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Authors : Ibrahim Freewan and Aaron Robinson
Abstract :This paper presents a subfamily of quasi-orthogonal space time block codes (QOSTBC), named Exclusive Conjugate (EC-QOSTBC), with full rate, full diversity and simple decoding at the receiver. Our approach estimates feedback constants at the receiver and the transmitter in turn modifies the transmitted symbols based on the estimated constants. This approach is an alternative method to those used in the literature to overcome the challenge of no existing STBC with full diversity and full rate with simple decoding for more than two transmitted antennas. Our simulation results show that the proposed family has better performance in terms of BER-SNR when compared to other codes presented in the literature. Finally, the estimated feedback constants in this work consists of only two real constants
Keywords :MIMO, Alamouti code, STBC, QOSTBC, 5G
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Authors :Ibrahim Freewan; John N. Daigle; Feng Wang
Abstract :: This paper discusses distribution of content to mobile users via small cells (SCs) in 5G. Users may simultaneously access between one and some maximum number of SCs. Files are stored in remote locations as a collection of source symbols and some number of RaptorQ-encoded symbols generated from these source symbols are cached in the SCs. Each file is characterized by the number of encoded symbols required to reconstruct the file at the user equipment and its download preference probability. Users recover the file by downloading a number of encoded symbols slightly larger than the number of source symbols. If a sufficient number of encoded symbols are not available from the SCs, the remainder are backhauled. Presented in this paper is an algorithm of low complexity to maximize the average value of using cache to reduce backhaul. This paper contributes to the literature by presenting an n log n algorithm to solve the optimization problem exactly, extending previous results from constant files size for all files to arbitrary actual files sizes for all files, and extending distribution portions from continuous fractions of files to an integer number of symbols.
Keywords :Content Distribution, 5G Cellular, Small Cells, Raptor Codes, Caching
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