CN102299873A - Physical layer chip in EOC (Ethernet Over Coax) network and realization method thereof - Google Patents
Physical layer chip in EOC (Ethernet Over Coax) network and realization method thereof Download PDFInfo
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Abstract
The invention discloses a physical layer chip in an EOC (Ethernet Over Coax) network. A power spectrum module is used for receiving frame detection and a useful gain-adjusted signal output by an automatic gain control module, and calculating the power spectrum of the signal; a frequency scanning module is used for receiving a baseband signal of one-time symbol rate output by a down-conversion and interpolation module, outputting a center frequency and a symbol rate to an up-conversion and interpolation module, and outputting a center frequency and a symbol rate to the down-conversion and interpolation module; and a balance and noise inhibition module is used for receiving a baseband signal of one-time symbol rate output by the down-conversion and interpolation module, inhibiting the back waves and narrow-band noise in the signal, and outputting a balanced signal to a demodulator. The invention further discloses a method for realizing the chip. The physical layer chip has the function of measuring the network noise in real time, and can be used for effectively inhibiting the invasive noise.
Description
Technical field
The present invention relates to physical chip and its implementation in a kind of EOC (Ethernet Over Coax, coaxial cable Ethernet) network.
Background technology
In the EOC network, a local side apparatus links to each other with a plurality of ustomer premises access equipments by coaxial cable, and local side apparatus wherein all has identical physical chip with ustomer premises access equipment.Physical chip is operated in the half-duplex state, and transmit status, accepting state are arranged, and operating state is controlled by MAC chip (the MAC layer is the last layer of physical layer).
See also Fig. 1, physical chip comprises in the existing EOC network: analog front-end module (analogfront end), modulator (Modultor), frequency up-converted and interpolating module (Up Conversion ﹠amp; Interpolator), frame detects and automatic gain control module (Frame Detected ﹠amp; Automatic gaincontrol), frequency down-converts and interpolating module (Down Conversion ﹠amp; Interpolator), balanced and noise suppression module (Equlizer ﹠amp; Noise Cancel), demodulator (Demodulator).Wherein, AFE (analog front end) is connected with coaxial cable by interface IN, OUT, and modulator is connected with the MAC chip by interface MAX_TX, and demodulator is connected with the MAC chip by interface MAC_RX.
Physical chip shown in Figure 1 is when transmit status, and the MAC layer sends to modulator with the MAC bag by the MAC_TX interface.Modulator is sealed MAC and is contained in the physical frame and carries out randomization and chnnel coding, and the code stream after the chnnel coding generates baseband signal.Frequency up-converted and interpolating module according to the dispatching centre frequency upconversion, then by interpolation filter, generate baseband signal sampled data and send to AFE (analog front end).AFE (analog front end) is amplified the back and is exported to coaxial cable by interface OUT by digital-to-analogue conversion, low-pass filtering.
Physical chip shown in Figure 1 is when accepting state, and the data on the coaxial cable reach AFE (analog front end) by the IN interface.AFE (analog front end) by amplification, filtering, analog-to-digital conversion after the output sampled signal detect and the automatic gain control module to frame.Frame detects with the automatic gain control module and detect the gain that useful signal is also regulated this useful signal automatically in the data of input.Frequency down-converts and interpolating module recover the character rate with the input data sync, and according to the multiple interpolation of this character rate, generate the sampled signal of several times of character rates, sampled signal down-conversion with several times of character rates, generate baseband signal, baseband signal is by low pass filter, the baseband signal of one times of character rate of down-sampled one-tenth.Balanced following with noise suppression module removed echo and narrow-band noise from the baseband signal of one times of character rate, output signal to demodulator.The signal of demodulator after equilibrium carries out the planisphere judgement, and output judgement code stream carries out channel-decoding then, and decoded code stream is gone randomization, removes the physical frame encapsulation, forms MAC and wraps and export to the MAC layer by the MAC_RX interface.
When EOC network construction and network operation, the noise of the real-time Measurement Network of needs is so that transform and optimize network.And the physical chip of existing EOC network does not have the network noise measurement function, thereby can't come intelligence to choose or change centre frequency and character rate according to noise power spectrum, can't avoid the big frequency range of noise.
