Improving on time-reversal with MISO
Robert C. Daniels and Robert W. Heath, Jr.
Proceedings of the Eighth International Symposium on Wireless Personal
Multimedia Communications Conference, Aalborg, Denmark, September
Abstract:Time reversal precoding focuses on a specific
receiver by matched filtering with the channel. Unfortunately it also
results in temporal sidelobes that must be equalized at the receiver.
In this paper we consider multiple-input-single-output (MISO) precoding
as a means to avoid temporal sidelobes. We formulate and solve an
optimization problem that either forces the sidelobe energy to be zero
or maximizes the desired received signal energy to sidelobe energy
ratio. This choice depends explicitly on the system parameters. Using
this optimized precoding scheme in numerical simulations we demonstrate
improved temporal and spatial focusing performance.