Investigating the Effect of Nonlinearity on Adaptive Arrays
With witness the 4G wireless evolution,one can experience the technology competition between Mobile WiMAX and LTE(Long Term Evolution).One of the enabling technologies to the focused issue,Convergence and Competition on the Way toward 4G,from the wireless communication prospects by various viewpoints of the contributing authors 1,2,is the Beam forming architecture to support space-division multiple access(SDMA)3.This approach enables multiple users within the same radio cell to be accommodated on the same frequency and time slot.The beam forming technologies are used to modify its time,frequency,and spatial response by using internal feedback for controlling the amplitude/phase weighting of the adaptive array 4.However,realizing the beam-forming techniques poses high linearity demands on RF/IF up-/down-conversion chain because the inter-modulation products(IMPs)due to nonlinear distortion will degrade the radiation pattern,resulting in the poor signal quality.This study modeling the multi-modulated input signals for multi-carrier power amplifier(MCPA)at up/down-conversion chain is introduced.The nonlinearity effects of the MCPAs on an 8-element adaptive array are investigated to assess the radiation pattern deviation due to the phantom lobes 5 generated by IMPs at MCPA.
Cheng-Nan Hu
Communication Research Center(CRC),Oriental Institute of Technology No.58,Sec.2,Sihchuan Rd,Ban-Ciao City,Taipei County,Taiwan,R.O.C.
国际会议
Progress in Electromagnetics Research Symposium 2011(2011年电磁学研究新进展学术研讨会)
苏州
英文
282-285
2011-09-01（万方平台首次上网日期，不代表论文的发表时间）