CN107395318B - Apparatus and method for selecting a frequency map - Google Patents
Apparatus and method for selecting a frequency map Download PDFInfo
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- CN107395318B CN107395318B CN201610326295.0A CN201610326295A CN107395318B CN 107395318 B CN107395318 B CN 107395318B CN 201610326295 A CN201610326295 A CN 201610326295A CN 107395318 B CN107395318 B CN 107395318B
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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
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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
- H04B3/544—Setting up communications; Call and signalling arrangements
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- Circuits Of Receivers In General (AREA)
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Abstract
The invention discloses a signal frequency diagram selecting device, comprising: a unit symbol bit number providing circuit for providing a plurality of unit symbol bit numbers, wherein each unit symbol bit number is associated with a frequency map; a calculation circuit for performing a specific operation on the plurality of unit symbol bits to generate a calculation result; and a selection circuit for finding out a predetermined relationship from the plurality of unit symbol bit numbers, so as to use the frequency map associated with the unit symbol bit number in accordance with the predetermined relationship as an default frequency map.
Description
Technical Field
The present invention relates to a device and a method for selecting an information frequency map, and more particularly, to a device and a method for selecting an information frequency map according to the number of bits of a unit symbol.
Background
In a Power Line Communication (PLC) system, a Signal receiving end estimates a Signal-to-Noise Ratio (SNR) of a received Signal for each Time Interval (Time Interval), and transmits the estimation result back to a Signal transmitting end, so that the Signal transmitting end can determine an appropriate Signal carrier modulation scheme accordingly, that is, the Signal transmitting end finds a Signal carrier modulation scheme suitable for a Time Interval on the premise of satisfying a target Bit Error Rate (BER), and the found result is called a Tone Map (Tone Map).
In addition to the pilot Map of each Interval, a Default Tone Map (Default Tone Map) can be used as the pilot Map of any Interval, but the Default Tone Map is usually used as the pilot Map of an Interval to be re-estimated (uunable Interval), once the pilot Map of a certain Interval is deemed invalid, the Interval is the Interval to be re-estimated, and the sender will use the Interval to be re-estimated according to the Default Tone Map to transmit data until the pilot Map of the Interval to be re-estimated is re-estimated. Therefore, the intra-timing map is required to reflect the channel status in real time to avoid the over-high error rate of data transmission.
In the prior art, there are three ways to select the default pilot frequency pattern, which are: using a QPSK (Quadrature Phase-Shift Keying) signal frequency diagram as an internal fixed frequency diagram; using the new estimated signal frequency diagram as the default signal frequency diagram; and always using the original default pilot frequency pattern. However, any of the above methods has the following disadvantages: the current condition of the channel cannot be reflected; and the situation of each interval cannot be taken into consideration.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a device, method and system for selecting a frequency map to improve the prior art.
The invention discloses a signal frequency diagram selecting device, one embodiment of which comprises: a unit symbol bit number providing circuit for providing a plurality of unit symbol bit numbers, wherein each unit symbol bit number is associated with a frequency map; a calculation circuit for performing a specific operation on the plurality of unit symbol bits to generate a calculation result; and a selection circuit for finding out a predetermined relationship from the plurality of unit symbol bit numbers, so as to use the effective frequency map associated with the unit symbol bit number in accordance with the predetermined relationship as an default frequency map.
The invention further discloses a signal frequency diagram selection method, which is applied to a signal receiving end of a power line communication system, and one embodiment of the method comprises the following steps: obtaining a plurality of unit symbol bit numbers, wherein each unit symbol bit number is associated with a frequency map; performing a specific operation on the plurality of unit symbol bits to generate a calculation result; and finding out a predetermined relationship between the calculated result and the unit symbol bit number from the plurality of unit symbol bit numbers, thereby selecting the frequency map associated with the unit symbol bit number according with the predetermined relationship as an default frequency map.
The features, operation and efficacy of the present invention will be described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a diagram of an embodiment of a signal-frequency diagram selection apparatus according to the present invention;
FIG. 2 is a schematic diagram of one embodiment of the computational circuit of FIG. 1;
FIG. 3 is a schematic diagram of one embodiment of the selection circuit of FIG. 1;
FIG. 4 is a diagram illustrating an alternative embodiment of a signal-frequency diagram selector according to the present invention;
FIG. 5 is a diagram illustrating an embodiment of a circuit for determining whether a signal frequency diagram is valid according to the present invention;
FIG. 6 is a diagram illustrating a method for selecting a frequency map according to an embodiment of the present invention; and
FIG. 7 is a diagram of a system for selecting a frequency map according to an embodiment of the present invention.
