Joint Spatio-Temporal Precoding for Practical Non-Stationary Wireless Channels
| العنوان: | Joint Spatio-Temporal Precoding for Practical Non-Stationary Wireless Channels |
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| المؤلفون: | Zhibin Zou, Maqsood Careem, Aveek Dutta, Ngwe Thawdar |
| المصدر: | IEEE Transactions on Communications. 71:2396-2409 |
| بيانات النشر: | Institute of Electrical and Electronics Engineers (IEEE), 2023. |
| سنة النشر: | 2023 |
| مصطلحات موضوعية: | Signal Processing (eess.SP), FOS: Computer and information sciences, Computer Science - Information Theory, Information Theory (cs.IT), FOS: Electrical engineering, electronic engineering, information engineering, Electrical Engineering and Systems Science - Signal Processing, Electrical and Electronic Engineering |
| الوصف: | The high mobility, density and multi-path evident in modern wireless systems makes the channel highly non-stationary. This causes temporal variation in the channel distribution that leads to the existence of time-varying joint interference across multiple degrees of freedom (DoF, e.g., users, antennas, frequency and symbols), which renders conventional precoding sub-optimal in practice. In this work, we derive a High-Order Generalization of Mercer's Theorem (HOGMT), which decomposes the multi-user non-stationary channel into two (dual) sets of jointly orthogonal subchannels (eigenfunctions), that result in the other set when one set is transmitted through the channel. This duality and joint orthogonality of eigenfuntions ensure transmission over independently flat-fading subchannels. Consequently, transmitting these eigenfunctions with optimally derived coefficients eventually mitigates any interference across its degrees of freedoms and forms the foundation of the proposed joint spatio-temporal precoding. The transferred dual eigenfuntions and coefficients directly reconstruct the data symbols at the receiver upon demodulation, thereby significantly reducing its computational burden, by alleviating the need for any complementary post-coding. Additionally, the eigenfunctions decomposed from the time-frequency delay-Doppler channel kernel are paramount to extracting the second-order channel statistics, and therefore completely characterize the underlying channel. We evaluate this using a realistic non-stationary channel framework built in Matlab and show that our precoding achieves ${\geqslant}$4 orders of reduction in BER at SNR${\geqslant}15$dB in OFDM systems for higher-order modulations and less complexity compared to the state-of-the-art precoding. Comment: This paper is accepted by IEEE Transactions on Communications. arXiv admin note: substantial text overlap with arXiv:2202.04148 |
| تدمد: | 1558-0857 0090-6778 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b0ccbc4eed9693a59f6599d97e2d9e32 https://doi.org/10.1109/tcomm.2023.3241326 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....b0ccbc4eed9693a59f6599d97e2d9e32 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15580857 00906778 |
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