A New Perspective on the Initial Uplink Synchronization Problem
| Autor: | Mashud Hyder, Kaushik Mahata |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
General Computer Science
Computer science Orthogonal frequency-division multiplexing multi-user detection 0211 other engineering and technologies 02 engineering and technology Interference (wave propagation) Synchronization uplink synchronization Telecommunications link 0202 electrical engineering electronic engineering information engineering General Materials Science Detection theory sinusoidal codes 021103 operations research Detector General Engineering 020206 networking & telecommunications Propagation delay code design low complexity algorithms Frequency domain Carrier frequency offset LTE random access lcsh:Electrical engineering. Electronics. Nuclear engineering Algorithm lcsh:TK1-9971 |
| Zdroj: | IEEE Access, Vol 8, Pp 212258-212279 (2020) |
| ISSN: | 2169-3536 |
| Popis: | We explore the frequency domain properties of the signal model associated with the initial uplink synchronization (IUS) problem, and provide some new insights. We show that the adverse effects of carrier frequency offset (CFO) are confined in a small region in the frequency domain. We present a new code design approach that avoids the above mentioned region to cancel the adverse effects of CFO. In this design the codes of different users occupy mutually disjoint intervals on the frequency axis. In this way we minimize the interference between different codes, and thereby, allow considerably large number of simultaneous IUS users in the system. For the proposed codes, we design a simple energy detector. This detector relies on classical results from statistical detection theory. We also propose a simple timing offset estimation technique, which requires us to locate the maximum in a periodogram. The resulting detection-estimation algorithms are simple, non-iterative, fast and accurate. The utility of the proposed design is illustrated using numerical simulation results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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