Distance-increasing and speeding-up method of single coaxial-cable bidirectional data transmission
A coaxial cable and data transmission technology, applied in the field of communication, can solve problems such as transmission rate not greater than 10Mbps, non-linear channels, interference, etc., and achieve the goal of increasing two-way data transmission distance, signal-to-noise ratio, and transmission rate Effect
Active Publication Date: 2013-04-24
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology
[0002] The two-way data transmission of a single coaxial cable with an impedance of 75Ω mostly uses analog modulation for transmission. Frequency division multiplexing is the most important method in analog communication at present. It is widely used in cable TV and microwave communication, but it has two disadvantages: One is that the modulation and demodulation equipment is relatively complicated, and the other is that inter-channel interference is generated due to unsatisfactory filter characteristics and non-linearity in the channel
In the prior art, most of the relay methods are used to increase the transmission distance, but many occasions require long-distance coaxial cables to be complete without breakpoints, and the relay method cannot meet the actual needs. The existing single coaxial cable carrier without relay The transmission distance of the digital modulation system is not greater than 400m, and the transmission rate is not greater than 10Mbps
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[0015] Below in conjunction with accompanying drawing and embodiment this technical scheme is described in detail:
[0016] Such as figure 1 As shown, the two ends of a single coaxial cable 120 are defined as terminal A 110 and terminal B 130 respectively. Terminal A 110 has a source clock, and all signals at terminal A are synchronized and controlled by terminal A clock 114. The uplink data is coded 111 and inserted into the frame header position with data consistent with the frequency of terminal A clock 114 and placed in the uplink time slot together, after filtering 112. The broadband transformer 113 is matched and sent, and transmitted to the B terminal 130 through the coaxial cable; the B terminal 130 receives the uplink data after being matched by the broadband transformer 134, and after the frequency selection amplification 133 and the threshold judgment 132, the clock is extracted from the uplink data frame header information and Regenerate the continuous clock, use ...
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The invention discloses a distance-increasing and speeding-up method of single coaxial-cable bidirectional data transmission and belongs to communication field. The distance-increasing and speeding-up method of the single coaxial-cable bidirectional data transmission can transmit 20 million bits per second (Mbps) bidirectionally on a single coaxial-cable with the length of 1000 meters. The time division multiplexing of downlink data and uplink data utilizes the Manchester code baseband transmission to be transmitted. Each frame timeslot can be divided into an uplink data timeslot, a free timeslot, a downlink data timeslot, and the free timeslot. A frequency-selecting amplifying circuit can form a frequency domain equalizer to compensate the frequency attenuation of the coaxial-cable so that a receiving end can recover baseband signals, wherein the baseband signals are recovered by the receiving end are same with the baseband signals transmitted by a transmitting end. The clock signals can be extracted by utilizing the clock information of each frame uplink data frame header and constant clock signals can be regenerated to demodulate the uplink data. The downlink data can seek and transmit corresponding downlink timeslots according to regenerated synchronous clock signals. The uplink data and the downlink data can be transmitted synchronously. The distance-increasing and speeding-up method of the single coaxial-cable bidirectional data transmission is suitable for long-distanced coaxial-cable bidirectional data transmission system, wherein the long-distanced coaxial-cable bidirectional data transmission is small in space, low in cost, and high in reliability.
Description
technical field [0001] The invention relates to the technical field of communication, in particular to a method based on a frequency-selective amplifying circuit capable of increasing the bidirectional data transmission distance and rate of a single coaxial cable. Background technique [0002] The two-way data transmission of a single coaxial cable with an impedance of 75Ω mostly uses analog modulation for transmission. Frequency division multiplexing is the most important method in analog communication at present. It is widely used in cable TV and microwave communication, but it has two disadvantages: One is that the modulation and demodulation equipment is relatively complicated, and the other is that inter-channel interference is generated due to unsatisfactory filter characteristics and non-linearity in the channel. The two-way data transmission of a single coaxial cable with an impedance of 50Ω adopts digital baseband transmission or carrier digital modulation. Under th...
Claims
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IPC IPC(8): H04B3/04
Inventor 谭博汪雪莲陈子龙张军胡卓宇
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP