HPLC power line carrier transmitter baseband data generation method and device

Abstract

The embodiment of the present application relates to a kind of HPLC power line carrier transmitter baseband data generation method and device, the method includes the following steps: obtaining the original frequency domain signal sequence X (k) of transmitter;The intermediate signal sequence Z (k) is obtained by pre-processing the original frequency domain signal sequence X (k);The intermediate time domain sequence z (n) is obtained after IFFT transformation to the intermediate signal sequence Z (k);According to the intermediate time domain sequence z (n), the baseband output data x r (n) of the transmitter is obtained.The technical scheme provided by the embodiment of the present application is based on the particularity of HPLC standard, proposes a kind of IFFT method using half number of operation points, so as to greatly improve the speed of HPLC power line carrier transmitter baseband data generation, and reduce the demand of algorithm power.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method and apparatus for generating baseband data for an HPLC power line carrier transmitter. Background Technology

[0002] In existing technologies, for High Speed ​​Power Line Communication (HPLC) communication standards, the Orthogonal Frequency Division Multiplexing (OFDM) signal generation of the transmitter uses a 1024-point IFFT as the generation mode. While the hardware system design can be entirely based on 1024-point FFT units, the computational complexity of FFT and IFFT increases on the order of N*log₂N with the number of computation points N, leading to system processing latency. Furthermore, as the number of computation points further increases, the hardware system's storage capacity, including intermediate buffers and coefficients, also increases. Summary of the Invention

[0003] Based on the above-mentioned situation of the prior art, the purpose of this invention is to provide a method and apparatus for generating baseband data of HPLC power line carrier transmitter. Based on the special characteristics of the HPLC standard, a method for implementing IFFT using half the number of computation points is proposed, thereby greatly improving the speed of generating baseband data of HPLC power line carrier transmitter and reducing the computing power requirement.

[0004] To achieve the above objectives, according to one aspect of the present invention, a method for generating baseband data from an HPLC power line carrier transmitter is provided, comprising the steps of:

[0005] Obtain the original frequency domain signal sequence X(k) from the transmitter;

[0006] The original frequency domain signal sequence X(k) is preprocessed to obtain the intermediate signal sequence Z(k);

[0007] The intermediate time-domain sequence z(n) is obtained by performing an IFFT transform on the intermediate signal sequence Z(k);

[0008] The baseband output data x of the transmitter is obtained from the intermediate time-domain sequence z(n). r (n).

[0009] Furthermore, the original frequency domain signal sequence X(k) is preprocessed using the following formula to obtain the intermediate signal sequence Z(k):

[0010] When k = 0 to N-1,

[0011]

[0012] When k = N ~ 2N-1, Z(k) = 0;

[0013] Where N represents the number of points in the original frequency domain signal sequence; X * (k) indicates that the sequence X(k) is subjected to conjugation; (Nk) N This indicates that the sequence is reordered using modulo N.

[0014] Furthermore, the intermediate time-domain sequence z(n) is obtained by performing an IFFT transform on the intermediate signal sequence Z(k) using the following formula:

[0015] FFT N {a(m)+jb(m)}=FFT N {a(m)}+j·FFT N {b(m)}=Z(k)

[0016] Where a(m) represents the real part of the intermediate time-domain sequence z(n), and b(m) represents the imaginary part of the intermediate time-domain sequence z(n).

[0017] Furthermore, the baseband output data x of the transmitter is obtained based on the intermediate time-domain sequence z(n). r (n), including:

[0018] The baseband output data x of the transmitter is obtained by parity merging of the intermediate time-domain sequence z(n) according to the following formula. r (n):

[0019] z r (n)=x r (2n), n = [0, 2, ..., N-1]

[0020] z i (n)=x r (2n+1), n=[0,2,...N-1]

[0021] Among them, z r z(n) represents taking the real part of z(n), z i z(n) represents taking the imaginary part of z(n).

[0022] According to a second aspect of the present invention, an HPLC power line carrier transmitter baseband data generation apparatus is provided, comprising:

[0023] The original frequency domain signal sequence acquisition module is used to acquire the original frequency domain signal sequence X(k) of the transmitter;

[0024] The intermediate signal sequence calculation module is used to preprocess the original frequency domain signal sequence X(k) to obtain the intermediate signal sequence Z(k);

[0025] The intermediate time-domain sequence calculation module is used to perform IFFT transformation on the intermediate signal sequence Z(k) to obtain the intermediate time-domain sequence z(n);

[0026] The baseband output data calculation module is used to obtain the baseband output data x of the transmitter based on the intermediate time-domain sequence z(n). r (n).

