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In this paper, an LFM-based random access preamble (RAP) for underwater acoustic cellular systems is proposed. After showing that the conventional RAP used in LTE systems is not appropriate for underwater acoustic cellular systems, a suitable RAP, robust to Doppler effect, is proposed to detect the identity of underwater equipment/node (UE) and estimate the time delay between a UE and an underwater...
In this paper, a new cell selection technique is proposed for millimeter-wave (mm-wave) considering hybrid beamforming structure in data transmission stage. In order to reduce processing time for channel estimation, cell and beam synchronization signals (CBSS) are proposed which are simultaneously transmitted from multiple beams. It is shown by simulation that the proposed technique with the CBSS...
A small-cell network (SCN) constructed by splitting a macro-cell into numerous small cells using an active antenna array system is studied. A synchronization signal appropriate for the SCN, virtually generated by a base station (BS) with 3D beamforming, is proposed for efficient handover in SCNs. The virtual cell synchronization signal (VCSS) carries a macro-cell ID (MCID) and virtual- cell ID (VCID)...
The beam training protocol in millimeter-wave cellular systems requires a long processing time that is proportional to the product of the number of Tx beams, number of Rx beams, and number of neighbor base stations. In this paper, a preamble design technique that can significantly reduce the processing time for beam training in an orthogonal-frequency-division-multiplexing-based cellular system is...
An efficient handover measurement technique is proposed for millimeter-wave (mm-wave) cellular systems with directional antenna beams. Using the beam synchronization signal (BSS) carrying the cell ID and the beam ID in a hierarchal manner, handover events (interbeam handover and intercell handover) are distinguished at the physical layer. The proposed signal metrics are shown to be effective in detecting...
In this paper, a new preamble design technique that can increase the number of cell IDs (CIDs) and beam IDs (BIDs) significantly is proposed, using a preamble sequence constructed by a combination of two Zadoff-Chu (ZC) sequences. An efficient technique for the CID and BID (CBID) detection is also described for the proposed preamble. It is shown by simulations using a simple model of an mmWave cellular...
In this paper, a beamforming and cell searching method is proposed for a mobile station (MS) with antenna array to compensate the high attenuation in a millimeter wave (mm-wave) OFDM-based cellular systems. A cell searching and direction-of-arrival (DoA) estimation method is proposed for a multipath environment, even with the existence of the symbol timing offsets (STOs) and carrier frequency offsets...
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