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Recently massive multi-input multi-output (MIMO) techniques have attracted growing research interest. However, most existing works assume centralized control, which may involve a heavy overhead as the number of users also becomes massive. In this paper, we focus on random-access massive MIMO systems. We first analyze the performances of two conventional schemes widely used in massive MIMO, and derive...
Modulation classification is a technique to achieve blind estimation of modulation types. Thereby, signaling overhead can be reduced or equivalently spectrum efficiency can be improved. However, the benefit is limited in coded systems, since the code rate information have to be signaled anyway. To fulfill the requirement of higher spectrum efficiency in 5th generation (5G) systems, a method of constellation...
In this paper, we investigate the theoretical per-node transmission limit of hybrid wireless networks over fast fading channels. We first formulate a hybrid wireless network model, in which a wired network of base stations is deployed to support long-range communications between wireless nodes. Two types of transmission mode in hybrid wireless network, the so called intra-cell transmission mode and...
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