Title :
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
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;
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
DOI :
10.1109/WNCMF.1994.529143
