title: A novel transform domain processing based channel estimation method for OFDM radio-over-fiber systems.
abstract: In this paper, a transform domain processing (TDP) based channel estimation method for orthogonal frequency-division multiplexing (OFDM) Radio-over-Fiber (RoF) systems is proposed. Theoretically investigation shows that TDP can greatly reduce the number of required training symbols. An 8 x 4.65 Gb/s multi-user OFDM RoF system over 40 km fiber link and 60 GHz wireless link is experimentally demonstrated utilizing TDP scheme. Compared with conventional time domain averaging (TDA) scheme, the overhead can be reduced from several tens of training symbols to merely one symbol and the receiver sensitivity has been improved by 1.8 dB at BER of 3.8 x 10(-3). The calculated BER performance for 8 wireless users clearly validates the feasibility of this TDP-based channel estimation method.
authors.affiliation: Department of Communication Science and Engineering, and State Key Lab of ASIC & System, Fudan University, Shanghai 200433, China.
authors.forename: Li
authors.initials: L
authors.lastname: Tao
authors.forename: Jianjun
authors.initials: J
authors.lastname: Yu
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Shao
authors.forename: Junwen
authors.initials: J
authors.lastname: Zhang
authors.forename: Nan
authors.initials: N
authors.lastname: Chi
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D011846:Radio Waves; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*