Multipath Separation and Parameter Estimation by Single RIS Antenna in
Channel identification and measurement accuracywill greatly affect
wireless communication performance. Thebroadcasting of electromagnetic
waves will produce multipath,and its superposition will lead to fading.
If the multipath canbe separated and the phase of each path can be
adjustedseparately, better signal transmission and reception
strategiescan be designed to weaken or eliminate fading and
improvesignal transmission performance. In this paper, we first
analyzethe multipath structure of the wireless channel, then utilize
thedynamic isomeric characteristics of the reconfigurable
intelligentsurface (RIS) antenna, also called dynamic metamaterial
antenna(DMA), to form differentiated patterns, and rapidly sampleswithin
a period of single pilot symbol, so that a group ofmultipath signals are
projected on multiple patterns and pathscan be separated and measured.
We simulated and evaluated the normalized mean square error of the
parameter estimates, including angle of arrival and path gain of
channels underdifferent conditions. The results demonstrate that even
single1-bi coding RIS antenna can achieve well multipath separationand
parameter estimation effects.