Robust Precoding Formulti-user Miso Systems with Limited-feedback Channels
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چکیده
InMulti User Multiple Input Single Output (MU-MISO) systems one centralized transmitter with multiple antennas serves several decentralized single-antenna receivers. Precoding is an attractive way to remove multiuser interferences because it reduces cost and power consumption in the user equipment. When implementing precoding, however, the base station should know the Channel State Information (CSI). In Frequency Division Duplex (FDD), this information is sent from the receivers by means of a feedback channel, whose data rate is often severely limited. In this paper we investigate the utilization of the Karhunen-Loève (KL) transform to compress the CSI sent through the feedback channel. We model the errors caused by channel estimation, truncation and quantization of the KL coefficients and feedback delay. This error modeling is the basic premise to design robust Tomlinson Harashima Precoding (THP) based on a sum Mean Square Error (MSE) criterion. Our results show that robust THP clearly outperforms conventional THP transmitting a minimum amount of information from the receivers.
منابع مشابه
DESIGN OF LIMITED FEEDBACK FOR ROBUST MMSE PRECODING IN MULTIUSER MISO SYSTEMS Autora: PAULA MARÍA CASTRO CASTRO Directores: LUIS CASTEDO RIBAS,
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تاریخ انتشار 2007