NDLI: Equalisation, despreading, and beamforming scenarios of complex spread-OFDM/OQAM in single-input multi-output channels

Content Provider	IET Digital Library
Author	Tabatabaee, Seyyed Mohammad Javad Asgari Towliat, Mohammad Rajabzadeh, Morteza
Abstract	Orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) is a promising multicarrier system, which can achieve a better bandwidth efficiency than cyclic prefix (CP)-OFDM. However, OFDM/OQAM suffers from an inherent interference. Since in OFDM/OQAM, the data symbols are real-valued, the pure imaginary self-interference can be eliminated by removing the imaginary part of the received signal. On the other hand, in the literature, it is shown that even for complex-valued data symbols, the self-interference can be eliminated if a spreading code is employed. The resulted scheme is called spread-OFDM/OQAM. In this study, we extend spread-OFDM/OQAM for single-input multi-output channels. In case of multiple antennas, at the receiver after demodulation, the following processes must be performed: equalisation (to remove the channel effect), despreading of spreaded symbols, and beamforming of multiple antennas. We propose three scenarios to apply the mentioned processes. In the first scenario, despreading, equalisation, and beamforming are performed jointly in one step. In the second scenario, despreading and equalisation are accomplished jointly and then beamforming is performed. In the last scenario, each of those processes is applied separately. We compare the complexity of the proposed approaches. Also their performance is evaluated through simulations in terms of bit error rate.
Starting Page	1061
Ending Page	1069
Page Count	9
ISSN	17518628
Volume Number	13
e-ISSN	17518636
Issue Number	Issue 8, May (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/13/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.5581
Journal	IET Communications
Publisher Date	2019-02-04
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Array Array Signal Processing Communication Channel Equalisation And Identification Complex Spread-OFDM/OQAM Complex-valued Data Symbols Cyclic Prefix-OFDM Doppler Shift Electromagnetic Compatibility Equalisation, Despreading, And Beamforming Scenario Equaliser Error Statistics Interference Modulation And Coding Method OFDM Modulation Pure Imaginary Self-interference Quadrature Amplitude Modulation Radio Frequency Interference Radio Link And Equipment Signal Processing And Detection SIMO Communication Single-input Multioutput Channel Spreaded Symbols Statistics Time-variant Channel Transmitted Data Symbols Wireless Channel
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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