Achievable degrees of freedom region of MIMO relay networks using Detour Schemes

In this paper, we study the degrees of freedom (DoF) of the MIMO relay networks. We start with a general Y channel, where each user has M i antennas and aims to exchange messages with the other two users via a relay equipped with N antennas. Then, we extend our work to a general 4-user MIMO relay ne...

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Bibliographic Details
Main Authors: Zewail, Ahmed A., Nafie, Mohammed, Mohasseb, Yahya, El Gamal, Hesham
Format: Conference Proceeding
Language:English
Subjects:
Antennas
Array signal processing
Educational institutions
MIMO
Relay networks (telecommunications)
Vectors
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Summary:In this paper, we study the degrees of freedom (DoF) of the MIMO relay networks. We start with a general Y channel, where each user has M i antennas and aims to exchange messages with the other two users via a relay equipped with N antennas. Then, we extend our work to a general 4-user MIMO relay network. Unlike most previous work which focused on the total DoF of the network, our aim here is to characterize the achievable DoF region as well. We develop an outer bound on the DoF region based on the notion of one sided genie. Then, we define a new achievable region using the Signal Space Alignment (SSA) and the Detour Schemes. Our achievable scheme achieves the upper bound for certain conditions relating M i 's and N.
ISSN:1550-3607
1938-1883
DOI:10.1109/ICC.2014.6883594