Intermodulation in CDMA

Author

Chu, T.S.

Author_Institution

Crawford Hill Lab., AT&T Bell Labs., Holmdel, NJ, USA

fYear

1994

fDate

18-23 Sep 1994

Firstpage

595

Abstract

Using a soft limiter of the error function type, the authors have applied the time domain Fourier expansion method to analyze intermodulation in multiplexing of CDMA signals. The individual three-tone third-order intermodulation component, normalized with respect to the signal in CDMA, has the same magnitude as that in FDMA except for the reduction by the processing gain. The intermodulation components in FDMA are distributed among all the frequency channels, whereas all the intermodulation components fall on each CDMA channel in a radio carrier band. In practical cases the intermodulation to signal ratio in CDMA is only slightly lower than that in FDMA. However, a CDMA system with digital coding protection and RAKE receiver is expected to need less signal power

Keywords

Fourier analysis; code division multiple access; digital radio; encoding; intermodulation; multiplexing; time-domain analysis; CDMA; RAKE receive; digital coding protection; error function; intermodulation; intermodulation to signal ratio; multiplexing; processing gain; radio carrier band; signal power; soft limiter; three-tone third-order intermodulation component; time domain Fourier expansion method; Fading; Fourier transforms; Frequency division multiaccess; Limiting; Linearity; Multiaccess communication; Multipath channels; Power system protection; Signal processing; Time division multiple access;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 1994. Wireless Networks - Catching the Mobile Future., 5th IEEE International Symposium on

Conference_Location

The Hague

Print_ISBN

90-5199-193-2

Type

conf

DOI

10.1109/WNCMF.1994.529159

Filename

529159