Description of the symbols
100 signal frequency diagram selector
110 unit symbol bit number providing circuit
120 calculation circuit
130 selection circuit
210 multiplier
220 adder
230 divider
W0, …, WN weight values
310 subtracter
320 decision unit
400 signal frequency diagram selecting device
410 control circuit
500 judge circuit
510-bit error rate calculation unit
520 detection unit
530 judging unit
BER _ exceeded detection result
New _ TM new tone map indication
S610 to S630
700 signal frequency diagram selection system
710 receiving circuit
712 signal frequency diagram selecting device
720 transfer circuit
Detailed Description
The invention discloses a device, a method and a system for selecting a message frequency chart, which can flexibly determine a default message frequency chart according to the situation of each transmission interval so as to improve the data throughput.
Referring to fig. 1, which is a schematic diagram of an embodiment of an apparatus for selecting a frequency map according to the present invention, as shown in fig. 1, the apparatus 100 for selecting a frequency map includes: a unit symbol bit number providing circuit 110; a calculation circuit 120; and a selection circuit 130. The unit symbol Bit Number providing circuit 110 is used to provide a plurality of unit symbol Bit numbers (Bit Number Persymbol), wherein each unit symbol Bit Number is associated with an effective frequency map and a corresponding frequency map index (Tone map index, TMI), please note that the unit symbol Bit Number providing circuit 110 can be used to provide a plurality of unit symbol Bit numbers, but does not represent that a plurality of unit symbol Bit numbers can be provided at present. In detail, each frequency map includes information of the signal carrier modulation method, and the corresponding unit symbol bit number can be known according to the information of the signal carrier modulation method of the frequency map, so the unit symbol bit number providing circuit 110 can obtain the corresponding unit symbol bit number from each frequency map obtained by the signal receiving end. The calculating circuit 120 is used for performing a specific operation on the plurality of unit symbol bit numbers, such as a weighting operation or other known or implemented user-defined operation, to generate a calculation result. The selection circuit 130 is used to find out the one corresponding to a predetermined relationship with the calculation result from the plurality of unit symbol bit numbers (for example, the one corresponding to the predetermined relationship or the one corresponding to the predetermined relationship is found to be the closest or the closest and not larger than the calculation result), so as to use the effective frequency Map associated with the unit symbol bit number corresponding to the predetermined relationship as an Default Tone Map (Default Tone Map), or to use the effective frequency Map associated with the one corresponding to a predetermined condition (for example, the smallest one) in the plurality of unit symbol bit numbers as the Default Tone Map.
For example, the selection circuit 130 can find the one closest to or closest to the unit symbol bit number and not greater than the calculation result to meet the predetermined relationship, so as to use the associated effective frequency map as the default frequency map, wherein the selection circuit 130 selects the unit symbol bit number not greater than the calculation result to avoid overestimating the data throughput that can be carried by the channel, which is not limited, and the skilled person can set the conditions according to the requirement. In addition, the selection circuit 130 can also select the smallest one from the plurality of unit symbol bit numbers to meet the predetermined condition, and use the associated effective frequency map as the default frequency map, wherein the selection circuit 130 can select the smallest one to ensure that the signal can be transmitted smoothly without requiring a fast transmission speed. To implement the above example, embodiments of the calculating circuit 120 and the selecting circuit 130 are shown in fig. 2 and fig. 3, respectively, and will be described in detail later.
Referring to fig. 2, the calculating circuit 120 includes: a plurality of multipliers 210 for generating a plurality of weighted values according to a plurality of weighted values (W0, …, WN, wherein the subscript N is a positive integer) and the unit symbol bit numbers; an adder 220 for adding the weighted values to generate a sum; and a divider 230 for dividing the total value by the sum of the weighted values to obtain the calculation result. Referring to fig. 3, the selection circuit 130 includes: subtracters 310, which are used to subtract the calculation results from the unit symbol bit numbers to obtain subtraction values; and a determining unit 320 for finding out the closest or closest and not greater than the calculated result of the plurality of unit symbol bit numbers according to the subtraction values to satisfy the predetermined relationship, or for finding out the smallest of the plurality of unit symbol bit numbers to satisfy the predetermined condition. Since those skilled in the art can implement and/or adjust the structure and connection relationship of the unit symbol bit number providing circuit 110, the calculating circuit 120 and the selecting circuit 130 according to the requirements based on the disclosure of the present specification and the existing knowledge and technology in the field, the repetitive and redundant description will be omitted here.
