| Authors: | |
| Amr Elnakeeb | |
| Urbashi Mitra |
One Sentence Summary:
The CRB is proven to be effectively decoupled in delay and Doppler domains
Abstract:
-In this paper, the Cramér-Rao bound (CRB) on the time-varying narrowband leaked Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO OFDM) channel estimators is derived, under the assumption of deterministic sequences. The CRB is proven to be effectively decoupled in delay and Doppler domains. Fixed point equations for determining the optimal training sequences for the decoupled CRB are provided. Doppler-optimized training sequences are shown to be whiter. Optimized sequences exhibit a performance gain on the order of 5 dB and 2.5 dB over purely random sequences used for training for Doppler and delay, respectively.