Abstract
In this paper, a generalized MIMO Spatial Multiplexing (SMX) system with a new Index Modulation (IM) domain called filter IM domain is proposed. This filter domain generalizes the time and frequency IM domains. In particular, a Filter Shape IM (FSIM) is used to virtually transmit a part of the information bitstream by indexing the filter shape varying at the symbol rate. This scheme permits to achieve high Spectral Efficiency (SE) since it uses all the available time, frequency, and spatial resources. The proposed transceiver can be easily reconfigured to operate as a conventional MIMO SMX transceiver. Compared to the existing systems, the proposed system achieves the highest SE gain with the help of IM and MIMO multiplexing gain. The theoretical lower bound is derived to characterize the SMX FSIM system performance. The results reveal that SMX FSIM with 2 filter shapes only outperforms by 3.5 dB up to more than 12 dB the equivalent SMX QAM system at the same SE. Furthermore, a complete analysis in the sub-THz indoor environment with RF impairments is provided for the proposed system, SMX QAM, and Generalized Spatial Modulation. Finally, the results show that SMX FSIM with a linear receiver has better performance and robustness to phase noise, lower transceiver cost, higher SE/energy efficiency gain, and lower power consumption.
Highlights
The wireless data traffic is expected to increase by more than 10 000-fold by the year 2030 [1]
After considering the sub-Thz aspects in the design phase of the proposed Spatial Multiplexing (SMX)-Filter Shape IM (FSIM) system and its theoretical performance validation, we studied the proposed transceiver in MIMO sub-THz channels generated from a ray-based deterministic channel model by our BRAVE partner [23]
Note that the equalization is performed at sample level before matched filter and down-sampling, since the selected filter in FSIM symbol is still unknown for the receiver at this stage
Summary
The wireless data traffic is expected to increase by more than 10 000-fold by the year 2030 [1]. The Orthogonal-Frequency-Division-Multiplexing OFDM-IM technique [12], [13] in frequency IM domain conveys the VB in the combination of activated sub-carries while providing better performance at low data rates and lower complexity at the price of SE loss with high order modulation. 4) The performance of the proposed SMX FSIM scheme is evaluated under sub-THz channels with RF impairments, compared to the existing ultra-high data rate candidates (GSM and conventional SMX QAM [4]). The results reveal that the spectrally efficient SMX-FSIM with power-efficient APM is the best promising candidate for such systems in sub-THz bands because it has better performance and robustness to PN, higher SE and EE gain, lower power consumption and cost, as well as it avoids the RF switching problem that appears with transmitter spatial IM (e.g., GSM).
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