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Journal ArticleDOI

LTE-advanced: next-generation wireless broadband technology [Invited Paper]

01 Jun 2010-IEEE Wireless Communications (IEEE Press)-Vol. 17, Iss: 3, pp 10-22
TL;DR: An overview of the techniques being considered for LTE Release 10 (aka LTEAdvanced) is discussed, which includes bandwidth extension via carrier aggregation to support deployment bandwidths up to 100 MHz, downlink spatial multiplexing including single-cell multi-user multiple-input multiple-output transmission and coordinated multi point transmission, and heterogeneous networks with emphasis on Type 1 and Type 2 relays.
Abstract: LTE Release 8 is one of the primary broadband technologies based on OFDM, which is currently being commercialized. LTE Release 8, which is mainly deployed in a macro/microcell layout, provides improved system capacity and coverage, high peak data rates, low latency, reduced operating costs, multi-antenna support, flexible bandwidth operation and seamless integration with existing systems. LTE-Advanced (also known as LTE Release 10) significantly enhances the existing LTE Release 8 and supports much higher peak rates, higher throughput and coverage, and lower latencies, resulting in a better user experience. Additionally, LTE Release 10 will support heterogeneous deployments where low-power nodes comprising picocells, femtocells, relays, remote radio heads, and so on are placed in a macrocell layout. The LTE-Advanced features enable one to meet or exceed IMT-Advanced requirements. It may also be noted that LTE Release 9 provides some minor enhancement to LTE Release 8 with respect to the air interface, and includes features like dual-layer beamforming and time-difference- of-arrival-based location techniques. In this article an overview of the techniques being considered for LTE Release 10 (aka LTEAdvanced) is discussed. This includes bandwidth extension via carrier aggregation to support deployment bandwidths up to 100 MHz, downlink spatial multiplexing including single-cell multi-user multiple-input multiple-output transmission and coordinated multi point transmission, uplink spatial multiplexing including extension to four-layer MIMO, and heterogeneous networks with emphasis on Type 1 and Type 2 relays. Finally, the performance of LTEAdvanced using IMT-A scenarios is presented and compared against IMT-A targets for full buffer and bursty traffic model.
Citations
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Book ChapterDOI
27 Aug 2012
TL;DR: It is shown that such a combination of LTE technology and MU-MIMO system, based on multi-beam adaptive antennas, can significantly increase capacity and spectral efficiency of each channel, and finally, for a whole system, during the multiple access deployment, as well as can fully mitigate multiplicative noises occurring in terrestrial built-up environments.
Abstract: In this work, we put a question on integration of the advanced LTE technology and multiple-input multiple-output (MIMO) system for multi-user (MU) multiple access deployment. We analyze such an integrated network based on multi-beam adaptive antennas application for the purposes of increase of spectral efficiency of such a network, rejection of inter-symbol and inter-user interference, as well as minimization of multiplicative noise effects, caused by multipath phenomena (e.g. fading phenomena), on information data sent to each subscriber located in the area of service of such an integrated network. Based on the framework of multi-parametric stochastic approach described "reaction" (or response) of each specific terrain channel, rural, sub-urban, and urban, it is shown that such a combination of LTE technology and MU-MIMO system, based on multi-beam adaptive antennas, can significantly increase capacity and spectral efficiency of each channel, and finally, for a whole system, during the multiple access deployment, as well as can fully mitigate multiplicative noises occurring in terrestrial built-up environments. The corresponding computer experiments and real measurements carried out for specific urban scenarios are presented to proof the proposed approach.

