Low complexity adaptive LR-MMSE MIMO detector for joint transmission scenarios

In cellular mobile networks, the performance of cell-edge users is limited by high interference signal from neighboring cells. Recently, in modern cellular communication systems, such as LTE-Advanced, the Coordinated Multi-Point Transmission technology is considered to improve the cell-edge users performance. In downlink of a CoMP scenario, the joint transmission can significantly reduce the interference. In this technique, the data signal is jointly transmitted from multiple-cell to the user equipment. However, in this technique the statistical properties of MIMO channel from the cells to the user affect the performance of MIMO detector, which can be expressed by the condition number. This paper presents an analysis of condition number of multiple MIMO channel in joint transmission scenario and proposes a low complexity adaptive LR-MMSE MIMO detection scheme. The computational complexity of proposed detection scheme is reduced by more than 36.5% in comparison to conventional LR-aided detector, while its performance is close to the performance of conventional LR-aided MIMO detector.