dietcha
2012-06-01, 03:45 PM
For OFDM based system with Single-Frequency Networking (SFN), ICI (inter-cell
interference), especially uplink ICI, becomes a
bottleneck to improve system performance. Since
the conventional interference management scheme
with OI (overload indicator) can not show the
instantaneous ICI, this paper proposes a method
to reduce ICI by utilizing channel reciprocity
of TD-LTE system. In the proposed scheme,
UE shall make a decision whether to reduce its
power or not after predicting the instantaneous
ICI level according to the scheduling results. The
system simulation results show that the proposed
scheme can reduce the uplink ICI effectively and
improve the system performance such as system
spectrum efficiency, 10% user throughput, 50%
user throughput, packet drop rate etc. significantly
while keep 5% cell edge user throughput loss
less than 5%. For example, the proposed scheme
improved system spectrum efficiency about 50%
and 50% user throughput gain is larger than 140%.
Meanwhile, the proposed scheme controls the
system ICI level and variance effectively. The
mean system ICI level and variance are reduced
by 4.5dB and 18dB respectively. The proposed
scheme can be joint implemented with those
existing ICI mitigation methods such as (soft)
frequency reuse, power control etc. to further
improve the system performance.
Key words: OFDM; SFN; ICI; channel reciprocity;
power control
http://www.google.com.vn/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CFYQFjAB&url=http%3A%2F%2Fwww.chinacommunications.cn%3A8080%2Fzgtx%2FEN%2Farticle%2FdownloadArticleFile.do%3FattachType%3DPDF%26id%3D7652&ei=0WXIT87OOsydiAfHiZkB&usg=AFQjCNGqgMZHIIbrkqbB6Cr87srjQLM2RA&sig2=ccS8Id3-43TBpTqagQLynQ
interference), especially uplink ICI, becomes a
bottleneck to improve system performance. Since
the conventional interference management scheme
with OI (overload indicator) can not show the
instantaneous ICI, this paper proposes a method
to reduce ICI by utilizing channel reciprocity
of TD-LTE system. In the proposed scheme,
UE shall make a decision whether to reduce its
power or not after predicting the instantaneous
ICI level according to the scheduling results. The
system simulation results show that the proposed
scheme can reduce the uplink ICI effectively and
improve the system performance such as system
spectrum efficiency, 10% user throughput, 50%
user throughput, packet drop rate etc. significantly
while keep 5% cell edge user throughput loss
less than 5%. For example, the proposed scheme
improved system spectrum efficiency about 50%
and 50% user throughput gain is larger than 140%.
Meanwhile, the proposed scheme controls the
system ICI level and variance effectively. The
mean system ICI level and variance are reduced
by 4.5dB and 18dB respectively. The proposed
scheme can be joint implemented with those
existing ICI mitigation methods such as (soft)
frequency reuse, power control etc. to further
improve the system performance.
Key words: OFDM; SFN; ICI; channel reciprocity;
power control
http://www.google.com.vn/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CFYQFjAB&url=http%3A%2F%2Fwww.chinacommunications.cn%3A8080%2Fzgtx%2FEN%2Farticle%2FdownloadArticleFile.do%3FattachType%3DPDF%26id%3D7652&ei=0WXIT87OOsydiAfHiZkB&usg=AFQjCNGqgMZHIIbrkqbB6Cr87srjQLM2RA&sig2=ccS8Id3-43TBpTqagQLynQ