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MIMO-OFDM Transmissions Invoking Space-Time/Frequency Linear Dispersion Codes Subject to Doppler and Delay Spreads

Published

Author(s)

Jiayi Zhang, Hamid Gharavi, Bin Hu

Abstract

Linear dispersion codes (LDC) can support arbitrary configurations of transmit and receive antennas in multiinput multi-output (MIMO) systems. In this paper, we investigate two transmit diversity applications of LDC for orthogonal frequency division multiplexing (OFDM) systems in order to achieve space-time/frequency (ST/SF) diversity gains when transmitting over time-/frequency-selective fading channels. LDC-aided ST/SF-OFDM is flexible in configuring various numbers of transmit antennas and time-slots or frequency-tones. Our results show that the ST-OFDM scheme is sensitive to exploiting diversity gains, subject to the impact of varying channel Doppler spreads; while the performance of SF-OFDM is mainly subject to delay spread. Particularly, when the transmitter employs more than two antennas, the LDC-aided ST/SF-OFDM outperforms the orthogonal block codes (e.g. Tarokh's codes) aided ST/SF-OFDM, when communicating over higher Doppler/delay spread.
Proceedings Title
IEEE Wireless Communications and Networking Conference (WCNC)
Conference Dates
April 3-6, 2016
Conference Location
Doha, -1
Conference Title
IEEE-wcn.org/

Keywords

MIMO, OFDM, LDC, 5G, wireless networks
Created April 4, 2016, Updated November 30, 2017