Transmit Antenna Subset Selection for Downlink MIMO Systems

Abstract

This paper discusses transmit antenna subset selection schemes for downlink closed-loop multiple-input multiple-output (MIMO) systems in multicell environments. A simplified cooperative scheme is proposed to increase the sum of the mutual information of the links in all cells. The proposed simplified-cooperative scheme is realistic in that it only utilizes a limited amount of information from adjacent links, while the conventional cooperative scheme requires a large amount of information such as channel state information and MIMO transmit configurations of adjacent links. In spite of the use of a limited amount of information, the proposed scheme provides almost 90 percent of the average mutual information provided by the cooperative scheme. Furthermore, the proposed scheme shows significant enhancements over the competitive scheme which does not consider the effects of antenna subset selection on the performance of adjacent links.

A novel uplink MIMO transmission scheme in a multicell environment

“…In [6], an optimal MIMO transmission strategy was studied in a multicell scenario when the channel state information (CSI) is not available at the transmitter. For the case when the CSI is available at the transmitter, a transmit antenna subset selection was proposed in [7], and precoding schemes were proposed in [8] and [9]. The precoding scheme in [8] attempts to maximize the achievable rate of the own cell without accounting for the interference caused to the other cells, and thus fails to maximize the total achievable rate.…”

Finite Element Analysis and Optimization of Deformation Behavior for Spur Gear Warm Forging Process

“…It has important theoretical values and industrial prospects to study the deformation mechanism for the precision forging of spur gear. For the precision forging of spur gear forge, a lot of researches were carried out on the deformation mechanism of the forging, and offered the detail analysis results [2][3]. At present, there is mainly three following processing: completely closed-die forging, moving-die forging and central divided flow forging.…”

Interference-Aware Decentralized Precoding for Multicell MIMO TDD Systems

“…Recently, there has been increasing interest in the effective use of multiple antennas in a multicell environment [5]- [9]. Due to mutual interference among cells, performance features of MIMO in a multicell environment are quite different from those in a single cell environment [5]- [7]. For example, spatial multiplexing gain significantly decreases when MIMO is employed in a multicell environment [5].…”

“…For the case when the CSI is available at the transmitter, a transmit antenna subset selection was proposed in [7], and precoding schemes were proposed in [8] and [9]. The precoding scheme in [8] attempts to maximize the achievable rate of the own cell without accounting for the interference caused to the other cells, and thus fails to maximize the total achievable rate.…”