Method of error protected transmission, method of error protected reception of data and transmission system for transmission of data

A method for error protected reception of data, the method including a basic cycle comprising the steps of:

• receiving a signal comprising a number of simultaneously active, modulated frequency channels, each having been modulated dependent upon at least one own particular data-item;
• demodulating the particular data items from the frequency channels;
• selecting for each particular data-item a logic position in a logic succession, the logic position being an inverse pseudo-random function of a particular frequency position among the frequency channels of a particular frequency channel from which the particular data-item was demodulated;
• and
• decoding the data from the logic succession of data-items according to an error correction code which is more robust against errors that are separate from each other in the logic succession than against errors that occur in a burst in the logic succession.

A transmission system for error protected transmission of data, the transmission system comprising:

• a transmission channel;
• a transmitting section including
• an encoder for encoding the data into a logic succession of data-items in an error correction code which is more robust against errors that are separate from each other in the logic succession than against errors that occur in a burst in the logic succession;
• a signal generator for generating a signal comprising a number of simultaneously active, modulated frequency channels;
• selecting means for selecting for each particular data-item a particular frequency channel having a particular frequency position among the frequency channels, the particular frequency position being a pseudo random function of a logic position of that particular data-item in the logic succession;
• a modulator for modulating each frequency channel dependent upon at least a respective one of the data-items, the particular data-item being modulated in the particular frequency channel;
• a transmitter for transmitting the signal via the transmission channel;
• and
• a receiving section including
• a reception input for receiving the signal from the transmission channel;
• a demodulator for demodulating the data-items from the frequency channels in the signal;
• inverse selecting means for selecting the logic position of the particular data-item as an inverse pseudo-random function of the particular frequency position of the particular frequency channel from which the particular data-item was demodulated;
• and
• a decoder for decoding data from the logic succession of data-items according to the error correction code.

A transmitting apparatus for pseudo random interleaving of digital data comprising:

• an encoder for encoding the digital data into a logic sequence of dataitems in an error correction code,
• means for generating a signal comprising a number of simultaneously active, modulated frequency channels,
• means coupled to an output of the encoder for directing successive data items to respective different frequency channels as a pseudo random function,
• a modulator coupled to an output of said generating means for modulating each frequency channel dependent upon respective ones of the data-items, and
• a transmitter for transmitting the signal as a plurality of data items transmitted simultaneously in a plurality of said frequency channels.