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This chapter provides an overview of the OpenAirInterface (OAI) both in terms of its hardware and software elements and its usage in cognitive wireless networking applications based on long term evolution (LTE) technology. In particular, we show a design of a cognitive radio systems in the LTE framework that enables the deployment of cognitive radio in licensed bands, with no hardware modification...
To satisfy the demand of future mobile networks, they will need to make use of as much spectrum as possible. However, spectrum for wireless communication is scarce, fragmented, and the rules for its use are very heterogeneous. This chapter describes the state of the art in LTE‐Advanced aggregation technologies, which are an effective means to exploit a large amount of spectrum. Further, we also show...
When several antennas are present at both the transmitter and the receiver the system is said to be Multiple‐Input Multiple‐Output (MIMO).
MIMO systems can improve the link performance by exploiting the spatial domain when communicating with a single user or with multiple users. Single‐user and multi‐user MIMO (SU‐MIMO and MU‐MIMO) techniques are based on a few fundamental principles, which aim at...
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