CN112821920B - Signal processing method, communication chip and communication device - Google Patents
Signal processing method, communication chip and communication device Download PDFInfo
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- CN112821920B CN112821920B CN201911039317.5A CN201911039317A CN112821920B CN 112821920 B CN112821920 B CN 112821920B CN 201911039317 A CN201911039317 A CN 201911039317A CN 112821920 B CN112821920 B CN 112821920B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0005—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to payload information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/007—Unequal error protection
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Abstract
The embodiment of the application provides a signal processing method, a communication chip and a communication device. The communication device receives a first signal from a peer communication device in a first transmission period, the first transmission period includes a plurality of time windows, each time window has a corresponding communication parameter, and data frames transmitted in at least two time windows are modulated according to different communication parameters. If the difference value between the channel quality parameter of the transmission channel corresponding to the first time window and the preset channel quality parameter is greater than the preset threshold value, generating a first communication parameter corresponding to the first time window and a second communication parameter corresponding to the second time window, wherein the first communication parameter comprises a first adjustment amount and a first adjustment trend, the second communication parameter comprises a second adjustment amount and a second adjustment trend, and the first adjustment trend is opposite to the second adjustment trend. Further, the communication apparatus transmits the first communication parameter and the second communication parameter to the counterpart communication apparatus.
Description
Technical Field
The present disclosure relates to the field of power line communication, and in particular, to a signal processing method, a communication chip, and a communication device.
Background
The Power Line Communication (PLC) technology mainly uses a widely existing copper Power line as a transmission medium, and performs signal modulation and demodulation on the Power line through a baseband, thereby achieving the purpose of transmitting information.
In practical applications, a power line communication device (such as a power modem) and a power consumption device (such as a household appliance, an industrial device, etc.) usually operate in the same network. Special circuit structures and components (such as a rectifier circuit, a motor and the like) in the electric equipment can generate high-frequency signals in a power line network, and generate interference on power line communication signals. After a time window in a transmission period has an error packet due to a noise environment change, a receiver firstly retransmits, and after the retransmission reaches a certain number of times, channel estimation is performed, and communication parameters corresponding to the time window are estimated again. However, in this technique, estimating the communication parameters corresponding to each time window is an independent process, and bandwidth fluctuation is caused by each estimation of the communication parameters, which results in poor stability of the whole bandwidth in one transmission cycle.
Disclosure of Invention
The embodiment of the application provides a signal processing method, a communication chip and a communication device.
In a first aspect, an embodiment of the present application provides a signal processing method. The method comprises the following steps.
The communication device receives a first signal from a peer communication device in a first transmission period, the first transmission period includes a plurality of time windows, each time window is used for transmitting at least one data frame, the first signal includes data frames transmitted in at least one time window, each time window has corresponding communication parameters, and the data frames transmitted in at least two time windows are modulated according to different communication parameters. If the difference value between the channel quality parameter of the transmission channel corresponding to the first time window and the preset channel quality parameter is greater than the preset threshold value, generating a first communication parameter corresponding to the first time window and a second communication parameter corresponding to the second time window, wherein the first communication parameter comprises a first adjustment amount and a first adjustment trend, the second communication parameter comprises a second adjustment amount and a second adjustment trend, the first adjustment trend is opposite to the second adjustment trend, and the second time window is at least one time window except the first time window in the first transmission cycle. Further, the communication apparatus transmits the first communication parameter and the second communication parameter to the counterpart communication apparatus.
In this embodiment, each time window in one transmission cycle has a corresponding communication parameter, when a channel quality parameter of a transmission channel corresponding to a first time window changes due to a change in a noise environment, a first communication parameter may be assigned to the first time window, a second communication parameter may be assigned to a second time window, and adjustment trends of the first communication parameter and the second communication parameter are opposite, so that rate complementation may be performed between the first time window and the second time window, so that stability of the overall bandwidth of one transmission cycle is better.
Optionally, in some possible embodiments, if a difference between a channel quality parameter of a transmission channel corresponding to the first time window and a preset channel quality parameter is greater than a preset threshold, the method includes:
if the difference value of the signal-to-noise ratio threshold minus the signal-to-noise ratio of the transmission channel corresponding to the first time window is larger than a first threshold value, if the difference value of the retransmission times minus the retransmission times threshold of the first data frame transmitted in the first time window is larger than a second threshold value, and if the difference value of the error rate of the first data frame minus the error rate threshold is larger than a third threshold value.
In this embodiment, for the first time window with poor noise condition, several specific triggering conditions for adjusting the communication parameters are listed, so that the extensibility of the scheme is improved.
Optionally, in some possible embodiments, the first adjustment trend is a down-regulation trend, the first adjustment amount includes a down-regulation bit number of a first subcarrier corresponding to the first time window, the second adjustment trend is an up-regulation trend, and the second adjustment amount includes an up-regulation bit number of a second subcarrier corresponding to the second time window.
In this embodiment, a specific form of the possible first communication parameter and the second communication parameter is exemplified, and the realizability of the present scheme is improved.
Optionally, in some possible embodiments, if a difference between a channel quality parameter of a transmission channel corresponding to the first time window and a preset channel quality parameter is greater than a preset threshold, the method includes:
at least one condition selected from the group consisting of if a difference between a signal-to-noise ratio of the transmission channel corresponding to the first time window minus the signal-to-noise ratio threshold is greater than a first threshold and if a difference between a noise margin of the transmission channel corresponding to the first time window minus the noise margin threshold is greater than a fourth threshold.
In this embodiment, for the first time window with better noise condition, several specific triggering conditions for adjusting the communication parameters are listed, so as to further improve the extensibility of the scheme.
Optionally, in some possible embodiments, the first adjustment trend is an up-adjustment trend, the first adjustment amount includes an up-adjustment number of bits of a first subcarrier corresponding to the first time window, the second adjustment trend is a down-adjustment trend, and the second adjustment amount includes a down-adjustment number of bits of a second subcarrier corresponding to the second time window.
In this embodiment, another possible specific form of the first communication parameter and the second communication parameter is illustrated, so that the realizability of the scheme is further improved.
Optionally, in some possible embodiments, the method further comprises:
the noise margin of the transmission channel corresponding to the first time window is increased.
In this embodiment, since the noise condition is changing, a margin is required for allocating bits for each time window. The noise margin of the transmission channel corresponding to the first time window is increased so that the first time window may have a larger margin to cope with the increase in noise.
Optionally, in some possible embodiments, the method further comprises:
generating a first Bit Allocation Table (BAT) and a first coding parameter according to the first communication parameter, and generating a second BAT and a second coding parameter according to the second communication parameter. The first encoding parameter and the second encoding parameter may include a modulation order, a Forward Error Correction (FEC) code rate, and the like. The practicability of the scheme is improved.
Optionally, in some possible embodiments, the sending the first communication parameter and the second communication parameter to the peer communication device includes:
a target request is generated, the target request including the first communication parameters and the second communication parameters. Further, a target request is sent to the peer communication device.
In this embodiment, a specific implementation manner for sending the first communication parameter and the second communication parameter to the peer communication device is provided, so that the practicability of the scheme is further improved.
Optionally, in some possible embodiments, the sending the first communication parameter and the second communication parameter to the peer communication device includes:
and generating a first request and a second request, wherein the first request carries the first communication parameters, and the second request carries the second communication parameters. Further, the first request and the second request are transmitted to the peer communication device.
In this embodiment, another specific implementation manner for sending the first communication parameter and the second communication parameter to the peer communication device is provided, so that the flexibility of the scheme is improved.
Optionally, in some possible embodiments, after sending the first communication parameter and the second communication parameter to the peer communication apparatus, the method further includes:
and receiving a second signal from the opposite-end communication device in a second transmission period, wherein the second transmission period comprises a plurality of time windows, the data frame transmitted in the first time window of the second signal is modulated according to the first communication parameter, and the data frame transmitted in the second time window of the second signal is modulated according to the second communication parameter.
In a second aspect, an embodiment of the present application provides a communication apparatus, including:
the system comprises a processor, a memory and a transceiver, wherein the processor, the memory and the transceiver are interconnected through lines, and instructions are stored in the memory;
the transceiver is used for receiving a first signal from a peer communication device in a first transmission period, the first transmission period comprises a plurality of time windows, each time window is used for transmitting at least one data frame, the first signal comprises the data frames transmitted in at least one time window, each time window has corresponding communication parameters, and the data frames transmitted in at least two time windows are modulated according to different communication parameters;
if the difference value between the channel quality parameter of the transmission channel corresponding to the first time window and the preset channel quality parameter is greater than the preset threshold value, the processor is configured to generate a first communication parameter corresponding to the first time window and a second communication parameter corresponding to the second time window, where the first communication parameter includes a first adjustment amount and a first adjustment trend, the second communication parameter includes a second adjustment amount and a second adjustment trend, the first adjustment trend is opposite to the second adjustment trend, and the second time window is at least one time window except the first time window in the first transmission cycle;
the transceiver is used for sending the first communication parameter and the second communication parameter to the opposite-end communication device.
