Patent ID: 9444600
Filing Date: 2016-09-13
CPC Classification: H04L

Claim Text:
1. A method for communication in a wideband high frequency (HF) communication system comprising a transmitter for an HF signal and a receiver, at least n communication channels ch n , an FEC error correction code and an interleaver that are common to the n communication channels, the system determining a communication quality Qn from measured signals provided by each of the n communication channels ch n , data being transmitted in a form of a frame comprising an initial synchronization preamble and a standard autobaud followed by a block of data, wherein the method allows a use of n channels in parallel, sharing one and the same coder and one and the same interleaver to benefit from frequency diversity protection, while allowing use of different modulations on the n communication channels and providing redundancy on information pertaining to coding, interleaving, and modulation by channel, the method comprising: introducing, into a frame of the data in the transmitted HF signal, an autobaud extension preamble after the standard autobaud, said extension preamble having at least the following information: choosing the modulation on a communication channel n on a basis of a link quality of said communication channel, operating a common coding and interleaving on the n communication channels, and transmitting the information introduced into a shared autobaud at the receiver.