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4G: LTE/LTE-Advanced for Mobile Broadband

TL;DR: In this article, the authors focus on LTE with full updates including LTE-Advanced to provide a complete picture of the LTE system, including the physical layer, access procedures, broadcast, relaying, spectrum and RF characteristics, and system performance.
Abstract: Based on the bestseller "3G Evolution - HSPA and LTE for mobile broadband" and reflecting the ongoing success of LTE throughout the world, this book focuses on LTE with full updates including LTE-Advanced to provide a complete picture of the LTE system. Overview and detailed explanations are given for the latest LTE standards for radio interface architecture, the physical layer, access procedures, broadcast, relaying, spectrum and RF characteristics, and system performance. Key technologies presented include multi-carrier transmission, advanced single-carrier transmission, advanced receivers, OFDM, MIMO and adaptive antenna solutions, advanced radio resource management and protocols, and different radio network architectures. Their role and use in the context of mobile broadband access in general is explained. Both a high-level overview and more detailed step-by-step explanations of the LTE/LTE-Advanced implementation are given. An overview of other related systems such as GSM/EDGE, HSPA, CDMA2000, and WIMAX is also provided. This book is a 'must-have' resource for engineers and other professionals in the telecommunications industry, working with cellular or wireless broadband technologies, giving an understanding of how to utilize the new technology in order to stay ahead of the competition. The authors of the book all work at Ericsson Research and have been deeply involved in 3G and 4G development and standardisation since the early days of 3G research. They are leading experts in the field and are today still actively contributing to the standardisation of LTE within 3GPP. Includes full details of the latest additions to the LTE Radio Access standards and technologies up to and including 3GPP Release 10Clear explanations of the role of the underlying technologies for LTE, including OFDM and MIMO Full coverage of LTE-Advanced, including LTE carrier aggregation, extended multi-antenna transmission, relaying functionality and heterogeneous deploymentsLTE radio interface architecture, physical layer, access procedures, MBMS, RF characteristics and system performance covered in detail
Citations
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Proceedings Article
Karl Werner1, Henrik Asplund1, Daniel Figueiredo1, Niklas Jaldén1, Bjorn Halvarsson1 
31 Dec 2012
TL;DR: In this article, the potential link performance gains obtained with up to 8×8 MIMO transmissions as standardized in 3GPP LTE Release 10 have been evaluated in an indoor measurement campaign using a testbed implementation.
Abstract: The potential link performance gains obtained with up to 8×8 MIMO transmissions as standardized in 3GPP LTE Release 10 have been evaluated in an indoor measurement campaign using a testbed implementation. For well-separated antennas, the results show increasing downlink throughput when increasing the number of transmit and receive antennas, up to a median throughput of 335 Mbps for an 8×8 MIMO configuration on a 20 MHz carrier. A similar and only slightly smaller throughput is achieved when using a compact UE array of a size that is more reasonable for a consumer device implementation.

13 citations

Proceedings ArticleDOI
20 Jul 2016
TL;DR: This work introduces a modified version of the orthogonal frequency division multiplexing (OFDM) signal by truncating OFDM symbols in the time domain with short truncation length, so that signals can be recovered even with truncated symbol transmission.
Abstract: This work introduces a modified version of the orthogonal frequency division multiplexing (OFDM) signal by truncating OFDM symbols in the time domain. Sub-carriers are no longer orthogonally packed in the frequency domain as time samples are only partially transmitted, leading to improved spectral efficiency. In this work, mathematical expressions are derived for the newly proposed Truncated OFDM (TOFDM) signal, followed by interference analysis and performance comparisons. We also consider optimal and practical decoder architectures. Results from a Sphere Decoder-based decoder indicate that truncation length can significantly affect the error performance. With short truncation length, using a purpose designed detector, signals can be recovered even with truncated symbol transmission.

13 citations


Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."

  • ...Orthogonality in OFDM is a crucial factor in its successful operation: loss of orthogonality leads to interference and deterioration in bit error rate [1]....

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Proceedings ArticleDOI
10 Jul 2016
TL;DR: By using the proposed method, inter-cell interference in asynchronous multi-cellular VLC could be effectively mitigated with only trivial frequency guard.
Abstract: Inter-cell interference hinders multi-cellular transmission in visible light communication (VLC). We proposed a subcarrier allocation-based cell partitioning to avoid co-channel interference without a large frequency guard and additional RF components. In asynchronous environment, the interference remains due to a timing offset between cells even in the subcarrier allocation-based cell partitioning. To mitigate the remaining interference, we employed cyclic prefix (CP) extension and filter bank based multicarrier (FBMC), which could improve performance and it was experimentally demonstrated in this paper. By using the proposed method, inter-cell interference in asynchronous multi-cellular VLC could be effectively mitigated with only trivial frequency guard.

13 citations


Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."

  • ...Orthogonal frequency division multiplexing (OFDM) is a highly spectral efficient parallel transmission technique, which is a standard of long-term-evolution-advanced (LTE-A) [3]....

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Proceedings ArticleDOI
20 Mar 2016
TL;DR: This work studies symbol-level downlink beamforming problems based on noise robustness and outage probability, respectively, subject to power constraints and provides an analytic symbol error rate (SER) upper bound of the worst user by solving the outage probability-based problem.
Abstract: Quality of service (QoS) is commonly measured in terms of signal to interference plus noise ratio (SINR), where multiuser interference is mitigated in order to improve the performance. As opposed to conventional suppression, interference can be exploited constructively to enhance the desired signal. With the aid of channel state information (CSI) at the transmitter and data information, we study symbol-level downlink beamforming problems based on noise robustness and outage probability, respectively, subject to power constraints. We further show that an equivalence relationship between the noise robustness and outage probability symbol-level downlink beamforming problems can be obtained. Finally, we provide an analytic symbol error rate (SER) upper bound of the worst user by solving the outage probability-based problem. Our simulations demonstrate that the proposed techniques provide substantial performance improvements over conventional downlink beamforming techniques.

13 citations


Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."

  • ...Index Terms— Downlink beamforming, robust design, error probability, convex optimization, constructive interference....

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Proceedings ArticleDOI
22 Jun 2015
TL;DR: This paper designs, implements, implement, and experimentally evaluates Concurrent Uplink Control Messages (CUiC), a technique to scale the MU-MIMO control information exchange process and improve the efficiency of 802.11ac-based MU- MIMO networks.
Abstract: Downlink Multi-User MIMO (MU-MIMO) enables the simultaneous spatial sharing of the channel by multiple users to achieve a capacity gain over Single-Input Single-Output (SISO) systems. Unfortunately, the overhead required to enable multi-user MIMO is much higher than the overhead required for single-stream systems. Namely, for K users, collection of channel state information requires K transmission exchanges (i.e., O(K)) between the AP and users. Likewise, the MU-MIMO acknowledgement process also requires the same amount of exchanges, thus reducing the performance gains attained via simultaneous downlink transmission. In this paper, we design, implement, and experimentally evaluate Concurrent Uplink Control Messages (CUiC) to scale the MU-MIMO control information exchange process and improve the efficiency of 802.11ac-based MU-MIMO networks. Our key technique is the design of new channel sounding and acknowledgement mechanisms that enable multiple users to transmit their reverse-direction control messages (i.e., beamforming reports and acknowledgments) concurrently to the AP, in O(1) transmission slots. We implement CUiC and perform an extensive set of experiments and demonstrate throughput gains of more than 100% compared to 802.11ac.

13 citations