  This paper considers the beamforming optimization for sensing a point-like
scatterer using a bistatic multiple-input multiple-output (MIMO) orthogonal
frequency-division multiplexing (OFDM) radar, which could be part of a joint
communication and sensing system. The goal is to minimize the Cram\'er-Rao
bound on the target position's estimation error, where the radar already knows
an approximate position that is taken into account in the optimization. The
optimization allows for beamforming with more than one beam per subcarrier.
Optimal solutions for the beamforming are discussed for known and unknown
channel gain. Numerical results show that beamforming with at most one beam per
subcarrier is optimal for certain parameters, but for other parameters, optimal
solutions need two beams on some subcarriers. In addition, the degree of
freedom in selecting which end of the bistatic radar should transmit and
receive is considered.
