Optimal downlink beamforming with additional constraints

• This work addresses the problem of joint downlink beamforming and power control with general Quality of Service (QoS) constraints. Previous work on downlink beamforming does not provide a framework to handle the additional constraints in a straightforward fashion. Herein, it is shown that the QoS requirements can be formulated as quadratic constraints to a convex optimization problem. An efficient algorithm for solving the problem, based on semidefinite optimization is presented. To demonstrate the performance of the proposed approach, we present an example using quadratic constraints to greatly decrease the probability of a low instantaneous Signal to Interference and Noise Ratio (SINR) for a receiver equipped with a RAKE combiner.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)

Nyckelord

QoS

RAKE combiner

RAKE receiver

convex optimization problem

joint downlink beamforming

power control

quadratic constraints

quality of service

Telecommunication

Telekommunikation

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)