CN109951199B - Receiving apparatus - Google Patents
Receiving apparatus Download PDFInfo
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- CN109951199B CN109951199B CN201711396709.8A CN201711396709A CN109951199B CN 109951199 B CN109951199 B CN 109951199B CN 201711396709 A CN201711396709 A CN 201711396709A CN 109951199 B CN109951199 B CN 109951199B
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Abstract
A receiving device comprises a first receiving circuit, a second receiving circuit and a first comparing circuit, wherein the first receiving circuit is used for receiving a plurality of signals and comparing a plurality of signal powers of the signals with a first critical value to generate a plurality of comparison results; a second receiving circuit for receiving the plurality of signals and comparing the plurality of signal powers of the plurality of signals with a second threshold to generate a second plurality of comparison results, wherein the first threshold is smaller than the second threshold; and a control circuit, coupled to the first receiving circuit and the second receiving circuit, for determining whether an average signal power of the plurality of signals is greater than a reference power according to the first plurality of comparison results and the second plurality of comparison results to generate a determination result.
Description
Technical Field
The present invention relates to an apparatus and method for a communication system, and more particularly, to an apparatus and method for detecting signal power.
Background
In communication systems, the detection of signal power is a paramount issue. However, the signal types are various, and may have different modulation modes or have a high Peak to Average Power Ratio (PAPR). In this case, the signal power varies rapidly and greatly, making it difficult for the receiving end to accurately detect the signal power.
Therefore, how to accurately detect the signal power becomes an urgent problem to be solved.
Disclosure of Invention
Therefore, the present invention provides a receiving apparatus and a receiving method for detecting signal power to solve the above-mentioned problems.
The invention discloses a receiving device, which comprises a first receiving circuit, a second receiving circuit and a third receiving circuit, wherein the first receiving circuit is used for receiving a plurality of signals and comparing a plurality of signal powers of the signals with a first critical value (threshold) to generate a plurality of first comparison results; a second receiving circuit for receiving the plurality of signals and comparing the plurality of signal powers of the plurality of signals with a second threshold to generate a second plurality of comparison results, wherein the first threshold is smaller than the second threshold; and a control circuit, coupled to the first receiving circuit and the second receiving circuit, for determining whether an average signal power of the plurality of signals is greater than a reference power according to the first plurality of comparison results and the second plurality of comparison results to generate a determination result.
Drawings
Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a receiving device according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a control circuit according to an embodiment of the invention.
Fig. 4 is a schematic diagram illustrating detection of signal powers of a plurality of signals according to an embodiment of the invention.
FIG. 5 is a flow chart of an embodiment of the present invention.
Detailed Description
Fig. 1 is a diagram of a communication system 10 according to an embodiment of the invention. The communication system 10 may be any communication system using Orthogonal Frequency Division Multiplexing (OFDM) technology (or DMT technology), and is briefly composed of a transmitting end TX and a receiving end RX. In fig. 1, a transmitting end TX and a receiving end RX are used to illustrate the architecture of the communication system 10. For example, the communication system 10 may be a wired communication system such as an Asymmetric Digital Subscriber Line (ADSL) system, a Power Line Communication (PLC) system, an Ethernet Over Coax (EOC) system, or a wireless communication system such as a Wireless Local Area Network (WLAN), a Digital Video Broadcasting (DVB) system, a Long Term Evolution (LTE) system, and a Long Term Evolution-advanced (LTE-advanced) system. In addition, the transmitting terminal TX and the receiving terminal RX may be disposed in a mobile phone, a notebook computer, etc., but are not limited thereto.
