A 60-GHz RoF System With Blind VSS-DD-LMS Equalizer for Optical-Wireless Transmission
Siming Liu, Guansheng Shen, Weiheng Zhang, Huiping Tian · IEEE Photonics Technology Letters · 2016
We experimentally demonstrate a 60-GHz radio over fiber (RoF) system utilizing a blind equalizer to improve the bit error rate performance. We propose a blind variable step-size decision-directed least mean square (VSS-DD-LMS) equalization algorithm with fast convergence speed. To the best of our knowledge, this is the first to apply a variable step size LMS blind equalizer in a 60-GHz RoF system. Using this algorithm, higher convergence speed and fewer iterations can be achieved simultaneously. Comparisons of our proposed algorithm with other existing algorithms in the designed RoF system are reported. The optimal value of the tap number is also investigated. A 5-Gb/s BPSK signal is successfully transmitted through a 10-km fiber and 1.2-m wireless link using our proposed blind VSS-DD-LMS equalizer under a forward error correction limit of 10-3.