LDPC-Coded OFDM for Heterogeneous Access Optical Networks
This paper proposes a heterogeneous optical access networking scenario, in which communication links between source and destination nodes are heterogeneous, composed of free-space optical, Plastic Optical Fiber (POF), and Indoor Infrared (IR) links. To deal with bandwidth limitations of POF and IR links, a power-variable rate-adaptive Low-Density Parity-Check (LDPC)-coded Orthogonal Frequency Division Multiplexing (OFDM) scheme is used, while to deal with atmospheric turbulence, the spatial diversity is used. The rate-adaptive LDPC codes are designed using a Modified Progressive Edge-Growth (MPEG) algorithm. The paper shows that with the proposed heterogeneous communication systems, one can deliver a high-speed optical signal (40 Gb/s and beyond) to an end-user.