[0027] Furthermore, the intermediate signal sequence calculation module preprocesses the original frequency domain signal sequence X(k) to obtain the intermediate signal sequence Z(k), including preprocessing the original frequency domain signal sequence X(k) to obtain the intermediate signal sequence Z(k) using the following formula:

[0028] When k = 0 to N-1,

[0029]

[0030] When k = N ~ 2N-1, Z(k) = 0;

[0031] Where N represents the number of points in the original frequency domain signal sequence; X * (k) indicates that the sequence X(k) is subjected to conjugation; (Nk) N This indicates that the sequence is reordered using modulo N.

[0032] Furthermore, the intermediate time-domain sequence calculation module performs an IFFT transform on the intermediate signal sequence Z(k) to obtain the intermediate time-domain sequence z(n), including performing an IFFT transform on the intermediate signal sequence Z(k) using the following formula to obtain the intermediate time-domain sequence z(n):

[0033] FFT N {a(m)+jb(m)}=FFT N {a(m)}+j·FFT N {b(m)}=Z(k)

[0034] Where a(m) represents the real part of the intermediate time-domain sequence z(n), and b(m) represents the imaginary part of the intermediate time-domain sequence z(n).

[0035] Furthermore, the baseband output data calculation module obtains the baseband output data x of the transmitter based on the intermediate time-domain sequence z(n). r (n), including:

[0036] According to the following formula, the intermediate time-domain sequence z(n) is merged by parity to obtain the baseband output data x of the transmitter r (n):

[0037] z r (n) = x r (2n), n = [0, 2,..., N - 1]

[0038] z i (n) = x r (2n + 1), n = [0, 2,..., N - 1]

[0039] where, z r (n) represents taking the real part of z(n), and z i (n) represents taking the imaginary part of z(n).

[0040] According to the third aspect of the present invention, an electronic device is provided, including a memory, a processor, and executable instructions stored on the memory and executable on the processor. When the processor executes the program, the method described in the first aspect of the present invention is implemented.

[0041] A computer-readable storage medium stores computer-executable instructions. When the executable instructions are executed by a processor, the method described in the first aspect of the present invention is implemented.

[0042] In summary, the embodiments of the present invention provide a method and device for generating baseband data of an HPLC power line carrier transmitter. The method includes the steps of: obtaining the original frequency-domain signal sequence X(k) of the transmitter; preprocessing the original frequency-domain signal sequence X(k) to obtain an intermediate signal sequence Z(k); performing an IFFT transform on the intermediate signal sequence Z(k) to obtain an intermediate time-domain sequence z(n); and obtaining the baseband output data x r (n) of the transmitter. The technical solution provided by the embodiments of the present invention proposes a method for implementing IFFT using half the number of arithmetic points based on the particularity of the HPLC standard, thereby greatly improving the speed of generating baseband data of the HPLC power line carrier transmitter and reducing the computing power requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flowchart of the method for generating baseband data of an HPLC power line carrier transmitter provided by an embodiment of the present invention;

[0044] Figure 2 is a block diagram of the composition of the device for generating baseband data of an HPLC power line carrier transmitter provided by an embodiment of the present invention;

[0045] Figure 3This is a schematic diagram of the hardware implementation structure of the HPLC power line carrier transmitter baseband data generation device provided in an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0048] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of the present invention should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in one or more embodiments of the present invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0049] The technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Based on the specific characteristics of the HPLC standard, the embodiments of the present invention propose a method and apparatus for implementing a 1024-point IFFT using, for example, a 512-point IFFT, and the hardware structure for its implementation. For the original frequency domain signal sequence X(k) of the transmitter, assuming N = 512, according to the standard description, its frequency domain signal is zero in the 512th to 1013th subcarrier data, that is:

[0050] X(k) = 0, N ≤ k ≤ 2N-1

[0051] X(k) is a 1024-point frequency domain sequence, where X(k) = 0 when k = 512 to 1023. Assume x(n) is a 1024-point IFFT sequence of X(k). Then,

[0052]

[0053] x r (n) = Real(x(n))

[0054] Among them, Real(x(n)) represents taking the real part of x(n), and the output of the final HPLC communication system can be obtained as x r (n).

