SINR analysis and energy allocation of preamble and training for time division CT with range extension

In this paper, we investigate the packet decoding performance degradation due to the joint effects of synchronization and channel estimation errors in orthogonal frequency division multiplexing (OFDM)-based time-division cooperating transmission (TDCT) for the purpose of range extension. The signal to interference and noise ratio (SINR) of maximal ratio combining (MRC) with OFDM TDCT is analyzed in multipath fading channels. We demonstrate the performance impairment on decoding for different TDCT implementation scenarios with conventional synchronization and different channel estimation schemes through the simulation of the practical system with complete synchronization, channel equalization and decoding processes. We show that when the total energy for synchronization and channel estimation is limited because of the range extension objective, the way energy is distributed between preamble and training sequence plays an important role.