KEYWORDS: Signal to noise ratio, Radio over Fiber, Antennas, Optical engineering, Systems modeling, Computing systems, Computer simulations, Control systems, Multiplexing, Modulation
This paper proposes a radio-on-fiber (RoF) radio-space transmission system. We consider the orthogonal frequency- and space-division multiple access system, in which the orthogonal frequency-division multiple access (OFDMA) and space-division multiple access (SDMA) are combined. In this system, two frequency-channel scheduling schemes are also proposed for OFDMA, and two grouping methods are proposed for SDMA. The performance of the proposed systems is analyzed by computational simulations. It is shown that the random grouping method does not degrade the performance compared with a more complicated grouping method. In the proposed frequency-channel scheduling schemes, the control station estimates all users' signal-to-noise ratios (SNRs), and these schemes allow the system to assign subcarriers to different users according to their channel conditions so that each user can transmit on subcarriers where it has high SNR. Simulation results show that users can avoid frequency-selective fading and achieve higher bit-error-rate performance.
KEYWORDS: Radio over Fiber, Antennas, Signal detection, Computer simulations, Video, Systems modeling, Computing systems, Signal processing, Modulation, Electrical to optical converters
This paper proposes new resource management schemes for multiple data streams in an orthogonal frequency and space division multiplex access (OFSDMA) system using Radio-on-Fiber (RoF) ubiquitous antennas. The proposed schemes classify the services into some classes in which the number of sub-carriers is dynamically assigned according to the requested data rate. The computer simulation results show that the proposed schemes improve the number of users satisfying the required bit error rate (BER) level as well as the average throughput and also show that the RoF ubiquitous antennas can improve system capacity.
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