TransmissionofLTEOveraDWDM方案.PDFVIP

8 J. OPT. COMMUN. NETW./VOL. 6, NO. 1/JANUARY 2014 Kanesan et al. Experimental Full Duplex Simultaneous Transmission of LTE Over a DWDM Directly Modulated RoF System Thavamaran Kanesan, Wai Pang Ng, Zabih Ghassemlooy, and Chao Lu Abstract—In this paper, we experimentally demonstrate eNodeB (eNB) is the base station for LTE, designed with the seamless integration of full duplex system frequency division duplex (FDD) long-term evolution (LTE) technol- integrated functionality of a radio network controller, ogy with radio over fiber (RoF) for eNodeB (eNB) coverage base station controller, and radio access network, thereby extension. LTE is composed of quadrature phase-shift key- making it a complex, computationally intensive, and costly ing (QPSK), 16-quadrature amplitude modulation (16-QAM) structure [2]. In addition, the LTE operating carrier fre- and 64-QAM, modulated onto orthogonal frequency divi- sion multiplexing (OFDM) and single-carrier-frequency quency in the urban area is 2.6 GHz, which imposes higher division multiplexing for downlink (DL) and uplink (UL) loss in wireless propagation and therefore limits the cell transmissions, respectively. The RoF system is composed edge to about 1 km radius due to the degradation of the of dedicated directly modulated lasers for DL and UL with signal-to-noise ratio (SNR) [3]. The deterioration of SNR dense wavelength division multiplexing (DWDM) for in- stantaneous connections and for Rayleigh backscattering at the cell edge has resulted in the user equipment (UE) and nonlinear interference mitigation. DL and UL signals