GRAKE接收机增强吞吐量的方法

maple2006

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maple2006

In a multipath fading channel, when there are many interfering CDMA signals, the
multipath causes loss of orthogonality between different signals leading to intracell interference.
The Generalized RAKE receiver, proposed recently in the literature, is based on the
concept that this interference is not white but colored. Therefore, unlike the conventional
RAKE receiver, GRAKE tries to match to the channel as well as whiten the interference.
The GRAKE gives a typical improvement of 1-3 dB in SNR for a moderate increase in
complexity.
In this paper, we quantify the benefits of using the GRAKE in place of the RAKE
in a WCDMA downlink under realistic conditions as specified in the 3GPP standards. The
comparison is made both in the presence and absence of channel coding. After performing
channel coding, the block error rate and hence the system throughput is evaluated for both
receivers in a 144 kbps test case. It is demonstrated that the GRAKE provides significant
improvement in BER performance, which translates to higher data throughput, as well as
increased capacity.