristics of the delay profile. Delay profile storage means, parameter input means for inputting parameters, delay profile search means for searching the delay profile storage means and extracting a delay profile having a parameter optimal for the parameter input by the parameter input means, A delay profile conversion unit that selects n (n: natural number) paths from the delay profile paths extracted by the delay profile search unit and generates a delay profile having n paths; Conversion hand Delay profile output apparatus characterized by comprising a delay profile outputting means for outputting a delay profile having n paths generated by. 10. The delay profile output device according to claim 9, wherein the delay profile storage means statistically processes one or more measured fluctuations of the delay profile to calculate a fast fluctuation and a slow fluctuation. The delay profile of the slow variation obtained separately is stored together with a parameter indicating the characteristic of the delay profile, and the delay profile output device generates the fast variation using a statistical property, The delay profile storing means further comprises a variation superimposing means for superimposing the slow variation delay profile stored in the delay profile storage means, wherein the delay profile converting means comprises n of paths of the delay profile on which the variation is superimposed by the variation superimposing means (N: natural number) paths are selected, and a delay profile having n paths is generated. A delay profile output device. 11. The delay profile output device according to claim 9, wherein the parameters include a shortest distance between a base station and a mobile station, a road width, a road angle, a building height near a road, A delay profile output including at least one of an average building height, a base station antenna height, a base station antenna ground height, a building height near a base station, a frequency, a mobile station antenna height, a reference chip rate, and a chip rate. apparatus. 12. A delay profile output device for converting and outputting a delay profile corresponding to an input parameter, comprising: a parameter input means for inputting a parameter; and a delay profile based on the parameter input by the parameter input means. A delay profile generating means for generating the delay profile, selecting n (n: natural number) paths from among the paths of the delay profile generated by the delay profile generating means, and generating a delay profile having n paths A delay profile output device, comprising: a profile conversion unit; and a delay profile output unit that outputs a delay profile having n paths generated by the delay profile conversion unit. 13. The delay profile output device according to claim 12, wherein the delay profile generation unit generates a delay profile having a slow variation, and the delay profile output device utilizes a fast variation with a statistical property. The delay profile generating means further comprises a variation superimposing means for superimposing the fluctuation on the slow variation delay profile stored in the delay profile generating means, wherein the delay profile converting means superimposes the fluctuation by the fluctuation superimposing means. A delay profile output device that selects n (n: natural number) paths from among the paths, and generates a delay profile having n paths. 14. The delay profile output device according to claim 13, wherein the parameters are a shortest distance d between a base station and a mobile station, a road width W, a road angle θ, and a building height h along a road. _s, average building height <H>, base station antenna height h _b, base station antenna height h _b0, the base station near the building height H, the frequency f, the mobile station antenna height h _m, the reference chip rate B _B, and chips a rate B, the delay profile generating means, a propagation estimation formula for each path L _p, the path number as _{k, L p (d, k} ) = L (d + (k-1) Δd) + R + D , where L (d + (k-1) Δd) = 100-7.1 log W + 0.023θ + 1.4 log _s + 6.11 log <H> − {24.37-3.7 (H / h _b0 ) ² ｝ log _b + (43. _{42-3.1logh b) log {d + (} k 1) Δd} + 20.4logf -a ( h m) + 10log (M) Equation 2] D = 3 a (h _m ) = 3.2 (log 11.75 h _m ) ² -4.9
7 M = [B / B _B ] ([x] is a Gaussian symbol and represents an integer not exceeding x). Δd = 0.3 / B. Output device. 15. The delay profile output device according to claim 12, wherein the parameters include a shortest distance between a base station and a mobile station, a road width, a road angle, and a roadside. It includes at least one of a building height, an average building height, a base station antenna height, a base station antenna ground height, a building height near a base station, a frequency, a mobile station antenna height, a reference chip rate, and a chip rate. Delay profile output device. 16. The delay profile output device according to claim 12, wherein said delay profile generation device outputs a delay profile to which a delay time of a path is discretely given according to a chip rate. A delay profile output device characterized by generating. 17. The delay profile output device according to claim 9, wherein each path of said delay profile has a reception power value, and said delay profile conversion means has a large reception power value. A delay profile output device for selecting n paths. 18. The delay profile output device according to claim 9, further comprising a selected path storage unit that stores a path selected when the delay profile conversion unit last generated a delay profile. The delay profile conversion means refers to and selects a previously selected path stored in the selected path storage means.
