CN108124181B - Transmission circuit and related signal transmission method - Google Patents
Transmission circuit and related signal transmission method Download PDFInfo
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- CN108124181B CN108124181B CN201611074787.1A CN201611074787A CN108124181B CN 108124181 B CN108124181 B CN 108124181B CN 201611074787 A CN201611074787 A CN 201611074787A CN 108124181 B CN108124181 B CN 108124181B
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- signal
- circuit
- gain
- gain value
- electronic device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
- H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a transmission circuit, which is arranged in an electronic device, wherein the electronic device carries out signal transmission with another electronic device through a coaxial cable Ethernet system, and the transmission circuit comprises a control circuit, a gain adjusting circuit and an output circuit. The control circuit is used for obtaining a carrier modulation mode mapping chart from the other electronic device, calculating a signal quality parameter according to the carrier modulation mode mapping chart and determining a gain value according to the signal quality parameter; the gain adjusting circuit is coupled with the control circuit and used for adjusting the intensity of a signal according to the gain value and generating an adjusted analog signal; and the output circuit is coupled to the gain adjusting circuit and is used for transmitting the adjusted signal to the other electronic device.
Description
Technical Field
The present invention relates to a transmitter, and more particularly, to a transmitter and a signal transmission method thereof for use in an Ethernet over coax (EoC) system.
Background
In the current transmitter applied to the coaxial cable ethernet system, considering the linear operation area of the driving circuit, and if the transmitter employs some specific Signal modulation, there is a high requirement for the Signal-to-Noise Ratio (SNR) of the Signal, therefore, the gain of the transmitter is a fixed value to avoid the SNR from being degraded due to the gain increase of the transmitter. However, this way the operation of the conveyor is not resilient and its throughput cannot be optimized.
Disclosure of Invention
Therefore, an objective of the present invention is to provide a transmitter, the gain of which can be dynamically adjusted according to the channel quality status, so that the transmitter can have a suitable throughput through proper setting under different channel quality statuses to solve the problems in the prior art.
In an embodiment of the present invention, a transmitting circuit disposed in an electronic device for signal transmission with another electronic device via a coaxial cable ethernet system is disclosed, and the transmitting circuit includes a control circuit, a gain adjustment circuit and an output circuit. The control circuit is used for obtaining a carrier modulation mode mapping chart from the other electronic device, calculating a signal quality parameter according to the carrier modulation mode mapping chart and determining a gain value according to the signal quality parameter; the gain adjusting circuit is coupled with the control circuit and used for adjusting the intensity of a signal according to the gain value and generating an adjusted analog signal; and the output circuit is coupled to the gain adjusting circuit and is used for transmitting the adjusted signal to the other electronic device.
In another embodiment of the present invention, a signal transmission method is disclosed, which is applied in an electronic device, the electronic device performs signal transmission with another electronic device through a coaxial ethernet system, and the signal transmission method includes: obtaining a carrier modulation mode map from the other electronic device; calculating a signal quality parameter according to the carrier modulation mode mapping chart; determining a gain value according to the signal quality parameter; adjusting the intensity of a signal according to the gain value and generating an adjusted signal; and transmitting the adjusted signal to the other electronic device.
In another embodiment of the present invention, a set-top box for television signal transmission with another electronic device via a coaxial cable ethernet system is disclosed, which includes a decapsulation circuit, a determination circuit, a control circuit, a gain adjustment circuit, and an output circuit. The decapsulation circuit is used for decapsulating a packet transmitted by the other electronic device to obtain a carrier modulation mode map; the judging circuit calculates a signal quality parameter according to the carrier modulation mode mapping chart; the control circuit determines a gain value according to the signal quality parameter; the gain adjusting circuit adjusts the intensity of a signal according to the gain value and generates an adjusted signal; and the output circuit is used for transmitting the adjusted signal to the other electronic device, wherein the signal is generated according to the carrier modulation mode mapping chart.
Drawings
Fig. 1 is a block diagram of a coaxial cable ethernet system.
FIG. 2 is a block diagram of a transmitting circuit according to an embodiment of the invention.
FIG. 3 is a timing diagram illustrating adjusting the gain of a transmitting circuit according to a signal mapping index according to an embodiment of the invention.
Fig. 4 is a flowchart of a signaling method according to an embodiment of the invention.
