A novel method of estimating desired signal to undesired signal power ratio for one-cell-frequency-reuse SIMO/MIMO-OF/TDMA systems

In one-cell-frequency-reuse MIMO (multi input multi output) - OFDMA based TDMA (OF/TDMA) systems, we face a problem that communication is blocked by interferences from adjacent cells. To solve this problem, an AMC (adaptive modulation and coding) scheme that is controlled by estimating DUR (desired signal to undesired signal power ratio) would be most promising. However, there is no accurate DUR estimation method using spreading codes for OF/TDMA systems due to the asynchronous FFT so far. In this paper, we propose a novel DUR estimation method by adding IFFT and time-window and introducing CI (carrier interferometry). The proposed DUR estimation method can separate the desired signal from a received signal even if FFT is asynchronous