In the existing EOC network, the transmitted in both directions of data is divided into high frequency scheme (with the above frequency spectrum of 850MHz) and low frequency scheme (with the frequency spectrum of 0～65MHz), and the low frequency scheme is divided into single-carrier scheme and multi-carrier scheme again.Wherein, high frequency scheme link load is big, and coverage is little.The low frequency scheme of multicarrier requires height to the linearity of analog circuit, is unfavorable for the integrated of chip and reduces cost.The low frequency scheme of single carrier then has high speed, high reliability, characteristics cheaply, thereby has obtained extensive use.
In the low frequency scheme of single carrier, the physical chip of existing EOC network does not have well to solve the problem of invasion noise.The invasion noise mainly is the stack of a plurality of narrow-band noises, is normally suppressed by equilibrium in the physical chip and noise suppression module.
Existing equilibrium and noise suppression module see also Fig. 2, comprise feed forward equalizer (Feed ForwardEqualization), feedback equalizer (Feed Backward Equalizer), error prediction filter (Error Predictor), judgement or training data module (data decision or train).The input of feed forward equalizer is the output signal of frequency down-converts and interpolating module, the input of feedback equalizer is the judgement or the output signal Data of training data module, and addition formed the X_Filt signal after feed forward equalizer and feedback equalizer carried out linear filtering to separately input signal.The Err signal is the output Data that the X_Filt signal deducts judgement or training data module, and the Err signal is the input signal of error prediction filter, and the error prediction filter is the Err_Pred signal with the current narrowband noise signals of Err signal linear prediction in the past.The X_Equ signal is that the X_Filt signal deducts the Err_Pred signal, and the X_Equ signal is the input of judgement or training data module, and judgement or training data module are adjudicated and output signal Data according to planisphere input signal.Transmitter (in local side apparatus or the ustomer premises access equipment one) all will send one section given data as training data before sending user data, receiver (another in local side apparatus or the ustomer premises access equipment) just is called the training data state when receiving training data, be called normal operating conditions when receiving subscriber data.The DD_Err signal is the output Data that the X_Equ signal deducts judgement or training data module, and the DD_Err signal is the rub-out signal of feed forward equalizer, feedback equalizer and error prediction filter coefficient adaptive updates, represents with oblique line in the drawings.Feed forward equalizer and feedback equalizer all are sef-adapting filters, all comprise one group of filter coefficient, and this group coefficient all needs to set initial value, according to rub-out signal DD_Err adaptive updates filter coefficient, finally converges to one group of optimal value then.Existing equalizer and noise suppression module be not owing to there is the initial value of calculating filter coefficient, just train or blind training by training data, so the filter coefficient convergence rate is slow, be difficult to use in practice, therefore can't effectively handle the invasion noise, make the communication quality of EOC network be easy to be subjected to invading The noise.
Summary of the invention
Technical problem to be solved by this invention provides the physical chip in a kind of EOC network, and it has the function of real-time Measurement Network noise, and can effectively suppress to invade noise.For this reason, the present invention also will provide the implementation method of described physical chip.
For solving the problems of the technologies described above, the physical chip in the EOC network of the present invention comprises modulator, frequency up-converted and interpolating module, frame detection and automatic gain control module, frequency down-converts and interpolating module, demodulator; Also comprise power spectrum module, frequency scanning module, equilibrium and noise suppression module;
Described power spectrum module received frame detects the useful signal after the adjusting gain of exporting with the automatic gain control module, and calculates the power spectrum of this signal;
Described frequency scanning module receives the baseband signal of one times of character rate of frequency down-converts and interpolating module output, the upconvert conversion of frequency scanning module and interpolating module output center frequency and character rate are to frequency down-converts and interpolating module output center frequency and character rate;
Described equilibrium and noise suppression module receive the baseband signal of one times of character rate of frequency down-converts and interpolating module output, and echo in this signal and narrow-band noise are suppressed, and the signal of exporting then after the equilibrium is given demodulator.
The implementation method of physical chip comprises the method for the initialization filter coefficient of the method for power spectrum module rated output spectrum, method that the frequency scanning module is chosen centre frequency and character rate, balanced and noise suppression module calculating feed forward equalizer and feedback equalizer in the above-mentioned EOC network.
The method of described power spectrum module rated output spectrum is: the frequency of the estimated spectral of the useful signal after down conversion module gains the adjusting that frame detects and the automatic gain control module is exported down-converts to zero; Down-conversion signal passes through one or more low pass filters and down-sampled module successively, and each low pass filter and down-sampled module are all to target signal filter high fdrequency component and down-sampled certain multiple; Last signal is by the signal power module, and the signal power module is calculated the power of the frequency of described estimated spectral.