Description of the symbols
100 coaxial cable Ethernet system
110 TV set-top box
120 master device
130 cable
140 television
112. 122, 200 transmission circuit
114. 124 receiving circuit
116. 126 processing circuit
202 data conversion circuit
204 memory
210 digital gain adjustment circuit
220D/A converter
230 analog gain adjustment circuit
240 output circuit
250 control circuit
260 reference table
270 decapsulation circuit
280 judging circuit
Detailed Description
Referring to fig. 1, a block diagram of an ethernet over coax (EoC) system 100 is shown. In fig. 1, the ethernet over coax system 100 comprises a tv set-top box 110 and a host device 120, wherein the tv set-top box 110 and the host device 120 transmit video and audio signals and digital data via a cable 130. The tv set-top box 110 not only can transmit the video signal transmitted from the main device 120 to a display for playing, but also can transmit the digital data transmitted from the main device 120 to a computer device for processing, so as to transmit the digital data transmitted from the computer device to the main device 120. In the embodiment, a smart tv 140 includes the display and the computer device, but the invention is not limited thereto, and in other embodiments, the display and the computer device may be different devices. In the embodiment shown in fig. 1, the tv set-top box 110 includes a transmitting circuit 112, a receiving circuit 114 and a processing circuit 116 for processing, transmitting and receiving data, and the master device 120 includes a transmitting circuit 122, a receiving circuit 124 and a processing circuit 126 for processing, transmitting and receiving data.
Next, please refer to fig. 2, which is a block diagram of a transmitting circuit 200 according to an embodiment of the present invention. As shown in fig. 2, the transmitting circuit 200 includes a data converting circuit 202, a digital gain adjusting circuit 210, a digital-to-analog converter 220, an analog gain adjusting circuit 230, an output circuit 240, a control circuit 250, and a look-up table 260, wherein the transmitting circuit 200 is further coupled to a memory 204, a decapsulation circuit 270, and a determining circuit 280. In the present embodiment, the analog gain adjustment circuit 230 may be an analog front-end circuit module including an amplification circuit, the output circuit 240 may include a low noise amplifier and related driving circuits, the transmission circuits 112 and 122 shown in fig. 1 may be implemented by using the transmission circuit 200, the determination circuit 280 may be disposed in the processing circuits 116 and 126, and the decapsulation circuit 270 may be disposed in the receiving circuits 114 and 124.
The look-up table 260 shown in fig. 2 stores gain values corresponding to different signal quality parameters, more specifically, the signal quality parameters are used to indicate the signal quality of a signal transmitted through a transmission channel (e.g., the cable 130), such as the signal attenuation degree is high or low, and the look-up table 260 stores a first gain value Vc1 and a second gain value Vc2 corresponding to different signal quality parameters, wherein the first gain value Vc1 is used by the analog gain adjustment circuit 230, and the second gain value Vc2 is used by the digital gain adjustment circuit 210.
In operation of the transmitter 200, first, the decapsulation circuit 270 receives a packet and decapsulates the packet to obtain a modulation mode map (tone map) and transmits the same to the determining circuit 280 and the memory 204, and in particular, the data format (data format) of the packet includes a header portion and a data portion, wherein the header portion includes a plurality of repeated sequences and frame information, such as a start position of the data portion, and the data portion may be data or the modulation mode map, and when the decapsulation circuit 270 determines that the data portion is the modulation mode map according to the header portion, the modulation mode map is transmitted to the determining circuit 280 and the memory 204. The determining circuit 280 determines a signal quality parameter according to the received carrier modulation mode map, and in particular, in an ethernet over coax (EoC) system, the carrier modulation mode map records modulation modes corresponding to different signal components (e.g., carriers) according to different numbers of bits, such as N bits for the 1 st signal component, M bits for the 2 nd signal component …, etc., and the determining circuit 280 may calculate an average number of bits of all the signal components as the signal quality parameter, but this is not a limitation of the present invention. Next, the control circuit 250 determines a first gain value Vc1 and a second gain value Vc2 required by the analog gain adjusting circuit 230 and the digital gain adjusting circuit 210 according to the signal quality parameter and the look-up table 260. The data conversion circuit 202 performs data format conversion on the data to be output according to the carrier modulation mode map stored in the memory 204 to generate a digital signal Din. The digital gain adjustment circuit 210 adjusts the intensity of the digital signal Din according to the second gain value Vc2 to generate an adjusted digital signal Din'. The digital-to-analog converter 220 performs a digital-to-analog conversion operation on the adjusted digital signal Din' to generate an analog signal Vin. The analog gain adjustment circuit 230 adjusts the intensity of the analog signal Vin according to the first gain value Vc1 to generate an adjusted analog signal Vin'. The output circuit 240 processes the adjusted analog signal Vin' and transmits the processed analog signal through the cable 230.
