Abstract
Visible light communication (VLC) based on a light-emitting diode (LED) is considered to be a potential candidate for the next-generation communication. In this paper, a novel Zadoff–Chu matrix transform (ZCT) precoding is proposed to improve the performance of the traditional space-time block coding- (STBC-) based multiple-input multiple-output and orthogonal frequency division multiplexing (MIMO-OFDM) system. Compared with the existing orthogonal circulant matrix transform (OCT) precoding scheme, the proposed ZCT precoding achieves a much lower peak-to-average power ratio (PAPR) while maintaining the advantage of the uniform signal-to-noise ratio (SNR), which reduces the performance loss caused by LED nonlinearity. To study the system performance further, we set up an experimental demonstration to verify performance improvement under the condition of different driving peak-to-peak voltages (Vpps) and direct current (DC) offsets. Experimental results show that ZCT precoding gains the best bit error rate (BER) performance compared with the traditional and the OCT precoding MIMO-OFDM systems, whose BER is always below the 7% pre-forward error correction (pre-FEC) threshold of 3.8 × 10−3.
Highlights
With high luminous power, small size, good modulation performance, and low cost, white light-emitting diode (LED) is expected to be the recommended lighting equipment for the generation [1, 2]
We propose and experimentally demonstrate a novel Zadoff–Chu matrix transform (ZCT) [21] precoding scheme for space-time block coding- (STBC-)based multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) visible light communication (VLC) systems
We propose and experimentally demonstrate a novel MIMO-OFDM VLC system based on ZCT precoding, where spacetime block coding (STBC) is chosen as the MIMO mechanism to cope with the high channel correlation
Summary
Small size, good modulation performance, and low cost, white light-emitting diode (LED) is expected to be the recommended lighting equipment for the generation [1, 2]. To achieve a better solution, adaptive modulation design for STBC based on the MIMO-OFDM VLC system was studied in [16], where experimental results confirmed that data rates could be increased greatly without BER performance loss. An orthogonal circulant matrix transform (OCT) was proposed to avoid the feedback, by which uniform signal-to-noise ratio (SNR) could be achieved despite of the nonflat frequency response [18, 19] In this way, a similar BER performance is achieved compared with the traditional adaptive modulation scheme, but the feedback overhead can be reduced a lot. We propose and experimentally demonstrate a novel Zadoff–Chu matrix transform (ZCT) [21] precoding scheme for STBC-based MIMO-OFDM VLC systems.
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