Described herein are techniques related to transmitter precoding for optimizing positioning performance. The techniques are directed to transmit signals with relatively higher transmission power, in a direction along the line of sight between the transmitter and the receiver, than signals transmitted in other directions. The techniques render the first signal arriving at the receiver, as it travels along the line of sight between the transmitter and the receiver, to have stronger signal strength than the signal strengths of other signals that travel through non-LoS paths to reach the receiver.