Theoretical and experimental design of an alternative system to 2×2 MIMO for LTE over 60 km directly modulated RoF link

Relay nodes (RN) are used as an important structure to extend the coverage of the Third Generation Partnership Program's Long Term Evolution (3GPP-LTE). The promising technology as the interface between eNodeB (eNB) and RN is radio-over-fibre (RoF), due to its longer span transmission capability. In this paper, we propose an alternative technique to 2×2 multiple-input and multiple-output (MIMO) in LTE structure for transmission over 60 km directly modulated RoF link by introducing frequency division multiplexing (FDM) for orthogonal FDM (OFDM). The system is demonstrated theoretically and experimentally. In the baseband, quadrature phase shift keying (QPSK), 16-quadrature amplitude modulation (QAM) and 64-QAM are considered as the single carrier modulations (SCM) according to the LTE standard. The system degradation pattern is identical between the theoretical and experimental system, thus proving the accuracy of the theoretical system design. The real time QPSK, 16-QAM and 64-QAM system achieved an average EVM of 5.84%, 5.90% and 5.97%, respectively for 2GHz and 2.6 GHz bands. These resultant EVMs are below the 8% 3GPP-LTE EVM requirement.

[1]  Min Wang,et al.  Handover within 3GPP LTE: Design Principles and Performance , 2009, 2009 IEEE 70th Vehicular Technology Conference Fall.

[2]  Bruno Clerckx,et al.  3GPP LTE and LTE-Advanced , 2009, EURASIP J. Wirel. Commun. Netw..

[3]  Chin-Pang Liu,et al.  Transmission of Wireless MIMO-Type Signals Over a Single Optical Fiber Without WDM , 2010, IEEE Transactions on Microwave Theory and Techniques.

[4]  W. C. Liu,et al.  CPW-fed compact meandered patch antenna for dual-band operation , 2004 .

[5]  Kien T. Truong,et al.  Relay Architectures for 3GPP LTE-Advanced , 2009, EURASIP J. Wirel. Commun. Netw..

[6]  R P Giddings,et al.  Negative Power Penalties of Optical OFDM Signal Transmissions in Directly Modulated DFB Laser-Based IMDD Systems Incorporating Negative Dispersion Fibers , 2010, IEEE Photonics Journal.

[7]  V. Polo,et al.  On the use of fiber-induced self-phase modulation to reduce chromatic dispersion effects in microwave/millimeter-wave optical systems , 1998, IEEE Photonics Technology Letters.

[8]  Georgios Ellinas,et al.  On the Vision of Complete Fixed-Mobile Convergence , 2010, Journal of Lightwave Technology.

[9]  Z. Ghassemlooy,et al.  Optimization of Optical Modulator for LTE RoF in Nonlinear Fiber Propagation , 2012, IEEE Photonics Technology Letters.

[10]  Jaehoon Lee,et al.  Radio-Over-Fiber System for TDD-Based OFDMA Wireless Communication Systems , 2007, Journal of Lightwave Technology.

[11]  Itsuro Morita,et al.  16x52.5-Gb/s, 50-GHz spaced, POLMUX-CO-OFDM transmission over 4,160 km of SSMF enabled by MIMO processing , 2011 .

[12]  Atsushi Takada,et al.  Electro-optically multiplexed 110 Gbit/s optical OFDM signal transmission over 80 km SMF without dispersion compensation , 2008 .

[13]  Zabih Ghassemlooy,et al.  FFT size optimization for LTE RoF in nonlinear fibre propagation , 2012, 2012 8th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP).