Multiuser Space–Time Line Code With Optimal and Suboptimal Power Allocation Methods

Optimal power allocation in multiuser OFDM systems

Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique for achieving high downlink capacities in future cellular systems. A key issue in MU-OFDM is the allocation of the OFDM subcarriers and power among users sharing the channel. Previous allocation algorithms cannot ensure fairness in advance. In this paper, a proportional rate adaptive resource allocation meth...

Multiuser OFDM with adaptive subcarrier, bit, and power allocation

Multiuser orthogonal frequency division multiplexing (OFDM) with adaptive multiuser subcarrier allocation and adaptive modulation is considered. Assuming knowledge of the instantaneous channel gains for all users, we propose a multiuser OFDM subcarrier, bit, and power allocation algorithm to minimize the total transmit power. This is done by assigning each user a set of subcarriers and by deter...

Optimal resource allocation for OFDM multiuser channels

In this paper, a unifying framework for orthogonal frequency division multiplexing (OFDM) multiuser resource allocation is presented. The isolated seeming problems of maximizing a weighted sum of rates for a given power budget P̄ and minimizing sum power for given rate requirements R̄ can be interpreted jointly in this framework. To this end we embed the problems in a higher dimensional space. Ba...

Optimal Diversity Allocation in Coherent Multiuser Systems

Optimal Power Allocation in Zero-forcing MIMO-OFDM Downlink with Multiuser Diversity

This paper considers the optimal power allocation for a multiuser MIMO-OFDM downlink system using zero-forcing multiplexing, with the objective to maximize the system capacity. First, we consider the problem of user selection and power allocation for every subcarrier. By converting this combinatorial optimization problem into a convex one, an optimal power allocation algorithm has been derived....