Fig. 2 is a schematic diagram of a receiving apparatus 20 according to an embodiment of the present invention, which is used in the receiving end RX of fig. 1 for detecting (e.g., determining) signal power. The receiving device 20 includes a first receiving circuit 200, a second receiving circuit 202 and a control circuit 210. In detail, the first receiving circuit 200 receives a plurality of signals sig _ rx, and compares a plurality of signal powers of the plurality of signals sig _ rx with a first threshold (threshold) TH1 to generate a first plurality of comparison results comp _ rst 1. The first receiving circuit 202 receives the plurality of signals sig _ rx and compares a plurality of signal powers of the plurality of signals sig _ rx with a second threshold TH2 to generate a second plurality of comparison results comp _ rst 2. The control circuit 210 is coupled to the first receiving circuit 200 and the second receiving circuit 202, and is configured to determine whether the average signal power of the signals sig _ rx is greater than a reference power according to the first comparison result comp _ rst1 and the second comparison result comp _ rst2 to generate a determination result det _ rst. For example, if the average signal power is greater than the reference power, the determination result det _ rst is bit "1"; otherwise, the determination result det _ rst is bit "0".
That is, the signals sig _ rx may have different modulation modes or have a high Peak to Average Power Ratio (PAPR), which causes a rapid and large variation of the signal Power, making it difficult for the receiving end to correctly detect the signal powers of the signals sig _ rx. According to the present invention, by using two threshold values to generate the comparison result, the influence of the modulation scheme and the peak-to-average power ratio on the comparison result can be reduced, and the receiving apparatus 20 can correctly detect the signal powers of the plurality of signals sig _ rx. In other words, by using two threshold values, the uncertainty of the signal characteristics on the detected signal power can be compensated.
Fig. 3 is a schematic diagram of a control circuit 30 according to an embodiment of the invention, which can be used to implement the control circuit 210 of fig. 2. The control circuit 30 includes a counting circuit 300 and a determining circuit 302. In detail, the counting circuit 300 is coupled to the first receiving circuit 200 and the second receiving circuit 202, and is configured to generate a first number num1 according to the first comparison result comp _ rst1, and generate a second number num2 according to the second comparison result comp _ rst2, wherein a signal power of num1 of the plurality of signals sig _ rx is greater than the first threshold TH1, and a signal power of num2 of the plurality of signals sig _ rx is greater than the second threshold TH 2. The determining circuit 302 is coupled to the counting circuit 300 for generating the determining result det _ rst. If the second number num2 is greater than a product of the first number num1 and a constant (the constant is a real number between 0 and 1), the determination result det _ rst indicates that the average signal power of the signals sig _ rx is greater than the reference power. If the second number num2 is not greater than the product, the determination result det _ rst indicates that the average signal power of the plurality of signals sig _ rx is not greater than the reference power. That is, the determining circuit 302 compares the number of signals with the signal power greater than the first threshold TH1 with the number of signals with the signal power greater than the second threshold TH2 to determine whether the average signal power of the signals sig _ rx is greater than the reference power.
In an embodiment, the determining circuit 302 can be implemented by a polynomial to improve the accuracy of the determination. For example: if the second number num2 is greater than the first number num1 of polynomials (a)n(num1)n+an-1(num1)n-1+…+a1(num1)+a0Wherein the coefficient an、an-1、…、a1A real number between 0 and 1, and a coefficient a0Which may be any value), the determination result det _ rst indicates that the average signal power of the plurality of signals sig _ rx is greater than the reference power. If the second number num2 is not greater than the polynomial, the determination result det _ rst indicates that the average signal power of the signals sig _ rx is not greater than the reference power.
In one embodiment, the constant and the coefficient in the polynomial are related to system parameters such as reference power, for example, the constant and the coefficient can be obtained through simulation or experiment, but not limited thereto. In one embodiment, the plurality of signals sig _ rx are a plurality of ofdm signals. In one embodiment, the first threshold TH1 and the second threshold TH2 are related to system parameters such as reference power. In one embodiment, the first receiving circuit 200 and the second receiving circuit 202 receive a plurality of signals sig _ rx during a time interval.