In the present embodiment, when the signal quality parameter indicates that the signal transmission quality is better, the control circuit 250 generates the first gain value Vc1 and the second gain value Vc2 such that a sum of gains of the analog gain adjustment circuit 230 and the digital gain adjustment circuit 210 is lower; conversely, when the signal quality parameter indicates poor signal transmission quality, the control circuit 250 generates the first gain value Vc1 and the second gain value Vc2 such that a sum of gains of the analog gain adjustment circuit 230 and the digital gain adjustment circuit 210 is higher.
In the present embodiment, the data conversion circuit 202 may further adopt different digital signal Modulation schemes according to different channel conditions (e.g., channel quality parameters), such as adopting a 4096-Quadrature Amplitude Modulation (4096-QAM) when the channel attenuation is less, or adopting a QPSK (Quadrature Phase Shift Keying) when the channel attenuation is more. However, since the use of the ultra-qam requires an environment with better signal transmission quality (e.g., higher signal-to-noise ratio), the control circuit 250 controls the analog gain adjustment circuit 230 and the digital gain adjustment circuit 210 to have a lower gain sum so as to avoid affecting the snr by exceeding a linear operating range of the transmitting circuit 200. On the other hand, since the modulation method using quadrature phase shift keying does not require a good signal transmission quality environment, the control circuit 250 controls the analog gain adjustment circuit 230 and the digital gain adjustment circuit 210 to have a higher gain sum, so as to increase the throughput of the transmission circuit 200, even if the linear operation range of the transmission circuit 200 is exceeded to sacrifice the signal transmission quality. As described above, since the gain of the transmitting circuit 200 can be dynamically adjusted according to the channel quality status, the transmitting circuit 200 can have the most suitable and flexible setting under different channel quality statuses, so as to solve the problems in the prior art.
In an embodiment of the present invention, the digital gain adjusting circuit 210 can only adjust or not adjust the strength of the digital signal Din according To the second gain value Vc2, i.e. the second gain value is less than or equal To 1, because of the Peak To Average Power Ratio (PAPR) of the output signal Vout of the transmitting circuit 200 and the number of bits that can be processed by the digital-To-analog converter 220. To match Vc1, the first gain value must be greater than or equal to 1, so that the total gain is a positive value. In addition, in an embodiment, the gain adjustment amounts of the analog gain adjustment circuit 230 and the digital gain adjustment circuit 210 may be different so that the gain adjustment of the whole transmission circuit 200 may have higher accuracy, for example, the gain adjustment amount of the analog gain adjustment circuit 230 may be in a unit of 3 decibels (dB), and the gain adjustment amount of the digital gain adjustment circuit 210 may be in a unit of (-2) dB so that the accuracy of the gain adjustment of the whole transmission circuit 200 is 1 dB.
In the embodiment shown in fig. 2, the control circuit 250 determines the gain values used in the analog gain adjusting circuit 230 and the digital gain adjusting circuit 210 according to the signal quality parameter, which is not intended to limit the invention. In other embodiments of the present invention, the control circuit 250 can determine one of the first gain value Vc1 and the second gain value Vc2 according to the signal quality parameter only, that is, the gain of only one of the analog gain adjusting circuit 230 and the digital gain adjusting circuit 210 will change dynamically according to the signal quality parameter, and these design changes are within the scope of the present invention.
Please refer to fig. 3, which is a timing diagram illustrating the adjustment of the gain of the transmitting circuit 200 according to the signal quality parameter according to an embodiment of the present invention, wherein it is assumed in fig. 3 that the set-top box 110 serves as the transmitting end and the host device 120 serves as the receiving end. As shown in fig. 3, first, the set-top box 110 transmits a packet (e.g., a training packet) with a known sequence to the master device 120, and the master device 120 then performs channel estimation on the received packet to determine a carrier modulation mode map (e.g., a carrier modulation mode map with a carrier modulation mode index (TMI) of 4) and transmits the packet to the set-top box 110. The decapsulation circuit 270 of the tv set-top box 110 receives the packet from the host device 120, obtains the carrier modulation mode map (TMI ═ 4) from the received packet, and stores the map in the memory 204. The determining circuit 280 calculates the average bit number of all signal components as a signal quality parameter by using the bit numbers corresponding to a plurality of different signal components included in the carrier modulation mode map. Then, the control circuit 250 dynamically determines a transmission power (i.e., determines the first gain value Vc1 and/or the second gain value Vc2) according to the signal quality parameter, so as to transmit data to the master device 120 using the transmission power TX _ POW ═ x'. The transmit power TX _ POW is the overall gain sum. In addition, the data to be transmitted is obtained by converting the data to be transmitted by the data conversion circuit 202 according to the carrier modulation mode map (TMI ═ 4) in the memory 204.
