WO2007000777B1 - Broadband hf/vhf/uhf communication on power lines - Google Patents

Broadband hf/vhf/uhf communication on power lines

Info

Publication number
WO2007000777B1
WO2007000777B1 PCT/IN2006/000223 IN2006000223W WO2007000777B1 WO 2007000777 B1 WO2007000777 B1 WO 2007000777B1 IN 2006000223 W IN2006000223 W IN 2006000223W WO 2007000777 B1 WO2007000777 B1 WO 2007000777B1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission
conductors
frequency
power
catv
Prior art date
Application number
PCT/IN2006/000223
Other languages
French (fr)
Other versions
WO2007000777A1 (en
Inventor
Narayana Srinivasa Prasa Gorur
Mayank Raj
Ritesh Kumar Kalle
Atul Pratap Singh
Selvapillai Srinivasa Mu Gorur
Venkata Samba Nar Srungarakavi
Reetesh Mukul
Kalluri R Sarma
Original Assignee
Narayana Srinivasa Prasa Gorur
Mayank Raj
Ritesh Kumar Kalle
Atul Pratap Singh
Selvapillai Srinivasa Mu Gorur
Venkata Samba Nar Srungarakavi
Reetesh Mukul
Kalluri R Sarma
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Narayana Srinivasa Prasa Gorur, Mayank Raj, Ritesh Kumar Kalle, Atul Pratap Singh, Selvapillai Srinivasa Mu Gorur, Venkata Samba Nar Srungarakavi, Reetesh Mukul, Kalluri R Sarma filed Critical Narayana Srinivasa Prasa Gorur
Publication of WO2007000777A1 publication Critical patent/WO2007000777A1/en
Publication of WO2007000777B1 publication Critical patent/WO2007000777B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/545—Audio/video application, e.g. interphone

Abstract

Disclosed herein is a method of transmitting a broadband signal over a set of one or more conductors which can handle transmission at VHF/UHF, exemplarily over a ubiquitous medium voltage (MV) or low voltage (LV) power line network in TV/CATV channels, wherein the transmission channel is optionally divided into a plurality of sub channels, each being separated from each other in time or in carrier frequency . It is another object of this invention to provide an apparatus for data communication at UHF/VHF over a power line network wherein a transmission channel is divided into a plurality of sub channels each being separated from each other in time or in carrier frequency, comprising: Transmission means (transmitter), Reception means (receiver), Coupling means (coupler) by using known methods, Signal Processing means (signal processing), Regeneration means and Error correction means.

