JP6684862B2 - Signal generating device, signal generating method, and signal generating program - Google Patents

Description

  The present invention relates to an apparatus, method and program for generating a multi-carrier signal.

  In a wireless communication field such as a wireless LAN and a mobile communication system LTE, a multicarrier signal generated by an OFDM (Orthogonal Frequency-Division Multiplexing) system is used. The OFDM method is a highly efficient modulation method from the viewpoint of time frequency, but in the situation where frequency resources are exhausted as the number of wireless terminals increases, further frequency band usage efficiency is desired.

  In this regard, improvement of out-of-band characteristics of a multicarrier communication system such as an OFDM signal is desired toward the construction of a next-generation mobile communication system, and research and development of a filtered multicarrier communication system are underway (for example, Non-Patent Documents 1 to 4). These are aimed at improving the systematic out-of-band characteristics of the OFDM subcarriers, and by adding filtering to the subcarriers, ISI (intersymbol interference) and ICI (intercarrier interference) characteristics The purpose is to improve.

  For the multi-carrier signal, it is necessary to set the modulation signal to be placed on each sub-carrier and the number of sub-carriers according to the medium that transmits the radio signal. Furthermore, in the filtered multi-carrier communication system, multi-carrier signals having different combinations of modulation systems and filtering systems of modulated signals are used. Therefore, in an environment in which a multicarrier signal is evaluated, various multicarrier signal sources with different numbers of subcarriers, modulation methods, filtering methods, and the like are required.

5GNOW: Non-Orthogonal, Asynchronous Waveforms for Future Mobile Applications, IEEE Communications Magazine, Feb. 2014 M. Bellanger et al. , "FBMC physical layer: a primer", 2010 Frank Schaich et a. , "Waveform contenders for 5G-suitability for short packet and low latency transmissions", Vehicular Technology ConferenceEconeEce, 2014. Nicola Michelow et al. "Generalized Frequency Division Multiplexing for 5th Generation Cellular Networks", IEEE Transactions on Communications, Vol. 62, No. 9,2014

  In an environment for evaluating a multi-carrier signal, a signal source that generates various multi-carrier signals is required. On the other hand, it is desirable that the signal source used in the environment for evaluating the multicarrier signal has a simple configuration.

  Therefore, an object of the present invention is to enable generation of various multicarrier signals with a simple configuration.

  The variation of the multicarrier signal is caused by a combination of the number of subcarriers, the modulation method, the filtering method and the like. Therefore, the inventor has found that a system based on abstract input / output is effective in obtaining a simpler configuration method for signal processing for generating multicarrier communication.

A signal generation device according to the present invention is a signal generation device used for a multicarrier signal evaluation device,
A scenario configuration unit (11) that acquires the signal type and the number of subcarriers of the multicarrier signal, and sets a signal generation operator and an operation order for generating the multicarrier signal of the signal type;
A multicarrier signal is generated from the input signal by acquiring a number of input signals according to the number of subcarriers and performing an operation of the signal generation operator according to the sequence for generating a multicarrier signal of a signal type. An execution unit (12) for
Equipped with
The signal generation operator is a time series represented by Formula (C11), which is a state space expression in each generation process specified by a suffix k indicating the order for generating a multicarrier signal of a signal type, An operator A _k or B _k used for a state variable that is either a frequency sequence or a code sequence,
The scenario configuration unit further acquires a characteristic of external noise or transmission path distortion added to a multicarrier signal, sets a characteristic addition operator and an operation order for adding the characteristic,
The execution unit adds a characteristic to the generated multicarrier signal by performing an operation of the characteristic addition operator according to the order for adding the characteristic,
The characteristic addition operator is an operator C _k or D _k used for the state variable represented by the formula (C12),
The scenario configuration unit acquires a received multi-carrier signal, sets a signal analysis operator and an operation order for analyzing the multi-carrier signal,
It is characterized by further comprising an evaluation section (15) for analyzing the received multi-carrier signal by performing an operation of the signal analysis operator according to the order for analyzing the multi-carrier signal.
(Number C11)
X _k = A _k X _k-1 + B _k U (C11)
However, k = 1 ... N (N is a positive integer), U is an input vector in which the input signal for each subcarrier is represented by a vector, and X _k is a state vector in which the state variable x _k is represented by a vector. Is.
(Number C12)
Y = C _k X _k + D _k V (C12)
However, k = N, Y is an output vector that represents the output signal y as a vector, and V is a disturbance vector that represents the disturbance as a vector.

