Effect of Optical Loss and Antenna Separation in 2 × 2 MIMO Fiber-Radio Systems

• Published in: IEEE transactions on antennas and propagation Vol. 58; no. 1; pp. 187 - 194
• Main Authors: KOBYAKOV, Andrey, SAUER, Michael, NG'OMA, Anthony, WINTERS, Jack H
• Format: Journal Article
• Language: English
• Published: New York, NY Institute of Electrical and Electronics Engineers 2010; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Applied sciences; Business and industry local networks; Eigenvalues; Exact sciences and technology; Fading; Fiber optics; Mathematical models; Networks and services in france and abroad; Optical fiber communications; Optical fibers; Optical telecommunications; Permissible error; Radiocommunications; Separation; Studies; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Transmitters; Transmitters. Receivers; Performance evaluation; Wireless LAN; Wireless telecommunication; Information rate; Transmitter; Eigenvalue; Cell network; Conditional probability; Wishart matrices; Optical losses; multiple-input multiple-output (MIMO) systems; Optical fiber network; Probability density function; Wishart matrix; Optical fiber communication; Antenna; Optical fiber; condition number; Mobile radiocommunication; MIMO system; Optical links; Channel capacity; Information transmission; picocellular networks; Statistical method; Upper bound; Optical connector; Relative error; Rayleigh fading; Personal communication networks; radio-over-fiber (RoF)
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2009.2036190

We study the impact of fiber-optic loss due to realistic cable deployment and optical connector loss variation and distance between the transmitter antennas in a radio-over-fiber transmission system with 2[Formula Omitted]2 MIMO. We evaluate an upper bound on the system capacity based on measured values of the error vector magnitude and the condition number of the channel matrix. For this, assuming a Rayleigh fading environment, we derive conditional probability density functions of eigenvalues of a 2[Formula Omitted]2 Wishart matrix. We compare the obtained results with another approach, which is based on IEEE 802.11 relations between the allowed relative constellation error and the achievable data rate for an individual stream. Trends predicted by both models agree very well. Our analysis shows that (i) about 1 meter spatial separation of fiber-fed transmitter antennas is optimum and results in the maximized system performance and (ii) the maximum tolerable optical power imbalance in two fiber optic links is about 6 dB.