Optionally, in some possible embodiments, if a difference between a channel quality parameter of a transmission channel corresponding to the first time window and a preset channel quality parameter is greater than a preset threshold, the method includes:
if the difference value of the signal-to-noise ratio threshold minus the signal-to-noise ratio of the transmission channel corresponding to the first time window is larger than a first threshold value, if the difference value of the retransmission times minus the retransmission times threshold of the first data frame transmitted in the first time window is larger than a second threshold value, and if the difference value of the error rate of the first data frame minus the error rate threshold is larger than a third threshold value.
Optionally, in some possible embodiments, the first adjustment trend is a down-regulation trend, the first adjustment amount includes a down-regulation bit number of a first subcarrier corresponding to the first time window, the second adjustment trend is an up-regulation trend, and the second adjustment amount includes an up-regulation bit number of a second subcarrier corresponding to the second time window.
Optionally, in some possible embodiments, if a difference between a channel quality parameter of a transmission channel corresponding to the first time window and a preset channel quality parameter is greater than a preset threshold, the method includes:
at least one condition selected from the group consisting of if a difference between a signal-to-noise ratio of the transmission channel corresponding to the first time window minus the signal-to-noise ratio threshold is greater than a first threshold and if a difference between a noise margin of the transmission channel corresponding to the first time window minus the noise margin threshold is greater than a fourth threshold.
Optionally, in some possible embodiments, the first adjustment trend is an up-adjustment trend, the first adjustment amount includes an up-adjustment number of bits of a first subcarrier corresponding to the first time window, the second adjustment trend is a down-adjustment trend, and the second adjustment amount includes a down-adjustment number of bits of a second subcarrier corresponding to the second time window.
Optionally, in some possible embodiments, the processor is further configured to:
the noise margin of the transmission channel corresponding to the first time window is increased.
Optionally, in some possible embodiments, the processor is further configured to:
generating a first bit allocation table BAT and a first coding parameter according to the first communication parameter;
and generating a second BAT and a second coding parameter according to the second communication parameter.
Optionally, in some possible embodiments, the processor is further configured to:
generating a target request, wherein the target request carries a first communication parameter and a second communication parameter;
the transceiver is specifically configured to:
and sending the target request to the opposite-end communication device.
Optionally, in some possible embodiments, the processor is further configured to:
generating a first request and a second request, wherein the first request carries a first communication parameter, and the second request carries a second communication parameter;
the transceiver is specifically configured to:
and sending the first request and the second request to a peer communication device.
Optionally, in some possible embodiments, the transceiver is further configured to:
and receiving a second signal from the opposite-end communication device in a second transmission period, wherein the second transmission period comprises a plurality of time windows, the data frame transmitted in the first time window of the second signal is modulated according to the first communication parameter, and the data frame transmitted in the second time window of the second signal is modulated according to the second communication parameter.
In a third aspect, an embodiment of the present application provides a communication chip, which includes a processor and a memory, where the memory and the processor are interconnected by a line, and the memory stores instructions, and the processor is configured to execute the signal processing method in any implementation manner of the first aspect.
In a fourth aspect, an embodiment of the present application provides a computer storage medium, which includes instructions, when executed on a computer, cause the computer to perform the signal processing method in any one of the embodiments of the first aspect.
In a fifth aspect, the present application provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the signal processing method in any one of the embodiments of the first aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
in the embodiment of the present application, each time window in one transmission cycle has a corresponding communication parameter, when a channel quality parameter of a transmission channel corresponding to a first time window changes due to a change in a noise environment, a first communication parameter may be allocated to the first time window, a second communication parameter may be allocated to a second time window, and adjustment trends of the first communication parameter and the second communication parameter are opposite, so that rate complementation may be performed between the first time window and the second time window, so that stability of the entire bandwidth of one transmission cycle is better.
Drawings
FIG. 1 is a diagram of a transmission cycle divided into a plurality of time windows;
FIG. 2 is a schematic diagram of time windows divided in a transmission period according to noise;
FIG. 3 is a schematic diagram of an embodiment of a signal processing method according to the present application;
FIG. 4 is a schematic illustration of bit swapping between time windows;
fig. 5 is a schematic diagram of a possible communication device.
