Journal ArticleDOI
LTE-advanced: next-generation wireless broadband technology [Invited Paper]
TLDR
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.read more
Citations
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Proceedings ArticleDOI
Sampling-based capacity estimation for unmanned traffic management
TL;DR: This work estimates airspace capacity under several metrics centered on traffic volume manageability, drones noise pollution and spectrum demand which help to quantify technological requirements which the manufacturers must follow in order to ensure seamless operation of small unmanned aerial systems in an urban airspace.
Proceedings ArticleDOI
Novel cavity-type multi-mode filter using TEM-mode and TE-mode
Shigeo Yakuno,Toshio Ishizaki +1 more
TL;DR: In this paper, a cavity-type multi-mode bandpass filter is developed, where TEM and TE modes are degenerated in a single cavity and adjustment methods for resonance frequencies, inter-resonator couplings, and input/output couplings are investigated.
Load Balancing in Heterogeneous LTE-A Networks
Kennedy Ronoh,Awoke Mengistie +1 more
TL;DR: One feature of LTE-A is the use ofheterogeneous networks (HetNets) which consist of macro-cells and low power nodes (LPNs), one of the objectives of this trial was to demonstrate the versatility of the HetNet architecture.
Proceedings ArticleDOI
Investigation on improvement in channel estimation accuracy using data signal muting in downlink coordinated multiple-point transmission and reception in LTE-Advanced
TL;DR: Investigation of a technique to improve the channel estimation for downlink CoMP in Long-Term Evolution (LTE)-Advanced shows that data signal muting is effective in improving theChannel estimation accuracy and consequently the throughput performance, especially for sets of user equipment at the cell boundary.
References
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Proceedings ArticleDOI
Overview of UMTS Air-Interface Evolution
Brian K. Classon,Kevin L. Baum,Vijay Nangia,R. Love,Yakun Sun,R. Nory,K. Stewart,Arunabha Ghosh,Rapeepat Ratasuk,Weimin Xiao,Jun Tan +10 more
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.
Proceedings ArticleDOI
On UMTS-LTE Physical Uplink Shared and Control Channels
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.