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Transmission system with high frequency stability

A technology of transmission system and transmission frequency band, which is applied in the direction of transmission system, radio transmission system, electrical components, etc., and can solve problems such as interference

Inactive Publication Date: 2004-01-21
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] This system cannot be used with figure 1 and figure 2 In the corresponding unitary distribution network
The use of fixed frequencies for the entire distribution network will cause interference between areas utilizing the same frequency

Method used

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  • Transmission system with high frequency stability
  • Transmission system with high frequency stability
  • Transmission system with high frequency stability

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Embodiment Construction

[0025] In this specification, labels in figures using the same group of letters denote the same or similar elements.

[0026] Figure 5 represents an external unit according to a first embodiment of the present invention. Antenna 100 is used to receive signals originating from a base station and to transmit signals to the same base station. The transmission band consists of two disjoint frequency segments, one for downlink signals and the other for uplink signals. As an example, downlink signals are between 40.5 and 41 GHz and uplink signals are between 41.5 and 41.6 GHz.

[0027] For the downlink, a bandpass filter 101 connected to the antenna selects a useful frequency band such as the 40.5 to 41 GHz band. Amplifier 102 amplifies the signal leaving filter 101 . The mixer 103 mixes the signal originating from the amplifier 102 with the signal originating from the oscillator 104 having a switching frequency. For example, the oscillator 104 is a dielectric resonator with c...

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PUM

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Abstract

The invention proposes a transmission system using a reference subcarrier to synchronize a local oscillator 104. The reference subcarrier can be placed at various locations of the band allotted to an operator. The external unit 1 of the reception device comprises frequency-wise selection means 107 which make it possible to select the synchronization subcarrier.

Description

technical field [0001] The invention relates to a transmission system with high frequency stability. More specifically, the invention relates to external units placed on the user side. Background technique [0002] By the original MMDS (Microwave Multipoint Distribution System), LMDS (Local Multipoint Distribution System) and MVDS (Multipoint Video Distribution System), those skilled in the art know radio transmission systems of the point-multipoint type. These systems for program broadcasting provide a return link for the user terminal that allows the user to interact with the received program. [0003] In Europe, preparations have been made to implement an LMDS-type system comprising 24 broadcast channels (also called downlinks) with a bandwidth of 33 MHz, and 25 return channels (or uplinks) with a bandwidth of 2 MHz, These channels are located between 40.5 and 42.5 GHz (for more details on channel allocation, those skilled in the art can refer to the MPT-1560-RA standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H04B1/10H04B1/28H04Q7/28
CPCH04B1/28H04B1/1027
Inventor 奥利维耶·莫卡尔让-伊夫·勒纳乌尔让-吕克·罗贝尔
Owner THOMSON LICENSING SA