A signal generation method according to the present invention is a signal generation method executed by a signal generation device used in a multicarrier signal evaluation device,
A design procedure for acquiring the signal type and the number of subcarriers of the multicarrier signal, and setting a signal generation operator and an order of operations for generating the multicarrier signal of the signal type,
A multicarrier signal is generated from the input signal by acquiring a number of input signals according to the number of subcarriers and performing an operation of the signal generation operator according to the sequence for generating a multicarrier signal of a signal type. Execution procedure
Have
The signal generation operator is a time series represented by Formula (C41), which is a state space expression in each generation process specified by a suffix k indicating the order for generating a multicarrier signal of a signal type, An operator A _k or B _k used for a state variable that is either a frequency sequence or a code sequence,
The design procedure further acquires a characteristic of external noise or transmission path distortion added to the multicarrier signal, sets a characteristic addition operator and an operation order for adding the characteristic,
The execution procedure adds characteristics to the generated multi-carrier signal by performing an operation of the characteristic addition operator according to the order for adding characteristics,
The characteristic addition operator is an operator Ck or Dk used for the state variable represented by the formula (C42),
The design procedure is to obtain a received multi-carrier signal, set a signal analysis operator and an operation order for analyzing the multi-carrier signal,
It is characterized by further comprising an evaluation procedure for analyzing the received multi-carrier signal by performing the operation of the signal analysis operator according to the order for analyzing the multi-carrier signal.
(Number C41)
X _k = A _k X _k-1 + B _k U (C41)
However, k = 1 ... N (N is a positive integer), U is an input vector in which the input signal for each subcarrier is represented by a vector, and X _k is a state vector in which the state variable x _k is represented by a vector. Is.
(Number C42)
Y = C _k X _k + D _k V (C42)
However, k = N, Y is an output vector that represents the output signal y as a vector, and V is a disturbance vector that represents the disturbance as a vector.

  A signal generation program according to the present invention is a program for causing a computer to function as the signal generation device according to the present invention, and is a program for causing a computer to execute a design procedure and an execution procedure.

  According to the present invention, various multicarrier signals can be generated with a simple configuration.

It is a schematic structure figure showing an example of a signal generation device concerning an embodiment. An example of a multi-carrier signal is shown. It is explanatory drawing which shows an example of an allocation procedure. An example of an input vector is shown. An example of a state variable and an impulse response is shown.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below. These embodiments are merely examples, and the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art. In this specification and the drawings, constituent elements having the same reference numerals indicate the same elements.

  FIG. 1 shows an example of a signal generation device according to the embodiment. The signal generation device 91 includes a CPU that functions as the execution unit 12, and outputs an output signal y that is a multicarrier signal with respect to an input signal u that is a code sequence. The signal generation device 91 includes a memory 13 that stores state variables and operation matrices. The signal generation device 91 includes an input / output unit 16 and a communication IF 17 for performing remote control.

  The input / output unit 16 receives the input signal u and outputs the output signal y. The components are connected by a data connection bus and a control bus. The input / output unit 16 may have not only a function of inputting / outputting data, but also a function of matching with an interface unique to the RF modulator such as a data format, a code, and a sequence.

  The signal type of the multi-carrier signal is input to the input / output unit 16. The signal type is arbitrary, and examples thereof include UF-OFDM, CP-OFDM, FBMC, filtered OFDM, GFDM, and windowing-OFDM. The input / output unit 16 is further input with arbitrary information necessary for generating a multicarrier signal, such as the number of subcarriers, a modulation method, a filtering method, and the presence / absence of a synchronization signal.

  The CPU included in the signal generation device 91 further functions as the scenario configuration unit 11. The scenario configuration unit 11 configures a scenario for generating a multicarrier signal, and controls the execution unit 12 according to the scenario. The execution unit 12 uses the operator set by the scenario configuration unit 11 to execute arithmetic processing. The Mappaer input conversion unit 14 has a function of converting each element of the input signal u consisting of a desired code sequence into an (I, Q) signal pair corresponding to a predetermined modulation scheme.

  The input signal u has a portion (hereinafter, referred to as primary modulation) that gives amplitude / phase information for converting into amplitude / phase information of a sine wave. The primary modulation may be a digital signal 1/0, but may not be a signal having a wide angular band such as 1/0 information. Since the input signal u is not a signal having a wide angular band, the occupied band of the signal can be reduced.

  For example, in the case of using a 6-bit input signal u, a two-dimensional map is shown in which the eight numerical values generated from the first three bits are I and the eight numerical values generated from the next three bits are Q. Convert to above. In this case, there are 64 mapping points of 8 * 8. This is the functional operation of the mapper, and if this (I, Q) pair is converted by IFFT, a time series in which a large number of sine waves: subcarriers given amplitude and phase information are superimposed is created. This is the OFDM signal.

ここで、ｉ＝０，１，…，Ｎ−１はサブキャリアである。以下においては、理解が容易になるよう、サブキャリア数Ｎが４の場合について説明する。 The multi-carrier signal can be expressed by a matrix having a frequency as a dimension. Therefore, the input signal u is assigned to each subcarrier, and the input signal u and the output signal y are represented by vectors as an input vector U and an output vector Y as follows.

Here, i = 0, 1, ..., N−1 are subcarriers. In the following, for ease of understanding, a case where the number N of subcarriers is 4 will be described.

The input vector U is an arbitrary code sequence composed of 1/0. The scenario configuration unit 11 uses the input vector U corresponding to the generated multicarrier signal. FIG. 2 shows an example of a multicarrier signal. When the scenario configuration unit 11 selects the input vector U, the signal generation device 91 can generate an arbitrary multicarrier signal used in the filtered multicarrier communication method for each symbol. The generated multicarrier signal may be a preamble signal S _pab , a control signal, or a payload signal. The payload signal may include the pilot signal S _plt . The input vector U corresponding to the generated multi-carrier signal may be generated using an operator for numerical conversion.

When the operator AR is an arbitrary arithmetic process performed on the input vector U when generating a multicarrier signal, the arithmetic process can be represented as ARU. In the filtered multi-carrier signal communication system, processing is performed in the order of modulation-frequency multiplexing-filtering, so it is necessary to perform arithmetic processing a plurality of times before generating the output signal y. Therefore, the state variable x is used. The state vector X, which is a vector display of the state variable x, can be expressed by the following equation, for example.
(Equation 102)
X _k = A _k X _k-1 + B _k U (102)
A is an operator representing a calculation process to be performed on the state vector X. Operators A and B function as signal generation operators necessary for generating a multicarrier signal.

The expression (102) is a state space expression at each time point specified by the suffix k, and the state vector X ₀ of k = ₀ is a matrix of all “0” (hereinafter referred to as {0}). Arbitrary multicarrier signals can be generated by changing the operators A and B according to the signals to be generated. Using operators A and B, the state vector X _k is sequentially derived, and the output vector Y is generated at an appropriate time point k.

In the signal evaluation test environment stage of the multi-carrier communication system, it is preferable that environmental characteristics can be added to the multi-carrier signal for evaluation. Therefore, the output vector Y is expressed as follows.
(Equation 103)
Y = C _k X _k + D _k V (103)
Here, C is an operator representing the arithmetic processing to be performed on the state vector, V is a disturbance vector indicating the disturbance v of each subcarrier, and D is an operator representing the arithmetic processing to be performed on the disturbance vector. The operators C and D function as characteristic addition operators necessary for adding characteristics to the multicarrier signal. As a result, it is possible to generate a multicarrier signal to which transmission line characteristics and disturbance are added.

  When the transmission line characteristics and the disturbance are not taken into consideration, the operator C becomes a unit matrix (hereinafter referred to as {E} or E), and DV becomes {0}. By changing the operators C and D according to the signal to be generated, it is possible to generate an arbitrary multicarrier signal to be evaluated.

  Each operator is not mathematically determined, but is determined by the input / output design. The scenario configuration unit 11 changes the operator used by the execution unit 12 according to the generated multicarrier signal. For example, the scenario configuration unit 1 changes the operators A and B in the order of modulation-frequency multiplexing-filtering in order to generate a multicarrier signal.

Examples of operators that function as signal generation operators include the following.
M _M: operator that maps an input signal u to the symbol points corresponding to the modulation scheme.
M _T : An operator that performs time-axis symbol multiplexing.

  The modulation method is arbitrary and is, for example, 16QAM (Quadrature Amplitude Modulation). In the case of a modulation method in which one symbol is represented by symbol points on the I-axis and Q-axis orthogonal coordinates, the code sequence of the input signal u is u = (uI (i), uQ (i)) (i = 0. , 1, 2, ...) can be represented (i is the code sequence number). Here, assuming the result after conversion of the input signal u, the I component and the Q component are illustrated separately. Here, a procedural operation is performed for each.

The input vector U is expressed by the following equation, for example. When applied on the right side of Expression (104), it can be converted by Expression 105.

The operator M _M is represented by, for example, the following equation.

According to the procedural operation of Equation (106), b ₀ acts on u _I (0) and u _Q (0) according to the usual matrix product operation. At this time, as in Expression (107), the (u _I , u _Q ) value is assigned to the (I, Q) numerical value according to the modulation method. The allocation procedure is shown in FIG.

By deriving U _I (i) + jU _Q (i), the input signal u (i) can be mapped to symbol points for each subcarrier i. By defining b that constitutes the operator M _M for each modulation system, the value of U (i) = U _I (i) + jU _Q (i) corresponding to an arbitrary modulation system can be derived. Therefore, each input signal u included in the input vector U can be mapped by an arbitrary modulation method.

For example, when the modulation method is 16QAM, when the input vector U is represented by p _ij , b _ij becomes the table shown in FIG. The parentheses in the figure indicate the (I, Q) component. The modulation schemes of interest are BPSK, QPSK, Mary-QAM, and Offset QAM.

The operator M _T is represented by the following equation, for example.

Examples of operators that function as signal generation operators include the following.
T _iFFT : An operator that performs an inverse fast Fourier transform.
T _iDFT : An operator that performs an inverse discrete time Fourier transform.
_TFFT : An operator that performs a fast Fourier transform.
_TDFT : An operator that performs a discrete-time Fourier transform.

