Design and experimental results for a spread-spectrum near-far interference-suppression device

Author

Pietsch, Werner ; Schubert, Michael

Author_Institution

Inst. fur Mobil- & Satellitenfunktech., Kamp-Lintfort, Germany

fYear

1994

fDate

18-23 Sep 1994

Firstpage

514

Abstract

The design and measured performance of an interference suppression device is described. The device is intended for usage in a non-power controlled CDMA system to reduce “near-far” effects. The device demodulates the chips of a strong interfering user and subtracts this locally generated interfering spread spectrum signal from the received signal. For large signal-to-noise ratios (SNR) the device reduces the interference considerably. The reduction is limited by the 20 dB dynamic-range of the passive power-combiner which is used for signal subtraction. The interference suppression capability degrades with decreasing SNR. For very low SNR the optimal receiver´s performance is found for turned off interference suppression

Keywords

code division multiple access; demodulation; interference suppression; spread spectrum communication; CDMA system; SNR; demodulation; design; experimental results; interference reduction; large signal-to-noise ratios; measured performance; near-far interference-suppression device; passive power-combiner; received signal; signal subtraction; spread spectrum signal; strong interfering user; Degradation; Frequency estimation; Interference suppression; Multiaccess communication; Multiple access interference; Phase locked loops; Semiconductor device measurement; Signal generators; Signal to noise ratio; Spread spectrum communication;

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.1994.529143

Filename

529143