CN117834352A - Enhanced channel equalization method, device and storage medium - Google Patents
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Abstract
The invention discloses an enhanced channel equalization method, a device and a storage medium, wherein the method comprises the following steps: acquiring a synchronizing signal in high-speed carrier power line communication, wherein the synchronizing signal is a frame of signal subjected to synchronizing operation; determining a plurality of OFDM symbols according to the synchronous signals; calculating the useful signal average power at each subcarrier location in each OFDM symbol; obtaining the noise power of each subcarrier position according to the average power and the average power of the useful signals of each subcarrier position; calculating a channel estimation value corresponding to each diversity according to the diversity signal corresponding to each received bit information; and generating bit information after equalization and combination processing as input of a decoder according to the diversity signals, the channel estimation value and the noise power of each subcarrier position, so as to reduce the influence of signal quality degradation caused by pulse interference elimination and single-tone interference elimination and improve the receiving reliability.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an enhanced channel equalization method, apparatus, and storage medium.
Background
Power line communication (Power Line Communication, PLC) refers to a communication scheme in which data is transmitted via a power line network as a transmission medium. Communication using the power line needs to solve a series of problems, such as ultra-strong burst interference, single-tone interference, and the like, which affect the data of the carrier in the power line communication.
The prior art generally uses a zero-setting method, a clipping method, and a hybrid method of the two to perform anti-impulse interference in a power line communication system. However, the zero-setting method, the amplitude limiting method and the combined hybrid method need to reasonably determine an optimal threshold value and average power or amplitude in the process of eliminating pulse interference, the threshold value is too high, a lot of pulse interference below the threshold value cannot be inhibited, and the threshold value is too low, so that useful signals are also eliminated by mistake, and the system receiving performance is reduced sharply under the pulse interference. Especially in the case that the relative intensities of the pulse interference and the useful signal cannot be determined in time, the pulse and the signal are more easily confused. The method of zero setting, clipping and the combined method of the two cannot effectively process the impulse interference elimination in the case, and the processing effect is poor. The single-tone interference is another deterministic interference with remarkable spectrum characteristics, and a single-tone signal is seen on a spectrometer, but in an OFDM system, due to quantization and limited FFT point number, the single-tone interference can show obvious narrow-band interference properties, and subcarrier signals in a certain range centering on a single tone can be seriously affected. Pulse interference cancellation is processed in the time domain, clipping the abnormal pulses, and the useful signal is cancelled. The equivalent effect represented in the frequency domain is equivalent to random weak interference with certain intensity in the frequency domain. The single tone interference cancellation often uses a notch approach. Because the filter cannot perfectly trap the single sound, only the frequency domain of a certain area can be eliminated, and the estimation error of the single sound is added, the signal attenuation of a plurality of sub-carriers can be caused by the final single sound interference elimination result. Thus, whatever the interference, the signal after interference removal causes a certain degree of signal quality degradation.
Disclosure of Invention
The invention provides an enhanced channel equalization method, an enhanced channel equalization device and a storage medium, which are used for reducing the influence of signal quality degradation caused by impulse interference elimination and single-tone interference elimination and improving the receiving reliability.
The invention provides an enhanced channel equalization method, which comprises the following steps:
acquiring a synchronizing signal in high-speed carrier power line communication, wherein the synchronizing signal is a frame of signal subjected to synchronizing operation; determining a plurality of OFDM symbols according to the synchronous signals; calculating useful signal average power of each subcarrier position in each OFDM symbol; obtaining the noise power of each subcarrier position according to the average power and the average power of the useful signals of each subcarrier position;
calculating a channel estimation value corresponding to each diversity according to the diversity signal corresponding to each received bit information; and generating bit information after equalization and combination processing as input of a decoder according to the diversity signal, the channel estimation value and the noise power of each subcarrier position.
