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Telecommunications

Device-for-measuring-the-quality-of-a-digital-radio-link

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Device for measuring the quality of a digital radio link

Details

Inventors: Bursztejn, Jacques;
Assignee: Thomson CSF (Paris, FR)
Primary Examiner: Smith; Jerry
Assistant Examiner:
Attorney, Agent or Firm: Plottel; Roland

The device determines the error rate by the periodic evaluation of the parity of a pre-determined number of bits, the synchronism of said evaluation at transmission and reception being ensured by the recognition of a predetermined sequence in the binary information signal, the parity information being transmitted by an auxiliary modulation independent of that of the information flow.

DETAILED DESCRIPTION The object of the present invention is to obviate these disadvantages.
According to an aspect of the invention, there is provided a device for measuring the quality of a digital radio link, having a transmitter of a digital information signal and a receiver of that signal.
The transmitter includes means for generating parity bits for sequences of n successive bits of information in the digital information signal, a control for determining the beginning of the sequence, and means for transmitting with said information signal at least part of said parity bits.
The receiver includes a detector for detecting the transmitted parity bits.
It also includes means for generating parity bits for sequences of n successive bits of information in the digital information signal, as received.
It also has a control means for determining the beginning of a sequence and comparing means for comparing the transmitted parity bits and the generated parity bits.
The latter control means does a bit by bit recognition of any sequence of k predetermined bits forming a reference sequence (k being smaller than n), and supplying a control signal to the parity bit generator.

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