Abstract
In this paper, a pair of clipping interference cancellation detectors based on symbol feedback and soft information are proposed for the generalized space-time-frequency index modulation (GSTFIM) systems. Specifically, the clipping interference is reconstructed by the prior information of the GSFTFIM symbol in these two detectors, then an iterative algorithm is developed for elimination and compensation of the clipping interference. The difference of these two proposed detectors lies in that the symbol feedback based interference cancellation (SFIC) detector completes the iteration through the hard decision symbol, while the soft information based interference cancellation (SIIC) detector iterates by the mean and variance of the estimated symbols. Simulation results show that the proposed two detectors can obtain flexible tradeoff between performance and complexity, compared to the traditional maximum likelihood (ML) detector with clipping interference.
Highlights
INTRODUCTIONA novel multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system [1]–[4], termed as generalized space-time-frequency index modulation (GSTFIM) [5], was developed by conveying the information bits in the space-, time- and frequencydomains
Recently, a novel multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system [1]–[4], termed as generalized space-time-frequency index modulation (GSTFIM) [5], was developed by conveying the information bits in the space, time- and frequencydomains. It originates from the concept of spatial modulation [6]–[8] and index modulation [9]–[11], while obtaining a balanced tradeoff between spectral efficiency and system performance compared to conventional MIMO-OFDM systems
Extended Vehicular A (EVA) channel model [31] and QPSK modulation are employed for the GSTFIM systems. 1/2 rate RSC recursive convolution code is employed for channel coding, and the octonary generating binomial is [7 5]8
Summary
A novel multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system [1]–[4], termed as generalized space-time-frequency index modulation (GSTFIM) [5], was developed by conveying the information bits in the space-, time- and frequencydomains. The research on the clipping issue for the GSTFIM systems is still at an initial stage These detectors in [21]–[26] is conceived on the vector-by-vector based operation, which are not capable of employing to the GSTFIM systems due to the fact that the GSTFIM symbol is a matrix. Against this background, we propose a pair of detectors based on the structure of GSTFIM symbol to solve the in-band distortion caused by clipping. B a denotes the binomial coefficient. || · ||F denotes the Frobenious norm of a matrix. abs(·) denotes the absolute value function. diag α1, α2, · · · , αNt denotes a diagonal matrix, whose diagonal elements is α1, α2, · · · , αNt
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