Further, calculating the useful signal average power of each subcarrier position in each OFDM symbol, specifically:
performing FFT (fast Fourier transform) on each OFDM symbol to obtain a corresponding frequency domain signal and a complex value of each subcarrier on the frequency domain, wherein the complex value comprises: a received value of the preamble symbol and the payload information; calculating conjugate correlation values of each frequency domain signal in turn, wherein the conjugate correlation values are obtained by carrying out conjugate cross-correlation on the frequency domain signal corresponding to the current leading symbol and the frequency domain signal corresponding to the next leading symbol;
and accumulating conjugate correlation values of all frequency domain signals, taking a real part to obtain useful signal power of each subcarrier position, and calculating an average value of the useful signal power to obtain useful signal average power of each subcarrier position.
Further, FFT is performed on each OFDM symbol to obtain a corresponding frequency domain signal and a complex value of each subcarrier in the frequency domain, which is specifically:
performing FFT (fast Fourier transform) on the L OFDM symbols to obtain L corresponding frequency domain signals;
the expression of the frequency domain signal is: p is p l (k) L=0,..l-1, L is a preamble symbol index, L is a positive integer greater than 1; k=k b ,...,k e K is the index of the useful sub-carrier, k e K is the starting position of the useful subcarrier e Is the end position of the useful subcarrier.
Further, a conjugate correlation value of each frequency domain signal is calculated in turn, wherein the conjugate correlation value is obtained by performing conjugate cross-correlation on a frequency domain signal corresponding to a current preamble symbol and a frequency domain signal corresponding to a next preamble symbol, and specifically comprises:
let l=0, for p l (k) And p l+1 (k) Performing conjugate cross-correlation on the signals to obtain conjugate correlation values of the first frequency domain signals; the expression of the conjugate correlation value of the first frequency domain signal is:
let l=l+1, calculate the conjugate correlation value of each frequency domain signal sequentially until l=l-2;
the expression of the conjugate correlation value of the frequency domain signal is:
further, according to the average power and the average power of the useful signal of each subcarrier position, the noise power of each subcarrier position is obtained, specifically:
the expression of the useful signal average power for each subcarrier location is:
the expression of the average power per subcarrier location is:
subtracting the average power of the corresponding useful signal from the average power of each subcarrier position to obtain the noise power of each subcarrier position, wherein the expression of the noise power is as follows:
NI(k)＝P(k)-P s (k)；
wherein P is s (k) P (k) and NI (k) are the useful signal average power, average power and noise power of the subcarrier locations, respectively.
Further, generating bit information after equalization and combination processing as an input of a decoder according to the diversity signal, the channel estimation value and the noise power of each subcarrier position, specifically:
performing conjugate multiplication on each diversity signal and a corresponding channel estimation value, and dividing the signal by the noise power of the corresponding diversity to obtain each weighted diversity; combining all the weighted diversity to obtain weighted balanced output;
the weighted equalization output expression is:
wherein I (n) is bit information after equalization and combination processing,l m and k m The OFDM symbol index and the subcarrier position corresponding to each diversity m are respectively provided; h (k) m ) For each diversity-corresponding channel estimate, m=1,. M, M is the diversity number;
and taking the N bits of information after the equalization and combination as the input of a decoder.
As a preferable scheme, the invention can track the noise intensity in real time by utilizing a plurality of leading or pilot frequency subcarrier signals, and has high accuracy of calculating the signal quality; the invention carries out weighting treatment on each diversity signal before diversity combination, distributes more weight to the diversity with good signal, reduces the weight to the signal with weak signal, and further improves the reliability of the soft information input to the decoder; the invention dynamically adapts to the side effect of various interference signals after elimination, reduces the influence of signal quality reduction caused by impulse interference elimination and single-tone interference elimination, and improves the receiving reliability.
Correspondingly, the invention also provides an enhanced channel equalization device, which comprises: a data processing module and a channel equalization module;
the data processing module is used for acquiring a synchronizing signal in high-speed carrier power line communication, wherein the synchronizing signal is a frame of signal subjected to synchronizing operation; determining a plurality of OFDM symbols according to the synchronous signals; calculating useful signal average power of each subcarrier position in each OFDM symbol; obtaining the noise power of each subcarrier position according to the average power and the average power of the useful signals of each subcarrier position;
the channel equalization module is used for calculating a channel estimation value corresponding to each diversity according to the diversity signal corresponding to each received bit information; and generating bit information after equalization and combination processing as input of a decoder according to the diversity signal, the channel estimation value and the noise power of each subcarrier position.
