Method of adaptive frequency assignment to a plurality of antennas

1. Method of transmission of at least a data packet by several transmission antennas configured to transmit a signal, wherein it comprises:

an encoding of a first data packet into a first encoded block and a second data packet into a second encoded block;

a mapping of first frequency channel to a first set comprising at least a transmission antenna;

a mapping of second frequency channel to a second set comprising at least a transmission antenna, the first frequency channel being different from the second frequency channel;

a transmission of the first encoded block on the first set of at least a transmission antenna and on the second set of at least a transmission antenna;

if quality of reception at first frequency channel is lower than a threshold,

a mapping to second frequency channel or third frequency channel different from first frequency channel to the first set comprising at least a transmission antenna; and

a transmission of the second encoded block on the first set of at least a transmission antenna and on the second set of at least a transmission antenna.

2. Method according to claim 1 , wherein, if quality of reception at first frequency channel is greater than a threshold, it comprises:

a mapping to first frequency channel or third frequency channel different from second frequency channel to at least a part of the second set comprising at least a transmission antenna; and

a transmission of the second encoded block on the first set of at least a transmission antenna and on the second set of at least a transmission antenna.

3. Method according to claim 1 , wherein it comprises a mapping of antenna according to noise levels, each noise level being associated to each frequencies.

4. Method according to claim 2 , wherein noise levels are measured at the transmitter.

5. Method according to claim 1 , wherein it comprises:

a mapping of antenna according to at least a reception quality level at a given frequency channel; and

a reception of at least a reception quality level information, the reception quality level information being transmitted by a receiver.

6. Method according to claim 5 , wherein the reception quality level information is transmitted by a receiver used as destination of first encoded blocks.

7. Method according to claim 1 , wherein the transmission of the first encoded block on the first set of at least a transmission antenna is made at a first power level and on the second set of at least a transmission antenna at a second power level, the first power level being lower than the second power level.

8. Method according to claim 1 , wherein the encoding of first data packet into the first encoded block is a space time or space frequency block encoding.

9. Method of reception of at least a data block by several reception antennas configured to receive a signal, the method being implemented in one receiver, wherein the method comprises:

mapping of first frequency channel to a first set comprising at least a reception antenna;

mapping of second frequency channel to a second set comprising at least a reception antenna, the first frequency channel being different from the second frequency channel;

receiving of at least a first encoded block on the first set of at least a reception antenna and on the second set of at least a reception antenna;

decoding of the at least one received first encoded block into at least one first data packet;

testing of quality of reception of the signal at a first frequency channel;

checking for a modification of transmission frequency channel mapping; and

adapting the frequency channel mapping on reception antennas on transmission frequencies used by the transmitter according to the checked result.

10. Method according to claim 9 , wherein it comprises the transmission of an information representative of at least a reception quality level at a determined frequency channel, the information being transmitted to the transmitter transmitting the first encoded block.