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arXiv 2408.09192eess.SP
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基于OFDM的共生无线电无干扰反向散射通信

Interference-Free Backscatter Communications for OFDM-Based Symbiotic Radio

Muhammad Bilal Janjua, Alphan Şahin, Hüseyin Arslan

AI总结:

本研究针对共生无线电系统,提出三种基于FSK的OFDM反向散射调制方案,通过基站清空特定子载波实现主信号与反向散射信号正交,采用非相干检测解决信道估计难题,仿真显示30 dB时误码率低至10⁻⁴。

摘要:

本研究提出一种基于正交频分复用(OFDM)的方案,以在共生无线电系统中实现无干扰反向散射通信(BC)。具体而言,我们提出三种基于频移键控(FSK)的反向散射调制方案,通过在频域上偏移基站(BS)发射的OFDM符号等主信号来传输其信息。共生地,基站会清空频段内的特定子载波,使得反向散射设备的频移接收信号与主信号始终正交。第一种方案依赖FSK调制内的开关键控(OOK)组合,而第二和第三种方案基于传统FSK调制,采用不同的带内空载波分配方式。这些方案允许接收机使用非相干检测,解决了反向散射设备信号的信道估计难题。我们从理论上推导了检测器的误码率性能。综合仿真表明,所提方法通过消除直接链路干扰,在30 dB时BC误码率可低至10⁻⁴。

英文摘要:

This study proposes an orthogonal frequency division multiplexing (OFDM) based scheme to achieve interference-free backscatter communications (BC) in a symbiotic radio system. In specific, we propose three frequency shift keying (FSK) based backscatter modulation schemes to shift the primary signal, i.e., the OFDM symbols transmitted from a base station (BS), in the frequency domain to transmit its information. Symbiotically, the BS empties specific subcarriers within the band so that the received frequency-shifted signals from the backscatter device and the primary signal are always orthogonal. The first scheme relies on the combination of on-off keying (OOK) within the FSK modulation while the second and the third schemes are based on the conventional FSK modulation with different in-band null-subcarrier allocation. These schemes allow the use of non-coherent detection at the receiver which addresses the channel estimation challenge for the signals arriving from a backscatter device. We derive the bit-error rate performance of the detector theoretically. The comprehensive simulations show that the proposed approach achieves a lower bit-error rate up to 10-4 at 30 dB with BC by eliminating direct link interference.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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