After receiving the data transmitted by the tv set-top box 110, the host device 120 performs channel estimation on the received data again, and if the received signal quality is not good, for example, the snr of the received signal is lower than a threshold, the host device 120 sends a request to the tv set-top box 110 to request channel estimation again. After receiving the request for re-evaluating the channel, the tv set-top box 110 similarly transmits a packet with a known sequence to the master device 120 again, and the master device 120 then performs channel evaluation again on the received packet to determine a carrier modulation mode map (e.g., TMI 5) and transmits the carrier modulation mode map to the tv set-top box 110 in a packet manner, and the tv set-top box 110 stores the carrier modulation mode map (TMI 5) in the packet into the memory 204 and obtains an updated channel quality parameter according to the channel map. Then, the set-top box 110 dynamically determines an updated transmission power according to the updated channel quality parameter, so as to transmit data to the master device 120 using the transmission power TX _ POW ═ y ". In addition, the data to be transmitted is converted by the data conversion circuit 202 according to the channel map (TMI ═ 5) in the memory 204.
Please refer to fig. 4, which is a flowchart illustrating a signaling method according to an embodiment of the invention. Referring to the disclosure of the above embodiments, the process of fig. 4 is as follows:
step 400: the process begins.
Step 402: a signal quality parameter is obtained from another electronic device, and a gain value is determined according to the signal quality parameter.
Step 404: adjusting the intensity of a signal according to the gain value and generating an adjusted signal.
Step 406: and transmitting the adjusted signal to the other electronic device.
Step 408: the flow ends.
Briefly summarized, in the embodiments of the present invention, since the gain of the transmitter can be dynamically adjusted according to the channel quality status, the gain of the transmitter is reduced when the channel quality is better so that the transmission signal can have better signal-to-noise ratio because the transmission signal operates in the linear working range, and the gain of the transmitter is increased when the channel quality is worse so as to sacrifice the signal-to-noise ratio of the transmission signal in exchange for the throughput. As described above, the transmitter can have the most suitable and flexible settings under different channel quality conditions.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and all equivalent changes and modifications made by the claims of the present invention should be covered by the scope of the present invention.
Claims (11)
1. A transmission circuit is disposed in an electronic device, the electronic device performs signal transmission with another electronic device through a coaxial cable Ethernet system, and the transmission circuit includes:
a control circuit for obtaining a carrier modulation mode map from the other electronic device, calculating a signal quality parameter according to the carrier modulation mode map, and determining a gain value according to the signal quality parameter;
a gain adjusting circuit, coupled to the control circuit, for adjusting the strength of a signal according to the gain value and generating an adjusted signal; and
an output circuit, coupled to the gain adjustment circuit, for transmitting the adjusted signal to the other electronic device, wherein the gain adjustment circuit is an analog gain adjustment circuit, the signal is an analog signal, the gain value is a first gain value, and the control circuit determines a second gain value according to the signal quality parameter;
a digital gain adjusting circuit for adjusting the intensity of a digital signal according to the second gain value and generating an adjusted digital signal; and
and a digital-to-analog converter, coupled to the digital gain adjustment circuit and the analog gain adjustment circuit, for performing digital-to-analog conversion operation on the adjusted digital signal to generate the analog signal.
2. The transmitting circuit of claim 1 wherein the control circuit determines that the first gain value is greater than 1 and the second gain value is less than 1.
3. The transmission circuit of claim 1, wherein the electronic device is a television set-top box.
4. The transmitting circuit of claim 1, wherein the carrier modulation mode map comprises bits corresponding to a plurality of carriers, and the signal quality parameter is calculated according to the bits corresponding to the carriers.
5. The transmitting circuit of claim 4, wherein the signal quality parameter is an average of the number of bits corresponding to the carriers.
6. A signal transmission method is arranged in an electronic device, the electronic device carries out signal transmission with another electronic device through a coaxial cable Ethernet system, and the signal transmission method comprises the following steps:
obtaining a carrier modulation mode map from the other electronic device;
calculating a signal quality parameter according to the carrier modulation mode mapping chart;
determining a gain value according to the signal quality parameter;
adjusting the intensity of a signal according to the gain value and generating an adjusted signal; and
transmitting the adjusted signal to the other electronic device, wherein the signal is an analog signal, and the gain value is a first gain value;
determining a second gain value according to the signal quality parameter;
adjusting the intensity of a digital signal according to the second gain value and generating an adjusted digital signal; and
and performing digital-to-analog conversion operation on the adjusted digital signal to generate the analog signal.