1 citations

Proceedings ArticleDOI
01 Nov 2017
TL;DR: The proposed antennas exhibit wide bandwidth above 4 GHz with an average gain values more than 12.5 dBi, license free, large bandwidth ∼2 GHz, high oxygen attenuation that supports high frequency reuse and large number of components integration on small area (Massive MIMO).
Abstract: To fulfill the extensive increase in the capacity and quality of multiple users, 5G next generation cellular network system is expected to be in the form of heterogeneous radio access networks (Het-RAN) [1]. It is expected to encompass small cells, known as macro, pico or femto cells. For such dense deployment, network operators have preferably deduced the mechanism of cloud networks called C-RAN due to their highly optimized operational efficiency and cost effectiveness. A centralized operating system which can easily be integrated with existing 4G/LTE networks is main aim of mobile phone operators. This approach reduces remarkably front haul overheads in C-RANs [2]. To expand the architecture of C-RAN, large number of antennas at access end majorly contributes to increase the network capacity either by improving the spectrum bandwidth or by increasing the number of active users at a specific time. Future 5G wireless and mobile communication operating systems require high transmission data rates and large channel bandwidth. Therefore, they can adopt millimeter-wave (MMW) band (30–300 GHz) as main operating frequencies to fulfill the requirements. In this paper, we focused on 60 GHz MMW frequency band. The potential benefits are, it is license free, large bandwidth ∼2 GHz, high oxygen attenuation that supports high frequency reuse and large number of components integration on small area (Massive MIMO). Moreover, we designed, simulated and optimized novel antennas suitable for implementing in the wireless devices of CRAN networks. In addition to compact, low cost, light weight, and ease of integration, the proposed antennas exhibit wide bandwidth above 4 GHz with an average gain values more than 12.5 dBi.

1 citations


Cites background from "LTE-advanced: next-generation wirel..."

  • ...In current years, to fulfill capacity requirements of Next generation wireless networks (NGN): (i) network densification (ii) enhanced spectral efficiency (SE) and (iii) spectrum extension are widely proposed by wireless community [5]....

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Journal ArticleDOI
TL;DR: The pseudometric structure, as a fundamental topology on the azimuth solution space, provides a new lens to address other CCO issues concerning the antenna azimUTH variables and, thus, provokes rethinking on the coverage optimization of cellular system in general.
Abstract: This article, with the intent of maximizing the cellular system coverage ratio, reveals the pseudometric structure of the solution space for antenna azimuth variables. First, we study the solution space of azimuth variables with equivalent and neighboring characteristics. A generalized improvement to coverage and capacity optimization (CCO) approaches is proposed only in the light of the pseudometric structure of the solution space. Then, we model the optimization problem as an unconstrained one and propose a pseudometric-driven evolutionary algorithm to optimize the coverage ratio. Experiments are carried out both in the ideal and the practical urban scenarios. Simulation results show that the proposed algorithm edges out other baseline algorithms belonging to evolutionary computation and swarm intelligence with respect to the convergence speed and the final coverage result. Furthermore, the pseudometric structure, as a fundamental topology on the azimuth solution space, provides a new lens to address other CCO issues concerning the antenna azimuth variables and, thus, provokes rethinking on the coverage optimization of cellular system in general.

1 citations


Cites background from "LTE-advanced: next-generation wirel..."

  • ...The radio access technology of the cellular system is long-term evolution [26]....

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01 Jan 2013
TL;DR: In this paper, the authors propose a method to solve the problem of the problem: this paper... ]..,.. )].. [1].
Abstract: ii

1 citations


Cites background from "LTE-advanced: next-generation wirel..."

  • ...LTE-A provides the following enhancements to LTE [15] :...

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Proceedings ArticleDOI
11 Jul 2011
TL;DR: This paper extends the conventional multiple descriptor transmission strategy with two new features, the selective-frame-based replication and a time-shifted descriptor transmission, and shows that with these two features, RMD outperforms other schemes in terms of PSNR improved, while only requiring moderate data overheads.
Abstract: Wireless IP-based video broadcast suffers from heavy packet losses caused by multipath fading and interference variations in the wireless channels. This paper addresses this issue by proposing an application-layer error-resilience scheme, called the replicate multiple descriptor coding scheme (RMD). In principle, RMD extends the conventional multiple descriptor transmission strategy with two new features, the selective-frame-based replication and a time-shifted descriptor transmission. We show that with these two features, we are able to exploit the time diversity in a time-sharing channel to mitigate the damage impact and provide more efficient protection for the video. The simulation results confirm that when the packet loss rate is heavy (e.g., 15%–35%), RMD outperforms other schemes in terms of PSNR improved, while only requiring moderate data overheads.

