Book•
4G: LTE/LTE-Advanced for Mobile Broadband
21 Mar 2011-
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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15 Apr 2018
TL;DR: A rich-parameter based simulation on RACH is performed to identify the procedure bottlenecks and proposed improvements to the RACH procedure and to PDCCH.
Abstract: With the increasing number of devices performing Machine-Type Communications (MTC), mobile networks are expected to encounter a high load of burst transmissions. One bottleneck in such cases is the Random Access Channel (RACH) procedure, which is responsible for the attachment of devices, among other things. In this paper, we performed a rich-parameter based simulation on RACH to identify the procedure bottlenecks. A finding from the studied scenarios is that the Physical Downlink Control Channel (PDCCH) capacity for the grant allocation is the main limitation for the RACH capacity rather than the number of Physical Random Access Channel (PRACH) preambles. Guided by our simulation results, we proposed improvements to the RACH procedure and to PDCCH.
5 citations
Cites methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...To send data over PDSCH, the UE must be scheduled, which means that a downlink assignment control message must be sent over PDCCH by the eNB [7]....
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TL;DR: A joint spectral precoding scheme is developed for OOB power reduction by using the matrix operations of orthogonal projection and singular value decomposition and an algorithm is proposed that designs the precoding matrix under receive performance constraint and is converted to matrix condition number constraint in practice.
Abstract: Orthogonal frequency division multiplexing (OFDM) is a promising technique for dynamic spectrum access due to flexibility in spectrum shaping. However, out-of-band (OOB) power radiation of OFDM introduces significant interference to adjacent users. This is a serious problem in cognitive radio networks, which affects the secondary system to access the instantaneous spectrum hole. Existing methods either do not effectively reduce OOB power leakage or introduce significant bit-error-rate deterioration at the receiver. In this paper, a joint spectral precoding scheme is developed for OOB power reduction by using the matrix operations of orthogonal projection and singular value decomposition. We also propose an algorithm that designs the precoding matrix under receive performance constraint, which is then converted to matrix condition number constraint in practice. This method achieves the desirable spectrum envelope and receive performance by selecting zero-forcing frequencies. Simulation results show that OOB power decreases significantly by the proposed scheme under condition number constraint.
5 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...In practice, typically of the order of 10% guard-band is needed for an OFDM signal in the long term evolution (LTE) system [4]....
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...The number of the subcarriers is 300 N in 5 MHz bandwidth [4]....
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08 Jan 2018
TL;DR: A Hybrid PAPR reduction technique SCUFMC have been proposed using SLM (Selective Mapping) and Clipping and simulation results show that hybrid technique provides better P APR reduction as compared with conventional SLM and clipping techniques.
Abstract: Universal filter multi carrier (UFMC) is one of the promising multi carrier modulation techniques for next generation wireless communication systems. UFMC seems to be most attractive because it provides better sub carrier separation like FBMC (Filer Bank Multi Carrier) and less complexity like OFDM (Orthogonal Frequency Division Multiplexing). But this technique suffers from limitation of higher Peak to Average Power Ratio (PAPR). In this paper a Hybrid PAPR reduction technique SCUFMC have been proposed using SLM (Selective Mapping) and Clipping. The performance of proposed technique is evaluated for various design parameters including filter length, FFT size and Bits per sub carrier. The simulation results show that hybrid technique provides better PAPR reduction as compared with conventional SLM and clipping techniques.
5 citations
18 Dec 2014
TL;DR: An easy and advanced approach for extraction of the Volterra kernels are presented, which are derived from the parameters of a feed-forward time delay neural network with a suitable activation function.
Abstract: In wireless communication systems the amplifier non-linear distortion problems are extremely challenging. The linearization techniques based on behavioral models of amplifiers, seem to be very promising, therefore developing a suitable non-linear model is of the crucial importance. A rigorous approach for non-linear modeling is using the of Volterra series, however the calculation of the Volterra coefficients is a complex and time-consuming task. In this paper, an easy and advanced approach for extraction of the Volterra kernels will be presented. The third order Volterra kernels are derived from the parameters of a feed-forward time delay neural network with a suitable activation function.
5 citations
01 Dec 2018
TL;DR: A new scheduling algorithm is proposed and compared with traditional algorithms are Round Robin and Proportional Fair to find the best way video codec to transfer video data with the best quality and more users.
Abstract: LTE-advanced is an emerging and promising technology to produce mobile net access to next-generation transmission services such as voice and video. Advance Video compression technology is High-efficiency video coding (HEVC) that is providing high-definition video (HD), Ultra-High-definition (UHD) and 4K for clients with video traffic designed to denote the majority of data flow in the mobile system, providing users with a quality of experience (QoE) in advance network. This paper has two main objectives. The first aim is to propose a new scheduling algorithm and compare it with traditional algorithms are Round Robin and Proportional Fair. The second objective is to evaluate the two modern video coding standards AVC and HEVC over LTE advanced system, to find the best way video codec to transfer video data with the best quality and more users. According to the results obtained, the proposed algorithm achieves more throughput than from other algorithms. The paper result also can be concluded that video HEVC can be used efficiently in low bandwidth surroundings. HEVC offers savings in the average bit rate of 47.4% and 40.8% relation to AVC.
5 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...One of the most aims for LTE evolution is to supply the informatics based mostly services to people on mobile devices with higher Quality of service (QoS) [4]....
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