An Introduction to Spread-Spectrum Communications
An Introduction to Spread-Spectrum Communications
NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Dynamic Spectrum Access with QoS and Interference Temperature Constraints
IEEE Transactions on Mobile Computing
Cognitive Mesh Network Under Interference from Primary User
Wireless Personal Communications: An International Journal
Achievable rates and scaling laws for cognitive radio channels
EURASIP Journal on Wireless Communications and Networking - Cognitive Radio and Dynamic Spectrum Sharing Systems
Cognitive Multiple Access Via Cooperation: Protocol Design and Performance Analysis
IEEE Transactions on Information Theory
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There are two main challenges for cognitive underlay transmission in a host channel. The first challenge is how to assign a host channel efficiently among a set of cognitive channel applicants such that primary users perceive no harmful interference. Further, the second challenge is how to achieve a good capacity under high power signal from primary transmitter of the host channel. In this paper, we propose a primary interference suppression technique for cognitive underlay transmission in a host channel by using direct sequence spread spectrum. We show that cognitive users can efficiently suppress high power signal from a primary base station by using adequate spreading factors. Further, we propose an adaptive cognitive underlay channel assignment (ACUCHA) algorithm in a host channel for an ad hoc cognitive network which is overlaid with a primary cell. We show that by using the proposed primary interference suppression in cognitive links the proposed secondary channel assignment algorithm achieves 261.14 Mbps capacity when there are 100 cognitive channel applicants and spreading factor is 100 . Also, we show that the achieved capacity is gained without producing harmful interference temperature in the host channel and perceptible interference in adjacent channels.