Referring to fig. 4, which is a schematic diagram of an apparatus for selecting a frequency map according to another embodiment of the present invention, as shown in fig. 4, the apparatus 400 further includes: a control circuit 410, for the calculating circuit 120 to apply a first weighting calculation to the plurality of unit symbol bit numbers when a first condition is satisfied, or for the calculating circuit 120 to apply a second weighting calculation to the plurality of unit symbol bit numbers when a second condition is satisfied, thereby generating the calculation result, wherein the first and second weighting calculations are different, and can be implemented by the control circuit 410 setting the weighting values of fig. 3. More specifically, the aforesaid effective frequency maps are included in (the meaning of "included in" in this specification includes "equal to") a plurality of frequency maps, and the first condition includes that the effective frequency maps include at least one new frequency map (which may be one of the effective frequency maps), since the new frequency map is most capable of reflecting the current channel state, the first weighting calculation is to give a higher weight to the unit symbol bit number associated with the new frequency map, and give a lower weight to the unit symbol bit number associated with other effective frequency maps, and the weight value can be determined by the implementer as required; the second condition comprises that the plurality of frequency maps comprise at least one invalid frequency map, the second weighting calculation is to give a weight to the unit symbol bits from high to low according to the high-low order of the unit symbol bits to obtain a calculation result (in this case, the second condition may comprise that a bit error rate is less than a preset value), or give a weight to the unit symbol bits from low to high to obtain a calculation result (in this case, the second condition may comprise that the bit error rate is greater than a preset value).
As mentioned above, the determination of whether the frequency map is valid or not can be implemented by the determining circuit 500 of fig. 5, and the determining circuit 500 can be included in the control circuit 410 of fig. 4 or be a separate circuit. As shown in fig. 5, the determining circuit 500 includes: a bit error Rate calculation unit 510, for calculating the Bit Error Rate (BER) of the data received by the section corresponding to a certain frequency map, and generating a BER calculation result; a detecting unit 520, configured to detect whether the BER calculation result falls within a predetermined range according to at least one BER threshold (e.g., a high BER threshold and a low BER threshold), and accordingly generate a detection result, where the detection result corresponds to a first value (indicating that the BER calculation result is acceptable) if the BER calculation result falls within the predetermined range, and corresponds to a second value if the BER calculation result is not within the predetermined range; and a determining unit 530 for outputting a determining result according to the detecting result to indicate whether the one frequency map is valid, for example, outputting the determining result to indicate that the one frequency map is valid when the detecting result corresponds to the first value. In addition, the determining unit 530 is further configured to output the determination result to indicate that the certain frequency map is valid when a new frequency map indicator (denoted as new _ TM) indicates that the certain frequency map is a new frequency map, wherein the new frequency map indicator can be generated by a frequency map estimator (not shown). How the frequency map estimator estimates the frequency map is the prior art and is not described herein.
Referring to fig. 4, in an alternative embodiment, the control circuit 410 is configured to enable the selection circuit 130 to use the effective frequency map associated with the unit symbol bit number meeting the predetermined relationship as the default frequency map when the calculation result is greater than a threshold value; and is used to make the selection circuit 130 use the effective frequency map associated with the one (e.g. the smallest) meeting the predetermined condition in the unit symbol bit numbers as the internal fixed frequency map when the calculation result is smaller than the threshold value, wherein the comparison between the calculation result and the threshold value can be realized by a comparator (not shown) included in the control circuit 410 or an equivalent element thereof, and the size of the threshold value can be determined by an implementer as required and can be used to avoid an extreme situation, e.g. to directly make the selection circuit 130 select the effective frequency map associated with the smallest one in the unit symbol bit numbers as the internal fixed frequency map when the calculation result is too small.
Referring again to fig. 4, in an alternative embodiment, the control circuit 410 is configured to perform the following steps: determining whether a number of valid frequency maps satisfies a predetermined number (e.g., determining whether the number of valid frequency maps is less than 2); if the control circuit 410 determines that the number of valid signal frequency patterns satisfies the predetermined number, a predetermined signal frequency pattern is used as the default signal frequency pattern (for example, when the control circuit 410 determines that the number of valid signal frequency patterns is equal to 0, the signal frequency pattern modulated by QPSK is used as the default signal frequency pattern), or a unique signal frequency pattern is used as the default signal frequency pattern (for example, when the control circuit 410 determines that the number of valid signal frequency patterns is equal to 1, the unique signal frequency pattern is used as the default signal frequency pattern). The above-mentioned number judgment can be realized by a combination of an adder and a comparator included in the control circuit 410 or an equivalent element thereof.
