Selection of training sequences for multiple-in multiple-out transmissions

A method of transmission in a cellular communication system including a Multiple-In Multiple-Out (MIMO) transmitter having a plurality of antennas, the method comprising:

• providing an indication of a first antenna for the transmission of a first message, the first antenna being one of the plurality of antennas and an indication of a second antenna for the transmission of a second message, the second antenna being one of the plurality of antennas, wherein each antenna in the plurality of antennas is associated with a subset of training sequences a first of the plurality of antennas being associated with a first of the subsets of training sequences and a second of the plurality of antennas being associated with a second of the subsets of training sequences, and the subsets of training sequences are disjoint and form a set of training sequences associated with a cell of the MIMO transmitter;
• based on the provided indication, selecting a training sequence for the first message, the training sequence being selected from the first subset of training sequences associated with the first antenna and selecting a second training sequence for the second message, the training sequence being selected from the second subset of training sequences associated with the second antenna;
• after the selection of the training sequences, generating the first message comprising the selected first training sequence so that the first message is identifiable as being associated with the first antenna and generating the second message comprising the selected second training sequence so that the second message is identifiable as being associated with the second antenna;
• transmitting the first message on the first antenna;
• and
• transmitting the second message on the second antenna.

A method of receiving in a cellular communication system including a Multiple-In Multiple-Out (MIMO) receiver, the method comprising:

• receiving a first message transmitted from a first antenna of a MIMO transmitter and a second message transmitted from a second antenna of the MIMO transmitter, the first message comprising a first training sequence from a set of training sequences, the second message comprising a second training sequence from the set of training sequences, the set of training sequences being associated with a cell of the MIMO transmitter and comprising disjoint subsets of training sequences for each of a plurality of antennas of the MIMO transmitter including a first of the plurality of antennas being associated with a first of the subsets of training sequences and a second of the plurality of antennas being associated with a second of the subsets of training sequences;
• determining the first antenna of the MIMO transmitter from which the first message is transmitted in response to the first training sequence;
• and
• determining the second antenna of the MIMO transmitter from which the second message is transmitted in response to the second training sequence.

An apparatus comprising a wireless user equipment for a cellular communication system, the wireless user equipment having a computer program stored therein and further including a Multiple-In Multiple-Out (MIMO) receiver, the computer program comprising instructions for:

• receiving a first message transmitted from a first antenna of a MIMO transmitter, and a second message transmitted from a second antenna of the MIMO transmitter, the first message comprising a first training sequence from a set of training sequences, the second message comprising a second training sequence from the set of training sequences, the set of training sequences being associated with a cell of the MIMO transmitter and comprising disjoint subsets of training sequences for each of a plurality of antennas of the MIMO transmitter;
• and
• determining a first antenna of the MIMO transmitter from which the first message is transmitted based on the first training sequence, and
• determining the second antenna of the MIMO transmitter from which the second message is transmitted in response to the second training sequence.

An apparatus comprising a base station for a cellular communication system, the base station having a computer program stored therein and further including a Multiple-In Multiple-Out (MIMO) transmitter having a plurality of antennas, the computer program comprising instructions for:

• providing an indication of a first antenna for the transmission of a first message, the first antenna being one of the plurality of antennas and an indication of a second antenna for the transmission of a second message, the second antenna being one of the plurality of antennas, wherein each antenna in the plurality of antennas is associated with a subset of training sequences a first of the plurality of antennas being associated with a first of the subsets of training sequences and a second of the plurality of antennas being associated with a second of the subsets of training sequences, and the subsets of training sequences are disjoint and form a set of training sequences associated with a cell of the MIMO transmitter;
• based on the provided indication, selecting a training sequence for the first message, the training sequence being selected from the first subset of training sequences associated with the first antenna and selecting a second training sequence for the second message, the second training sequence being selected from the second subset of training sequences associated with the second antenna;
• after the selection of the training sequences, generating the first message comprising the selected first training sequence so that the first message is identifiable as being associated with the first antenna and generating the second message comprising the selected second training sequence so that the second message is identifiable as being associated with the second antenna;
• transmitting the first message on the first antenna;
• and
• transmitting the second message on the second antenna.