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We consider joint optimization of transmit power, serving base station cluster (BSC) for coherent reception, beamforming and subcarrier allocation for the uplink channel of a multicell multicarrier system. The objective is to minimize the sum transmit power subject to user-specific rate constraints. Since the problem is nonconvex and NP-hard, finding the optimal solution is challenging and not practically...
We propose a joint bit and power loading, beamforming, multiple base station set (MBS) selection and subcarrier allocation algorithm for a resource allocation problem in a uplink multicell coordinated multi-basestation reception system. The objective is to minimize the total transmit power with rate constraint per mobile station (MS). The resources that we are considering include power, subcarrier,...
A three-dimensional (3D) multi-cell multi-user system model along with spatial array processing are presented and studied in this paper. Most of the radio propagation in the literature has been studied and modeled in a two dimensional plane. The 3D propagation channel modeling has drawn attentions recently. This is due to the fact that, in some scenarios, the assumption of small elevation domain angular...
We concentrate on the sum power minimization problem for the uplink of wireless cellular systems in this paper. Given a certain quality-of-service (QoS) constraint per mobile station (MS), the optimal power control and receiver beamforming are jointly considered with adaptive multi base station set (MBS) selection for joint reception. An iterative optimization algorithm is proposed accordingly. Although...
Assuming that multiple base stations (BSs) are coordinated for the joint reception of each user's transmitted signal in the uplink, we study the sum power minimization (SP-MIN) problem for the cellular systems. As BSs may have multiple antennas, power control and receive beamforming are jointly optimized with the adaptive multi BS set (MBS) selection for each user. By doing optimization iteratively,...
This paper presents a performance evaluation of enhanced link adaptation techniques for MIMO-OFDM systems with imperfect feedback and channel estimation. In the link-level simulations, the channel modeling is based on MIMO channel measurements in line-of-sight and non line-of-sight scenarios. An adaptation process that switches between beamforming, diversity and multiplexing modes in combination with...
In this paper we first introduce a fixed beamfroming (BF) technique for orthogonal frequency division multiplexing (OFDM) systems. The basic idea of beamforming is that the phase of the transmitted signal is shifted according to the user direction, while at the receiver side, the phase shifting performs again to maximize the received signal-to-noise ratio (SNR). We also propose a discrete Fourier...
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