ただし、Ｗ＝ｅｘｐ（−ｊ２π／Ｎ）は回転因子と呼ばれる。Ｎは変換要素の総数であり、ｎ，ｋは各々、時系列、周波数列に対応する変数と解釈される。離散サンプリング時間は１で正規化している。 The discrete time inverse Fourier transform and the Fourier transform are respectively represented by the following equations.

However, W = exp (-j2π / N) is called a twiddle factor. N is the total number of conversion elements, and n and k are interpreted as variables corresponding to the time series and the frequency sequence, respectively. The discrete sampling time is normalized by 1.

The operator T _FFT is expressed by the following equation, for example. The case where N = 4 is shown. W is the twiddle factor.

The operator T _iDFT that performs the inverse discrete time Fourier transform is as follows. The case where N = 4 is shown.

The operator _{T FFT} operator _{T iDFT} performing inverse matrix _{T iFFT} ^-1, discrete-time inverse Fourier transform of _{T iFFT} is related to the inverse matrix _T ^{DFT -1} of _{T DFT,} it can be used.

Examples of operators that function as signal generation operators include the following. By using these filters, it is possible to reduce OOB (Out-of-band) and cope with a filtered method.
F _U: operator for performing a filtering process in the frequency domain for each subcarrier.
F _P : An operator that performs a filtering process on a time-series format signal of a plurality of subcarriers.
F _PR : An operator that performs a cyclic convolution filtering process.
F _PPN : An operator that performs a polyphase type filtering process on a plurality of subcarriers.
F _DET : An operator that changes the output timing for each filtering data and arranges them in the time transfer direction.
F _C : An operator that corrects the frequency characteristic of filtering.
Fβ: is a coefficient operator required for preprocessing, which is a coefficient complex multiplication that arrives at the front stage of the iFFT. The configuration is equivalent to that of Fc described above.

ここで、ｆｕは、複素数で、サブキャリアの周波数位相特性を与えてフィルタリングを行う。ｆｕフィルタの周波数応答を示す。 The operator F _U is a filtering operator in the frequency domain and is represented by the following equation, for example.

Here, fu is a complex number and is applied with the frequency phase characteristic of the subcarrier to perform filtering. 4 shows the frequency response of a fu filter.

ただし、ｍ＝０，１，２，…Ｍ−１、ｉ＝０，１，２，…Ｎ−１である。 On the other hand, if the impulse response of the filter in the time domain is g (i), when M tap filters are provided in discrete time, the output after filtering is represented in the discrete domain by the convolution sum of the following equation.

However, it is m = 0,1,2, ... M-1, i = 0,1,2, ... N-1.

For example, the output x _k (i) when M = 3 and i = 0, 1, 2 is as follows.
(Equation 115)
_xk (0) = _xk-1 (0) g (0)
_xk (1) = _xk-1 (1) g (1) + _xk-1 (1) g (0)
_xk (2) = _xk-1 (2) g (2) + _xk-1 (2) g (1) + _xk-1 (2) g (0)
FIG. 5 shows an example of the state variable x ₂ (i) and the impulse response g (i) at this time.

For example, when the tap length of the g (i) filter is 3, the operator F _P is expressed by the following equation.

F _PR is an operator performed in circular convolution filtering in the time domain, for example, as follows. g (i) is the impulse response of the filter.

ｐｐ_ｉ（Ｚ^Ｍ）は遅延演算子込みのオペレータであり、以下のように構成されている。以下の式で、Ｍ＝４かつＫ＝４で、インパルス係数ｇを有するフィルタ長がＫＭ＝１６の時のポリフェーズ構成の場合を示す。ｘ_ｋ−１に対してｚ^−Ｍは遅延オペレータであり、Ｍタイミング後のデータを利用することを示している。

The operator F _PPN has a role of a polyphase filter for time series data.

pp _i (Z ^M ) is an operator including a delay operator and is configured as follows. The following equation shows the case of the polyphase configuration when M = 4 and K = 4 and the filter length having the impulse coefficient g is KM = 16. z ^−M is a delay operator for x _k−1 and indicates that data after M timings are used.

ただし、ｑ＝１〜Ｋである。 K at K = 4 has the following relationship.

However, q = 1 to K.

ここで、ｚ^−１は遅延演算子である。この遅延単位で時系列にデータが並ぶ。 The operator F _DET is expressed by the following equation, for example.

Here, z ⁻¹ is a delay operator. Data is arranged in time series in this delay unit.

The operator Fc is an operator for frequency / amplitude / phase correction by filter processing, and is represented by the following equation, for example. fc is a complex number indicating the inverse characteristic of the filter for each subcarrier.

The operator Fβ is represented by the following equation, for example. It is used when multiplying the adjustment coefficient for each subcarrier as preprocessing. β is a complex number.

Examples of operators that function as signal generation operators include the following.
_SCP : An operator that adds a CP (Cyclic prefix) for synchronization. Do after filtering.
Swin: An operator that performs a windowing process on data.