Fig. 4 is a schematic diagram illustrating detection of signal powers of a plurality of signals according to an embodiment of the invention. After receiving the plurality of signals sig _ rx in the time interval T, the receiving apparatus 20 compares the signal powers of the plurality of signals sig _ rx with the first threshold TH1 and the first threshold TH2, respectively. In detail, when the first comparison results comp _ rst1 are generated, if the signal power is greater than the first threshold TH1, the receiving device 20 outputs a bit "1"; conversely, the receiving device 20 outputs the bit "0". When the second plurality of comparison results comp _ rst2 are generated, if the signal power is greater than the second threshold TH2, the receiver 20 outputs a bit "0"; conversely, the receiving device 20 outputs the bit "0". Then, the communication device 20 calculates the amount of signal power greater than the first threshold value TH1 to be 13, and calculates the amount of signal power greater than the second threshold value TH2 to be 4.
In one embodiment, assuming a constant of 0.4, the communication device 20 may obtain: . Therefore, the communication device 20 generates a determination result indicating that the average power of the plurality of signals sig _ rx is smaller than the reference power. In another embodiment, assuming a constant of 0.2, the communication device 20 may obtain: . Therefore, the communication device 20 generates a determination result indicating that the average power of the plurality of signals sig _ rx is greater than the reference power. As mentioned above, the design of the constants can be related to system parameters such as reference power, and will not be described herein.
In one embodiment, assume a polynomial of a2132+a113+a0. If the communication device 20 determines 4<a2132+a113+a0The communication device 20 generates a determination result indicating that the average power of the plurality of signals sig _ rx is less than the reference power. In another embodiment, if the communication device 20 determines 4>a2132+a113+a0The communication device 20 generates a determination result indicating that the average power of the plurality of signals sig _ rx is greater than the reference power. As mentioned above, the design of the constants can be related to system parameters such as reference power, and will not be described herein.
Fig. 5 is a flowchart of a process 50 according to an embodiment of the present invention, for describing the operation of the receiving apparatus 20, which includes the following steps:
step 500: and starting.
Step 502: the method comprises the steps of receiving a plurality of signals, and comparing a plurality of signal powers of the plurality of signals with a first threshold value to generate a first plurality of comparison results.
Step 504: the method comprises receiving the plurality of signals, and comparing the plurality of signal powers of the plurality of signals with a second threshold to generate a second plurality of comparison results, wherein the first threshold is smaller than the second threshold.
Step 506: and judging whether the average signal power of the signals is greater than a reference power according to the first plurality of comparison results and the second plurality of comparison results to generate a judgment result.
Step 508: and (6) ending.
It is noted that the first receiving circuit 200, the second receiving circuit 202 and the control circuit 210 may be integrated into one or more circuits according to design considerations or system requirements. In addition, the receiving device 20 and the circuit thereof can be implemented by hardware, software, firmware, electronic system, or a combination thereof, but is not limited thereto. In the implementation of the receiving apparatus 20, the signal power can be represented as a voltage for the circuit to process.
In summary, the present invention provides an apparatus and a control method thereof, which can reduce the influence of the modulation scheme and the peak-to-average power ratio by using two threshold values to generate the comparison result, so that the receiving apparatus can correctly detect the signal powers of a plurality of signals. In addition, the present invention can avoid the delay caused by solving similar problems in the prior art.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Description of the symbols
10 communication system
20 receiving device
200. 202 receiving circuit
210. 30 control circuit
300 counting circuit
302 judging circuit
50 flow path
500. 502, 504, 506, 508
comp _ rst1 and comp _ rst2 comparison results
det _ rst judgment result
num1, num2
sig _ rx signal
T time interval
Threshold values TH1, TH2
TX transmitting terminal
And RX receiving end.