Further, the data processing module includes: an FFT conversion unit and a calculation unit;
the FFT transformation unit is configured to perform FFT transformation on each OFDM symbol, to obtain a corresponding frequency domain signal and a complex value of each subcarrier on the frequency domain, where the complex value includes: the received values of the preamble symbol and the payload information are specifically:
performing FFT (fast Fourier transform) on the L OFDM symbols to obtain L corresponding frequency domain signals;
the expression of the frequency domain signal is: p is p l (k) L=0,..l-1, L is a preamble symbol index, L is a positive integer greater than 1; k=k b ，...，k e K is the index of the useful sub-carrier, k b K is the starting position of the useful subcarrier e Is the end position of the useful subcarrier;
the calculating unit is configured to sequentially calculate a conjugate correlation value of each frequency domain signal, where the conjugate correlation value is obtained by performing conjugate cross-correlation on a frequency domain signal corresponding to a current preamble symbol and a frequency domain signal corresponding to a subsequent preamble symbol, and specifically includes:
let l=0, for p l (k) And p l+1 (k) Performing conjugate cross-correlation on the signals to obtain conjugate correlation values of the first frequency domain signals; the expression of the conjugate correlation value of the first frequency domain signal is:
let l=l+1, calculate the conjugate correlation value of each frequency domain signal sequentially until l=l-2;
the expression of the conjugate correlation value of the frequency domain signal is:
accumulating conjugate correlation values of all frequency domain signals, taking a real part to obtain useful signal power of each subcarrier position, and calculating an average value of the useful signal power to obtain useful signal average power of each subcarrier position;
the expression of the useful signal average power for each subcarrier location is:
the expression of the average power per subcarrier location is:
subtracting the average power of the corresponding useful signal from the average power of each subcarrier position to obtain the noise power of each subcarrier position, wherein the expression of the noise power is as follows:
NI(k)＝P(k)-P s (k)；
wherein P is s (k) P (k) and NI (k) are the useful signal average power, average power and noise power of the subcarrier locations, respectively.
Further, the channel equalization module includes: a diversity processing unit and an output unit;
the diversity processing unit is used for carrying out conjugate multiplication on each diversity signal and a corresponding channel estimation value and dividing the noise power of the corresponding diversity to obtain each weighted diversity; combining all the weighted diversity to obtain weighted balanced output;
the weighted equalization output expression is:
wherein I (n) is bit information after equalization and combination processing,l m and k m The OFDM symbol index and the subcarrier position corresponding to each diversity m are respectively provided; h (k) m ) For each diversity-corresponding channel estimation value, m=1, …, M being the diversity number;
the output unit is used for taking the N bits of information after the equalization and combination processing as the input of the decoder.
Accordingly, the present invention also provides a computer-readable storage medium including a stored computer program; wherein the computer program, when running, controls a device in which the computer readable storage medium is located to perform an enhanced channel equalization method according to the present disclosure.
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Fig. 1 is a schematic flow chart of an embodiment of an enhanced channel equalization method provided by the present invention;
fig. 2 is a schematic structural diagram of an embodiment of an enhanced channel equalization apparatus provided by the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, an enhanced channel equalization method provided in an embodiment of the present invention includes steps S101-S102:
step S101: acquiring a synchronizing signal in high-speed carrier power line communication, wherein the synchronizing signal is a frame of signal subjected to synchronizing operation; determining a plurality of OFDM symbols according to the synchronous signals; calculating useful signal average power of each subcarrier position in each OFDM symbol; obtaining the noise power of each subcarrier position according to the average power and the average power of the useful signals of each subcarrier position;
further, calculating the useful signal average power of each subcarrier position in each OFDM symbol, specifically:
performing FFT (fast Fourier transform) on each OFDM symbol to obtain a corresponding frequency domain signal and a complex value of each subcarrier on the frequency domain, wherein the complex value comprises: a received value of the preamble symbol and the payload information; calculating conjugate correlation values of each frequency domain signal in turn, wherein the conjugate correlation values are obtained by carrying out conjugate cross-correlation on the frequency domain signal corresponding to the current leading symbol and the frequency domain signal corresponding to the next leading symbol;
and accumulating conjugate correlation values of all frequency domain signals, taking a real part to obtain useful signal power of each subcarrier position, and calculating an average value of the useful signal power to obtain useful signal average power of each subcarrier position.