If the number of _CPs is 2, the operator _SCP is represented by the following equation, for example.

The operator that functions as a characteristic addition operator can be exemplified as follows.
S _T : An operator that adds distortion in the transmission path.
_SCFO : An operator who adds a CFO (Carrier Frequency Offset).
S _N : An operator that adds noise.

The operator S _T is represented by the following equation, for example. st is a complex number that represents transmission path distortion. Note that S _T can be applied in time series or frequency series.

The operator _SCFO is represented by the following equation, for example. cfo is a complex number that represents the frequency shift. Note that _SCFO can be applied to both time series and frequency series.

The operator S _N is represented by the following equation, for example. This assumes a model in which the independent noise sequence v is superimposed by giving amplitude-phase characteristics with sn for each subcarrier. Note that _SN can be applied in time series or frequency series.

  By combining the operators A, B, C, and D, the signal generator 91 can flexibly change the signal type, the number of subcarriers, the modulation method, the filtering method, the presence / absence of a synchronization signal, and the like. Therefore, the signal generation device 91 can generate various multicarrier signals with a simple configuration.

(Embodiment 1)
In this embodiment, an example in which the signal generation device 91 generates a multicarrier signal will be described. The scenario configuration unit 11 sets the order of operations with the operators A and B. When generating a UF-OFDM signal as a multi-carrier signal, the scenario configuration unit 11 sets A ₁ = {0}, B ₁ = _MM , A ₂ = T _iFFT , B ₂ = {0} as operators A and B. , A ₃ = F _P and B ₃ = {0} are set. In this embodiment, the case where the modulation scheme of the operator M _M is the 16QAM modulation scheme will be described.

・ K = 0
The scenario construction unit 11 inputs the input vector U to the execution unit 12. Since the modulation method of this embodiment is a 16QAM modulation method, the scenario configuration unit 11 inputs the input vector U shown in Expression (104) to the execution unit 12.

・ K = 1
Scenario component 11 is _A 1 = _{0}, specifying the B 1 = _{M M.} Since the modulation method of this embodiment is a 16QAM modulation method, the scenario configuration unit 11 inputs an operator M _M such that there are 16 symbol points to the execution unit 12. The execution unit 12 functions as an execution unit and derives the state vector X ₁ by calculating the equation (102) using this operator.
(Equation 201)
X ₁ = M _M U (201)

・ K = 2
The scenario configuration unit 11 specifies A ₂ = T _iFFT and B ₂ = {0}. The execution unit 12 functions as an execution unit and derives the state vector X ₂ by calculating the equation (202) using this operator.
(Equation 202)
X ₂ = T _iFFT * X ₁ = T _iFFT * (M _M U) (202)

Since the operator T _iFFT is applied, the state vector X ₂ becomes a multi-carrier vector signal sequence. Here, a constant coefficient may be multiplied in the calculation of the inverse Fourier transform.

・ K = 3
The scenario configuration unit 11 specifies A ₃ = F _P and B ₃ = {0}. The execution unit 12 functions as an execution unit and derives the state vector X ₃ by calculating the equation (102) using this operator.
(Equation 203)
X ₃ = F _P * X ₂ = F _P * T _iFFT * (M _M U) (203)

Since the operator F _P is applied, the state vector X ₃ becomes a vector signal sequence that is a filtered multicarrier. At this point, one symbol of the UF-OFDM signal is completed.

・ K = 4
The scenario configuration unit 11 specifies C = {E} and D = {0}. The execution unit 12 functions as an execution unit and derives the output vector Y by calculating the equation (103) using this operator.
(Equation 204)
Y = EX ₃ (204)

There is a case where the amplitude phase distortion of the filter due to the operator F _P is corrected. In this case, the operator F _C is applied as the operator A before k = 2. In this case, the state vectors X _{2 to} X ₄ are as follows.
(Equation 205)
X ₂ = F _C * X ₁ = T _iFFT * (M _M U)
X ₃ = T _iFFT * X ₂ = T _iFFT * F _C * (M _M U)
X ₄ = F _P * X ₃ = F _P * T _iFFT * F _C * (M _M U)
Y = EX ₄

Here, in the correction of frequency characteristics, once, F _P * T _iDFT * E (E is an identity matrix) is created, and the frequency distortion value of each subcarrier is calculated by T _FFT (F _P * T _iDFT * E). Can be calculated. If the reciprocal of this value and the correction value are input to the elements of F _U shown in Expression (113), the correction processing can be closed and calculated in this system. A correction value obtained from a numerical value calculated by using the observation equation described in Embodiment 3 below in the transmission scenario may be fed back to the parameter of F _U.

For example, seeking output _{Y = E * F P * E} , based on the complex number obtained for each sub-carrier obtained in T _{FFT (Y),} and obtain a correction value, the elements of each sub-carrier of F _U To construct F _U.

