| Summary: | 碩士 === 國立清華大學 === 通訊工程研究所 === 102 === This thesis considers the energy-efficient precoding matrix design for a relay-aided multiuser
downlink multiple-input single-output (MISO) wireless system. This problem is nonconvex
and complicated in general and has drawn extensive attention, but few effective and efficient
algorithms have been reported. In this thesis, the precoders of the base station (BS) and
the relay station (RS) both equipped with multiple antennas are designed to maximize the
transmit energy efficiency (EE), defined as the ratio between the system sum rate and the
total power consumption, under respective quality-of-service (QoS) constraints of singleantenna
users and the transmit power constraints on the BS and the RS. In view of the fact
that the associated optimization problem is a nonconvex fractional programming, a successive
Dinkelbach and convex approximation (SDCA) algorithm with convergence guaranteed is
proposed to cope with the problem. Some simulation results are provided to demonstrate
the effectiveness of the proposed SDCA algorithm, and significant EE improvement as the
number of antennas at the BS and the RS increases (i.e., more spatial degrees of freedom).
Finally, some conclusions are provided.
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