This paper considers a multi-cell multiple antenna system with precoding used at the base
stations for downlink transmission. Channel state information (CSI) is essential for precoding …

Traditional approaches in the analysis of downlink systems decouple the precoding and the
channel estimation problems. However, in cellular systems with mobile users, these two …

The impact of quantized channel direction information (CDI) on the achievable secrecy rate
is studied for multiple antenna wiretap channels. By assuming that the eavesdropper's …

Accurate channel direction information is essential to achieve considerable capacity gains in
multiple-input multiple-output (MIMO) wireless communication systems. Limited feedback …

Femtocells that are installed in existing macrocellular networks form a two-tiered
heterogeneous network, yielding an interference problem between the two layers. How we …

In this paper, we propose transmit processing techniques based on novel switched
interleaving, chipwise linear precoding, and limited feedback for both downlink and uplink …

This paper is concerned with the advantages of multi-user concurrent transmission in
multiple-input multiple-output (MIMO) systems with rate constraints. We first study a …

We analyze the physical layer security of a communication scheme with a multiple antenna
legitimate transmitter, employing transmit antenna selection (TAS), and a single antenna …

Opportunistic beamforming is a promising technique for downlink channels in cellular
systems. When opportunistic beamforming is to support multiple users at a time, it is …

In this paper, we propose a practical interference alignment technique based on an
opportunistic user selection in a three-user MIMO interference channel where no information …