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Vhf adapter for cable network

A cable network and adapter technology, applied in the field of VHF adapters, can solve the problems of inability to conform, offset, complex structure, etc.

Inactive Publication Date: 2005-09-14
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The structure is simple and offset, but it is not able to comply with the technical constraints mentioned above, or use a single embodiment to obtain the various frequency band plans of the DOCSIS standard
[0017] To comply with these constraints and obtain a multimodal stand-alone version of the ODU with this structure would require making the structure more complex, resulting in unacceptable overhead costs

Method used

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  • Vhf adapter for cable network
  • Vhf adapter for cable network
  • Vhf adapter for cable network

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Embodiment Construction

[0032] For the frequency of 40GHz MWS system figure 2 The spectrum allocation shown is for two operators A and B, enabling image 3 Four structures are shown.

[0033] In the first two structures, the downlink reception of the two operators is performed at the bottom of the frequency band in the bottom zone A, while the uplink transmission is performed at the top of the frequency band in the top zone B.

[0034] This assignment is reversed in the latter two structures.

[0035] The structural diagram of the ODU unit according to the present invention is as Figure 4 As shown, as an example, the numerical value of the frequency in the case of structure 1 is shown.

[0036] The antenna device 401 receives VHF downlink frequency 40.5 to 41.1 GHz and uplink frequency 42.24 to 42.3 GHz.

[0037] Two switching chains connect this device 401 to a multiplexer 402 for transmitting intermediate frequencies, the downlink being between 150 and 750 MHz and the uplink corresponding to ...

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Abstract

The invention relates to VHF adapters for cable networks of the ODU type. It consists in using two conversion chains, up and down, in which a very stable single reference oscillator (403) drives means (404, 405, 410, 423) of generating the VHF and IF local frequencies common to these two conversion chains. A very selective surface wave filter (417) makes it possible to reject the frequency of the local oscillator at the level of the first intermediate frequency. It makes it possible to obtain a DOCSIS compatible millimetre MWS ODU whose frequency stability and spectral purity satisfy the constraints of the cable standard without undertaking spectral inversion of the signals transmitted and received.

Description

technical field [0001] The present invention relates to VHF adapters commonly referred to as ODUs (stands for "outdoor unit"), more specifically for receiving by radio signals originating from base stations in a cable network to transmit these signals to application terminals, in particular audio or data terminal. The ODU unit is located outside the application terminal. Background technique [0002] Recent years have seen the emergence of point-to-multipoint distribution systems for a large number of millimeter frequency bands. Whereas the earliest studies involved only analog broadcasting systems, today, it involves digital systems providing state-of-the-art interactive services. [0003] The term "Multimedia Wireless System: WMS" has been chosen to denote all systems for convergence between the broadcasting domain and the communication domain, and providing broadband wireless access to subscribers of multimedia services. These systems require a large amount of bandwidt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/16H03D7/16H04B1/26
CPCH03D7/163
Inventor 让-吕克·罗伯特让-伊夫·勒纳乌尔沙利纳·古根
Owner THOMSON LICENSING SA
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