Claims

AMENDED CLAIMS received by the International Bureau on 26 December 2006 (26.12.2006)
1. A method for transmitting a broadband signal over a network of aerial conductors of a power line network, such as a ubiquitous medium voltage (MV) or low voltage network, transmission occurring at UHF/VHF wherein a transmission channel is divided into a plurality of sub channels each being separated from the other in time, or in carrier frequency, or phase, comprising the steps of: i. Allocating unused sub channels which result in using those channels for transmission as per the invention, which aforesaid channels have not been earmarked for broadcast communication using electromagnetic radio wave propagation; ii. Generating a waveform and transmitting it in transverse mode (TEM/TE/TM) over two or more aerial conductors; iii. Transmitting the waveform by appropriate choices of amplitude and phase, and frequency, thereby controlling guided mode power and radiative mode power which enables an optimal balance between the guided wireline and radiative wireless modes of transmission, where, said guided mode predominantly restricts energy to the vicinity of the conductors, said radiative mode propagates energy throughout space. iv. Receiving a waveform with a loss less than free space loss, over two or more conductors and/or one or more antennas. Including the known steps of: v. Coupling a low power waveform to a high power transmission, MV or LV line; vi. Signal Processing; vii. Regeneration; and viii. Error Correction.
2. The method as claimed in claim 1, wherein the step of transmission further comprises the step of using excitation on at least three aerial conductors attempting to either a. Reduce radiative power, consequently improving wireline attenuation due to the better waveguiding nature of three or more conductors relative to two OR b. Increasing the radiative power emitted consequently improving the coverage by wireless mode of transmission;
24
3. A method as claimed in claim 1, wherein the step of allocating unused sub channels includes a step of: i. Spectral shaping to preferentially occupy spectral notches in the spectrum of said broadcast, said spectral notches caused by horizontal or vertical flyback in the case of TV broadcast, ii. Transmission at a power level non-interfering to said broadcast communication.
4. The method as claimed in claim 1, wherein the step of transmission uses a modulation scheme used by TV or CATV transmission.
5. The method as claimed in claim 1, wherein the step of waveform generation, signal processing, or reception includes the step of using standard TV, CATV and/or FM equipment, exemplarily modulators, amplifiers, and modems.
6. The method as claimed in claim 5, wherein the system uses an agile (i.e. frequency variable) or fixed frequency CATV modulator for signal generation and transmission.
7. The method as claimed in claim 5, wherein the system uses a CATV receiver for reception.
8. The method as claimed in claim 5, wherein the system uses a CATV transceiver for both transmission and reception.
9. The method as claimed in claim 5, wherein the system uses a CATV amplifier for boosting the power of the waveform at a point in between transmission and reception.
10. The method as claimed in claim 9, wherein the system uses a CATV amplifier followed by a signal processor, to boost the power associated with the waveform, and sharpen the transitions for an appropriate modulation scheme.
11. The method as claimed in claim 5, wherein the system uses a CATV transceiver for both transmission and reception, with a pre and/or a post equalizer to have the channel comprised by the network of aerial conductors seen by the said CATV transceiver match the characteristics of the CATV channel sufficiently accurately to enable cable modems to be directly used.
12. The method as claimed in claim 1, wherein the step of transmission includes the step of two or more conductors being excited simultaneously, with an appropriate choice of excitation characteristics such as relative phase and/or amplitude and/or frequency for reducing radiation, and hence reducing wireline channel attenuation.
13. The method as claimed in claim 1, wherein the step of transmission includes the step of two or more conductors being excited simultaneously, with an appropriate choice of excitation characteristics such as relative phase and/or amplitude and/or frequency for increasing radiation, and hence increasing coverage by the wireless mode of transmission.
14. The method as claimed in claim 1, wherein the step of reception further includes waveform detection on multiple conductors, and/or antennas located possibly close to multiple conductors.
15. The method as claimed in claim 12, wherein the step of transmission further comprises the step of adaptive amplitude modulation (power control) and/or phasing of currents injected at multiple conductors, to reduce radiation, and attenuation, the adaptation being done by co-operative signaling between the steps of transmission and reception.
16. The method as claimed in claim 12, wherein the step of transmission further comprises the step of signaling and/or data channel spread over multiple amplitude/phase/frequency excitations at each conductor, for diversity gain.
17. The method as claimed in claim 1, wherein the step of transmission further comprises the step of using the MV backbone for connecting a point with switching infrastructure to the antennas for cellular wireless and/or wire line signals.
18. The method as claimed in claim 17, wherein the MV backbone is used for implementation of 4+G systems, using possibly small antennas located close to each other (micro-cells).
26
19. The method as claimed in claim 1, wherein the step of signal processing uses Reed- Solomon and/or Turbo coding for improving SNR or reducing emissions.
20. The method as claimed in claim 1, wherein the step of regeneration further comprises the step of placing repeaters and/or regenerators periodically, with a repeater or regenerator handling one or more channels, said repeaters being exemplary amplifiers, and regenerators being exemplary decoders that completely decode the waveform, and/or sharpen the transitions.
