IMD compensation for CDMA through FEC coding and nonlinearity recovery technique for optical fiber feeder system

Author

Yaqub, Raziq P. ; Nakagawa

Author_Institution

DDI Corp., Japan

fYear

1999

fDate

1999

Firstpage

382

Lastpage

387

Abstract

Optical feeding between base stations (BS) and radio network control (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 distortion (IMD) instituted by both the power amplifier (an electrical component) and the laser diode (an optical component). This IMD can impose strong limitations on CDMA and deteriorate system performance. In this paper IMD compensation is proposed through unification of FEC codes and a post nonlinearity recovery block (PNRB). System performance is evaluated through calculating the transfer functions of FEC codes, laser diode and PNRB. The transfer functions of the FEC codes are calculated by using the flow graph rules, and of the laser diode and PNRB through Volterra kernels. Performance of the PNRB alone for narrowband CDMA signals was sought in our previous work (Pervez and Nakagawa, 1996), whereas performance of PNRB combined with digital coding protection to compensate for the nonlinearities of the laser diode (LD) and power amplifier (PA) for wideband CDMA is pursued here

Keywords

cellular radio; code division multiple access; forward error correction; intermodulation distortion; nonlinear network analysis; nonlinear optics; optical fibre communication; power amplifiers; radiofrequency amplifiers; semiconductor lasers; telecommunication control; transfer functions; CDMA; FEC coding; IMD; IMD compensation; PNRB; Volterra kernels; base stations; digital coding protection; flow graph rules; intermodulation distortion; laser diode; narrowband CDMA signals; nonlinearity recovery technique; optical fiber feeder system; post nonlinearity recovery block; power amplifier; radio network control; third generation mobile systems; transfer functions; wideband CDMA mobile communication systems; Broadband amplifiers; Diode lasers; Multiaccess communication; Optical amplifiers; Optical distortion; Optical fiber networks; Power amplifiers; Stimulated emission; System performance; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Computers and Communications, 1999. Proceedings. IEEE International Symposium on

Conference_Location

Red Sea

Print_ISBN

0-7695-0250-4

Type

conf

DOI

10.1109/ISCC.1999.780925

Filename

780925