【資料名稱】：Interference_Rejection_Combining_System_Performance

【資料作者】：Mats Dahlqvist

【資料日期】：2008

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

For cellular communication systems in urban areas, co-channel interference
is becoming a capacity limitation. Interference Rejection Combining (IRC)
is a technique used in an antenna diversity system to suppress co-channel
interference by using the cross covariance between the noise in diversity
channels.
The purpose of this thesis was to make an implementation of the IRC algorithm
for a xed point Digital Signal Processor (DSP) for GSM (Global
System for Mobile communication), and to evaluate the performance. First
an implementation was made in a C/C++ simulator. This implementation
was used as a reference for the DSP implementation, and also for evaluating
the performance of the DSP implementation. The DSP implementation
was carried out in an existing prototype platform to be able to evaluate the
performance in a real network.
The DSP implementation in this thesis shows a performance gain of  6
dB compared with MRC for a tu50 channel in an interference limited cell.
Previous studies of the IRC algorithm shows that the performance gain is
between 2{8 dB for such systems. For a ra250 channel the gain is  10 dB.
The drawback is that the performance for IRC is  0:5 dB worse compared
with MRC in a noise limited system. Performance evaluation has also shown
that the use of joint synchronization position is essential when using IRC.