研究目的
Investigating the performance of the SS-OOFDM system in high-speed mobile scenarios and proposing a time-domain channel estimation method and a subband decision feedback and feedforward equalizer (SDFFE) to improve the bit-error-rate (BER) performance.
研究成果
The SS-OOFDM system with the designed CE and equalization algorithms achieves improved BER performance in high-speed mobile scenarios compared to the traditional OFDM system. The oversampling gain and diversity gains contribute to the robust transmission of user data.
研究不足
The study assumes perfect CSI for verifying the SDFFE performance, excluding the CE error. The practical implementation may face challenges due to computational complexity and ISI.
1：Experimental Design and Method Selection:
The SS-OOFDM system is designed to accommodate high-speed mobile scenarios. A time-domain channel estimation method using the basis expansion model and Slepian sequences-based interpolation is developed. The SDFFE is designed to exploit Doppler and multipath diversity gains.
2：Sample Selection and Data Sources:
The LTE’s 1.4 MHz mode is selected for evaluating the SS-OOFDM error-rate performance. The typical urban (TU12) channel model is chosen with 12 channel taps.
3：4 MHz mode is selected for evaluating the SS-OOFDM error-rate performance. The typical urban (TU12) channel model is chosen with 12 channel taps.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Turbo code with code rate 1/3, square root raised cosine interpolators with 20 and 18 taps for filtering.
4：Experimental Procedures and Operational Workflow:
The SS-OOFDM signal is divided into subbands, each processed with IFFT, CP insertion, and multistage polyphase interpolation. The received signal is sampled, and channel estimation and equalization are performed.
5：Data Analysis Methods:
The BER performance is evaluated under various normalized Doppler spreads. The PSD of the SS-OOFDM signal is compared with existing waveforms.
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