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Smart Antennas Technology Based on OFDM Systems

Author: HanShuangLin
Tutor: ChenJianChun
School: Xi'an University of Electronic Science and Technology
Course: Signal and Information Processing
Keywords: Smart antenna Orthogonal Frequency Division Multiplexing Digital beamforming Adaptive equalization
CLC: TN821.91
Type: Master's thesis
Year: 2011
Downloads: 71
Quote: 0
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Abstract


The smart antenna SDMA technology can exponentially expand the communication capacity , maximize the use of spectrum resources , but also can effectively overcome the delay spread , multipath fading adverse impact . OFDM technology is a special kind of multi-carrier technology , has high spectrum efficiency and good anti-multipath interference ability . The smart antenna technology and OFDM technology, which can effectively improve the system performance . Smart antennas and OFDM technology has become the core technology of the next generation of mobile communications . Thesis research the digital beamforming smart antenna -OFDM system technology . This paper first introduces the two basic beamforming smart antenna -OFDM system structure , beamforming of time domain and frequency domain beamforming computer modeling and simulation , and them . After several improved algorithm , improved on the basis of time-domain beamforming beamforming algorithm , based on the improvement in the frequency domain beamforming sub - carrier aggregation method and the combination of time domain and frequency domain beamformer improved algorithm Hybrid- FFT . Finally, we propose a new beam formation based on the frequency-domain adaptive equalizer pre-FFT algorithm . The algorithm of the adaptive equalizer cascade after the FFT module , respectively, for each sub - carrier frequency domain equalizer . Equalization technique of channel distortion compensation, to effectively reduce the system bit error rate . Experimental results show that the complexity of the algorithm is relatively low effective against multipath effects , and better performance .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > Antenna: work principle > Smart antenna
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