Further, FFT is performed on each OFDM symbol to obtain a corresponding frequency domain signal and a complex value of each subcarrier in the frequency domain, which is specifically:
performing FFT (fast Fourier transform) on the L OFDM symbols to obtain L corresponding frequency domain signals;
the expression of the frequency domain signal is: p is p l (k) L=0,..l-1, L is a preamble symbol index, L is a positive integer greater than 1; k=k b ，...，k e K is the index of the useful sub-carrier, k b K is the starting position of the useful subcarrier e Is the end position of the useful subcarrier.
Further, a conjugate correlation value of each frequency domain signal is calculated in turn, wherein the conjugate correlation value is obtained by performing conjugate cross-correlation on a frequency domain signal corresponding to a current preamble symbol and a frequency domain signal corresponding to a next preamble symbol, and specifically comprises:
let l=0, for p l (k) And p l+1 (k) Performing conjugate cross-correlation on the signals to obtain conjugate correlation values of the first frequency domain signals; the expression of the conjugate correlation value of the first frequency domain signal is:
let l=l+1, calculate the conjugate correlation value of each frequency domain signal sequentially until l=l-2;
the expression of the conjugate correlation value of the frequency domain signal is:
further, according to the average power and the average power of the useful signal of each subcarrier position, the noise power of each subcarrier position is obtained, specifically:
the expression of the useful signal average power for each subcarrier location is:
the expression of the average power per subcarrier location is:
subtracting the average power of the corresponding useful signal from the average power of each subcarrier position to obtain the noise power of each subcarrier position, wherein the expression of the noise power is as follows:
NI(k)＝P(k)-P s (k)；
wherein P is s (k) P (k) and NI (k) are the useful signal average power, average power and noise power of the subcarrier locations, respectively.
In this embodiment, the average power of each useful subcarrier contains the energy of noise, and the average power of the useful signal is subtracted from the average power to obtain the noise and interference power.
Step S102: calculating a channel estimation value corresponding to each diversity according to the diversity signal corresponding to each received bit information; and generating bit information after equalization and combination processing as input of a decoder according to the diversity signal, the channel estimation value and the noise power of each subcarrier position.
In this embodiment, in the equalization step, diversity reception data corresponding to each bit information, corresponding symbol index and subcarrier index, are sorted out in the payload information.
Further, generating bit information after equalization and combination processing as an input of a decoder according to the diversity signal, the channel estimation value and the noise power of each subcarrier position, specifically:
performing conjugate multiplication on each diversity signal and a corresponding channel estimation value, and dividing the signal by the noise power of the corresponding diversity to obtain each weighted diversity; combining all the weighted diversity to obtain weighted balanced output;
the weighted equalization output expression is:
wherein I (n) is bit information after equalization and combination processing,l m and k m The OFDM symbol index and the subcarrier position corresponding to each diversity m are respectively provided; h (k) m ) For each diversity-corresponding channel estimation value, m=1, …, M being the diversity number;
and taking the N bits of information after the equalization and combination as the input of a decoder.
In general, the size of soft information corresponds to the likelihood of bit information 0 or 1. The enhanced equalized output values are more reliable in probability distribution than the conventional combining method.
The implementation of the embodiment of the invention has the following effects:
the invention can track the noise intensity in real time by utilizing a plurality of leading or pilot frequency subcarrier signals, and has high accuracy of calculating the signal quality; the invention carries out weighting treatment on each diversity signal before diversity combination, distributes more weight to the diversity with good signal, reduces the weight to the signal with weak signal, and further improves the reliability of the soft information input to the decoder; the invention dynamically adapts to the side effect of various interference signals after elimination, is more beneficial to exerting the characteristics of an error correction coding mechanism, realizes the reduction of the influence of signal quality reduction caused by pulse interference elimination and single-tone interference elimination, and improves the receiving reliability.