The method that described frequency scanning module is chosen centre frequency and character rate is: described frequency scanning module comprises indicator register, threshold register and centre frequency and character rate register; Described indicator register is used for identifying local side apparatus or ustomer premises access equipment; Has decision threshold in the described threshold register; The combination that has many group switching centres frequency and character rate in described centre frequency and the character rate register; When indicator register is designated ustomer premises access equipment, frequency scanning module on this ustomer premises access equipment is chosen first group switching centre frequency and the character rate in described centre frequency and the character rate register, and calculates the signal of reception and the correlation of training data with this; When the absolute value of this correlation greater than the threshold value in the threshold register, represent that then this group switching centre frequency and character rate are exactly centre frequency and the character rate that local side apparatus adopts, ustomer premises access equipment communicates with this and local side apparatus; Otherwise this ustomer premises access equipment selects next group switching centre frequency and the character rate in described centre frequency and the character rate register to proceed correlation value calculation, threshold ratio until the centre frequency and the character rate that find local side apparatus to adopt.
The method that described equilibrium and noise suppression module are calculated the initialization filter coefficient of feed forward equalizer and feedback equalizer is: sending the training data state, the impulse response that channel estimation module comes calculating channel with signal that receives and training data; According to the impulse response of channel, the coefficient initialization module is calculated the initial value of the filter coefficient of feedforward and feedback equalizer.
Physical chip and its implementation in the EOC network of the present invention are by power spectrum module computing network noise in real time; On local side apparatus, can choose or change centre frequency and character rate by the frequency scanning module, on ustomer premises access equipment, can follow the centre frequency and the character rate of local side apparatus; Can suppress to invade noise by equilibrium and noise suppression module after improving.More than three aspect integrated applications can avoid the bigger frequency range of noise automatically and carry out communication.
Description of drawings
Fig. 1 is the structural representation of physical chip in the existing EOC network;
Fig. 2 is the structural representation of existing equilibrium and noise suppression module;
Fig. 3 is the structural representation of physical chip in the EOC network of the present invention;
Fig. 4 is the structural representation of power spectrum module of the present invention;
Fig. 5 is the structural representation of frequency scanning module of the present invention;
Fig. 6 is the structural representation of equilibrium of the present invention and noise suppression module.
Embodiment
See also Fig. 3, the physical chip in the EOC network of the present invention comprises: AFE (analog front end), modulator, frequency up-converted and interpolating module, frame detection and automatic gain control module, power spectrum (Power Spectrum) module, frequency down-converts and interpolating module, frequency scanning (Frequency Sweep) module, equilibrium and noise suppression module, demodulator.
Described AFE (analog front end) is the data-interface of described physical chip and coaxial cable, on the one hand the sampled signal that frequency up-converted and interpolating module are sent sends to coaxial cable by the OUT interface after through digital-to-analogue conversion, low-pass filtering, amplification, receives data and sends to frame through output sampled signal after amplification, filtering, the analog-to-digital conversion from coaxial cable by the IN interface on the other hand and detect and gain control module.
Described modulator receives the MAC bag by the MAC_TX interface from the MAC layer, MAC is sealed be contained in the physical frame and carry out generating baseband signal after randomization and the chnnel coding, and baseband signal is sent to frequency up-converted and interpolating module.
Described frequency up-converted and interpolating module according to the dispatching centre frequency upconversion, then by interpolation filter, generate baseband signal sampled data and send to AFE (analog front end).
Described frame detects and the automatic gain control module receives the sampled signal that AFE (analog front end) is sent, therefrom detect useful signal, and regulate the gain of this useful signal automatically, the useful signal of regulating after the gain sends to power spectrum module and frequency down-converts and interpolating module.The signal that described useful signal or transmitter send, or the signal that needs rated output to compose.When for example needing the power spectrum of calculating noise, then useful signal is a noise.
Described power spectrum module received frame detects the useful signal after the adjusting gain of exporting with the automatic gain control module, and calculates the power spectrum of this signal, and result of calculation is stored in the register of physical chip, and the MAC layer can read this register.
Described frequency down-converts and interpolating module received frame detect the useful signal after the adjusting gain of exporting with the automatic gain control module, the character rate of recovery and input data sync (for example, transmitter is launched 1,000,000 symbols one second, receiver also can only be exported 1,000,000 symbols one second, otherwise communication just makes mistakes), and according to the multiple interpolation of this character rate, generate the intermediate-freuqncy signal of several times of character rates, and the intermediate-freuqncy signal down-conversion of several times of character rates is generated the baseband signal of several times of character rates, the baseband signal of several times of character rates is by low pass filter, the baseband signal of one times of character rate of down-sampled one-tenth.The baseband signal of this times of character rate sends to equilibrium and noise suppression module.
