Abstract
A new scheme of radio-over-fiber (RoF) network based on spectral-amplitude-coding (SAC) optical code division multiple access (OCDMA) is herein proposed. Differential service is provided by a power control scheme that classifies users into several classes and assigns each of them with a specific power level. Additionally, the wavelength reuse technique is adapted to support bidirectional transmission and reduce base station (BS) cost. Both simulation and numerical results show that significantly differential quality-of-service (QoS) in bit-error rate (BER) is achieved in both downlink and uplink transmissions.
Highlights
Radio-over-fiber (RoF) supports broadband interconnections between base stations (BS’s) and the central office (CO) to release the heavy burden of wireless throughput [1,2,3,4]
Spectral amplitude coding (SAC) has been studied in many RoF schemes [3,4] since it is free from multiple access interference (MAI), and the data can be encoded on an optical carrier without pre-sampling
Numerical analysis according to Equation (10) and simulations done by OptisystemTM are both demonstrated
Summary
Radio-over-fiber (RoF) supports broadband interconnections between base stations (BS’s) and the central office (CO) to release the heavy burden of wireless throughput [1,2,3,4]. Optical time-division multiple access (TDMA) and wavelength-division multiple access (WDMA) are main schemes to multiplex signals from different users. Spectral amplitude coding (SAC) has been studied in many RoF schemes [3,4] since it is free from multiple access interference (MAI), and the data can be encoded on an optical carrier without pre-sampling. We propose a new system including two novel characteristics: supporting multi-service transmission and adapting wavelength reuse structure. These two issues have not been studied in previous research on SAC-based RoF. We propose a power control scheme that classifies the total users into several classes. The broadband light source (BLS) used for SAC encoding is not suitable for generating the optical millimeter, which is required by most wavelength reuse schemes.
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