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Code Division Multiple Access or CDMA has its roots in WWII era spread spectrum technology. In this technology, multiple users can transmit the data simultaneously in a channel using the same frequency band and each user is assigned a distinguished code for transmission. CDMA uses spread-spectrum technology to minimize the problems relating to interference in the channel. Different types of codes...
In this paper, we consider spatial-division multiple-access (SDMA) systems with one base station with multiple antennae and a number of single antenna mobiles under noisy limited CSIT feedback. We propose a robust noisy limited feedback design for SDMA systems. Furthermore, we show that despite the noisy feedback, the average system goodput scales as O(nT(1-??)/nT-1(Cfb -log2(Nn))) and O(nT??log2...
In this paper we apply approximate and multiscale entropy metrics to spectrum occupancy data gathered during an extensive measurement campaign. We show that the presented methods can be successfully applied to search for and quantify structures of highly varying complexities and time scales. Although structures can be found they are unfortunately relatively complex and it does not appear to be easy...
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