LTE-advanced: next-generation wireless broadband technology [Invited Paper]
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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TL;DR: The novel design to tune the performance of spade card microstrip antenna that can operate on the single, dual or multi-band and able to produce circular or linear polarization using Back Propagation Neural Network in order to obtain an optimum design with a backpropagation algorithm as a solution to simplify the design process is presented.
Abstract: The microstrip antennas have different dimensions to get the desired performance, especially for microstrip antennas that have complex components and dimensions with the performance: the range of frequency at 2.4 GHz until 3.6 GHz, Maximum Power of Gain value is 5.83 dB and the minimum value is 3 dB and Maximum Directivity Value is 6.22 and the minimum value is 3.32. in consequence, needs to fill the demand for a new and the corresponding design as solvent to adaptive matching as tuner the frequency on antenna design that needs requires a complex mathematical method and simulation. This paper has the novel design to tune the performance of spade card microstrip antenna that can operate on the single, dual or multi-band and able to produce circular or linear polarization using Backpropagation Neural Network in order to obtain an optimum design with a backpropagation algorithm as a solution to simplify the design process. As a result, after 20000 epochs the training loss is around 0.044 and the testing loss is around 0.058. The model has a good performance despite only using a few numbers of training data.
9 citations
Cites background from "LTE-advanced: next-generation wirel..."
...One example of the application of wireless communication is WLAN (Wireless Local Area Network) that can meet the needs of access to information and communication that can be used anywhere and anytime[1]....
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TL;DR: It is found that for CA configuration with wider PCell bandwidth resulting better throughput, the throughput of non-contiguous CA is better than CA contiguous and in the inter-band CA, CC combination with a lower frequency produces higher throughput.
Abstract: Carrier aggregation (CA) is a major feature in LTE-advanced technology that allows network provider to use more than one carrier simultaneously to increase capacity. CA uses two or more individual component carriers (CCs) of the same (intra-band) and different (inter-band) frequency bands. In this paper, we evaluate CA techniques with the test parameter using BLER and throughput inside the tested area of LTE network. The tested area is designed to represent most common environment in which LTE will be deployed. We use 30 MHz frequency bandwidth in the simulation to evaluate intra-band and inter-band CA technique performance. Two CCs is allocated for primary serving cell (PCell) and secondary serving cell (SCell). Simulation result shows for the downlink, BLER tend to increase, as the frequency configuration is increase. However, for the uplink BLER is zero. We found that for CA configuration with wider PCell bandwidth resulting better throughput. In CA intra-band, the throughput of non-contiguous CA is better than CA contiguous. Then in the inter-band CA, CC combination with a lower frequency produces higher throughput.
9 citations
Cites background from "LTE-advanced: next-generation wirel..."
...These enhancements have been considered in 3GPP as a part of LTE-advanced (LTE-A) and also known as LTE Release 10 specifications [2-4]....
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01 Jan 2010
TL;DR: This thesis provides a comprehensive investigation of the LTE performance analysis based on detailed physical layer parameters to fill the existing gap in current literature in performance study of LTE.
Abstract: The 3 rd Generation Partnership Project (3GPP) introduced Long Term Evolution (LTE) as the 3 rd generation of mobile communication standards. LTE Release 8 describes a mobile communication standard which supports up to 300 Mbps of data transmission in downlink using the OFDM scheme as well as up to 75 Mbps throughput for uplink using the SC-FDMA modulation. In this thesis, an in-depth study of LTE performance based on Release 8 is conducted for uplink and downlink under different scenarios. The main objective of this study is to investigate a comprehensive analysis of physical layer throughput of LTE Release8 based on standard parameters for different channel bandwidths, duplex schemes, antenna diversity and other scenarios. Our study of the FDD operation mode shows that the maximum throughput for downlink data is 299.122 by using 4 antenna ports with the least possible control overhead (one OFDM symbol assigned to PDCCH), 64-QAM data modulation scheme, the maximum code rate (0.92), and the maximum channel bandwidth (20 MHz). This throughput result is based on PDSCH that is used for data transmission only and does not include control information Synchronization Signals (P-SS and S-SS). Our study also shows that the maximum uplink throughput for the FDD operation is 71.97 Mbps excluding control channel information (PUCCH), and reference signals (demodulation reference signals and sounding reference signal). This maximum throughput result is based on assuming 64-QAM data modulation, maximum bandwidth (20 MHz), and 0.85 code rate. This study also presents other throughput results based on different parameters. Overall, this thesis provides a comprehensive investigation of the LTE performance analysis based on detailed physical layer parameters to fill the existing gap in current literature in performance study of LTE.
9 citations
17 Jun 2012
TL;DR: The experimental results show that the RF transceiver designed has a high performance for TDD-LTE system, including high output power, good linearity, low EVM.
Abstract: LTE release 8 is one of the most popular broadband technologies base on OFDM, which is set to deliver very fast data services with peak rate speeds of up to 100Mbs downlink and 50Mbs uplink. In this paper, the development of a RF transceiver for TDD-LTE system is presented. The RF transceiver designed in this paper has 8 channels form 3.411Ghz to 3.551Ghz, steps by 200Mhz and shows a high performance, such as high output power, good linearity, low EVM. The design and measurement of the RF transceiver is detailed described. The experimental results show that the RF transceiver designed has a high performance for TDD-LTE system.
9 citations
01 Apr 2017
TL;DR: This work describes the current state of the research and addresses basic research questions concerning the demands imposed by unmanned aircraft system traffic management and operators, the role of autonomy, throughput requirements, communication network architectures and the possibility of re-using existing mobile and vehicular communications systems.
Abstract: Communication links are inevitably needed by operators as well as by unmanned aircraft system traffic management to command, monitor and coordinate unmanned aircraft in very low level airspace. This is especially true, since a great number of unmanned aircraft is projected for this airspace in the near future. However, a common standard for communication links for unmanned aircraft systems does not exist at the moment. This work describes the current state of the research and addresses basic research questions concerning the demands imposed by unmanned aircraft system traffic management and operators, the role of autonomy, throughput requirements, communication network architectures and the possibility of re-using existing mobile and vehicular communications systems.
9 citations
Cites methods from "LTE-advanced: next-generation wirel..."
...The initial LTE Release 8, completed in 2008 and commercial operation started in 2009, supports peak data rates of 300 Mbit/s on the downlink and 75 Mbit/s in the uplink when using 20 MHz bandwidth [19]....
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References
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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
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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