Detailed Description
The embodiment of the application provides a signal processing method, a communication chip and a communication device. Each time window in a transmission cycle has a corresponding communication parameter, when a channel quality parameter of a transmission channel corresponding to a first time window changes due to a noise environment change, a first communication parameter may be assigned to the first time window, a second communication parameter may be assigned to a second time window, and adjustment trends of the first communication parameter and the second communication parameter are opposite, so that rate complementation may be performed between the first time window and the second time window, so that stability of an overall bandwidth of a transmission cycle is better.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The method is mainly applied to a communication scene of dividing a plurality of time windows (communication windows) based on one transmission cycle. For example, fig. 1 is a diagram illustrating a transmission cycle divided into a plurality of time windows. In the design of a protocol, the power line communication can use 2 Alternating Current (AC) periods as Medium Access Control (MAC) periods of the protocol communication according to the channel characteristics of the power line. And then, one MAC period is divided into a plurality of time windows on the time domain according to the impedance change characteristics of the electric appliance so as to maximally utilize the channel capacity. As shown in fig. 1, an AC cycle is divided into 4 time windows, each of which communicates using independent communication parameters.
Fig. 2 is a schematic diagram of dividing time windows in a transmission period according to noise conditions. Taking the noise situation generated by the household appliance in operation as an example, the noise generated by the household appliance is different at different AC cycle positions, the time windows can be divided based on the noise situation, and different communication parameters can be used for communication in different time windows.
A signal processing method provided in an embodiment of the present application is introduced as follows:
referring to fig. 3, an embodiment of a signal processing method of the present application includes:
301. a first signal from a peer communications device is received during a first transmission period.
In this embodiment, the first transmission period includes a plurality of time windows, where the time windows are divided to ensure that each time window can transmit at least one complete data frame. It can be understood that, in practical applications, the time window may be divided in an equal-length manner or in a different-length manner within one transmission period, and is not limited herein. In addition, the type of the transmission period in the present application may be various, for example, the transmission period may be an AC period or a MAC period as shown in fig. 1, and is not limited herein.
The first signal comprises in particular data frames transmitted within at least one time window. That is, the first signal may be a data frame transmitted in a certain time window, or may be a data frame transmitted in a plurality of time windows.
It should be noted that each time window has a corresponding communication parameter, that is, the data frame transmitted in each time window is modulated by the corresponding communication parameter. And because the noise condition may be different in different periods of one transmission cycle, the communication parameters corresponding to at least two time windows in the first transmission cycle are different.
302. If the difference value between the channel quality parameter of the transmission channel corresponding to the first time window and the preset channel quality parameter is larger than the preset threshold value, generating a first communication parameter corresponding to the first time window and a second communication parameter corresponding to the second time window.
In this embodiment, the communication device may monitor the received first signal, specifically, need to acquire the channel quality parameters of the transmission channels corresponding to each time window, and determine whether the channel quality parameters satisfy the trigger condition to trigger the adjustment of the communication parameters corresponding to the time window. The first communication parameter comprises a first adjustment amount and a first adjustment trend, the second communication parameter comprises a second adjustment amount and a second adjustment trend, and the first adjustment trend is opposite to the second adjustment trend. It is to be understood that the second time window is at least one time window other than the first time window in the first transmission period.
The first adjustment amount indicates an adjustment amount for the number of bits carried by a first subcarrier corresponding to the first time window, and the second adjustment amount indicates an adjustment amount for the number of bits carried by a second subcarrier corresponding to the second time window. The first adjustment trend includes a trend of increasing or decreasing the number of bits carried by the first subcarrier, and the second adjustment trend includes a trend of increasing or decreasing the number of bits carried by the second subcarrier. In an extensible way, increasing or decreasing the number of bits carried by the subcarriers can be replaced by increasing or decreasing other parameters capable of changing the quality of the transmission channel. For convenience of description, the corresponding adjustment amount and adjustment trend are expressed by the number of up bits or the number of down bits in the following. For example, if the number of down-regulation bits of the first subcarrier corresponding to the first time window is determined, correspondingly, the number of up-regulation bits of the second subcarrier corresponding to the second time window needs to be determined. If the number of the uplink bits of the first subcarrier corresponding to the first time window is determined, correspondingly, the number of the downlink bits of the second subcarrier corresponding to the second time window needs to be determined.
It should be noted that the trigger conditions may be various, and the communication parameter adjustment strategies corresponding to different trigger conditions are also different, which are described below:
first, if there is a first time window with poor noise condition in the first transmission cycle and there is a second time window with good noise condition, then bit swapping can be performed based on the first time window and the second time window.
