Patent
Method and apparatus for embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same
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TLDR
In this paper, the synchronization frame and the cell search preamble are used to estimate time and frequency synchronization in an OFDMA-based cellular system, and a cyclic prefix is used to track the frequency, the synchronization preambles are used for symbol synchronization, and the search cell is used for searching cells.Abstract:
In an OFDMA-based cellular system, a frame of a downlink signal includes a common slot and traffic slots. The common slot includes a synchronization preamble and a cell search preamble. The synchronization preamble has a structure for synchronizing time and frequency, and the cell search preamble has a cell search structure. The traffic slot includes pilot symbols provided on the time and frequency axes. A cyclic prefix is used to estimate initial symbol synchronization, and the initial symbol synchronization and the synchronization preamble are used to synchronize the frame. The synchronization frame and the cell search preamble are used to estimate time and frequency synchronization. The cell search preamble is used to search cells. When the initial synchronization is performed, the cyclic prefix is used to track the frequency, the synchronization preamble is used to track symbol synchronization, and the cell search preamble is used to track fine frequency synchronization.read more
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References
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Patent
Random access in a mobile telecommunications system
TL;DR: In this article, the uplink common physical channel (random access channel) frame structure is disclosed with a separate preamble and data portion, which is used by a base station to detect that a mobile station is attempting a random access request.
Journal ArticleDOI
Orthogonal frequency division multiplex synchronization techniques for frequency-selective fading channels
TL;DR: The conclusion is reached that the proposed synchronization techniques result in virtually unimpaired BERs over the range of wideband channels investigated in comparison to a perfectly synchronized system.
Patent
Method and apparatus for efficient synchronization in spread spectrum communications
TL;DR: In this article, a matched filter corresponding to a complementary pair of sequences is used to correlate the received signal with one of the complementary pairs of sequences, and a peak output is detected from the matched filter, and the detected peak was used to generate a timing estimate for synchronizing transmissions between transceivers.
Patent
Synchronization to a base station and code acquisition within a spread spectrum communications system
TL;DR: In this article, the transmission frame within a spread spectrum communications system relating to synchronization code transmission is divided into a plurality of slots, each of which includes a primary (pilot) code cp and a secondary (combined) code cs/lci that includes information identifying or indicative of both a frame timing and a scrambling code for synchronization.
Journal ArticleDOI
Adaptive digital access protocol: a MAC protocol for multiservice broadband access networks
James E. Dail,M.A. Dajer,Chia-Chang Li,Peter Magill,Curtis A. Siller,Kotikalapudi Sriram,Norman Ashton Whitaker +6 more
TL;DR: The authors describe a protocol that can adapt to the changing demands of a mix of synchronous transfer mode (STM) and asynchronousTransfer mode (ATM) applications and efficiently allocate bandwidth to a variety of bursty traffic sources and its performance with respect to throughput, latency, and bandwidth efficiency is examined.