The input signal of described frequency scanning module is the baseband signal of one times of character rate of frequency down-converts and interpolating module output, the upconvert conversion of frequency scanning module and interpolating module output center frequency and character rate, to frequency down-converts and interpolating module output center frequency and character rate, the centre frequency of output and character rate are recorded in the physical chip register.
Described equilibrium and noise suppression module suppress echo in the baseband signal of one times of character rate and narrow-band noise, and the signal of exporting then after the equilibrium is given demodulator.
The signal of described demodulator after to equilibrium carries out planisphere judgement, channel-decoding, goes randomization, removes the physical frame encapsulation, recovers MAC bag back and exports to the MAC layer by the MAC_RX interface.
See also Fig. 4, power spectrum module of the present invention comprises down-conversion (DownConversion) module, one or more low pass filter and down-sampled (the Low-Pass Filter ﹠amp that order links to each other; DownSampler) module, signal power (Signal Power) module.Wherein down conversion module is carried out frequency spectrum shift (down-conversion) to the useful signal that frame detects after the adjusting of exporting with the automatic gain control module gains.Low pass filter and the down-sampled module signal after to down-conversion carries out the one or many low-pass filtering, and is down-sampled to signal simultaneously.The signal power module is calculated the power of down-sampled signal.
See also Fig. 5, frequency scanning module of the present invention comprises the register of indicator register, threshold register and a group switching centre frequency and character rate.The default value that prestores is all arranged in all registers, and MAC layer chip also can write programming to it.Described indicator register is used for identifying local side apparatus or ustomer premises access equipment.Described threshold register prestores decision threshold.Prestore the combination of multiple centre frequency and character rate in the register of described centre frequency and character rate.Described frequency scanning module further comprises (Threshold Compare) module of continuous relevant (Correlation) module of order, absolute value (ABS) module, threshold ratio.Transmitter all will send one section given data as training data before sending user data, receiver is done sign synchronization with training data, the filter coefficient of training equalizer etc.The centre frequency of described frequency down-converts and interpolating module utilization supposition and character rate calculate the baseband signal of one times of character rate, and (up-conversion and interpolating module need know that centre frequency and character rate could work, if do not know just to suppose one group, calculate by the frequency scanning module then and judge whether this supposition is correct), the data of output can be divided into two classes: training data and user data.Sending the training data state, the signal that correlation module calculating receives and the correlation of known training data also send to absolute value block.Absolute value block is calculated the absolute value of correlation and is sent to threshold ratio than module.The size of the absolute value of threshold value comparison module comparison correlation and the threshold value that prestores, if the absolute value of correlation is greater than threshold value, Jia Ding centre frequency is consistent with the centre frequency of character rate and local side apparatus emission with character rate so, otherwise just detects with next group switching centre frequency and character rate.
See also Fig. 6, equilibrium of the present invention and noise suppression module further comprise: feed forward equalizer, feedback equalizer, error prediction filter, judgement or training data module, channel estimation module (ChannelEstimation), coefficient initialization module (Coefficient Init).Frequency down-converts and interpolating module are exported two class data: training data and user data.Under the training data state, the baseband signal of one times of character rate of frequency down-converts and interpolating module output also sends to channel estimation module except sending to feed forward equalizer.Channel estimation module is estimated the impulse response of channel and is sent to the coefficient initialization module according to input and known training data from frequency down-converts and interpolating module.The coefficient initialization module is utilized the impulse response of channel to calculate the initialization filter coefficient of feed forward equalizer and feedback equalizer and is sent to feed forward equalizer and feedback equalizer respectively.Feed forward equalizer and feedback equalizer adopt the output initialization filter coefficient of coefficient initialization module.Feed forward equalizer and feedback equalizer all are sef-adapting filters, all comprise one group of filter coefficient, and this group coefficient all needs to set initial value, then according to rub-out signal adaptive updates filter coefficient, finally converges to one group of optimal value.The initial value of filter coefficient is very big to the convergence rate influence of filter, and the present invention is by estimating channel response, the initial value of calculating filter coefficient, thereby the convergence rate of quickening filter coefficient.Under the user data state, channel estimation module, coefficient initialization module are not done any operation.
