CSIT Error Analysis in TDD Systems with Estimation Delay, Noise and Pilot Interference

Unified CSIT error models are proposed for TDD systems, with the integration of effects of the estimation delay, the noise and the pilot interference. For pilot interference, the modeling approach of stochastic geometry is adopted, which breaks the restriction of the fixed cross gain assumption in previous works. Both the pilot synchronized and unsynchronized cases are analyzed. The impact of shadowing is also studied. Based on the unified error model, the conditions when one imperfect factor dominates the overall CSIT error are derived. Simulation results verify that higher accuracy can be achieved by the proposed modeling method.