Suboptimal method for pilot and data power allocation in combined positioning and communications OFDM systems

The use of multicarrier signals for combined positioning and high data rate communications systems requires accurate estimation of timing offset and channel impulse response in order to achieve desirable performance. Previous work has investigated optimal pilot structures for joint timing offset and channel impulse response estimation, and the capacity maximizing pilot and data power allocation when taking only channel estimation into account. We study the problem of capacity maximization in an OFDM system when a certain time-delay estimation accuracy is required, thus taking into account the capabilities of the designed signal for positioning.