In addition to the above devices, the present invention further provides a method for selecting a frequency map, which can be implemented by the frequency map selecting device 100 of fig. 1. One embodiment of the method, as shown in FIG. 6, comprises the following steps:
step S610: a plurality of unit symbol bit numbers are obtained, wherein each unit symbol bit number is associated with an effective frequency map. The details and variations of this step can be derived or derived from the description of the embodiments of the apparatus.
Step S620: applying a specific operation to the plurality of unit symbol bits to generate a calculation result. The details and variations of this step can be derived or derived from the description of the embodiments of the apparatus.
Step S630: finding out the relation of the calculation result and the unit symbol bit number which is in accordance with a predetermined relation from the unit symbol bit numbers, thereby selecting the effective frequency chart associated with the unit symbol bit number which is in accordance with the predetermined relation as an internal fixed frequency chart, or selecting the effective frequency chart associated with the unit symbol bit number which is in accordance with a predetermined condition from the unit symbol bit numbers as the internal fixed frequency chart. The details and variations of this step can be derived or derived from the description of the embodiments of the apparatus.
As mentioned above, the present embodiment may further include the following steps: judging whether the number of effective signal frequency graphs meets a preset number or not; if the number of the effective signal frequency graphs meets the preset number, taking a preset signal frequency graph as the default signal frequency graph or taking a unique signal frequency graph as the default signal frequency graph; and if the number of the effective frequency map is not greater than the predetermined number, performing step S610 to step S630. Details and variations may be learned or derived from the description of embodiments of the apparatus set forth above.
Since the detailed implementation and the variations of the present invention can be understood by those skilled in the art with reference to the disclosure of the present invention, that is, the technical features of the present invention can be reasonably applied to the present invention, the repeated and redundant description is omitted herein without affecting the disclosure requirement and the feasibility of the present invention.
In addition to the above-mentioned apparatus and method, the present invention also provides a system for selecting a frequency map, and one embodiment of the system is shown in fig. 7. As shown in fig. 7, the frequency map selection system 700 comprises: a receiving circuit 710; and a transmitting circuit 720. The receiving circuit 710 is used for receiving data of a connection end, and includes: an audio map selecting device 712, such as the audio map selecting device 100 of fig. 1 or its equivalent, is used to determine whether a new audio map condition (e.g., the first condition or the like in the aforementioned embodiment) or an invalid audio map condition (e.g., the second condition or the like in the aforementioned embodiment) is satisfied according to the data of the connection end, and select an intra-pilot audio map according to the number of unit symbol bits of a plurality of valid audio maps when the new audio map condition or the invalid audio map condition is satisfied. The transmission circuit 720 is, for example, a transmission circuit designed by a person skilled in the art or an implementer as required for transmitting the information of the default pilot pattern to the connection terminal.
As mentioned above, when the new signal-frequency diagram condition or the invalid signal-frequency diagram condition is satisfied, and the signal-frequency diagram selecting device 712 determines that the number of the valid signal-frequency diagrams satisfies a predetermined number according to the data of the connection end, the signal-frequency diagram selecting device 712 uses a predetermined signal-frequency diagram as the default signal-frequency diagram, or uses a unique signal-frequency diagram as the default signal-frequency diagram. Details and variations may be learned or derived from the description of embodiments of the apparatus set forth above.
In summary, the apparatus, method and system for selecting a channel map according to the present invention can flexibly determine the default channel map to reflect the channel status in consideration of the situation of each transmission interval, thereby improving the data throughput.
Although the embodiments of the present invention have been described above, these embodiments are not intended to limit the present invention, and those skilled in the art can make variations on the technical features of the present invention according to the explicit or implicit contents of the present invention, and all such variations may fall within the scope of the patent protection sought by the present invention.
Claims (12)
1. A signal-frequency diagram selection device, comprising:
a unit symbol bit number providing circuit for providing a plurality of unit symbol bit numbers, wherein each unit symbol bit number is associated with a frequency map;
a calculation circuit for performing a specific operation on the plurality of unit symbol bits to generate a calculation result; and
a selection circuit for finding out a predetermined relationship with the calculated result from the plurality of unit symbol bit numbers, so as to use the frequency map associated with the unit symbol bit number in accordance with the predetermined relationship as an default frequency map.
2. The apparatus of claim 1, wherein the selection circuit is configured to use the frequency map associated with the unit symbol bit number closest to or closest to and not greater than the calculation result as the default frequency map.
3. The apparatus of claim 1, further comprising:
a control circuit for making the calculation circuit apply a first weighting calculation to the unit symbol bit numbers when a first condition is satisfied, and for making the calculation circuit apply a second weighting calculation to the unit symbol bit numbers when a second condition is satisfied, thereby generating the calculation result, wherein the first weighting calculation is different from the second weighting calculation.
