Abstract
In this letter, we put forth a novel strategy to boost the reliability of orthogonal frequency division multiplexing differential chaos shift keying (OFDM-DCSK) systems over doubly selective fading channels. Provided the accessibility of channel state information, singular value decomposition is exploited to partition the channel into distinct sub-channels, which is realized by multiplying the right singular vectors by the symbol matrix at the transmitter. Subsequently, the sub-channel associated with the largest singular value is allocated to the reference chaotic sequence, leading to a higher signal-to-noise ratio (SNR) of demodulated symbols and lower bit error rate (BER) at the receiver. Inspired by the water-filling principle, the BER can be further reduced by permuting the symbols in a strategic manner. This approach of channel decomposition integrated with symbol reallocation, referred to as singular-vector pre-coded OFDM-DCSK (SVP-OFDM-DCSK), is able to escalate the SNR over doubly selective channels, ultimately enhancing the system reliability. The BER of the SVP-OFDM-DCSK system is also analyzed. Simulation results demonstrate that the proposed system with and without symbol permutation step achieves lower BERs than existing schemes over doubly selective fading channels. © 2012 IEEE.
| Original language | English |
|---|---|
| Pages (from-to) | 1453-1457 |
| Number of pages | 5 |
| Journal | IEEE Wireless Communications Letters |
| Volume | 13 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 2024 |
Funding
This work was supported by the Tibet Natural Science Foundation under Grant XZ202301ZR0024G.
Research Keywords
- bit error rate
- Differential chaos shift keying
- doubly selective fading channel
- reliability
- singular value decomposition
Publisher's Copyright Statement
- COPYRIGHT TERMS OF DEPOSITED POSTPRINT FILE: © 2024 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Liu, Z., So, H. C., Zhang, L., Li, X. P., & Wang, Z.-Y. (2024). A Reliable Singular-Vector Pre-Coded OFDM-DCSK System over Doubly Selective Fading Channels. IEEE Wireless Communications Letters, 13(5), 1453-1457. https://doi.org/10.1109/LWC.2024.3374343