ARRAY-TO-ARRAY BEAMFORMING AND ITERATIVE TIME REVERSAL TECHNIQUES

摘要

In examples, two arrays of Radio Frequency nodes achieve enhanced beamforming for communications between the arrays by successively sending sounding signals from one array to the other array. Each sounding signal sent by the first of the two arrays is beamformed through time reversal of an immediately preceding sounding signal received by the first array from the second array, and each sounding signal (except the initial sounding signal) sent by the second array is beamformed through time reversal of an immediately preceding sounding signal received by the second array from the first array. The initial sounding signal sent by the second array may be omnidirectional, beamformed through a guesstimate, random, predetermined, or determined through a search of the area where the arrays are located. With sufficient beamfocusing, the arrays may communicate by sending and receiving data from one array to the other array.

主权项

1. A method of radio frequency (RF) communication between arrays of nodes, the method comprising steps of:
aligning/synchronizing a plurality of ad hoc nodes of a first array in time and frequency; aligning/synchronizing a plurality of ad hoc nodes of a second array in time and frequency; transmitting a first initial sounding signal from the plurality of ad hoc nodes of the first array to the plurality of ad hoc nodes of the second array; and successively sending sounding signals from the plurality of ad hoc nodes of the first array to the plurality of ad hoc nodes of the second array and from the plurality of ad hoc nodes of the second array to the plurality of ad hoc nodes of the first array, wherein each sounding signal sent by the plurality of ad hoc nodes of the second array is beamformed through time reversal of an immediately preceding sounding signal received by the plurality of ad hoc nodes of the second array from the plurality of ad hoc nodes of the first array, and each sounding signal except the first initial sounding signal sent by the plurality of ad hoc nodes of the first array is beamformed through time reversal of an immediately preceding sounding signal received by the plurality of ad hoc nodes of the first array from the plurality of ad hoc nodes of the second array.