4. The apparatus of claim 3, wherein the first condition comprises a plurality of frequency maps including at least one new frequency map, and the second condition comprises the plurality of frequency maps including at least one invalid frequency map.
5. The apparatus of claim 1, further comprising:
a control circuit for making the selection circuit to use the signal frequency diagram associated with the unit symbol bit number conforming to the predetermined relationship as the internal fixed signal frequency diagram when the calculation result is greater than a threshold value; and when the calculation result is smaller than the threshold value, the selection circuit is enabled to use the signal frequency diagram associated with one of the unit symbol bit numbers meeting a predetermined condition as the default signal frequency diagram.
6. The apparatus of claim 1, further comprising:
a control circuit for performing the steps of:
judging whether the number of effective signal frequency graphs meets a preset number or not;
if the control circuit determines that the number of the effective signal frequency patterns satisfies the predetermined number, a predetermined signal frequency pattern is used as the default signal frequency pattern, or a unique signal frequency pattern is used as the default signal frequency pattern.
7. A method for selecting a frequency map is applied to a signal receiving end of a power line communication system, and comprises the following steps:
obtaining a plurality of unit symbol bit numbers, wherein each unit symbol bit number is associated with a frequency map;
performing a specific operation on the plurality of unit symbol bits to generate a calculation result; and
finding out the relation of the calculation result and the unit symbol bit number which is in accordance with a predetermined relation from the plurality of unit symbol bit numbers, thereby selecting the frequency map associated with the unit symbol bit number which is in accordance with the predetermined relation as a default frequency map.
8. The method of claim 7, wherein the step of selecting the inner pilot pattern comprises: selecting the frequency map associated with the unit symbol bit number closest or closest to and not greater than the calculation result as the default frequency map.
9. The method of claim 7, further comprising:
applying a first weighting calculation to the plurality of unit symbol bits when a first condition is satisfied, thereby generating the calculation result; and
applying a second weighting calculation to the unit symbol bits when a second condition is satisfied, thereby generating the calculation result,
wherein the first weighting calculation is different from the second weighting calculation.
10. The method of claim 9, wherein the first condition comprises the plurality of frequency maps including at least one new frequency map, and the second condition comprises the plurality of frequency maps including at least one invalid frequency map.
11. The method of claim 7, further comprising:
when the calculation result is larger than a threshold value, selecting the frequency map associated with the unit symbol bit number in accordance with the predetermined relationship as the default frequency map; and
when the calculation result is smaller than the threshold value, the signal frequency diagram associated with one of the unit symbol bit numbers meeting a predetermined condition is selected as the default signal frequency diagram.
12. The method of claim 7, further comprising:
judging whether the number of effective signal frequency graphs meets a preset number or not;
if the number of the effective signal frequency graphs meets the preset number, taking a preset signal frequency graph as the default signal frequency graph or taking a unique signal frequency graph as the default signal frequency graph; and
if the number of valid tone maps is not greater than the predetermined number, performing the steps recited in claim 7.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1830189A (en) * | 2003-07-25 | 2006-09-06 | 松下电器产业株式会社 | Apparatus and method for multicarrier transmission/reception with transmission quality evaluation |
| CN101273550A (en) * | 2005-07-27 | 2008-09-24 | 科内森特系统公司 | Managing spectra of modulated signals in a communication network |
| CN102480459A (en) * | 2010-11-25 | 2012-05-30 | 雷凌科技股份有限公司 | Method and communication apparatus determining video configuration |
| CN105191202A (en) * | 2013-03-13 | 2015-12-23 | 高通股份有限公司 | Adjusting multi-carrier modulation and transmission power properties |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7664955B2 (en) * | 2006-03-07 | 2010-02-16 | Atheros Communications, Inc. | Establishing shared information in a network |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1830189A (en) * | 2003-07-25 | 2006-09-06 | 松下电器产业株式会社 | Apparatus and method for multicarrier transmission/reception with transmission quality evaluation |
| CN101273550A (en) * | 2005-07-27 | 2008-09-24 | 科内森特系统公司 | Managing spectra of modulated signals in a communication network |
| CN102480459A (en) * | 2010-11-25 | 2012-05-30 | 雷凌科技股份有限公司 | Method and communication apparatus determining video configuration |
| CN105191202A (en) * | 2013-03-13 | 2015-12-23 | 高通股份有限公司 | Adjusting multi-carrier modulation and transmission power properties |
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