7. The method of claim 6, wherein the first gain value is greater than 1 and the second gain value is less than or equal to 1 according to the signal quality parameter.
8. The method of claim 6, wherein the electronic device is a television set-top box.
9. The method of claim 6, wherein the carrier modulation mode map comprises bits corresponding to a plurality of carriers, and the step of calculating the signal quality parameter according to the carrier modulation mode map comprises:
and calculating the signal quality parameter according to the digits corresponding to the carriers.
10. The method of claim 9, wherein the step of calculating the signal quality parameter according to the bits corresponding to the carriers comprises:
calculating an average value of the bits corresponding to the carriers as the signal quality parameter.
11. A TV set-top box for signal transmission with another electronic device through a coaxial cable Ethernet system, comprising:
a decapsulation circuit for decapsulating a packet transmitted by the other electronic device to obtain a carrier modulation mode map;
a judging circuit, calculating a signal quality parameter according to the carrier modulation mode mapping chart;
a control circuit for determining a gain value according to the signal quality parameter;
a gain adjusting circuit, which adjusts the intensity of a signal according to the gain value and generates an adjusted signal; and
an output circuit for transmitting the adjusted signal to the other electronic device;
wherein the signal is generated according to the carrier modulation mode map,
wherein the gain adjusting circuit is an analog gain adjusting circuit, the signal is an analog signal, the gain value is a first gain value, the control circuit determines a second gain value according to the signal quality parameter,
wherein the TV set-top box further comprises:
a digital gain adjusting circuit for adjusting the intensity of a digital signal according to the second gain value and generating an adjusted digital signal; and
and a digital-to-analog converter, coupled to the digital gain adjustment circuit and the analog gain adjustment circuit, for performing digital-to-analog conversion operation on the adjusted digital signal to generate the analog signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074787.1A CN108124181B (en) | 2016-11-29 | 2016-11-29 | Transmission circuit and related signal transmission method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074787.1A CN108124181B (en) | 2016-11-29 | 2016-11-29 | Transmission circuit and related signal transmission method |
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| Publication Number | Publication Date |
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| CN108124181A CN108124181A (en) | 2018-06-05 |
| CN108124181B true CN108124181B (en) | 2020-06-12 |
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| CN201611074787.1A Expired - Fee Related CN108124181B (en) | 2016-11-29 | 2016-11-29 | Transmission circuit and related signal transmission method |
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| CN1672343A (en) * | 2002-06-20 | 2005-09-21 | 高通股份有限公司 | Adaptive gain adjustment control with feedback |
| EP2270980A1 (en) * | 2009-06-19 | 2011-01-05 | Thomson Licensing | Receiver with analog and digital gain control, and respective method |
| CN101986695A (en) * | 2010-10-26 | 2011-03-16 | 深圳市同洲电子股份有限公司 | Demodulator and set top box as well as method for adjusting gain of set top box |
| CN105357164A (en) * | 2010-09-09 | 2016-02-24 | 南京创达特网络科技有限公司 | Multicarrier receiver, multicarrier transmitter and multicarrier transceiving system |
| US9413423B1 (en) * | 2015-08-18 | 2016-08-09 | Texas Instruments Incorporated | SNR calculation in impulsive noise and erasure channels |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI478489B (en) * | 2007-12-19 | 2015-03-21 | Realtek Semiconductor Corp | Receive device and its auto gain control method |
| US8537705B2 (en) * | 2010-01-04 | 2013-09-17 | Qualcomm Incorporated | Transmit power control |
-
2016
- 2016-11-29 CN CN201611074787.1A patent/CN108124181B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1672343A (en) * | 2002-06-20 | 2005-09-21 | 高通股份有限公司 | Adaptive gain adjustment control with feedback |
| EP2270980A1 (en) * | 2009-06-19 | 2011-01-05 | Thomson Licensing | Receiver with analog and digital gain control, and respective method |
| CN105357164A (en) * | 2010-09-09 | 2016-02-24 | 南京创达特网络科技有限公司 | Multicarrier receiver, multicarrier transmitter and multicarrier transceiving system |
| CN101986695A (en) * | 2010-10-26 | 2011-03-16 | 深圳市同洲电子股份有限公司 | Demodulator and set top box as well as method for adjusting gain of set top box |
| US9413423B1 (en) * | 2015-08-18 | 2016-08-09 | Texas Instruments Incorporated | SNR calculation in impulsive noise and erasure channels |
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