Example two
Referring to fig. 2, an enhanced channel equalization apparatus according to an embodiment of the present invention includes: a data processing module 201 and a channel equalization module 202;
the data processing module is used for acquiring a synchronizing signal in high-speed carrier power line communication, wherein the synchronizing signal is a frame of signal subjected to synchronizing operation; determining a plurality of OFDM symbols according to the synchronous signals; calculating useful signal average power of each subcarrier position in each OFDM symbol; obtaining the noise power of each subcarrier position according to the average power and the average power of the useful signals of each subcarrier position;
the channel equalization module is used for calculating a channel estimation value corresponding to each diversity according to the diversity signal corresponding to each received bit information; and generating bit information after equalization and combination processing as input of a decoder according to the diversity signal, the channel estimation value and the noise power of each subcarrier position.
Further, the data processing module includes: an FFT conversion unit and a calculation unit;
the FFT transformation unit is configured to perform FFT transformation on each OFDM symbol, to obtain a corresponding frequency domain signal and a complex value of each subcarrier on the frequency domain, where the complex value includes: the received values of the preamble symbol and the payload information are specifically:
performing FFT (fast Fourier transform) on the L OFDM symbols to obtain L corresponding frequency domain signals;
the expression of the frequency domain signal is: p is p l (k) L=0,..l-1, L is a preamble symbol index, L is a positive integer greater than 1; k=k b ，...，k e K is the index of the useful sub-carrier, k b K is the starting position of the useful subcarrier e Is the end position of the useful subcarrier;
the calculating unit is configured to sequentially calculate a conjugate correlation value of each frequency domain signal, where the conjugate correlation value is obtained by performing conjugate cross-correlation on a frequency domain signal corresponding to a current preamble symbol and a frequency domain signal corresponding to a subsequent preamble symbol, and specifically includes:
let l=0, for p l (k) And p l+1 (k) Performing conjugate cross-correlation on the signals to obtain conjugate correlation values of the first frequency domain signals; the expression of the conjugate correlation value of the first frequency domain signal is:
let l=l+1, calculate the conjugate correlation value of each frequency domain signal sequentially until l=l-2;
the expression of the conjugate correlation value of the frequency domain signal is:
accumulating conjugate correlation values of all frequency domain signals, taking a real part to obtain useful signal power of each subcarrier position, and calculating an average value of the useful signal power to obtain useful signal average power of each subcarrier position;
the expression of the useful signal average power for each subcarrier location is:
the expression of the average power per subcarrier location is:
subtracting the average power of the corresponding useful signal from the average power of each subcarrier position to obtain the noise power of each subcarrier position, wherein the expression of the noise power is as follows:
NI(k)＝P(k)-P s (k)；
wherein P is s (k) P (k) and NI (k) are the useful signal average power, average power and noise power of the subcarrier locations, respectively.
Further, the channel equalization module includes: a diversity processing unit and an output unit;
the diversity processing unit is used for carrying out conjugate multiplication on each diversity signal and a corresponding channel estimation value and dividing the noise power of the corresponding diversity to obtain each weighted diversity; combining all the weighted diversity to obtain weighted balanced output;
the weighted equalization output expression is:
wherein I (n) is bit information after equalization and combination processing,l m and k m The OFDM symbol index and the subcarrier position corresponding to each diversity m are respectively provided; h (k) m ) Channel estimation value corresponding to each diversityM=1,. M, M is the diversity number;
the output unit is used for taking the N bits of information after the equalization and combination processing as the input of the decoder.
The enhanced channel equalization apparatus described above may implement the enhanced channel equalization method of the method embodiment described above. The options in the method embodiments described above are also applicable to this embodiment and will not be described in detail here. The rest of the embodiments of the present application may refer to the content of the method embodiments described above, and in this embodiment, no further description is given.
Example III
Correspondingly, the invention further provides a computer readable storage medium, which comprises a stored computer program, wherein the computer program controls a device where the computer readable storage medium is located to execute the enhanced channel equalization method according to any embodiment.
The computer program may be divided into one or more modules/units, which are stored in the memory and executed by the processor to accomplish the present invention, for example. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used for describing the execution of the computer program in the terminal device.
