Analysis of interference cancellation techniques in OFDMA systems employing adaptive antenna arrays |
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Authors: | A V Davydov A A Mal’tsev |
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Institution: | (1) Modern Telecommunication Institute, Beijing Jiaotong University, Beijing, 100044, China;(2) National Mobile Communications Research Laboratory, Southeast University, Nanjing, 210096, China |
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Abstract: | We analyze the problem of interference cancellation in OFDMA cellular communication systems employing adaptive antenna arrays
at the receiver and operating in the channels with frequency-selective fading and interference from the neighboring base stations.
This problem is very important for modern broadband cellular systems operating with a low coefficient of multiple use of frequencies.
Under such conditions of the network deployment, the system efficiency is restricted by the level of intrachannel interference
from the neighboring base stations transmitting in the same frequency channel. In this work, we analyze different methods
for measuring the interference characteristics and using them for spatial processing of received signals. Five different methods
for signal processing in an adaptive antenna array of the receiver are discussed. Each approach (reception method) has its
own interference immunity and complexity degree. Comparative analysis of the interference immunity of the considered receivers
has been performed for different frequency-channel loads and different numbers of interfering stations. Recommendations for
using the considered receivers are given. |
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Keywords: | |
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