Title :
System Layer Evaluation of Imperfect Adaptive Beam-Forming Antenna for Mixed Services in the LTE TDD System
Author :
Yang, Ruiming ; Chang, Yongyu ; Liu, Shuhui ; Yang, Dacheng
Author_Institution :
Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
Adaptive beam-forming antenna (ABA) has been adopted as one of the key techniques of the TDD system. Because of the spatial variation of UE and imprecise digital signal processing (DSP) in the practical system, the system performance is deteriorated by the estimation errors of the direction of arrival (DOA). We evaluate the LTE TDD downlink performance of ABA without DOA estimation errors. Meanwhile, the impact of imperfect ABA on the system performance for the FTP-specific service as well as mixed services including FTP and video is investigated. Also a simple mixed services scheduler with adaptive emergency threshold (AET) is proposed over LTE TDD system to improve the system throughput while guaranteeing the quality of service (QoS) of video service.
Keywords :
antenna arrays; array signal processing; direction-of-arrival estimation; quality of service; time division multiplexing; LTE TDD system; QoS; adaptive beamforming antenna; adaptive emergency threshold; digital signal processing; direction-of-arrival; error estimation; quality of service; system layer evaluation; video service; Adaptive arrays; Adaptive scheduling; Adaptive systems; Digital signal processing; Direction of arrival estimation; Downlink; Estimation error; Quality of service; System performance; Throughput;
Conference_Titel :
Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-2518-1
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2010.5493765