Specifically, when the channel quality parameter of the transmission channel corresponding to the first time window meets at least one of the following three first trigger conditions, the communication device may be triggered to generate the first communication parameter corresponding to the first time window and the second communication parameter corresponding to the second time window. The three first trigger conditions are as follows:
1. the difference value of the signal-to-noise ratio threshold minus the signal-to-noise ratio of the transmission channel corresponding to the first time window is larger than the first threshold.
2. The difference between the retransmission times of the first data frame and the threshold of the retransmission times is larger than a second threshold value.
3. The difference value of the error rate of the first data frame minus the error rate threshold is larger than a third threshold value.
It should be noted that, because the noise condition of the first time window is poor, the down-regulation bit number of the first subcarrier corresponding to the first time window needs to be determined, and in order to make the stability of the whole bandwidth of one transmission cycle better, the up-regulation bit number of the second subcarrier corresponding to the second time window needs to be determined.
Further, the communication device may generate a first Bit Allocation Table (BAT) and a first coding parameter according to a down-regulation Bit number corresponding to the first time window, and generate a second BAT and a second coding parameter according to an up-regulation Bit number corresponding to the second time window. The first bit allocation table may record the number of bits carried by the first subcarrier corresponding to the first time window. The second bit allocation table may record the number of bits carried by the second subcarrier corresponding to the second time window. The encoding parameters may include a modulation order, a Forward Error Correction (FEC) code rate, and the like. It can be understood that, in order to improve the noise immunity, a higher FEC code rate needs to be configured.
Optionally, the first time window may be a certain time window in the first transmission cycle, or may include multiple time windows in the first transmission cycle. That is, in practical applications, the communication parameters corresponding to each time window may be adjusted one by one, or the communication parameters corresponding to a plurality of time windows may be adjusted at a time.
It should be noted that when deploying services, it is generally required that the rate of power line communication cannot fluctuate greatly, and the goal is to maintain a stable rate, which requires that the sum of the rates of multiple time windows of a transmission period is kept constant. It can be understood that, in order to ensure that the total communication rate of the first transmission period is not changed, the number of down-regulation bits of the first subcarrier corresponding to the first time window should be less than or equal to the number of up-regulation bits of the second subcarrier corresponding to the second time window. That is, the second time window has sufficient margin to compensate for the number of bits adjusted downward in the first time window. In this case, the communication device may determine the first bit allocation table and the second bit allocation table according to the down-adjusted bit number of the first subcarrier corresponding to the first time window, that is, the down-adjusted bit number in the first time window is complemented in the second time window.
For example, fig. 4 is a schematic diagram of bit swapping between time windows. The AC or MAC period comprises 8 time windows of A-H, the first time window comprises a C time window, a D time window and an E time window, and the second time window comprises an A time window, a B time window, an F time window and an H time window. The communication device obtains the total sum of the down-regulation Bit numbers of the C time window, the D time window and the E time window as Bit1, and obtains the total sum of the up-regulation Bit numbers of the a time window, the B time window, the F time window and the H time window as Bit2, since Bit2 is greater than Bit1, the C time window, the D time window and the E time window can be reduced by the Bit number of the total of Bit1 in the first Bit allocation table, and the a time window, the B time window, the F time window and the H time window can be increased by the Bit number of the total of Bit1 in the second Bit allocation table, as to how much each time window is increased or reduced, which is not limited herein.
In addition, in practical applications, the second time window does not occur each time, and there is enough margin to compensate the adjusted bit number in the first time window. That is, if the number of up bits is less than the number of down bits (Bit2 is less than Bit1), the sum of the rates of the time windows of the first transmission period needs to be decreased. Specifically, in order to make the magnitude of the speed reduction smaller, the communication device may compensate the number of bits adjusted downward in the first time window by using the margin of the second time window as much as possible. For example, in the first Bit allocation table, the number of bits that sum to Bit1 is decreased for the C time window, the D time window, and the E time window, and the number of bits that sum to Bit2 is increased for the a time window, the B time window, the F time window, and the H time window, and the number of bits that each time window is increased or decreased is not limited herein.
Secondly, if there is a first time window with better noise condition in the first transmission cycle and there is a second time window with worse noise condition, then the bit exchange can be performed based on the first time window and the second time window.