The implementation method of the physical chip in the above-mentioned EOC network comprises that described power spectrum module estimates that method, the described frequency scanning module of the power spectrum of (promptly calculating) signal or noise choose or change the method for the method of centre frequency and character rate, described equilibrium and the initialization filter coefficient of noise suppression module calculating feed forward equalizer and feedback equalizer.These are to increase newly on the basis of the implementation method of existing physical chip.
See also Fig. 4, the method for the power spectrum of described power spectrum module estimated signal or noise is: described power spectrum module comprises the centre frequency register, and MAC layer chip can write programming to it.Useful signal down-conversion after down conversion module gains the adjusting that frame detects and the automatic gain control module is exported down-converts to zero to the frequency of centre frequency register appointment.Down-conversion signal passes through one or more low pass filters and down-sampled module successively, and each low pass filter and down-sampled module are all to target signal filter high fdrequency component and down-sampled certain multiple.Last signal is by the signal power module, and the signal power module is calculated the power of the frequency of described estimated spectral.Power spectrum is one group of power, and promptly signal is in one group of performance number of each frequency.
See also Fig. 5, described frequency scanning module is chosen or the method that changes centre frequency and character rate is: when indicator register is designated ustomer premises access equipment, frequency scanning module on this ustomer premises access equipment is chosen first group switching centre frequency and the character rate, and calculate the user data of reception and the correlation of training data (transmitter all can send one section known data as training data before sending user data) with this.When the absolute value of this correlation greater than the threshold value in the threshold register, represent that then this group switching centre frequency and character rate are exactly centre frequency and the character rate that local side apparatus adopts, ustomer premises access equipment communicates with this and local side apparatus.Otherwise this ustomer premises access equipment selects next group switching centre frequency and character rate to proceed correlation value calculation, threshold ratio until the centre frequency and the character rate that find local side apparatus to adopt.
See also Fig. 6, the method that described equilibrium and noise suppression module are calculated the initialization filter coefficient of feed forward equalizer and feedback equalizer is: transmitter sends signal and comprises known training data and user data, sending the training data state, the impulse response that channel estimation module comes calculating channel with signal that receives and training data.According to the impulse response of channel, the coefficient initialization module is calculated the initial value of the filter coefficient of feedforward and feedback equalizer, and feedforward and feedback equalizer are organized initial value initialization filter coefficient with this.The method of the impulse response of calculating channel and be prior art from the method that the filter coefficient of feedforward and feedback equalizer is calculated in the impulse response of channel is not given unnecessary details at this.
In sum, the physical chip in the EOC network of the present invention changes with noise suppression module balanced on the basis of existing physical chip, has increased power spectrum module and frequency scanning module simultaneously.Described power spectrum module can calculating noise power spectrum.Centre frequency and character rate can be chosen or change to described frequency scanning module on local side apparatus, can follow the centre frequency and the character rate of local side apparatus on ustomer premises access equipment.Described equilibrium and noise suppression module can suppress to invade noise.More than the utilization of three module synthesis, make physical chip of the present invention and its implementation can avoid the bigger frequency range of noise automatically and carry out communication.
Claims (7)
1. the physical chip in the EOC network comprises modulator, frequency up-converted and interpolating module, frame detects and automatic gain control module, frequency down-converts and interpolating module, demodulator; It is characterized in that described physical chip also comprises power spectrum module, frequency scanning module, equilibrium and noise suppression module;
Described power spectrum module received frame detects the useful signal after the adjusting gain of exporting with the automatic gain control module, and calculates the power spectrum of this signal;
Described frequency scanning module receives the baseband signal of one times of character rate of frequency down-converts and interpolating module output, the upconvert conversion of frequency scanning module and interpolating module output center frequency and character rate are to frequency down-converts and interpolating module output center frequency and character rate;
Described equilibrium and noise suppression module receive the baseband signal of one times of character rate of frequency down-converts and interpolating module output, and echo in this signal and narrow-band noise are suppressed, and the signal of exporting then after the equilibrium is given demodulator.
2. the physical chip in the EOC network according to claim 1 is characterized in that, described power spectrum module comprises down conversion module, one or more low pass filter and down-sampled module, the signal power module that order links to each other;
The useful signal that described down conversion module detects frame after the adjusting gain of exporting with the automatic gain control module carries out down-conversion;
Each low pass filter and down-sampled module are all carried out the one or many low-pass filtering to the signal after the down-conversion, carry out down-sampled to signal simultaneously;
Described signal power module is calculated the power of down-sampled signal.