In this way, the UF-OFDM signal and the CP-OFDM signal can be generated by a combination of operators according to the order set by the scenario configuration unit 11. For example, CP-OFDM, GFDM (Generalized Frequency Division Multiplexing), FBMC (Filter Bank MultiCarrier), and other methods disclosed in non-patent literature can be used to generate signals using the following operators.
For _{CP-OFDM, B 1 = M} M, A 2 = T iFFT, A 3 = Sc P, A 1 = B 2 = B 3 = use a {0}.
For _{Windowing-OFDM, B 1 = M} M, A 2 = T iFFT, A 3 = S CP, A 4 = S WIN, A 1 = B 2 = B 3 = use a {0}.
For _{GFDM, B 1 = M M,} A 2 = M T, A 3 = F PR, A 4 = T iDFT, A 5 = S CP, A 1 = B 2 = B 3 = use a {0}.
For FBMC for filtering in the frequency _{domain, B 1 = M M, A} 2 = F U, A 3 = T iFFT, A 1 = B 2 = B 3 = use a {0}.
For FBMC for filtering in the time _{domain, B 1 = M M, A} 2 = Fβ, A 3 = T iFFT, A 4 = F PPM, A 5 = F DET, A 1 = B 2 = B 3 = {0 } Is used.
As described above, the signal generation device 91 according to the embodiment can construct a multicarrier signal of each system by using a combination of operators.

(Embodiment 2)
In the present embodiment, an example will be described in which the signal generation device 91 generates a multicarrier signal whose characteristics are changed. When generating a multi-carrier signal with a changed characteristic, the scenario configuration unit 11 sets the operators A and B, and further the operators C and D and the order of calculation. The scenario configuration unit 11 sets, for example, C = S _T and D = S _N.

When the scenario configuration unit 11 sets C = S _T and D = S _N , the scenario configuration unit 11 sets the operator C = S _T , D = S _N and the disturbance vector V at k = 4 described in the first embodiment. Is input to the execution unit 12. The output vector Y is derived by calculating the equation (103) using these operators.
(Equation 301)
Y = S _T X ₃ + S _N V (301)

When CFO is added in addition to the distortion of the transmission line, the scenario configuration unit 11 uses the operator C ₁ = S _CFO , C ₂ = S _T , D = A _N and k = 4 described in the first embodiment. The disturbance vector V is input to the execution unit 12. In this case, the equation (301) is as follows.
(Equation 302)
Y = S _T S _CFO X ₃ + A _N V (302)

  In this way, by setting the operators C and D and the disturbance vector V, it is possible to generate a multi-carrier signal to which transmission line characteristics and disturbance are added.

(Embodiment 3)
In the present embodiment, the CPU included in the signal generation device 91 further functions as the evaluation unit 15. The evaluation unit 15 evaluates the multicarrier signal. When evaluating a multi-carrier signal, the scenario composing unit 11 sets an operator G, which is a signal analysis operator used for evaluating a multi-carrier signal, and an order of operations.

・ K = 0
The scenario composing unit 11 inputs the multicarrier signal as a reception vector R to the evaluation unit 15. At this time, the scenario composing unit 11 sets an operator _TFFT in order to convert the multi-carrier signal into a sequence signal in the frequency domain. The evaluation unit 15 calculates _TFFT * R.

・ K = 1
The scenario configuration unit 11 specifies the operator G as the evaluation unit 15. The evaluation unit 15 calculates G * ( _TFFT * R).

Examples of the operator G include the following.
G _CCDF : An operator who performs CCDF (Complementary Cumulative Distribution Function) processing. Thereby, the amplitude probability distribution of the received signal can be formed. CCDF is equivalent to PAPR (Peak to Average Power Ratio) evaluation.
G _CS : An operator who performs constellation processing. The constellation processing includes average, variance, and EVM (Error Vector Magnitude) for each subcarrier. It can also be applied to each constellation.

When the amplitude probability distribution (CDF: Cumulative Distribution Function) is f _CDF , CCDF is obtained by f _{CCDF =} 1-f _CDF . If the vector representation of the f _CCDF of each carrier is F _CDF , the operator G _CCDF is expressed by the following equation, for example. The fccdf operator j indicates the amplitude probability distribution up to the level j. Detecting where the reception level is at a predetermined level step and increasing the predetermined COUNT of the detected level by +1 to obtain the frequency, and accumulate from the higher level to obtain the amplitude distribution. .

f _CCDF follows: z is a time advance operator, k is the number of data, j is an amplitude level index, and Lj is an amplitude level.

The operator G _CS is represented by the following equation, for example. The subscript k assumes that the received vector arrives in time series.

In the constellation processing, when obtaining an average for each sub-carrier, the following calculation is performed, for example.

ただし、Ｉ_ｋ及びＱ_ｋは予め定めた基準値を示す。 In the constellation processing, when obtaining the EVM for each subcarrier, for example, the following calculation is performed.

However, I _k and Q _k represent predetermined reference values.

