Abstract
OpenAirInterface is an experimental open-source real-time hardware and software platform for experimentation in wireless communications and signal processing. With the help of OpenAirInterface, researchers can demonstrate novel ideas quickly and verify them in a realistic environment. Its current implementation provides a full open-source software modem comprising physical and link layer functionalities for cellular and mesh network topologies. The physical (PHY) layer of the platform targets fourth generation wireless networks and thus uses orthogonal frequency division multiple access (OFDMA) together with multiple-input multiple-output (MIMO) techniques. The current hardware supports 5 MHz bandwidth and two transmit/receive antennas. The media access (MAC) layer of the platform supports an abundant two-way signaling for enabling collaboration, scheduling protocols, as well as traffic and channel measurements. In this paper, we focus on the mesh topology and show how to implement a single-frequency mesh network with OpenAirInterface. The key ingredients to enable such a network are a dual-stream MIMO receiver structure and a distributed network synchronization algorithm. We show how to implement these two algorithms in real-time on the OpenAirInterface platform. Further more, we provide results from field trials and compare them to the simulation results.
Highlights
The design and implementation of generation wireless networks is a very challenging task
In this paper we focus on the mesh topology and show how to implement a single-frequency mesh network with OpenAirInterface
In subsection II-B we describe the basic organization of the OpenAirInterface software components
Summary
The design and implementation of generation wireless networks is a very challenging task. This paper presents the Eurecom testbed OpenAirInterface, which is an experimental real-time, open-source hardware and software platform for future wireless networks. OpenAirInterface features an open-source software modem written in C comprising physical and link layer functionalities for cellular and mesh network topologies This software modem can be used either for extensive computer simulations using different channel models or it can be used for real-time operation. Most of the testbeds that provide both physical and link layer functionalities (like OpenAirInterface) are either based on the Universal Software Radio Peripheral (USRP) from Ettus Research [6] together with the GNU software radio [7] or the wireless open-access research platform (WARP) from Rice University [8]. E denotes expectation, and CN (m, C) denotes a multivariate proper complex normal distribution with mean vector m and covariance matrix C
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