3. the physical chip in the EOC network according to claim 1 is characterized in that, described frequency scanning module comprises correlation module, absolute value block, the threshold value comparison module that order links to each other;
Sending the training data state, described correlation module calculates the training data of reception and the correlation of known training data;
Described absolute value block is calculated the absolute value of correlation;
The size of the absolute value of described threshold value comparison module comparison correlation and the threshold value that prestores.
4. the physical chip in the EOC network according to claim 1 is characterized in that, described equilibrium and noise suppression module comprise feed forward equalizer, feedback equalizer, error prediction filter, channel estimation module, coefficient initialization module;
Sending under the training data state, the baseband signal of one times of character rate of described frequency down-converts and interpolating module output also sends to channel estimation module except sending to feed forward equalizer;
Described channel estimation module is according to the impulse response of estimating channel from the input of frequency down-converts and interpolating module;
Described coefficient initialization module utilizes the impulse response of channel to calculate the initialization filter coefficient of feed forward equalizer and feedback equalizer.
5. the implementation method of physical chip is characterized in that in the EOC network as claimed in claim 2, and described method comprises the method for power spectrum module rated output spectrum, and concrete steps are:
The frequency of the estimated spectral of the signal after down conversion module gains the adjusting that frame detects and the automatic gain control module is exported down-converts to zero;
Down-conversion signal passes through one or more low pass filters and down-sampled module successively, and each low pass filter and down-sampled module are all to target signal filter high fdrequency component and down-sampled certain multiple;
Last signal is by the signal power module, and the signal power module is calculated the power of the frequency of described estimated spectral.
6. the implementation method of physical chip is characterized in that in the EOC network as claimed in claim 3, and described method comprises that described frequency scanning module chooses the method for centre frequency and character rate, and concrete steps are:
Described frequency scanning module comprises indicator register, threshold register and centre frequency and character rate register; Described indicator register is used for identifying local side apparatus or ustomer premises access equipment; Has decision threshold in the described threshold register; The combination that has many group switching centres frequency and character rate in described centre frequency and the character rate register;
When indicator register is designated ustomer premises access equipment, frequency scanning module on this ustomer premises access equipment is chosen first group switching centre frequency and the character rate in described centre frequency and the character rate register, and calculates the signal of reception and the correlation of training data with this;
When the absolute value of this correlation greater than the threshold value in the threshold register, represent that then this group switching centre frequency and character rate are exactly centre frequency and the character rate that local side apparatus adopts, ustomer premises access equipment communicates with this and local side apparatus;
Otherwise this ustomer premises access equipment selects next group switching centre frequency and the character rate in described centre frequency and the character rate register to proceed correlation value calculation, threshold ratio until the centre frequency and the character rate that find local side apparatus to adopt.
7. the implementation method of physical chip is characterized in that in the EOC network as claimed in claim 4, and described method comprises the method for the initialization filter coefficient of balanced and noise suppression module calculating feed forward equalizer and feedback equalizer, and concrete steps are:
Sending the training data state, the impulse response that channel estimation module comes calculating channel with signal that receives and training data;
According to the impulse response of channel, the coefficient initialization module is calculated the initial value of the filter coefficient of feedforward and feedback equalizer.
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| CN104243367A (en) * | 2013-06-14 | 2014-12-24 | 晨星半导体股份有限公司 | Receiving device and method for accelerating equalization convergence |
| CN105846986A (en) * | 2016-05-22 | 2016-08-10 | 上海大学 | Coaxial line signal frequency shift transmission method |
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| US20100138880A1 (en) * | 2008-12-02 | 2010-06-03 | At&T Intellectual Property I, L.P. | Ethernet over coaxial coupling system, method and apparatus |
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| US20030022650A1 (en) * | 2001-07-26 | 2003-01-30 | Masayuki Tsuji | Multipath noise reduction method, multipath noise reducer, and FM receiver |
| CN101277420A (en) * | 2007-03-27 | 2008-10-01 | 真宽通信技术（苏州）有限公司 | Bidirectional access equipment for CATV network |
| US20100138880A1 (en) * | 2008-12-02 | 2010-06-03 | At&T Intellectual Property I, L.P. | Ethernet over coaxial coupling system, method and apparatus |
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| CN104243367A (en) * | 2013-06-14 | 2014-12-24 | 晨星半导体股份有限公司 | Receiving device and method for accelerating equalization convergence |
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