Higher Order Adaptive Filter Based Predistortion for Nonlinear Distortion Compensation of Radio over Fiber Links

 The biggest limitation of Radio over Fiber (ROF) links in a wireless network is its limited dynamic range due to ‘Non Linear Distortions’ (NLD). In this paper a higher order adaptive filter based modeling and predistortion scheme is proposed to compensate this NLD. The filter is adapted from the distortions of vectormodulated symbols, so that no in-depth knowledge of physical link parameters is needed. Experimental and simulation results show that a third order filter accurately models the ROF link while a second order filter adequately compensates for the phase nonlinearity. The power handling capability of the laser diode is the upper limit in this approach. Key Words  Nonlinear distortion, Adaptive Filters, Communication system nonlinearities, Optical fiber communications, Indoor radio communications and Compensation.

• Type: Conference
• Year: 2000
• Where: ICC
• Authors: Xavier N. Fernando, Abu B. Sesay
• Keywords: Adaptive Filters, Communications, ICC 2000, Order Adaptive Filter, Order Filter