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This paper investigates the design of physical-layer multicasting in the cellular downlink systems, where antennas at a base station are used to transmit a common signal to multiple single-antenna users. The central design problem of the physical multicasting is the search of the optimal beamforming vector that maximizes the multicast rate and has been known as an NP-hard problem in the literature...
In this paper, we present a pilot design for an OFDM cellular system based on Costas arrays. The design provides pilot symbols for both common and dedicated pilots for MIMO transmission. The pilot symbols are designed so that pilots from different cells intersect minimally. The design results in a large number of available distinct pilot symbol patterns with minimally overlapping resource elements...
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