  A desired parameter can be obtained by changing the internal parameter of the operator of the state vector X based on this evaluation value. Further, it is possible to perform feedback from the evaluation result and update the operator function of the system by including the feedback value and the internal parameter of the corresponding operator in advance. As a result, the contents applied to the actual system can be updated.

Further, L is calculated when viewed with _{Y = L (M M U)} . For _example, the like _{F PP * T iDFT * F U} , if this L has a nature of Masanori, inverse matrix is be _calculated, as M M U ^{= L -1} Y, it is possible to obtain the _{M M} U. If it is not regular, a pseudo inverse matrix can be calculated and obtained.

  The above is the calculation for each symbol, but it is also applicable to a plurality of symbols. This case can be realized by increasing the state variable matrix in the column direction.

(Embodiment 4)
In this embodiment, the operation of the scenario configuration unit will be described. The scenario includes any task that the signal generator 91 can perform. The tasks are, for example, signal generation, signal analysis, feedback, and communication IF. The signal type processed in the task is, for example, OFDM, CP-OFDM, UF-OFDM, FBMC, GFDM, FilteredOFDM, or Windowing-OFDM.

  The scenario configuration unit 11 refers to a database in which information necessary for a scenario is stored, and associates this information with a sequencer. The scenario configuration unit 11 converts the linked information into a format that can be executed by the execution unit 12. The sequencer executes the instruction thus created.

  The database referred to by the scenario configuration unit 11 includes a signal type of a multi-carrier signal, a code sequence of an input signal, a synchronization code (pilot pattern, preamble), the number of subcarriers, a number of symbols, a modulation method, TTI (Time Transmission Interval), and the like. Store. The database may have a hierarchical structure in the order of procedures, signal types of multicarrier signals, attributes of multicarrier signals, code sequences, and the like.

  The scenario configuration unit 11 may control the execution unit 12 according to a command from the communication IF 17. For example, the scenario configuration unit 11 additionally updates the information stored in the database according to a command input from the communication IF 17. As described above, it is preferable that the present embodiment is configured to allow remote operation from the outside with a prescribed command language. The remote operation from the outside is, for example, scenario activation, scenario update, parameter update (code sequence).

  The scenario configuration unit 11 performs a setting procedure, a design procedure, and an execution procedure in order to execute the signal generation task. In the setting procedure of the signal generation task, the signal generation device 91 acquires information necessary for generating a multicarrier signal. Information necessary for generating a multi-carrier signal includes, for example, signal type, code sequence, synchronization code, number of subcarriers, number of symbols, modulation method for modulation, TTI (Time Transmission Interval), applied filter type, and filter correction. With or without CP, with or without CP, and the number of CPs. The method of acquiring the information is arbitrary, and may be acquired from the input unit of the signal generation device 91, may be acquired from the communication IF 17, or may be read from the database.

  In the design procedure of the signal generation task, the scenario configuration unit 11 sets the operator used for the calculation of the state vector X and the order thereof according to the input in the setting procedure. At this time, the scenario composition part 11 also sets the parameter used for an operator's calculation.

  In the execution procedure of the signal generation task, the execution permission flag is used to operate the time-varying system. As a result, it is possible to generate a desired signal type, a desired code sequence, a desired synchronization code, a desired number of subcarriers, a desired number of symbols, a desired modulation scheme, and a desired TTI multicarrier signal.

  The scenario configuration unit 11 performs a setting procedure, a design procedure, and an execution procedure in order to execute the signal analysis task.

  In the signal analysis task setting procedure, the analysis contents are set. The analysis content is, for example, CCDF processing or constellation processing. At this time, the scenario composing unit 11 reads from the memory 13 the operators and parameters used until the output vector Y is derived as the operators and parameters for receiving the multi-carrier signal.

In the design procedure of the signal analysis task, the operator and its parameters are set in the evaluation unit 15 according to the input in the setting procedure. For example, when the constellation process is set in the setting procedure, the scenario configuration unit 11 sets the operator G _CS .

When the received signal is the multicarrier signal generated by the signal generation device 91, the signal generation device 91 may read the operator and the parameter used when generating the multicarrier signal from the memory 13. For example, when the operator T _iFFT is used until the output vector Y is derived, the scenario composing unit 11 sets the operator T _FFT .

  In the execution procedure of the signal analysis task, the evaluation unit 15 uses the execution permission flag to operate the time-varying system. If you want feedback, run the signal generation task again. At this time, the scenario configuration unit 11 updates the parameters of the scenario.

  As described above, the signal generation device 91 can configure a desired signal by repeating a simple matrix structure. Furthermore, the signal generation device 91 can evaluate signals, and by performing feedback of evaluation results, it is possible to evaluate various parameters with one device. Further, the signal generation device 91 can flexibly respond to a command from a remote place.

  The present invention can be applied to the information communication industry.

