Journal ArticleDOI
Carrier aggregation for LTE-advanced: design challenges of terminals
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In this article, the relevant design challenges of terminals are discussed and several receiver architectures are compared from the perspective of design tradeoff.Abstract:
Carrier aggregation is a key feature of 3GPP LTE that addresses the support of higher data rates and utilization of fragmented spectrum holdings. In this article, the relevant design challenges of terminals are discussed. The transmitter architectures are reviewed, and the minimum amount of power amplifier back-offs is evaluated. In addition, several receiver architectures are compared from the perspective of design tradeoff. The radio impairments affecting the receiver performance are analyzed and the simulation results are provided. The corresponding silicon implementation is presented together with the measurement results.read more
Citations
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Journal ArticleDOI
Behavioral Modeling and Linearization of Wideband RF Power Amplifiers Using BiLSTM Networks for 5G Wireless Systems
TL;DR: A bridge is made between memory effects of the nonlinear PAs and memory of bidirectional long short-term memory (BiLSTM) neural networks and its accompanying digital predistortion (DPD) model by reconciling a non causality concern.
Journal ArticleDOI
Enabling Multi-Functional 5G and Beyond User Equipment: A Survey and Tutorial
TL;DR: A novel hardware reuse and multiplexing solution to facilitate cost-effective and energy-efficient UE design is proposed and analyzed, followed by an investigation of state-of-the-art hardware development from the systems and circuits standpoint.
Journal ArticleDOI
Vivaldi Antenna With Pattern Diversity for 0.7 to 2.7 GHz Cellular Band Applications
TL;DR: In this paper, a planar ultrawideband Vivaldi antenna for base-station pattern diversity applications is presented, which is designed to cover most of the cellular and LTE bands, a very wide frequency range from 0.7 to 2.7 GHz.
Journal ArticleDOI
Transmission Experiment of Bandwidth Compressed Carrier Aggregation in a Realistic Fading Channel
Tongyang Xu,Izzat Darwazeh +1 more
TL;DR: Experimental results show that the measured bit error rate performance for CA-SEFDM is very close to CA-OFDM and that the effective spectral efficiency of CA- SEFDM can be substantially higher than that of CA -OFDM.
Journal ArticleDOI
Adaptive Nonlinear RF Cancellation for Improved Isolation in Simultaneous Transmit–Receive Systems
Adnan Kiayani,Muhammad Zeeshan Waheed,Lauri Anttila,Mahmoud Abdelaziz,Dani Korpi,Ville Syrjala,Marko Kosunen,Kari Stadius,Jussi Ryynanen,Mikko Valkama +9 more
TL;DR: In this paper, the authors proposed an active radio frequency (RF) cancellation solution to suppress the transmitter (TX) passband leakage signal in radio transceivers supporting simultaneous transmission and reception.
References
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Journal ArticleDOI
Carrier aggregation for LTE-advanced: functionality and performance aspects
Klaus I. Pedersen,Frank Frederiksen,Claudio Rosa,Hung T. Nguyen,Luis Guilherme Uzeda Garcia,Yuanye Wang +5 more
TL;DR: This article presents a summary of the supported CA scenarios as well as an overview of the CA functionality for LTE-Advanced with special emphasis on the basic concept, control mechanisms, and performance aspects and demonstrates how CA can be used as an enabler for simple yet effective frequency domain interference management schemes.
Proceedings ArticleDOI
A receiver for LTE Rel-11 and beyond supporting non-contiguous carrier aggregation
Lars Sundström,Martin Anderson,Roland Strandberg,Staffan Ek,Jim Svensson,Fenghao Mu,Tommy Olsson,Imad ud Din,Leif Wilhelmsson,Daniel Eckerbert,Sven Mattisson +10 more
TL;DR: Support for non-contiguous (NC) carriers within bands within bands is added in 3GPP LTE Rel-11 to meet the demand for further increased bitrates.
A Receiver for LTE Rel-11 and Beyond Supporting Non-Contiguous Carrier Aggregation
Lars Sundström,Martin Andersson,Roland Strandberg,Staffan Ek,Jim Svensson,Fenghao Mu,Tommy Olsson,Imad ud Din,Leif Wilhelmsson,Daniel Eckerbert,Sven Mattisson +10 more
TL;DR: In this paper, the authors proposed to add support for non-contiguous (NC) carriers within bands within LTE Rel-11, which is the first LTE-Rel-11 to support NC CA in handsets.
Proceedings ArticleDOI
Complex IF harmonic rejection mixer for non-contiguous dual carrier reception in 65 nm CMOS
Lars Sundström,Staffan Ek,Jim Svensson,Martin Anderson,Roland Strandberg,Fenghao Mu,Imad ud Din,Tommy Olsson,Leif Wilhelmsson,Daniel Eckerbert +9 more
TL;DR: This paper presents a complex IF mixer for a double conversion receiver architecture to be used for non-contiguous dual carrier reception as specified in upcoming releases of 3GPP standards.