Abstract
A novel cloud transmission (CTxn) technique is proposed based on the multiple-input multiple-output (MIMO), called MIMO CTxn. Even though conventional single-input single-output (SISO) CTxn is operated at a negative signal-to-interference plus noise power ratio (SINR), where interference power is the same as the desired signal power, a critical drawback of SISO CTxn is that the maximum achievable spectral efficiency is less than 1 bit/s/Hz. Applying a MIMO technique to the conventional SISO CTxn provides a very efficient way to support high-date-rate service for delivering local contents, even at a negative SINR. Simulation results show that MIMO CTxn outperforms SISO CTxn while supporting high-order modulation and a high code rate. For instance, 16-QAM code rate 1/3 MIMO CTxn outperforms 4-QAM code rate 1/3 SISO CTxn from the SINR point of view. Further, the performance of MIMO CTxn is invariant with respect to the power imbalance and the difference between the received signal strengths. This makes the coverage planning much easy because all the other regions operate well without any loss of data rate if the coverage is planned with respect to the worst case.
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