MULTI-CHANNEL THROUGH-WALL COMMUNICATION SYSTEM USING CROSSTALK SUPPRESSION

摘要

A system for communicating through a solid wall uses piezoelectric transducers in a multiple-input multiple-output configuration and applies crosstalk suppression. Methods of suppressing or avoiding crosstalk between parallel communication channels includes zero-forcing, eigenmode transmission, and least mean squared error processing. Orthogonal frequency division multiplexing can be used to increase transmission rates using many subchannels. Bit-loading can be used to maximize system performance.

主权项

1. A method of sending signals through a barrier using multiple-input multiple-output (MIMO) channels comprising transducers and zero forcing crosstalk suppression, the method comprising the steps of:
providing a barrier, the barrier having a transmitter assembly on a first side of the barrier and a receiver assembly on a second side of the barrier; wherein the transmitter assembly comprises a plurality of transmit transducers coupled to the first side of the barrier; wherein the receiver assembly comprises a plurality of receiver transducers coupled to the second side of the barrier; wherein equal numbers of transmit transducers and receiver transducers are provided, and wherein each transmit transducer is paired with and axially aligned with a corresponding receiver transducer on the opposite side of the barrier; providing a plurality of communication channels for communicating signals through the barrier, wherein each communication channel comprises a portion of the barrier which is located between a pair of aligned transmit and receiver transducers, wherein the number of communication channels is the same as the number of transmit transducer and receiver transducer pairs, and wherein a plurality of the communication channels collectively form part of a MIMO signaling arrangement; sending a transmit signal from the first side of the barrier through at least one communication channel using at least one transmit transducer; receiving a receive signal vector at the receiver transducers; determining a channel gain matrix H for the plurality of communication channels which are part of the MIMO signaling arrangement; using zero forcing to cancel crosstalk within the MIMO signaling arrangement, wherein the step of using zero forcing comprises scaling the receive signal vector with the inverse of the channel gain matrix H.