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This paper looks at regulation for enhanced forms of carrier aggregation. The first objective of the paper is to provide a vision for carrier aggregation that goes beyond LTE-Advanced. Carrier aggregation as currently defined is envisaged as the aggregation of blocks from spectrum resources which are statically assigned to a mobile network operator. In the enhanced vision dynamic assignments, shared...
Enabling flexible spectrum access (FSA) in existing wireless networks is challenging due to the limited spectrum programmability - the ability to change spectrum properties of a signal to match an arbitrary frequency allocation. This paper argues that spectrum programmability can be separated from general wireless physical layer (PHY) modulation. Therefore, we can support flexible spectrum programmability...
In cognitive radio systems, the available frequency bands are usually non-contiguous, which may cause impact on the spectrum utilization efficiency (SUE).When the receiver has a limited sampling capability, the aliasing phenomenon may cause interference among the signals at different frequency points, thus causing the loss of channel capacity. Information theoretic analysis is carried out to quantify...
In dynamic spectrum access (DSA) networks, users are allowed to access the available spectrum while keeping neighboring transmissions not interfered. In this demonstration, we show how the available bandwidth can be used efficiently while at the same time keeping the interference power level below a certain threshold. This is done through the use of the constellation expansion technique for orthogonal...
Spectrum security and enforcement is one of the major challenges that need to be addressed before cognitive radios (CR) can be widely deployed for opportunistic spectrum sharing. One of the mechanisms needed to carry out spectrum enforcement is the authentication or identification of transmitters. We propose a novel scheme for authenticating transmitters at the physical layer called partial response...
In this paper, we study the coexistence issues of LTE systems operating in the TV white spaces. The study includes a proposal for an appropriate system design as well as a discussion on the LTE system's self-configurability to avoid potential interference to other systems when the resource allocation is made flexible. This is evaluated in terms of achievable PHY-layer throughput and block error rates...
Creating a cognitive Long Term Evolution (LTE) network on an arbitrary frequency requires an LTE specific classifier. This paper explains a novel LTE signal classification method that requires no a priori information about the signal parameters including its frequency. The classification method consists of multiple steps. The first step is using a correlation-based discriminator which exploits the...
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