Carrier frequency synchronization in the downlink of 3GPP LTE

Wang, Qi; Mehlführer, Christian; Rupp, Markus

doi:10.1109/pimrc.2010.5671968

Cited by 55 publications

(28 citation statements)

References 8 publications

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“…The synchronization scheme is similar to the one described in [85], however it is performed at OFDM symbol level instead of at subframe level. The receiver also evaluates the data from control channels such as Physical Downlink Control Channel (PDCCH), Physical Control Format Indicator Channel (PCFICH), Physical hybrid-ARQ Indicator Channel (PHICH) as well as user data contained in the Physical Downlink Shared Channel (PDSCH) and the contents of the PBCH.…”

Section: Lte Physical Layer Link-quality Evaluationmentioning

confidence: 99%

Broadband Access in Complex Environments: LTE on Railway

Briso-Rodríguez

López

Fernandez

et al. 2014

IEICE Trans. Commun.

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SUMMARYThis paper assesses the main challenges associated with the propagation and channel modeling of broadband radio systems in a complex environment of high speed and metropolitan railways. These challenges comprise practical simulation, modeling interferences, radio planning, test trials and performance evaluation in different railway scenarios using Long Term Evolution (LTE) as test case. This approach requires several steps; the first is the use of a radio propagation simulator based on ray-tracing techniques to accurately predict propagation. Besides the radio propagation simulator, a complete test bed has been constructed to assess LTE performance, channel propagation conditions and interference with other systems in real-world environments by means of standard-compliant LTE transmissions. Such measurement results allowed us to evaluate the propagation and performance of broadband signals and to test the suitability of LTE radio technology for complex railway scenarios.

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Section: Lte Physical Layer Link-quality Evaluationmentioning

confidence: 99%

Broadband Access in Complex Environments: LTE on Railway

Briso-Rodríguez

López

Fernandez

et al. 2014

IEICE Trans. Commun.

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“…The cyclic prefix in OFDM symbols is just the copy of the last L symbols appended to the original symbol. Equation (6), derived in van de Beek et al [1997], is extended for one LTE subframe in Wang et al [2010] and is expressed in Equation (3) as follows for a single antenna system, where r is the received symbols, Nf is the OFDM symbol number within a subframe, and Ng in the length of the cyclic prefix.…”

Section: Fractional Carrier Frequency Offset Estimationmentioning

confidence: 99%

Transport triggered architecture to perform carrier synchronization for LTE

Anjum

Ali

Pitkänen

et al. 2014

ACM Trans. Embed. Comput. Syst.

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In this article implementation of carrier frequency offset estimate for 20MHz LTE baseband processing is discussed. LTE (Long Term Evolution) is a wireless communication standard that makes use of some innovative techniques to gain very high data rates (>100Mbps). This goal for such a high throughput also imposes design challenges for the industry and academia such as in the case of handheld mobile devices where the power budget is very limited. Implicitly high throughput means we need more computation power and more energy. On the other hand industry is also struggling for a flexible hardware solution, or software defined a radio (SDR), to amortize the huge cost of required hardware changes as the wireless standards have kept evolving. Design innovations are now needed to confront those challenges of low power and flexible design without changing the hardware. The implementation is made on Transport Triggered Architecture (TTA), which is a unique concept in computer architecture design, based on the single instruction, "MOVE". The power consumption of the architecture when synthesized on 180nm technology at 180MHz and 1.8V is 18.39mW. The total area occupied excluding memory is 0.6mm 2 . The proposed TTA solution has been compared with, a more ASIC (application specific integrated circuits), like ASIP (application specific instruction processor) solution and a coprocessor accelerator-based solution. The proposed solution is more flexible: easily programmable due to high level language support, easily scalable, and still efficient in energy consumption needed to complete the CFO (carrier frequency offset) estimation task. Because of these attractive characteristics, TTA is also a potential candidate for SDR platforms.

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“…Given this receiver structure, the simulator allows the investigation of various aspects, such as frequency synchronization [45], channel estimation [44], or interference awareness [46].…”

Section: ) Channel Modelmentioning

confidence: 99%

“…In LTE, such a network consists of a multitude of eNodeBs that cover a specific area in which many mobile terminals are located and/or moving around. While simulations of individual physical layer links allow for the investigation of MIMO gains, AMC feedback, modeling of the channel code, and retransmissions [13,44,45,50,56], it is not possible to reflect the effects of cell planning, scheduling, or interference in a large scale with dozens of eNodeBs and hundreds of users. Simply performing physical layer simulations of the radio links between all terminals and base-stations is unfeasible for system level investigations because of the vast amount of computational power required.…”

Section: A Structure Of the Simulatormentioning

confidence: 99%

The Vienna LTE simulators - Enabling reproducibility in wireless communications research

Mehlführer¹,

Ikuno²,

Šimko³

et al. 2011

EURASIP J. Adv. Signal Process.

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247

136

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In this article, we introduce MATLAB-based link and system level simulation environments for UMTS Long-Term Evolution (LTE). The source codes of both simulators are available under an academic non-commercial use license, allowing researchers full access to standard-compliant simulation environments. Owing to the open source availability, the simulators enable reproducible research in wireless communications and comparison of novel algorithms. In this study, we explain how link and system level simulations are connected and show how the link level simulator serves as a reference to design the system level simulator. We compare the accuracy of the PHY modeling at system level by means of simulations performed both with bit-accurate link level simulations and PHY-model-based system level simulations. We highlight some of the currently most interesting research questions for LTE, and explain by some research examples how our simulators can be applied.

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Carrier frequency synchronization in the downlink of 3GPP LTE

Cited by 55 publications

References 8 publications

Broadband Access in Complex Environments: LTE on Railway

Broadband Access in Complex Environments: LTE on Railway

Transport triggered architecture to perform carrier synchronization for LTE

The Vienna LTE simulators - Enabling reproducibility in wireless communications research

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