Importance

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Abstract

At one node in a wireless communications network, a transmitter (i) encodes an outgoing data stream as a sequence of outgoing symbols of a symbol constellation, (ii) applies a sequence of random rotations to the outgoing symbols to generate an outgoing sequence of rotated symbols in the same symbol constellation, and (iii) transmits wireless signals based on the rotated symbols. At another network node, a receiver, having knowledge of the sequence of random rotations, (i) recovers an incoming sequence of rotated symbols from the received wireless signals, (ii) applies a corresponding sequence to de-rotations to the recovered rotated symbols to generate a sequence of de-rotated symbols, and (iii) decodes the de-rotated symbols to recover an incoming data stream that is ideally identical to the outgoing data stream. An eavesdropping node in the network that does not have knowledge of the sequence of random rotations is unable to recover meaningful data.

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First Claim