The terminal equipment can be computing equipment such as a desktop computer, a notebook computer, a palm computer, a cloud server and the like. The terminal device may include, but is not limited to, a processor, a memory.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the terminal device, and which connects various parts of the entire terminal device using various interfaces and lines.
The memory may be used to store the computer program and/or the module, and the processor may implement various functions of the terminal device by running or executing the computer program and/or the module stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the mobile terminal, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Wherein the terminal device integrated modules/units may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as stand alone products. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. An enhanced channel equalization method, comprising:
acquiring a synchronizing signal in high-speed carrier power line communication, wherein the synchronizing signal is a frame of signal subjected to synchronizing operation; determining a plurality of OFDM symbols according to the synchronous signals; calculating useful signal average power of each subcarrier position in each OFDM symbol; obtaining the noise power of each subcarrier position according to the average power and the average power of the useful signals of each subcarrier position;
calculating a channel estimation value corresponding to each diversity according to the diversity signal corresponding to each received bit information; and generating bit information after equalization and combination processing as input of a decoder according to the diversity signal, the channel estimation value and the noise power of each subcarrier position.
2. The method for equalizing an enhanced channel as claimed in claim 1, wherein said calculating the average power of the useful signal at each subcarrier position in each of said OFDM symbols is:
performing FFT (fast Fourier transform) on each OFDM symbol to obtain a corresponding frequency domain signal and a complex value of each subcarrier on the frequency domain, wherein the complex value comprises: a received value of the preamble symbol and the payload information; calculating conjugate correlation values of each frequency domain signal in turn, wherein the conjugate correlation values are obtained by carrying out conjugate cross-correlation on the frequency domain signal corresponding to the current leading symbol and the frequency domain signal corresponding to the next leading symbol;
and accumulating conjugate correlation values of all frequency domain signals, taking a real part to obtain useful signal power of each subcarrier position, and calculating an average value of the useful signal power to obtain useful signal average power of each subcarrier position.
3. The method of claim 2, wherein the FFT is performed on each OFDM symbol to obtain a corresponding frequency domain signal and a complex value of each subcarrier in the frequency domain, specifically:
performing FFT (fast Fourier transform) on the L OFDM symbols to obtain L corresponding frequency domain signals;
the expression of the frequency domain signal is: p is p l (k) L=0,..l-1, L is a preamble symbol index, L is a positive integer greater than 1; k=k b ,...,k e K is the index of the useful sub-carrier, k b K is the starting position of the useful subcarrier e Is the end position of the useful subcarrier.
4. The method of claim 3, wherein the step of sequentially calculating the conjugate correlation value of each frequency domain signal, wherein the conjugate correlation value is obtained by performing conjugate cross-correlation on the frequency domain signal corresponding to the current preamble symbol and the frequency domain signal corresponding to the next preamble symbol, and is specifically:
let l=0, for p l (k) And p l+1 (k) Performing conjugate cross-correlation on the signals to obtain conjugate correlation values of the first frequency domain signals; the expression of the conjugate correlation value of the first frequency domain signal is:
let l=l+1, calculate the conjugate correlation value of each frequency domain signal sequentially until l=l-2;
the expression of the conjugate correlation value of the frequency domain signal is:
5. the method for equalizing an enhanced channel as claimed in claim 4, wherein said obtaining the noise power of each subcarrier location based on the average power and the average power of the useful signal of each subcarrier location is specifically:
the expression of the useful signal average power for each subcarrier location is:
the expression of the average power per subcarrier location is:
subtracting the average power of the corresponding useful signal from the average power of each subcarrier position to obtain the noise power of each subcarrier position, wherein the expression of the noise power is as follows:
NI(k)＝P(k)-P s (k)；
wherein P is s (k) P (k) and NI (k) are the useful signal average power, average power and noise power of the subcarrier locations, respectively.
6. The method of claim 1, wherein generating the bit information after the equalization combining process as the input of the decoder according to the diversity signal, the channel estimation value and the noise power of each subcarrier location comprises:
performing conjugate multiplication on each diversity signal and a corresponding channel estimation value, and dividing the signal by the noise power of the corresponding diversity to obtain each weighted diversity; combining all the weighted diversity to obtain weighted balanced output;
the weighted equalization output expression is:
wherein I (n) is bit information after equalization and combination processing,l m and k m The OFDM symbol index and the subcarrier position corresponding to each diversity m are respectively provided; h (k) m ) For each diversity-corresponding channel estimate, m=1,..m, M is the diversity number;
and taking the N bits of information after the equalization and combination as the input of a decoder.
