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Current OFDMA systems group resource blocks into subband to form the basic feedback unit. Homogeneous feedback design with a common subband size is not aware of the heterogeneous channel statistics among users. Under a general correlated channel model, we demonstrate the gain of matching the subband size to the underlying channel statistics motivating(More)
This paper investigates the application of blind and semi-blind interference alignment methods in clustered small cell networks. First, we examine two simple straightforward extensions of blind interference alignment and observe that neither of them is uniformly superior under all user distribution. Then, we exploit the location information of the users and(More)
—This paper studies joint beamforming and power control in a coordinated multicell downlink system that serves multiple users per cell to maximize the minimum weighted signal-to-interference-plus-noise ratio. The optimal solution and distributed algorithm with geometrically fast convergence rate are derived by employing the nonlinear Perron-Frobenius theory(More)
The inherent heterogeneous structure resulting from user densities and large scale channel effects motivates heterogeneous partial feedback design in heterogeneous networks. In such emerging networks, a distributed scheduling policy which enjoys multiuser diversity as well as maintains fairness among users is favored for individual user rate enhancement and(More)
This paper investigates three open problems in random beamforming based communication systems: the scheduling policy with heterogeneous users, the closed form sum rate, and the randomness of multiuser diversity with selective feedback. By employing the cumulative distribution function based scheduling policy, we guarantee fairness among users as well as(More)
Random beamforming with greedy scheduling policy in a heterogeneous setting is only fair as the number of transmit antennas M grows asymptotically. In practical systems with finite M and heterogeneous users having diverse large scale channel effects, in order to guarantee fairness among users and exploit multiuser diversity as well, an alternate scheduling(More)
This paper investigates a joint power control and beamformer design in a correlated multiuser MISO downlink to minimize the weighted transmit power. We firstly review a distributed fixed-point iterative algorithm. This algorithm, though converging to the optimal solution, requires instantaneous power iteration. In order to reduce the implementation(More)
In modern heterogeneous wireless networks, the task of supporting fairness along with user priorities and concurrently achieving the highest possible system throughput is desirable and challenging. In this work, two classes of practical cumulative distribution function (CDF) based scheduling algorithms are developed to achieve these goals. These algorithms(More)