Advanced Technologies for LTE Advanced

Advanced technologies for LTE advanced

Authors: Oh-Soon Shin, Salah Eddine Elayoubi, Yeon Kyoon Jeong and Yoan Shin

Kalman interpolation filter for channel estimation of LTE downlink in high-mobility environments

The estimation of fast-fading LTE downlink channels in high-speed applications of LTE advanced is investigated in this article. In order to adequately track the fast time-varying channel response, an adaptive ...

Authors: Xuewu Dai, Wuxiong Zhang, Jing Xu, John E Mitchell and Yang Yang

Uplink interference protection and scheduling for energy efficient OFDMA networks

One of the key challenges for future orthogonal frequency division multiple access-based networks is inter-cell interference coordination. With full frequency reuse and small inter-site distances, coping with ...

Authors: Harald Burchardt, Zubin Bharucha, Gunther Auer and Harald Haas

Low complexity PAPR reduction methods for carrier-aggregated MIMO OFDMA and SC-FDMA systems

New generation wireless systems target to support much higher data rate which requires larger bandwidth than the existing systems. Lack of contiguous spectrum resources and the compatibility requirement with t...

Authors: Pochun Yen and Hlaing Minn

A decentralized spectrum allocation and partitioning scheme for a two-tier macro-femtocell network with downlink beamforming

This article examines spectrum allocation and partitioning schemes to mitigate cross-tier interference under downlink beamforming environments. The enhanced SIR owing to beamforming allows more femtocells to s...

Authors: Sunheui Ryoo, Changhee Joo and Saewoong Bahk

Optimizing distance, transmit power, and allocation time for reliable multi-hop relay system

In multi-hop relay systems, the end-to-end channel capacity is restricted by bottleneck node. In order to prevent some relay nodes from being the bottleneck of system and to guarantee the end-to-end channel ca...

Authors: Pham Thanh Hiep, Fumie Ono and Ryuji Kohno

Resource management issues for multi-carrier relay-enhanced systems

Relaying is one of the enabling techniques for next generation systems. Factors deciding on performance of relay-enhanced systems are the resource allocation and coordination. The capacity of the wireless rela...

Authors: Jacek Góra and Simone Redana

A resource block organization strategy for scheduling in carrier aggregated systems

Carrier aggregation (CA) is a promising technology that will allow IMT-Advanced system candidates to achieve spectrum bandwidths of up to 100 MHz using available system resource blocks (RB), even if these are ...

Authors: Guillermo Galaviz, David H Covarrubias, Angel G Andrade and Salvador Villarreal

Implementing opportunistic spectrum access in LTE-advanced

Long term evolution advanced (LTE-A) has emerged as a promising mobile broadband access technology aiming to cope with the increasing traffic demand in wireless networks. However, the enhanced spectral efficie...

Authors: Vicente Osa, Carlos Herranz, Jose F Monserrat and Xavier Gelabert

Cooperative relaying in OFDMA networks based on the joint use of hierarchical modulation and link adaptation

In cooperative relaying, the base station broadcasts a signal to the destination, the relay overhears it and forwards it in a next time slot to the destination. The latter combines the two received copies of t...

Authors: Anis Jdidi and Tijani Chahed

Determinant-based MIMO scheduling with reduced pilot overhead

In a multiuser multiple-input multiple-output (MU-MIMO) cellular system where there are many candidate users, it is critical to select a user group which maximizes the overall throughput of the system. However...

Authors: Kyeongjun Ko and Jungwoo Lee

Overview of enabling technologies for 3GPP LTE-advanced

As the long term evolution (LTE) standard comes to an end, 3rd Generation Partnership Project is discussing further evolution of the LTE to meet the international mobile telecommunications advanced requirement...

Authors: Thien-Toan Tran, Yoan Shin and Oh-Soon Shin

Low-complexity multiuser MIMO downlink system based on a small-sized CQI quantizer

It is known that the conventional semi-orthogonal user selection based on a greedy algorithm cannot provide a globally optimal solution due to its semi-orthogonal property. To find a more optimal user set and ...

Authors: Jiho Song, Jong-Ho Lee, Seong-Cheol Kim and Younglok Kim