Abstract
Optical Feedering between Base Stations (BS) and Radio Network Controller (RNC), proposed in this paper, is an efficient technique for third generation wideband CDMA mobile communication systems. The proposed technique provides the compensation to the Intermodulation Distortions (IMD) instituted by both, Power Amplifier (an electrical component), and Laser Diode (an optical component). These IMDs can impose strong limitations on CDMA and deteriorate system performance. In this paper IMD compensation is proposed through unification of FEC codes and Post Nonlinearity Recovery Block (PNRB). System Performance is evaluated through calculating the transfer functions of FEC codes, laser diode and PNRB. Transfer functions of FEC codes are calculated by using the flow graph rules, and of laser diode and PNRB through Voltera Kernels. Performance of PNRB alone for narrow band CDMA signals was sought in our previous work [1], whereas performance of PNRB combined with digital coding protection to compensate the nonlinearities of Laser Diode (LD) and Power Amplifier (PA) for wideband CDMA is pursued here.