Specifically, when the channel quality parameter of the transmission channel corresponding to the first time window meets at least one of the following two second trigger conditions, the communication device may be triggered to generate the first communication parameter corresponding to the first time window and the second communication parameter corresponding to the second time window. Wherein the two second trigger conditions are as follows:
1. the difference value of the signal-to-noise ratio minus the signal-to-noise ratio threshold of the transmission channel corresponding to the first time window is larger than the first threshold.
2. The noise Margin (SNR Margin) of the transmission channel for the first time window is greater than the fourth threshold.
It should be noted that, because the noise condition of the first time window is better, the number of bits for up-regulation of the first subcarrier corresponding to the first time window can be determined, and even if the number of bits for the second subcarrier corresponding to the second time window needs to be down-regulated because the noise condition of the second time window is worse, the stability of the whole bandwidth of one transmission cycle can be maintained.
It will be appreciated that since the noise conditions are changing, a margin is required to allocate bits for each time window. The effect is that if the noise of a certain time window becomes large suddenly, the data transmitted in the time window can use the margin to ensure normal transmission without disconnection. The margin is referred to as a noise margin, and a larger noise margin indicates better noise in the time window.
Further, the communication device may generate a first BAT and a first coding parameter according to an up-modulation number of bits corresponding to the first time window, and generate a second BAT and a second coding parameter according to a down-modulation number of bits corresponding to the second time window.
Optionally, the communication device may further increase a noise margin of a transmission channel corresponding to the first time window due to the larger bandwidth redundancy of the first time window.
It should be noted that the present application includes, but is not limited to, the first trigger condition and the second trigger condition listed above, and other possible trigger conditions of channel quality parameter variation due to noise variation are within the scope of the present application.
Optionally, in addition to the two listed communication parameter adjustment strategies based on different triggering conditions, the communication device may also search a communication parameter template corresponding to the time window from the communication parameter database according to the monitoring condition of the noise. Specifically, the communication device may perform spectrum analysis on the signal transmitted in the time window to obtain a noise power spectrum, where the noise power spectrum includes noise powers corresponding to different frequency points of the signal. The mapping relation between the noise power spectrum and the communication parameters is recorded in the communication parameter data, and then the communication device can search the communication parameters corresponding to the input noise power spectrum from the communication parameter template library.
303. And sending the first communication parameters and the second communication parameters to the opposite-end communication device.
In this embodiment, the communication device sends the generated first communication parameter and second communication parameter to the peer communication device. Specifically, the communication device initiates a target request to the opposite-end communication device, where the target request may carry the first communication parameter and the second communication parameter. And the opposite-end communication device replies a confirmation message after receiving the target request, and then modulates and transmits the signals to be transmitted by using the first communication parameters and the second communication parameters respectively.
Optionally, the communication device may further send the first communication parameter and the second communication parameter to the opposite-end communication device in batches, for example, the communication device generates a first request and a second request, where the first request carries the first communication parameter and the second request carries the second communication parameter. Further, the communication apparatus transmits the first request and the second request to the counterpart communication apparatus.
It should be noted that, the peer communications apparatus may modulate the data frame number transmitted in the first time window of the next transmission period by using the first communication parameter, and modulate the data frame number transmitted in the second time window of the next transmission period by using the second communication parameter.
In the embodiment of the present application, each time window in one transmission cycle has a corresponding communication parameter, when a channel quality parameter of a transmission channel corresponding to a first time window changes due to a change in a noise environment, a first communication parameter may be allocated to the first time window, a second communication parameter may be allocated to a second time window, and adjustment trends of the first communication parameter and the second communication parameter are opposite, so that rate complementation may be performed between the first time window and the second time window, so that stability of the entire bandwidth of one transmission cycle is better.
The signal processing method in the embodiment of the present application is described above, and the following describes the communication apparatus in the embodiment of the present application:
fig. 5 is a schematic diagram of a possible communication device. The communication device includes a processor 501, a memory 502, and a transceiver 503. The processor 501, memory 502 and transceiver 503 are interconnected by wires, wherein the memory 502 is used to store program instructions and data. The transceiver 503 includes a transmitter and a receiver. It should be noted that the communication device may be a device that implements the signal processing method in the embodiment shown in fig. 3.
In one possible implementation, the memory 502 stores program instructions and data supporting the steps shown in fig. 3, and the processor 501 and the transceiver 503 are used to perform the method steps shown in fig. 3. Specifically, the processor 501 is configured to execute step 302, and the transceiver 503 is configured to execute step 301 and step 303.
