Patent ID: 8261079

Claim:
A method for establishing shared information, the method comprising: determining a first estimated characteristic of a communication channel between the first node and a second node based on one or more signals transmitted from the first node to the second node; determining a second estimated characteristic of the communication channel based on one or more signals transmitted from the second node to the first node; generating a first data sequence at the first node; generating a second data sequence at the second node; transmitting a signal from the first node to the second node, at least a portion of the signal being modulated with the first data sequence according to the first estimated characteristic; transmitting a signal from the second node to the first node, at least a portion of the signal being modulated with the second data sequence according to the second estimated characteristic; and forming shared information at each of the first and second nodes based on at least a portion of the first data sequence and at least a portion of the second data sequence.