Claims (7)
1. A receiving device, comprising:
a first receiving circuit for receiving a plurality of signals and comparing a plurality of signal powers of the plurality of signals with a first threshold value to generate a first plurality of comparison results;
a second receiving circuit for receiving the plurality of signals and comparing the plurality of signal powers of the plurality of signals with a second threshold to generate a second plurality of comparison results, wherein the first threshold is smaller than the second threshold; and
a control circuit, coupled to the first receiving circuit and the second receiving circuit, for determining whether an average signal power of the plurality of signals is greater than a reference power according to the first plurality of comparison results and the second plurality of comparison results to generate a determination result,
wherein the control circuit comprises:
a counting circuit coupled to the first receiving circuit and the second receiving circuit for generating a first number according to the first plurality of comparison results and a second number according to the second plurality of comparison results, wherein the signal power of the first number of the plurality of signals is greater than the first threshold, the signal power of the second number of the plurality of signals is greater than the second threshold, and
a decision circuit, coupled to the counting circuit, for generating the decision result, wherein the decision result indicates that the average signal power of the plurality of signals is greater than the reference power if the second number is greater than a product of the first number and a constant, and indicates that the average signal power of the plurality of signals is not greater than the reference power if the second number is not greater than the product.
2. The receiving device as recited in claim 1 wherein the constant is related to the reference power.
3. The receiving device of claim 1, wherein the plurality of signals are a plurality of orthogonal frequency division multiplexed signals.
4. The receiving device as claimed in claim 1, wherein the first threshold and the second threshold are related to the reference power.
5. The receiving device as claimed in claim 1, wherein the first receiving circuit and the second receiving circuit receive the plurality of signals during a time interval.
6. A receiving device, comprising:
a first receiving circuit for receiving a plurality of signals and comparing a plurality of signal powers of the plurality of signals with a first threshold value to generate a first plurality of comparison results;
a second receiving circuit for receiving the plurality of signals and comparing the plurality of signal powers of the plurality of signals with a second threshold to generate a second plurality of comparison results, wherein the first threshold is smaller than the second threshold; and
a control circuit, coupled to the first receiving circuit and the second receiving circuit, for determining whether an average signal power of the plurality of signals is greater than a reference power according to the first plurality of comparison results and the second plurality of comparison results to generate a determination result,
wherein the control circuit comprises:
a counting circuit coupled to the first receiving circuit and the second receiving circuit for generating a first number according to the first plurality of comparison results and a second number according to the second plurality of comparison results, wherein the signal power of the first number of the plurality of signals is greater than the first threshold, the signal power of the second number of the plurality of signals is greater than the second threshold, and
a determining circuit, coupled to the counting circuit, for generating the determination result, wherein if the second number is greater than a polynomial of the first number, at least one coefficient of the polynomial being a real number between 0 and 1, the determination result indicates that the average signal power of the plurality of signals is greater than the reference power, and if the second number is not greater than the polynomial, the determination result indicates that the average signal power of the plurality of signals is not greater than the reference power.
7. The receiving device of claim 6, wherein the at least one coefficient is related to the reference power.
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| CN201711396709.8A CN109951199B (en) | 2017-12-21 | 2017-12-21 | Receiving apparatus |
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| CN201711396709.8A CN109951199B (en) | 2017-12-21 | 2017-12-21 | Receiving apparatus |
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| CN109951199B true CN109951199B (en) | 2021-02-05 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1595818A (en) * | 2003-09-10 | 2005-03-16 | 日本电气株式会社 | Synchronization judging circuit capable of operating moderately |
| CN101577798A (en) * | 2008-05-09 | 2009-11-11 | 联咏科技股份有限公司 | Method and relevant device for controlling audio data source of multimedia device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2015154306A (en) * | 2014-02-17 | 2015-08-24 | ソニー株式会社 | Automatic gain controller, automatic gain control method, and receiver |
| US20160378168A1 (en) * | 2015-06-26 | 2016-12-29 | Advanced Micro Devices, Inc. | Dynamic power management optimization |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1595818A (en) * | 2003-09-10 | 2005-03-16 | 日本电气株式会社 | Synchronization judging circuit capable of operating moderately |
| CN101577798A (en) * | 2008-05-09 | 2009-11-11 | 联咏科技股份有限公司 | Method and relevant device for controlling audio data source of multimedia device |
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