Method for forming a training sequence

A transmitter for transmitting information in one or several data frames at one or several carrier frequencies, the transmitter comprising means for forming at least one training sequence and connecting the training sequence to a data frame to be transmitted, the training sequence being intended for synchronizing a receiver, said means for forming also forming the training sequence of three or more training parts so that at least two adjacent training parts are formed substantially identical and at least one training part is formed substantially as a negation to said identical training parts, and means for transmitting coupled to said means for forming.

A communication system comprising:

• a transmitter for transmitting information in a communication channel in one or several data frames, and means for forming at least one training sequence and connecting the sequence to a data frame to be transmitted,
• a receiver for receiving transmitted information from the communication channel, means for synchronizing the receiver, said means for forming also forming a training sequence of three or more training parts in such a way that at least two adjacent training parts are formed substantially identical and at least one training part is formed substantially as a negation to said identical training parts.

A transmitter for transmitting information in one or several data frames at one or several carrier frequencies, the transmitter comprising means for forming at least one training sequence and connecting the sequence to a data frame to be transmitted, the training sequence being intended for synchronizing a receiver, said means for forming also forming the training sequence of three or more training parts so that at least two adjacent training parts are formed substantially identical, and at least one training part is formed substantially different from said identical training parts, and

• means for transmitting coupled to said means for forming.

A transmitter for transmitting information in one or several data frames at one or several carrier frequencies, the transmitter comprising means for forming at least one training sequence and connecting the sequence to a data frame to be transmitted, the training sequence being intended for synchronizing a receiver, said means for forming also forming the training sequence of three or more training parts so that at least two adjacent training parts are formed substantially as negations to each other, and at least one training part is formed substantially different, and means for transmitting coupled to said means for forming.