11: Scenario configuration unit 12: Execution unit 13: Memory 14: Mappaer input conversion unit 15: Evaluation unit 16: Input / output unit 17: Communication IF
18: Display unit 91: Signal generation device

Claims (4)

A signal generation device used in a multi-carrier signal evaluation device,
A scenario configuration unit (11) that acquires the signal type and the number of subcarriers of the multicarrier signal, and sets a signal generation operator and an operation order for generating the multicarrier signal of the signal type;
A multicarrier signal is generated from the input signal by acquiring a number of input signals according to the number of subcarriers and performing an operation of the signal generation operator according to the sequence for generating a multicarrier signal of a signal type. An execution unit (12) for
Equipped with
The signal generation operator is a time series represented by Formula (C11), which is a state space expression in each generation process specified by a suffix k indicating the order for generating a multicarrier signal of a signal type, An operator A _k or B _k used for a state variable that is either a frequency sequence or a code sequence,
The scenario configuration unit further acquires a characteristic of external noise or transmission path distortion added to a multicarrier signal, sets a characteristic addition operator and an operation order for adding the characteristic,
The execution unit adds a characteristic to the generated multicarrier signal by performing an operation of the characteristic addition operator according to the order for adding the characteristic,
The characteristic addition operator is an operator C _k or D _k used for the state variable represented by the formula (C12),
The scenario configuration unit sets the order of the signal analysis operator and operation for analyzing the multi-carrier signal generated by the execution unit,
An evaluation unit (15) for analyzing the multi-carrier signal generated by the execution unit by performing an operation of the signal analysis operator according to the order for analyzing the multi-carrier signal ,
Let R be the vector of the multicarrier signal generated by the execution unit, G be the signal analysis operator, and _TFFT be the operator that performs the fast Fourier transform .
The evaluation unit calculates G * ( _TFFT * R), which is an evaluation value ,
The scenario configuration unit is
Updating the signal generation operator so that the evaluation value becomes a desired value, or
Updating the information of the signal generation operator corresponding to the evaluation value by feeding back the evaluation value,
A signal generation device characterized by the above.
(Number C11)
X _k = A _k X _k-1 + B _k U (C11)
However, k = 1 ... N (N is a positive integer), U is an input vector in which the input signal for each subcarrier is represented by a vector, and X _k is a state vector in which the state variable x _k is represented by a vector. Is.
(Number C12)
Y = C _k X _k + D _k V (C12)
However, k = N, Y is an output vector that represents the output signal y as a vector, and V is a disturbance vector that represents the disturbance as a vector. The signal generation device according to claim 1 , wherein the signal analysis operator is an operator that performs a CCDF (Complementary Cumulative Distribution Function) process or a constellation process. A signal generation method executed by a signal generation device used in a multicarrier signal evaluation device, comprising:
A design procedure for acquiring the signal type and the number of subcarriers of the multicarrier signal, and setting a signal generation operator and an order of operations for generating the multicarrier signal of the signal type,
A multicarrier signal is generated from the input signal by acquiring a number of input signals according to the number of subcarriers and performing an operation of the signal generation operator according to the sequence for generating a multicarrier signal of a signal type. Execution procedure
Have
The signal generation operator is a time series represented by Formula (C41), which is a state space expression in each generation process specified by a suffix k indicating the order for generating a multicarrier signal of a signal type, An operator A _k or B _k used for a state variable that is either a frequency sequence or a code sequence,
The design procedure further acquires a characteristic of external noise or transmission path distortion added to the multicarrier signal, sets a characteristic addition operator and an operation order for adding the characteristic,
The execution procedure adds characteristics to the generated multi-carrier signal by performing an operation of the characteristic addition operator according to the order for adding characteristics,
The characteristic addition operator is an operator C _k or D _k used for the state variable represented by the formula (C42),
The design procedure is to set the order of the signal analysis operator and operation for analyzing the multi-carrier signal generated by the execution procedure,
By further performing the operation of the signal analysis operator according to the order for analyzing the multi-carrier signal, further comprising an evaluation procedure for analyzing the multi-carrier signal generated in the execution procedure ,
Let R be the vector of the multicarrier signal generated in the execution procedure, G be the signal analysis operator, and _TFFT be the operator that performs the fast Fourier transform .
The evaluation procedure calculates G * ( _TFFT * R), which is an evaluation value ,
The design procedure is
Updating the signal generation operator so that the evaluation value becomes a desired value, or
Updating the information of the signal generation operator corresponding to the evaluation value by feeding back the evaluation value,
A signal generation method characterized by the above.
(Number C41)
X _k = A _k X _k-1 + B _k U (C41)
However, k = 1 ... N (N is a positive integer), U is an input vector in which the input signal for each subcarrier is represented by a vector, and X _k is a state vector in which the state variable x _k is represented by a vector. Is.
(Number C42)
Y = C _k X _k + D _k V (C42)
However, k = N, Y is an output vector that represents the output signal y as a vector, and V is a disturbance vector that represents the disturbance as a vector. The computer, the signal generation program for executing each procedure included in the signal generation method according to claim 3.

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