1 citations


Cites background from "LTE-advanced: next-generation wirel..."

  • ..., BCMCS of CDMA2000 [8], WiMax [19], LTE [7], DVB-H [4] and MBMS of WCDMA [16]), where regular data is delivered along with some outer codes, which is able to fix certain number of errors at receivers without retransmission....

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  • ...The forwarderror-coding (FEC) is one of such schemes employed by the physical layer of most existing wireless networks (i.e., BCMCS of CDMA2000 [8], WiMax [19], LTE [7], DVB-H [4] and MBMS of WCDMA [16]), where regular data is delivered along with some outer codes, which is able to fix certain number of errors at receivers without retransmission....

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  • ...[7] Ghosh, A., Ratasuk, R., Mondal, B., Mangalvedhe, N., Thomas, T., “LTE-advanced: next-generation wireless broadband technology,” IEEE Wireless Comm., vol. 17, no. 3, pp. 10-22, June 2010....

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References
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Proceedings ArticleDOI
01 Sep 2006
TL;DR: A preliminary look at the air interface for Evolved UTRA (E-UTRA) and associated key technologies required to reach its design objectives are provided.
Abstract: With the emergence of packet-based wireless broadband systems such as 802.16e, it is evident that a comprehensive evolution of the universal mobile telecommunications system specifications is required to remain competitive. As a result, work has begun on long term evolution (LTE) of the UMTS terrestrial radio access and radio access network aimed for commercial deployment in 2010. Goals for the evolved system include support for improved system capacity and coverage, high peak data rates, low latency, reduced operating costs, multi-antenna support, flexible bandwidth operations and seamless integration with existing systems. To reach these goals, a new design for the air interface is envisioned. This paper provides a preliminary look at the air interface for Evolved UTRA (E-UTRA) and associated key technologies required to reach its design objectives. Initial E-UTRA system performance results show a 2 to 3x improvement over a reference Rel-6 UMTS system configuration [1, 2] for both uplink and downlink.

30 citations

Proceedings ArticleDOI
24 Oct 2008
TL;DR: The proposed channel estimation technique is shown to have significant gains in performance compared to other well known channel estimation techniques such as the maximum-likelihood (ML) and the inverse fast Fourier transform (IFFT) channel estimation methods.
Abstract: The performance of the uplink physical channel of the 3GPP LTE system is considered in this paper. Assuming a single user spatial division multiple access transmission scheme, where users' signals are transmitted over different subcarriers, a low complexity channel estimation technique is proposed for the physical uplink shared channel (PUSCH). The proposed channel estimation technique is shown to have significant gains in performance compared to other well known channel estimation techniques such as the maximum-likelihood (ML) and the inverse fast Fourier transform (IFFT) channel estimation methods [5]. Simulation results for different channel models and modulation and coding schemes (MCS) using incremental redundancy (IR) based hybrid automatic repeat request (HARQ) operation are also shown. Finally, a robust detection scheme is proposed for the physical uplink control channel (PUCCH) and simulation results are summarized.

10 citations


"LTE-advanced: next-generation wirel..." refers methods in this paper

  • ...The DFT precoding operation is performed to reduce the cubic metric (CM) of the signal, leading to higher maximum transmit power [2]....

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Trending Questions (1)
What is the difference between LTE Home Internet and FIOS?

LTE-Advanced (also known as LTE Release 10) significantly enhances the existing LTE Release 8 and supports much higher peak rates, higher throughput and coverage, and lower latencies, resulting in a better user experience.