  This study proposes a symbol-level precoding algorithm based on the minimum
mean squared error design objective under a strict per antenna power constraint
for PSK modulation. The proposed design is then formulated in the standard form
of a second-order cone program, allowing for an optimal solution via the
interior point method. Numerical results indicate that the proposed design is
superior to the existing approaches in terms of bit-error-rate for the low and
intermediate SNR regime.