7. An enhanced channel equalization apparatus, comprising: a data processing module and a channel equalization module;
the data processing module is used for acquiring a synchronizing signal in high-speed carrier power line communication, wherein the synchronizing signal is a frame of signal subjected to synchronizing operation; determining a plurality of OFDM symbols according to the synchronous signals; calculating useful signal average power of each subcarrier position in each OFDM symbol; obtaining the noise power of each subcarrier position according to the average power and the average power of the useful signals of each subcarrier position;
the channel equalization module is used for calculating a channel estimation value corresponding to each diversity according to the diversity signal corresponding to each received bit information; and generating bit information after equalization and combination processing as input of a decoder according to the diversity signal, the channel estimation value and the noise power of each subcarrier position.
8. The apparatus for enhanced channel equalization of claim 7 wherein said data processing module comprises: an FFT conversion unit and a calculation unit;
the FFT transformation unit is configured to perform FFT transformation on each OFDM symbol, to obtain a corresponding frequency domain signal and a complex value of each subcarrier on the frequency domain, where the complex value includes: the received values of the preamble symbol and the payload information are specifically:
performing FFT (fast Fourier transform) on the L OFDM symbols to obtain L corresponding frequency domain signals;
the expression of the frequency domain signal is: p is p l (k) L=0,..l-1, L is a preamble symbol index, L is a positive integer greater than 1; k=k b ,...,k e K is the index of the useful sub-carrier, k b K is the starting position of the useful subcarrier e Is the end position of the useful subcarrier;
the calculating unit is configured to sequentially calculate a conjugate correlation value of each frequency domain signal, where the conjugate correlation value is obtained by performing conjugate cross-correlation on a frequency domain signal corresponding to a current preamble symbol and a frequency domain signal corresponding to a subsequent preamble symbol, and specifically includes:
let l=0, for p l (k) And p l+1 (k) Performing conjugate cross-correlation on the signals to obtain conjugate correlation values of the first frequency domain signals; the expression of the conjugate correlation value of the first frequency domain signal is:
let l=l+1, calculate the conjugate correlation value of each frequency domain signal sequentially until l=l-2;
the expression of the conjugate correlation value of the frequency domain signal is:
accumulating conjugate correlation values of all frequency domain signals, taking a real part to obtain useful signal power of each subcarrier position, and calculating an average value of the useful signal power to obtain useful signal average power of each subcarrier position;
the expression of the useful signal average power for each subcarrier location is:
the expression of the average power per subcarrier location is:
subtracting the average power of the corresponding useful signal from the average power of each subcarrier position to obtain the noise power of each subcarrier position, wherein the expression of the noise power is as follows:
NI(k)＝P(k)-P s (k)；
wherein P is s (k) P (k) and NI (k) are the useful signal average power, average power and noise power of the subcarrier locations, respectively.
9. The apparatus for enhanced channel equalization of claim 7 wherein said channel equalization module comprises: a diversity processing unit and an output unit;
the diversity processing unit is used for carrying out conjugate multiplication on each diversity signal and a corresponding channel estimation value and dividing the noise power of the corresponding diversity to obtain each weighted diversity; combining all the weighted diversity to obtain weighted balanced output;
the weighted equalization output expression is:
wherein I (n) is bit information after equalization and combination processing,l m and k m The OFDM symbol index and the subcarrier position corresponding to each diversity m are respectively provided; h (k) m ) For each diversity-corresponding channel estimate, m=1,..m, M is the diversity number;
the output unit is used for taking the N bits of information after the equalization and combination processing as the input of the decoder.
10. A computer readable storage medium, wherein the computer readable storage medium comprises a stored computer program; wherein said computer program, when run, controls a device in which said computer readable storage medium resides to perform an enhanced channel equalization method as claimed in any one of claims 1 to 6.
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