Enhancement of LED indoor communications using OPPM-PWM modulation and grouped bit-flipping decoding.

Combination of overlapping pulse position modulation and pulse width modulation at the transmitter and grouped bit-flipping algorithm for low-density parity-check decoding at the receiver are proposed for visible Light Emitting Diode (LED) indoor communication system in this paper. The results demonstrate that, with the same Photodetector, the bit rate can be increased and the performance of the communication system can be improved by the scheme we proposed. Compared with the standard bit-flipping algorithm, the grouped bit-flipping algorithm can achieve more than 2.0 dB coding gain at bit error rate of 10-5. By optimizing the encoding of overlapping pulse position modulation and pulse width modulation symbol, the performance can be further improved. It is reasonably expected that the bit rate can be upgraded to 400 Mbit/s with a single available LED, thus transmission rate beyond 1 Gbit/s is foreseen by RGB LEDs.

[1]  Zhengyuan Xu,et al.  Joint LED dimming and high capacity visible light communication by overlapping PPM , 2010, The 19th Annual Wireless and Optical Communications Conference (WOCC 2010).

[2]  Xiangming Li,et al.  A proof of the Hadamard transform decoding of the belief propagation algorithm for LDPCC over GF(q) , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[3]  Jong Kyu Kim,et al.  Solid-State Light Sources Getting Smart , 2005, Science.

[4]  K. Langer,et al.  White Light Wireless Transmission at 200${+}$ Mb/s Net Data Rate by Use of Discrete-Multitone Modulation , 2009, IEEE Photonics Technology Letters.

[5]  Gottfried Ungerboeck,et al.  Channel coding with multilevel/phase signals , 1982, IEEE Trans. Inf. Theory.

[6]  Changyuan Yu,et al.  Performance improvement by tilting receiver plane in M-QAM OFDM visible light communications. , 2011, Optics express.

[7]  K. Habel,et al.  803 Mbit/s visible light WDM link based on DMT modulation of a single RGB LED luminary , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[8]  Seokjoo Shin,et al.  NRZ-OOK signaling with LED dimming for visible light communication link , 2011, 2011 16th European Conference on Networks and Optical Communications.

[9]  Hossam M. H. Shalaby.  Capacity and cutoff rate for optical overlapping pulse-position modulation channels , 1995, IEEE Trans. Commun..

[10]  David J. C. MacKay,et al.  Good Error-Correcting Codes Based on Very Sparse Matrices , 1997, IEEE Trans. Inf. Theory.

[11]  Changyuan Yu,et al.  Performance of a novel LED lamp arrangement to reduce SNR fluctuation for multi-user visible light communication systems. , 2012, Optics express.

[12]  Tao Jiang,et al.  Combine LDPC Codes Over GF(q) With q-ary Modulations for Bandwidth Efficient Transmission , 2008, IEEE Transactions on Broadcasting.

[13]  Thomas Sphicopoulos,et al.  Performance analysis of space time block coding techniques for indoor optical wireless systems , 2009, IEEE Journal on Selected Areas in Communications.

[14]  Dominic C. O'Brien,et al.  High data rate multiple input multiple output (MIMO) optical wireless communications using white led lighting , 2009, IEEE Journal on Selected Areas in Communications.