The embodiment of the application also provides a communication chip. Integrated with circuitry and one or more interfaces to implement the functionality of the processor 501 described above. When the chip has memory integrated therein, the chip may perform the method steps of any one or more of the foregoing embodiments. When the chip is not integrated with the memory, the chip can be connected with the external memory through an interface. The chip implements the actions performed by the transmitter in the above embodiments according to program codes stored in an external memory.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a random access memory, or the like. Specifically, for example: the processing unit or processor may be a central processing unit, a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
When implemented in software, the method steps described in the above embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Finally, it should be noted that: the above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (21)
1. A signal processing method, comprising:
receiving a first signal from a peer communication device in a first transmission period, wherein the first transmission period comprises a plurality of time windows, each time window is used for transmitting at least one data frame, the first signal comprises the data frames transmitted in at least one time window, each time window has a corresponding communication parameter, and the data frames transmitted in at least two time windows are modulated according to different communication parameters;
if the difference value between the channel quality parameter of the transmission channel corresponding to the first time window and the preset channel quality parameter is greater than a preset threshold value, generating a first communication parameter corresponding to the first time window and a second communication parameter corresponding to the second time window, wherein the first communication parameter comprises a first adjustment amount and a first adjustment trend, the second communication parameter comprises a second adjustment amount and a second adjustment trend, the first adjustment trend is opposite to the second adjustment trend, and the second time window is at least one time window except the first time window in the first transmission cycle;
and sending the first communication parameter and the second communication parameter to the opposite-end communication device.
2. The method of claim 1, wherein if the difference between the channel quality parameter of the transmission channel corresponding to the first time window and a preset channel quality parameter is greater than a preset threshold, the method comprises:
if the difference value of the signal-to-noise ratio threshold minus the signal-to-noise ratio of the transmission channel corresponding to the first time window is larger than a first threshold, if the difference value of the retransmission times minus the retransmission times threshold of the first data frame transmitted in the first time window is larger than a second threshold, and if the difference value of the error rate of the first data frame minus the error rate threshold is larger than a third threshold.
3. The method according to claim 2, wherein the first adjustment trend is a down-regulation trend, the first adjustment amount includes a down-regulation bit number of a first subcarrier corresponding to the first time window, the second adjustment trend is an up-regulation trend, and the second adjustment amount includes an up-regulation bit number of a second subcarrier corresponding to the second time window.
4. The method of claim 1, wherein if the difference between the channel quality parameter of the transmission channel corresponding to the first time window and a preset channel quality parameter is greater than a preset threshold, the method comprises:
and if the difference between the signal-to-noise ratio of the transmission channel corresponding to the first time window and the signal-to-noise ratio threshold is greater than a first threshold, and if the difference between the noise tolerance of the transmission channel corresponding to the first time window and the noise tolerance threshold is greater than a fourth threshold.
5. The method according to claim 4, wherein the first adjustment trend is an up-regulation trend, the first adjustment quantity comprises an up-regulation bit number of a first subcarrier corresponding to the first time window, the second adjustment trend is a down-regulation trend, and the second adjustment quantity comprises a down-regulation bit number of a second subcarrier corresponding to the second time window.
6. The method according to claim 4 or 5, characterized in that the method further comprises:
and increasing the noise margin of the transmission channel corresponding to the first time window.
7. The method according to any one of claims 1 to 5, further comprising:
generating a first Bit Allocation Table (BAT) and a first coding parameter according to the first communication parameter;
and generating a second BAT and a second coding parameter according to the second communication parameter.
8. The method according to any one of claims 1 to 5, wherein sending the first communication parameter and the second communication parameter to the peer communication device comprises:
generating a target request, wherein the target request carries the first communication parameter and the second communication parameter;
and sending the target request to the opposite-end communication device.
9. The method according to any one of claims 1 to 5, wherein sending the first communication parameter and the second communication parameter to the peer communication device comprises:
generating a first request and a second request, wherein the first request carries the first communication parameter, and the second request carries the second communication parameter;
and sending the first request and the second request to the opposite-end communication device.
10. The method according to any one of claims 1 to 5, wherein after sending the first communication parameter and the second communication parameter to the peer communication device, the method further comprises:
receiving a second signal from the peer communications device in a second transmission period, where the second transmission period includes the plurality of time windows, a data frame of the second signal transmitted in the first time window is modulated according to the first communications parameter, and a data frame of the second signal transmitted in the second time window is modulated according to the second communications parameter.
