Proceedings ArticleDOI
Baseline E-UTRA Downlink Spectral Efficiency Evaluation
Na Wei,A. Pokhariyal,Christian Rom,Basuki Endah Priyanto,Frank Frederiksen,Claudio Rosa,Troels B. Sorensen,Troels Kolding,Preben Mogensen +8 more
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TLDR
This paper evaluates spectral efficiency performance of the 3GPP Evolved UTRA (E-UTRA) downlink with baseline settings and finds that the adapMIMO scheme has similar performance as SFC in the macrocellular case, it produces about 30% spectral efficiency gain in the microcell scenario.Abstract:
This paper evaluates spectral efficiency performance of the 3GPP Evolved UTRA (E-UTRA) downlink with baseline settings. A detailed link level tool has been developed including the majority of 3GPP E-UTRA link chain processing modules such as time-domain link adaptation and LI HARQ. Since MIMO is an integral part of the new system, we include four basic multiple antenna configurations in the analysis, namely the SISO, 1x2 SIMO, 2x2 SFC and 2x2 BLAST schemes. Since the BLAST is very sensitive to channel estimation error in cell edge, a case denoted as adapMIMO is considered as well, where the SFC is taken as a backup for the BLAST in cell edge. The system bandwidth is fixed at 20 MHz and a Typical Urban channel model is assumed for both macrocell and microcell evaluations. Simulation results show that in macrocell scenario, the spectral efficiency performance gain of SIMO over SISO is up to 54%, while SFC shows an additional gain of 14% over SIMO. Although the adapMIMO scheme has similar performance as SFC in the macrocellular case, it produces about 30% spectral efficiency gain in the microcell scenario.read more
Citations
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Proceedings ArticleDOI
LTE Capacity Compared to the Shannon Bound
Preben Mogensen,Wei Na,Istvan Z. Kovacs,Frank Frederiksen,A. Pokhariyal,Klaus I. Pedersen,Troels Kolding,Klaus Hugl,Markku Kuusela +8 more
TL;DR: An adjusted Shannon capacity formula is introduced, where it is shown that the bandwidth efficiency can be calculated based on system parameters, while the SNR efficiency is extracted from detailed link level studies.
Proceedings ArticleDOI
Dynamic packet scheduling performance in UTRA Long Term Evolution downlink
TL;DR: It is shown that by dividing the packet scheduler into a time domain and a frequency domain and utilizing different algorithms in both domains, the throughput fairness between users can be effectively controlled.
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On the way towards fourth-generation mobile: 3GPP LTE and LTE-advanced
David Martin-Sacristan,Jose F. Monserrat,Jorge Cabrejas-Peñuelas,Daniel Calabuig,Salvador Garrigas,Narcis Cardona +5 more
TL;DR: It is demonstrated that LTE performance does not fulfil the technical requirements established by ITU-R to classify one radio access technology as a member of the IMT-Advanced family of standards.
Self-Optimization of Coverage and Capacity in LTE using Adaptive Antenna Systems
TL;DR: This thesis work provides a detailed analysis of the optimization space of antenna parameters and compares different tilt techniques as well as discusses vertical sectorization as a novel capacity optimization approach.
Proceedings ArticleDOI
Frequency Domain Scheduling for OFDMA with Limited and Noisy Channel Feedback
Klaus I. Pedersen,Guillaume Monghal,Istvan Z. Kovacs,Troels Kolding,A. Pokhariyal,F. Frederiksen,Preben Mogensen +6 more
TL;DR: This study analyzes the downlink OFDMA system level performance for three different channel quality indicator (CQI) reporting schemes and finds that a simple threshold-based CQI scheme provides an attractive trade-off between downlink systemlevel performance and uplink CqI signaling overhead, as compared to using a best-M scheme.
References
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Proceedings ArticleDOI
V-BLAST: an architecture for realizing very high data rates over the rich-scattering wireless channel
TL;DR: This paper describes a wireless communication architecture known as vertical BLAST (Bell Laboratories Layered Space-Time) or V-BLAST, which has been implemented in real-time in the laboratory and demonstrated spectral efficiencies of 20-40 bps/Hz in an indoor propagation environment at realistic SNRs and error rates.
BookDOI
WCDMA for UMTS: Radio Access for Third Generation Mobile Communications
Harri Holma,Antti Toskala +1 more
TL;DR: In this article, the authors provide a complete picture of the Wideband CDMA (Code Division Multiple Access) air interface of the 3rd generation cellular systems - UMTS (Universal Mobile Telecommunications Systems).
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An overview of MIMO communications - a key to gigabit wireless
TL;DR: An overview of MIMO wireless technology covering channel models, performance limits, coding, and transceiver design is provided, in principle, to meet the 1 Gb/s data rate requirement with a single-transmit single-receive antenna wireless system.
Book
WCDMA for UMTS
Harri Holma,Antti Toskala +1 more
TL;DR: In this article, the authors present the key parts of the 3GPP/WCDMA standard and provide guidelines for its efficient use and present network dimensioning and coverage and capacity planning of WCDMA.
Journal ArticleDOI
Implementation of a MIMO OFDM-based wireless LAN system
A. van Zelst,T.C.W. Schenk +1 more
TL;DR: The complete MIMO OFDM processing is implemented in a system with three transmit and three receive antennas, and its performance is evaluated with both simulations and experimental test results.