Patent ID: 8498658

Claim:
A method for communications, comprising: at a base that transmits and receives communication signals, emitting an impulse-pulse s(t) in multiple directions; in response to emitting the impulse-pulse s(t), detecting at a first angular orientation and over a first solid-angle a channel impulse response, h(t), reflected from a remote target, wherein: the first angular orientation comprises first 3-D angular coordinates, (θ, φ), in a coordinate system with an origin at the base; the channel impulse response, h(t), comprises copies of the impulse-pulse s(t), each copy of the impulse-pulse s(t) provided to the remote target at a different time based on a length of a respective path traveled by the respective copy of the impulse-pulse s(t) through a communication channel between the base and the remote target; reversing in time domain the channel impulse response h(t); amplifying the time reversed channel impulse response h(−t); transmitting in the multiple directions the amplified time reversed channel impulse response, Gh(−t); and detecting from the multiple directions an amplified channel impulse response, Gh(t), based on residual portions of an amplified impulse-pulse Gs(t) reflected from the remote target, wherein the amplified impulse-pulse Gs(t) comprises copies of the impulse-pulses s(t) included in the transmitted amplified time reversed channel impulse response, Gh(−t) provided to the remote target at the same time.