This paper presents a time-efficient optimal resource
allocation algorithm aiming to maximize the system
throughput of the single-user High Speed Downlink Packet
Access (HSDPA) deployed in femtocell base station. The system
throughput maximization with constrained total power is rst
formulated as a constrained integer programming problem. We
rst prove that a two-group bit and energy allocation provides
the global optimum solution in the system without multipath.
We then focus on the use of the two-group allocation method
over frequency selective channels. A pre-processing method was
used to systematically cluster and remove channels to stop using
energies over severely degraded channels with the two-group
allocation approach. This improves the system throughput whilst
greatly reducing the computation complexity. The proposed twogroup
approach with channel removal is suitable for femtocell
base station with limited signal processing capability.