21. The method as claimed in claim 1, wherein the step of allocating unused sub channels includes the step of frequency planning and/or allocation, to minimize interference between adjacent systems carrying possibly different data including the allocation of sub channels whose geographic coverage follows the contours of the MV grid, and which said coverage need not be approximately circular;
22. The method as claimed in claim 1, wherein the step of allocating unused sub channels includes the step of matching the frequency spectrum of the modulation chosen to the audio, chrominance and luminance signals of a TV broadcast system (including frequency notches and tilt).
23. The method as claimed in claim 1, where both wireless and wire line modes are used, simultaneously if required, with both wire line transceivers and wireless transceivers.
24. The method as claimed in claim 1 being used as a multi-access channel connecting all transceivers on the same power line.
25. The method as claimed in claim 24 being used as a multi-access channel, with lower frequencies allocated to further away transceiver pairs, possibly to improve SNR, reduce power and or increase bit rate
26. An apparatus for transmitting a broadband signal in transverse mode over a network of aerial conductors of a power line network, such as a ubiquitous medium voltage (MV) or low voltage network, transmission occurring at UHF/VHF wherein a transmission
27 channel is divided into a plurality of sub channels each being separated from the other in time, or in carrier frequency, i. Transmission means (transmitter) including means to control the excitation characteristics to enable an optimal mix of simultaneous or not simultaneous wireless and wireline transmission; ii. Reception means (receiver); Including the known means of iii. Coupling means (coupler) ; iv. Signal Processing means (signal processing); v. Regeneration means; and vi. Error correction means.
27. The apparatus as claimed in claim 26, wherein the transmission means comprises the means to excite at least three aerial conductors attempting to: a. Reduce radiative power, consequently improving wireline attenuation due to the better waveguiding nature of three or more conductors relative to two OR b. Increase the radiative power emitted, consequently improving the coverage by wireless modes of transmission;
28. The apparatus as claimed in claim 26, wherein the signal processing means comprises standard CATV and/or FM modulators and modems.
29. The apparatus as claimed in claim 26, wherein the transmission means performs auxiliary filtering by means of pre-shaping.
30. The apparatus as claimed in claim 26, wherein the reception means performs auxiliary filtering by means of post-shaping.
31. The apparatus as claimed in claim 26, wherein the transmission means comprises means for multiple conductors being excited simultaneously for reducing relative radiation, and hence reducing channel attenuation.
28
32. The apparatus as claimed in claim 26, wherein the transmission means comprises means for multiple excitations being replaced by signal detection on multiple conductors, and/or antennas located possibly close to the MV line.
33. The apparatus as claimed in claim 26, wherein the transmission means comprises fixed or adaptive amplitude modulation (power control) and/or phasing of currents injected at multiple conductors and/or frequency modulation, to reduce radiation, and attenuation, the adaptation being done by co-operative signaling between the steps of transmission and reception.
34. The apparatus as claimed in claim 26, wherein the transmission means comprises signaling and/or data channel spread over multiple amplitude/phase/frequency excitations at each conductor, for diversity gain.
35. The apparatus as claimed in claim 26, wherein the transmission means comprises using the MV backbone for connecting a point with switching infrastructure to the antennas for cellular wireless and/or wire line signals.
36. The apparatus as claimed in claim 26, wherein the transmission means comprises the MV backbone being used for implementation of 4+G systems, using possibly small antennas located close to each other (micro-cells).
37. The apparatus as claimed in claim 26, wherein the signal processing means comprises using Reed-Solomon and/or Turbo coding used for improving SNR or reducing emissions.
38. The apparatus as claimed in claim 26, wherein the regeneration means comprises placing repeaters and/or regenerators periodically, with a repeater or regenerator handling one or more channels, said repeaters being exemplary amplifiers, and regenerators being exemplary decoders that completely decode the signal, and/or sharpen the transitions.
39. The apparatus as claimed in claim 26, wherein the transmission means comprises frequency planning and/or allocation, to minimize interference between adjacent systems carrying possibly different data.
29
40. The apparatus as claimed in claim 26, wherein the transmission means comprises matching the frequency spectrum of the modulation chosen to the audio, chrominance and luminance signals of a TV broadcast system (including frequency notches and tilt).
41. The apparatus as claimed in claim 26, wherein the transmission means comprises choosing the frequency spectrum of the modulation such that it occupies the spectral notches of a vanilla TV signal, and possibly at a level transparent to TV sets.
42. The apparatus as claimed in claim 26, being used, simultaneously if required, in both wireless and wire line modes
30
PCT/IN2006/000223 2005-06-29 2006-06-29 Broadband hf/vhf/uhf communication on power lines WO2007000777A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN822/CHE/2005 2005-06-29
IN822CH2005 2005-06-29

Publications (2)

Publication Number Publication Date
WO2007000777A1 WO2007000777A1 (en) 2007-01-04
WO2007000777B1 true WO2007000777B1 (en) 2007-02-15

Family

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Country Status (1)

Country Link
WO (1) WO2007000777A1 (en)

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