Abstract
With the demands of high data rate access network grow rapidly therefore it is difficult to design a cost-effective access network infrastructure. In the development of future 5G network, data rate, user number, uniform performance for each user and low cost network design will be important issues. In this thesis, we propose and demonstrate DDO-MC-CDMA PON in both simulation and experiment. The proposed PON structure can fit 20-100 km transmission distance with uniform performance. Generally, OFDM PON is implemented with double-side band intensity modulation because it’s a cost-effective design; however, it will induce serious RF power fading problem. So far, most designers focus on the transmitter design, in which adaptive modulation formats and subcarrier frequency allocation are applied in OLT for particular transmission distance. However, the maximum transmission channel capacity is achieved by adaptive design for dedicated transmission distance and RF power fading, the users in OFDM-PON still suffer unbalanced degradation and cannot enjoy the same received performance. Therefore, we employ a multi-carrier-CDMA(MC-CDMA) technique, which can not only even the degradation induced by RF power fading to each user, but also enhance the data security. Under an eight-user scheme, the maximum received power derivation for OFDM is 3.6dB, but is 0dB for MC-CDMA. It’s evident that all of the users get the same system performance in the proposed MC-CDMA PON. Besides, since all the users need the same received power to meet the FEC threshold, the power margin for proposed system will be substantially increased.