11. A communications apparatus, comprising:
the system comprises a processor, a memory and a transceiver, wherein the processor, the memory and the transceiver are interconnected through lines, and instructions are stored in the memory;
the transceiver is configured to receive a first signal from a peer communications device in a first transmission period, where the first transmission period includes a plurality of time windows, each of the time windows is used for transmitting at least one data frame, the first signal includes data frames transmitted in at least one of the time windows, each of the time windows has corresponding communications parameters, and data frames transmitted in at least two of the time windows are modulated according to different communications parameters;
if the difference between the channel quality parameter of the transmission channel corresponding to the first time window and the preset channel quality parameter is greater than a preset threshold, the processor is configured to generate a first communication parameter corresponding to the first time window and a second communication parameter corresponding to the second time window, where the first communication parameter includes a first adjustment amount and a first adjustment trend, the second communication parameter includes a second adjustment amount and a second adjustment trend, the first adjustment trend is opposite to the second adjustment trend, and the second time window is at least one time window other than the first time window in the first transmission cycle;
the transceiver is configured to send the first communication parameter and the second communication parameter to the peer communication apparatus.
12. The communication apparatus according to claim 11, wherein if the difference between the channel quality parameter of the transmission channel corresponding to the first time window and a preset channel quality parameter is greater than a preset threshold, the method comprises:
if the difference value of the signal-to-noise ratio threshold minus the signal-to-noise ratio of the transmission channel corresponding to the first time window is larger than a first threshold, if the difference value of the retransmission times minus the retransmission times threshold of the first data frame transmitted in the first time window is larger than a second threshold, and if the difference value of the error rate of the first data frame minus the error rate threshold is larger than a third threshold.
13. The apparatus according to claim 12, wherein the first adjustment trend is a down-regulation trend, the first adjustment quantity comprises a down-regulation bit number of a first subcarrier corresponding to the first time window, the second adjustment trend is an up-regulation trend, and the second adjustment quantity comprises an up-regulation bit number of a second subcarrier corresponding to the second time window.
14. The communication apparatus according to claim 11, wherein if the difference between the channel quality parameter of the transmission channel corresponding to the first time window and a preset channel quality parameter is greater than a preset threshold, the method comprises:
and if the difference between the signal-to-noise ratio of the transmission channel corresponding to the first time window and the signal-to-noise ratio threshold is greater than a first threshold, and if the difference between the noise tolerance of the transmission channel corresponding to the first time window and the noise tolerance threshold is greater than a fourth threshold.
15. The apparatus according to claim 14, wherein the first adjustment trend is an up-regulation trend, the first adjustment quantity comprises an up-regulation bit number of a first subcarrier corresponding to the first time window, the second adjustment trend is a down-regulation trend, and the second adjustment quantity comprises a down-regulation bit number of a second subcarrier corresponding to the second time window.
16. The communications apparatus of claim 14 or 15, wherein the processor is further configured to:
and increasing the noise margin of the transmission channel corresponding to the first time window.
17. The communications device of any of claims 11-15, wherein the processor is further configured to:
generating a first Bit Allocation Table (BAT) and a first coding parameter according to the first communication parameter;
and generating a second BAT and a second coding parameter according to the second communication parameter.
18. The communications device of any of claims 11-15, wherein the processor is further configured to:
generating a target request, wherein the target request carries the first communication parameter and the second communication parameter;
the transceiver is specifically configured to:
and sending the target request to the opposite-end communication device.
19. The communications device of any of claims 11-15, wherein the processor is further configured to:
generating a first request and a second request, wherein the first request carries the first communication parameter, and the second request carries the second communication parameter;
the transceiver is specifically configured to:
and sending the first request and the second request to the opposite-end communication device.
20. The communications device of any of claims 11 to 15, wherein the transceiver is further configured to:
receiving a second signal from the peer communications device in a second transmission period, where the second transmission period includes the plurality of time windows, a data frame of the second signal transmitted in the first time window is modulated according to the first communications parameter, and a data frame of the second signal transmitted in the second time window is modulated according to the second communications parameter.
21. A communication chip comprising a processor and a memory, the memory and the processor being interconnected by a line, the memory having stored therein instructions, the processor being configured to perform the signal processing method of any one of claims 1 to 10.
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| CN104205951A (en) * | 2012-04-04 | 2014-12-10 | 诺基亚公司 | Method and apparatus for transmission synchronization |
| CN103037524A (en) * | 2013-01-18 | 2013-04-10 | 东莞宇龙通信科技有限公司 | Double-period dynamic configuration method for ratio between TDD (Time Division Duplex) uplink subframes and TDD downlink subframes, base station, system and communication equipment |
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