Patent ID: 7864880
Filing Date: 2011-01-04
Classification: H04B,H04L

Abstract:
1. A method comprising: processing a data stream of information-bearing symbols to form nonzero mean symbols and zero mean symbols, wherein the nonzero mean symbols are selected from a nonzero mean constellation, and wherein the zero mean symbols are selected from a zero mean constellation; transmitting at least one of the nonzero mean symbols with a predetermined period in a first stream of zero mean symbols through a communication channel during a synchronization phase, wherein the first stream of zero mean symbols comprises a plurality of the zero mean symbols, and wherein the predetermined period comprises an integer M; forming, with a transmitter device, the information-bearing symbols during the synchronization phase with symbol means determined according to the following equation: where μ o represents a nonzero mean value, k is a non-negative integer, s(kM+m) represents the (kM+m)th information-bearing symbol, and δ(m) represents a discrete-time unit impulse function evaluated at m; and transmitting a second stream of zero mean symbols through the communication channel outside of the synchronization phase.