Method for selecting frequency channels

A method for selecting frequency channels in a communication system using a frequency hopping method, in which data are transmitted between a transmitter and a receiver by means of radio transmission, which comprises the steps of:

• transmitting the data in a form data packets having a plurality of bits or in parts of the data packets in a frequency/time block;
• transmitting the data packets or parts of the data packets electively via a plurality of different frequency channels, wherein a respective data packet or parts of the respective data packet are coded before transmission by the transmitter and are decoded after reception by the receiver;
• evaluating a transmission quality of the frequency channels and, on a basis of an evaluation of the transmission quality of the frequency channels, a decision is made in respect of a selection of at least one frequency channel which is used to transmit the data,
• transmitting the data packet via the frequency channel from the transmitter to the receiver;
• receiving the data packet by the receiver;
• determining a likelihood ratio LR of the data packet by the receiver;
• estimating by the receiver a frequency deviation of a frequency reference device of the transmitter;
• determining an interference state of the data packet or of a defined part of the data packet on a basis of the likelihood ratio LR;
• evaluating the transmission quality of a respective frequency channel on a basis of the interference state of the data packet or of the part of the data packet;
• selecting and/or correcting the respective frequency channel or frequency channel pattern on the basis of an evaluation result and/or the frequency deviation;
• and
• communicating a selected and/or corrected frequency channel or frequency channel pattern from the receiver to the transmitter.

A method for selecting frequency channels in a communication system using a frequency hopping method, in which data are transmitted between a transmitter and a receiver by means of radio transmission, which comprises the steps of:

• transmitting the data in a form data packets having a plurality of bits or in parts of the data packets in a frequency/time block;
• transmitting the data packets or the parts of the data packets electively via a plurality of different frequency channels, wherein a respective data packet or the parts of the respective data packet is coded before transmission by the transmitter and is/are decoded after reception by the receiver;
• evaluating a transmission quality of the frequency channels and, on a basis of an evaluation of the transmission quality of the frequency channels, a decision is made in respect of a selection of at least one frequency channel which is used to transmit the data;
• selecting the frequency channel or the frequency channels on a basis of a random value;
• and
• transmitting the random value to the receiver in each case before the data transmission so that the receiver can determine a selection that has been made on a basis of the random value.