A delay profile output device, wherein at least m (m: natural number) paths out of the plurality of paths are paths having the same delay time as a path selected last time. 19. The delay profile output device according to claim 18, wherein each path of said delay profile has a received power value, and said delay profile conversion means outputs the same delay time as the previously selected path. A delay characterized in that m paths having a large received power value are selected from the paths having the same, and nm paths having a large received power value are selected from paths other than the selected m paths. Profile output device. 20. The delay profile output device according to claim 18, further comprising a path number m input means for inputting the path number m. 21. The delay profile output device according to claim 9, further comprising a path number n input means for inputting a path number n. 22. A delay profile conversion device for converting an input delay profile into a delay profile having n (n: natural number) paths, a delay profile input means for inputting a delay profile, and the delay profile input. Means for selecting n paths from among the paths of the delay profile input by the means and generating a delay profile having n paths; and n paths generated by the delay profile converting means. And a delay profile output means for outputting a delay profile having the following. 23. The delay profile conversion device according to claim 22, wherein each path of the delay profile has a reception power value, and the delay profile conversion means selects n paths having a large reception power value. A delay profile conversion device characterized by selecting. 24. The delay profile conversion device according to claim 22, further comprising a selected path storage unit that stores a path selected when the delay profile conversion unit last generated the delay profile, The conversion unit refers to the previously selected path stored in the selected path storage unit and selects the selected path.
A delay profile conversion device characterized in that at least m (m: natural number) paths out of the plurality of paths are paths having the same delay time as the previously selected path. 25. The delay profile conversion device according to claim 24, wherein each path of said delay profile has a received power value, and said delay profile conversion means sets the same delay time as the previously selected path. A delay characterized in that m paths having a large received power value are selected from the paths having the same, and nm paths having a large received power value are selected from paths other than the selected m paths. Profile conversion device. 26. The delay profile conversion device according to claim 24, further comprising a path number m input means for inputting the path number m. 27. The delay profile conversion device according to claim 22, further comprising a path number n input means for inputting a path number n. 28. A delay profile output device according to claim 1, further comprising: fading means for fading an input signal according to a delay profile output by the delay profile output device and outputting the resulting signal. A fading simulator. 29. A delay profile conversion apparatus according to claim 22, further comprising: a fading means for fading an input signal according to a delay profile output by the delay profile conversion apparatus and outputting the resulting signal. A fading simulator. 30. A delay profile output method for extracting a delay profile corresponding to an input parameter from one or more delay profiles stored in a delay profile storage unit together with parameters indicating its own characteristics together with parameters indicating its own characteristics, and outputting the extracted delay profile. Inputting a parameter, searching the delay profile storage means and extracting a delay profile having an optimal parameter for the input parameter, and outputting the extracted delay profile. A delay profile output method. 31. A delay profile output method for outputting a delay profile corresponding to an input parameter, comprising: inputting a parameter; generating a delay profile based on the input parameter; Outputting the delayed profile. 32. A delay profile for extracting a delay profile corresponding to an input parameter from one or more delay profiles stored in a delay profile storage means together with parameters indicating its own characteristics together with parameters indicating its own characteristics, and converting and outputting the delay profile. An output method, comprising: inputting a parameter; retrieving the delay profile storage means and retrieving a delay profile having an optimum parameter for the input parameter; (N: a natural number) from the following, generating a delay profile having n paths, and outputting the generated delay profile having n paths. Delay profile output method. 33. A delay profile output method for converting and outputting a delay profile corresponding to an input parameter, comprising: inputting a parameter; and generating a delay profile based on the input parameter. Selecting n (n: natural number) paths from the paths of the generated delay profile to generate a delay profile having n paths; and a delay profile having the generated n paths. And outputting a delay profile. 34. A delay profile conversion method for converting an input delay profile into a delay profile having n (n: natural number) paths, comprising: inputting a delay profile; Selecting n paths from the paths and generating a delay profile having n paths; and outputting the generated delay profile having n paths. Delay profile conversion method. 35. A computer-readable recording medium on which a program for causing a computer to execute the delay profile output method according to claim 30 is recorded. 36. A computer-readable recording medium recording a program for causing a computer to execute the delay profile conversion method according to claim 34.