[0055] It can be obtained through proof that assuming Z(k) satisfies the following formula:

[0056]

[0057] Among them, k = 0 to N - 1.

[0058] The time-domain sequence z(n) obtained by performing a 512-point IFFT on Z(k) is defined as:

[0059] z r (n) = Real(z(n))

[0060] z i (n) = Imag(z(n))

[0061] Among them, Real() represents taking the real part, and Imag() represents taking the imaginary part.

[0062] z(n) satisfies the following characteristics:

[0063] z r (n) = x r (2n), n = [0, 2,..., N - 1]

[0064] z i (n) = x r (2n + 1), n = [0, 2,..., N - 1]

[0065] According to the above principle, the method for generating baseband data of the HPLC power line carrier transmitter provided by the embodiment of the present invention is as shown in the flowchart shown in Figure 1 and includes the following steps:

[0066] S202. Obtain the original frequency-domain signal sequence X(k) of the transmitter.

[0067] S204. Preprocess the original frequency-domain signal sequence X(k) to obtain an intermediate signal sequence Z(k). The original frequency-domain signal sequence X(k) is preprocessed to obtain an intermediate signal sequence Z(k) by using the following formula:

[0068] When k = 0 to N - 1,

[0069]

[0070] When k = N to 2N - 1, Z(k) = 0;

[0071] Where, N represents the number of points of the original frequency-domain signal sequence; j represents the imaginary part symbol; X * (k) represents performing a conjugate operation on the sequence X(k); that is: X * (k) = real(X(k)) - j * imag(X(k)); (N - k) N represents performing sequence reordering on the sequence, and the reordering method is modulo N processing. For example, when k = 0, (N - k) N =(N) N = 0, when k = 1, (N - k) N =(N - 1) N = N - 1; represents the complex exponential function. According to Euler's formula,

[0072]

[0073] S206. After performing IFFT transformation on the intermediate signal sequence Z(k), an intermediate time-domain sequence z(n) is obtained. The following formula is used to perform IFFT transformation on the intermediate signal sequence Z(k) to obtain the intermediate time-domain sequence z(n):

[0074] FFT N {a(m) + jb(m)} = FFT N {a(m)} + j·FFT N {b(m)} = Z(k)

[0075] Where, a(m) represents the real part sequence of the intermediate time-domain sequence z(n), and b(m) represents the imaginary part sequence of the intermediate time-domain sequence z(n).

[0076] S208. Based on the intermediate time-domain sequence z(n), the baseband output data x r (n) of the transmitter is obtained. Obtaining the baseband output data x r (n) of the transmitter based on the intermediate time-domain sequence z(n) includes:

[0077] According to the following formula, the intermediate time-domain sequence z(n) is subjected to odd-even merging to obtain the baseband output data x r (n) of the transmitter:

[0078] z r (n) = x r (2n), n = [0, 2,... N - 1]

[0079] z i (n) = x r (2n + 1), n = [0, 2,... N - 1]

[0080] Where, z rz(n) represents taking the real part of z(n), z i z(n) represents taking the imaginary part of z(n).

[0081] The principle of the data generation method provided in this embodiment of the invention is explained below. Assume the original frequency domain signal sequence X(k) of the transmitter is a 1024-point frequency domain sequence, where X(k) = 0 when k = 512 to 1023. Assume x(n) is a 1024-point IFFT sequence of X(k).

[0082] Using complex IFFT with N=512 points N The algorithm computes the sequence of the real parts of x(n): Real{x(n)}.

[0083]

[0084] Where n = 0, ..., 1023

[0085] According to formula (1), we can obtain:

[0086]

[0087] Where m = 0, ..., N-1

[0088] According to formula (2),

[0089]

[0090] Define E(k) = X * ((Nk) N ), k = 0, ..., N-1 (5)

[0091] Formula (4) can be written as:

[0092]

[0093] Similarly, it can be concluded that

[0094]

[0095] definition

[0096]

[0097] Where k = 0, ..., N-1

[0098] Then formula (7) can be written as:

[0099]

[0100] Let the sequences of real parts of x(2n) and x(2n+1) be a(n) and b(n), respectively, i.e.

