Efficient Link-to-System level Modeling for Accurate Simulations of MIMO-OFDM Systems

Pauli, Volker; Viering, Ingo; Buchner, C.; Saad, E.; Liebl, G.; Klein, Axel

doi:10.1109/icc.2009.5198975

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…In downlink direction, calculation of the transmission CQI is performed as described in Figure 4. The necessary mapping curves which abstract the link level are generated following [13] and [14]. This CQI value is provided for the scheduler in order to allow intelligent, channel dependent scheduling, taking the conditions of the respective UE into account.…”

Section: Selection Of Transmission Modulation and Coding Scheme (Mcs)mentioning

confidence: 99%

Analysis of an Adaptive Switching Point for LTE TDD by Dynamic System-Level Simulations

Backfrieder

Ostermayer

2015

International Journal of Electronics and Telecommunications

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This paper introduces an LTE system level simulator and presents investigations of scenarios with differently balanced traffic emergence between uplink and downlink as well as inhomogeneous distribution of link direction asymmetry. In the TDD mode of LTE, duplexing is implemented via sharing the time domain between uplink and downlink users. This is done by different switching configurations, which offer varying capacity distributions between downlink and uplink, from a downlink-heavy configuration with 90 percent of the capacity in downlink direction to uplink heavy configurations with 60 percent uplink. We utilize the available capacity perfectly by adjusting the link configuration appropriately to traffic emergence. Performance gains when selecting a configuration appropriate to the arising traffic compared to usage of a static configuration with equally distributed capacity are investigated. In case of different configurations, additional interference can occur in neighbored cells due to distinct communication direction at the same time. We clarify the differences between these scenarios and quantify the gains and losses when the switching point between uplink and downlink is variable.

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Section: Selection Of Transmission Modulation and Coding Scheme (Mcs)mentioning

confidence: 99%

Analysis of an Adaptive Switching Point for LTE TDD by Dynamic System-Level Simulations

Backfrieder

Ostermayer

2015

International Journal of Electronics and Telecommunications

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“…The effective SINR is then used in conjunction with the precomputed link-level results for the AWGN channel to determine the error indications for the individual transmissions. This efficient link-to-system level modeling [9] allows us to bypass the actual link-level processing such as channel en-/decoding, (de-)modulation, layer (de-) mapping, precoding, and equalization, with minimal complexity during system-level simulations.…”

Section: Introductionmentioning

confidence: 99%

Reproducible LTE uplink performance analysis using precomputed interference signals

Pauli

Nisar

Seidel

2011

EURASIP J. Adv. Signal Process.

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The consideration of realistic uplink inter-cell interference is essential for the overall performance testing of future cellular systems, and in particular for the evaluation of the radio resource management (RRM) algorithms. Most beyond-3G communication systems employ orthogonal multiple access in uplink (SC-FDMA in LTE and OFDMA in WiMAX), and additionally rely on frequency-selective RRM (scheduling) algorithms. This makes the task of accurate modeling of uplink interference both crucial and non-trivial. Traditional methods for its modeling (e.g., via additive white Gaussian noise interference sources) are therefore proving to be ineffective to realistically model the uplink interference in the next generation cellular systems. In this article, we propose the use of realistic precomputed interference patterns for LTE uplink performance analysis and testing. The interference patterns are generated via an LTE system-level simulator for a given set of scenario parameters, such as cell configuration, user configurations, and traffic models. The generated interference patterns (some of which are made publicly available) can be employed to benchmark the performance of any LTE uplink system in both lab simulations and field trials for practical deployments. It is worth mentioning that the proposed approach can also be extended to other cellular communication systems employing OFDMA-like multiple access with frequency-selective RRM techniques. The proposed approach offers twofold advantages. First, it allows for repeatability and reproducibility of the performance analysis. This is of crucial significance not only for researchers and developers to analyze the behavior and performance of their systems, but also for the network operators to compare the performance of competing system vendors. Second, the proposed testing mechanism evades the need for deployment of multiple cells (with multiple active users in each) to achieve realistic field trials, thereby resulting in significant cost (and time) savings in the field trails.

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Performance analysis of Closed and Open loop MIMO in LTE

Ball

Mullner

Lienhart

et al. 2009

2009 European Wireless Conference

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Efficient Link-to-System level Modeling for Accurate Simulations of MIMO-OFDM Systems

Cited by 6 publications

References 4 publications

Analysis of an Adaptive Switching Point for LTE TDD by Dynamic System-Level Simulations

Analysis of an Adaptive Switching Point for LTE TDD by Dynamic System-Level Simulations

Reproducible LTE uplink performance analysis using precomputed interference signals

Performance analysis of Closed and Open loop MIMO in LTE

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