The invention discloses a mode division multiple
access method based on orbital
angular momentum (OAM). The method comprises the following steps: modulating M (M is greater than or equal to 1) paths of
baseband signals onto a
millimeter wave (the formula is described in the specification) carrier of an OAM mode produced by a
phased array antenna and carrying an eigenvalue li, wherein the OAM modeis expressed by a Laguerre-
Gaussian beam, a total sending
signal is expressed as (the formula is described in the specification), and the total
signal received by a receiving end is (the formula is described in the specification); then after k (k is smaller than or equal to M and is greater than or equal to l) terminals receive the
signal (the formula is described in the specification), using a receiving
antenna array to analyze the own necessary ith path of
baseband signals from the (the formula is described in the specification) to obtain the ith path of
baseband receiving signals; and finally performing sampling and quantitative
processing on (the formula is described in the specification) to obtain quantitative baseband receiving signals (the formula is described in the specification),wherein T represents a code element interval. The invention provides a mode division multiple access scheme using the OAM mode as a new degree of freedom by using the orthogonality of the OAM beams and the
Hilbert space characteristics of the mode l thereof, and the mode division multiple access scheme provided by the invention can improve the spectrum
utilization rate and increase the equipmentconnection number, thereby greatly improving the capacity of a
millimeter wave
system and satisfying the transmission requirements of
mass data in the future, and the application prospect is extensive.