[0101]

[0102] Assumption

[0103] FFr N {a(m)+jb(m)}=FFr N {a(m)}+j·FFT N {b(m)}=Z(k) (11)

[0104] According to formulas (2) and (6), we know that

[0105] FFT N {a(m)}=(X(k)+E(k)) / 4 (12)

[0106] According to formulas (3) and (9), we know that

[0107]

[0108] Therefore, according to formula (11), we know

[0109]

[0110]

[0111] Where k = 0, ..., N-1

[0112] After calculating Z(k) using the formula, calculate the IFFT according to formula (11). N By using {Z(k)}, we can obtain the real part sequences a(n) and b(n) of x(2n) and x(2n+1).

[0113] Embodiments of the present invention also provide an HPLC power line carrier transmitter baseband data generation device. Figure 2 The diagram shows the configuration of the device, such as... Figure 2 As shown, the device includes:

[0114] The original frequency domain signal sequence acquisition module 201 is used to acquire the original frequency domain signal sequence X(k) of the transmitter;

[0115] The intermediate signal sequence calculation module 202 is used to preprocess the original frequency domain signal sequence X(k) to obtain the intermediate signal sequence Z(k);

[0116] The intermediate time-domain sequence calculation module 203 is used to perform IFFT transformation on the intermediate signal sequence Z(k) to obtain the intermediate time-domain sequence z(n);

[0117] Baseband output data calculation module 204 is used to obtain the baseband output data x of the transmitter based on the intermediate time-domain sequence z(n).r (n).

[0118] The specific functions and operations of each module in the HPLC power line carrier transmitter baseband data generation device of this embodiment have been described in detail in the HPLC power line carrier transmitter baseband data generation method of the above embodiment, therefore, their repeated description will be omitted here.

[0119] Embodiments of the present invention also provide a hardware implementation structure for the HPLC power line carrier transmitter baseband data generation device. Figure 3 The diagram shows the hardware implementation structure. Expanding the above formula (1) yields:

[0120] Z r (k)=a(k)X r (k)+b(k)X r (Nk) N -c(k)X i (k)+d(k)X i (Nk) N

[0121] Z i (k)=a(k)X i (k)-b(k)X i (Nk) N +c(k)X r (k)+d(k)X r (Nk) N

[0122] in,

[0123]

[0124]

[0125]

[0126]

[0127] like Figure 3 As shown, based on the obtained a(k), b(k), c(k), and d(k), these four values ​​are: Figure 3 The input to the module needs to be stored locally in memory and does not require multiple calculations. The only variable among the four values ​​is k, where k∈[0,N-1].

[0128] In embodiments of the present invention, an electronic device is also provided, including a memory, a processor, and executable instructions stored in the memory and executable on the processor, wherein the processor executes the program to implement the method described in the above embodiments of the present invention. Figure 4 The diagram shown is a structural schematic of the electronic device provided in this embodiment of the present invention. Figure 4 As shown, the electronic device includes: one or more processors 401 and a memory 402; and computer-executable instructions stored in the memory 402, which, when executed by the processor 401, cause the processor 401 to perform the HPLC power line carrier transmitter baseband data generation method as described in the above embodiments. The processor 401 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. The memory 402 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 401 may execute the program instructions to implement the steps and / or other desired functions in the HPLC power line carrier transmitter baseband data generation method of the above embodiments of the present invention. In some embodiments, the electronic device may further include an input device 403 and an output device 404, these components being connected via a bus system and / or other forms of connection mechanism. Figure 4 (Not shown) Interconnected. For example, when the electronic device is a standalone device, the input device 403 can be a communication network connector for receiving acquired input signals from external mobile devices. Furthermore, the input device 403 may also include, for example, a keyboard, mouse, microphone, etc. The output device 404 can output various information to the outside, and may include, for example, a monitor, speaker, printer, and communication network and its connected remote output devices.

[0129] In embodiments of the present invention, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the steps described in the above embodiments of the present invention. The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0130] It should be understood that the processor in the embodiments of the present invention can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0131] In summary, the embodiments of the present invention relate to a method and apparatus for generating baseband data of an HPLC power line carrier transmitter. The method includes the following steps: acquiring the original frequency domain signal sequence X(k) of the transmitter; preprocessing the original frequency domain signal sequence X(k) to obtain an intermediate signal sequence Z(k); performing an IFFT transform on the intermediate signal sequence Z(k) to obtain an intermediate time domain sequence z(n); and obtaining the baseband output data x of the transmitter based on the intermediate time domain sequence z(n). r (n). The technical solution provided in this embodiment of the invention, based on the special characteristics of the HPLC standard, proposes a method for implementing IFFT using half the number of operation points, thereby greatly improving the speed of baseband data generation for HPLC power line carrier transmitters and reducing the computing power requirements.

