Laser & Optoelectronics Progress, Volume. 48, Issue 10, 100602(2011)
Design of High Efficiency Modulater and Encoder Based on FPGA in FSO Communication System
Based on the characteristic of free space optical (FSO) channel and pulse position modulation (PPM) signal, by introducing turbo product code (TPC) in PPM modulation, the hardware circuit of the TPC-PPM coded modulation stucture is accomplished. Modulation gain and the code gain are tested experimentally, and it is proved that the design proposal is feasible. The experimental result indicates that under the condition that the information speed is 155.52 Mb/s, scintillation index σ2=0.1, modulation index M=4 and bit error ratio (BER) is 10-6, compared with the on-off keying (OOK) system, the PPM modulation principle prototype possessesa modulation gain of 9.03 dB and the code gain of TPC is more than 4.2 dB. The application of this module can greatly improve the performance of FSO communication system.
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Xu Jianwu, Wang Hongxing, Hu Hao, Liu Min. Design of High Efficiency Modulater and Encoder Based on FPGA in FSO Communication System[J]. Laser & Optoelectronics Progress, 2011, 48(10): 100602
Category: Fiber Optics and Optical Communications
Received: Mar. 3, 2011
Accepted: --
Published Online: Aug. 5, 2011
The Author Email: Jianwu Xu (xujianwu820215@126.com)