Theme 1 : Non Orthogonal Spectrum Sharing



Use of orthogonal communication techniques are very common in present wireless communication systems. One of the prominent example of orthogonal communication system is OFDM which uses orthogonality in frequency domain. The attractive thing about orthogonal communication techniques is the simplicity of the receiver. However, when using the orthogonal communication systems it may happen that the capacity region has not been utilized fully. Thus, there is always a chance to implement a non-orthogonal communication systems which improves the rate over orthogonal communication systems. However, this increases the receiver complexity as well as the resource allocation problem. Many non-orthogonal techniques are present in the literature. We study the power domain non-orthogonal techniques in our group. We are specifically interested in developing low complex, optimal resource allocation algorithms for this kind of system.

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