[0132] It should be understood that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of this invention, technical features of the above embodiments or different embodiments can also be combined, steps can be implemented in any order, and many other variations exist regarding different aspects of one or more embodiments of the invention as described above, which are not provided in the details for the sake of brevity. The specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A method for generating baseband data from an HPLC power line carrier transmitter, characterized in that, Including the following steps: Obtain the original frequency domain signal sequence X(k) from the transmitter; The original frequency domain signal sequence X(k) is preprocessed to obtain the intermediate signal sequence Z(k), including: When k = 0 to N-1, When k = N ~ 2N-1, Z(k) = 0; Where N represents the number of points in the original frequency domain signal sequence; X * (k) indicates that the sequence X(k) is subjected to conjugation; (Nk) N This indicates that the sequence is reordered using modulo N. The intermediate time-domain sequence z(n) is obtained by performing an IFFT transform on the intermediate signal sequence Z(k); The baseband output data x of the transmitter is obtained from the intermediate time-domain sequence z(n). r (n): According to the following formula, the baseband output data x of the transmitter is obtained by parity merging of the intermediate time-domain sequence z(n). r (n): z r (n)=x r (2n),n=[0,2,…N-1] z i (n)=x r (2n+1),n=[0,2,…N-1] Among them, z r z(n) represents taking the real part of z(n), z i z(n) represents taking the imaginary part of z(n).

2. The method according to claim 1, characterized in that, The intermediate time-domain sequence z(n) is obtained by performing an IFFT transform on the intermediate signal sequence Z(k) using the following formula: FFT N {a(m) + jb(m)} = FFT N {a(m)} + j·FFT N {b(m)} = Z(k) where, a(m) represents the real part of the intermediate time-domain sequence z(n), and b(m) represents the imaginary part of the intermediate time-domain sequence z(n).

3. A baseband data generation device for an HPLC power line carrier transmitter, characterized in that, include: The original frequency domain signal sequence acquisition module is used to acquire the original frequency domain signal sequence X(k) of the transmitter; The intermediate signal sequence calculation module is used to preprocess the original frequency domain signal sequence X(k) to obtain the intermediate signal sequence Z(k), including using the following formula to preprocess the original frequency domain signal sequence X(k) to obtain the intermediate signal sequence Z(k): When k = 0 to N-1, When k = N ~ 2N-1, Z(k) = 0; Where N represents the number of points in the original frequency domain signal sequence; X * (k) indicates that the sequence X(k) is subjected to conjugation; (Nk) N This indicates that the sequence is reordered using modulo N. The intermediate time-domain sequence calculation module is used to perform IFFT transformation on the intermediate signal sequence Z(k) to obtain the intermediate time-domain sequence z(n); The baseband output data calculation module is used to obtain the baseband output data x of the transmitter based on the intermediate time-domain sequence z(n). r (n): According to the following formula, the baseband output data x of the transmitter is obtained by parity merging of the intermediate time-domain sequence z(n). r (n): z r (n)=x r (2n),n=[0,2,…N-1] z i (n)=x r (2n+1),n=[0,2,…N-1] Among them, z r z(n) represents taking the real part of z(n), z i z(n) represents taking the imaginary part of z(n).

4. The apparatus according to claim 3, characterized in that, The intermediate time-domain sequence calculation module performs an IFFT transform on the intermediate signal sequence Z(k) to obtain the intermediate time-domain sequence z(n), including using the following formula to perform an IFFT transform on the intermediate signal sequence Z(k) to obtain the intermediate time-domain sequence z(n): FFT N {a(m)+jb(m)}=FFT N {a(m)}+j·FFT N {b(m)}=Z(k) Where a(m) represents the real part of the intermediate time-domain sequence z(n), and b(m) represents the imaginary part of the intermediate time-domain sequence z(n).

5. An electronic device, comprising a memory, a processor, and executable instructions stored in the memory and executable on the processor, characterized in that, When the processor executes the instructions, it implements the method as described in claim 1 or 2.

6. A computer-readable storage medium having computer-executable instructions stored thereon, characterized in that, When the executable instructions are executed by the processor, they implement the method as described in claim 1 or 2.

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