TY - JOUR
T1 - Network coding with diversity and outdated channel state information
AU - Chen, Tong
AU - Cumanan, Kanapathippillai
AU - Ding, Zhiguo
AU - Tian, Guiyun
N1 - Funding Information:
This work was funded by the EPSRC of UK under Grant EP/I037423/1.
PY - 2012/12
Y1 - 2012/12
N2 - Physical-layer network coding (PNC) has the potential to significantly improve the throughput of wireless networks where the channels can be modeled as additive white Gaussian noise (AWGN) channel. As extending to multiple channels, this technique requires both amplitude and phase compensation at each transmitter and will lead to inefficient systems yielding no diversity even with perfect channel state information (CSI). In order to avoid these limitations, we apply network coding with diversity (NCD) to achieve a form of selection diversity and extend NCD to cooperative multiple access channels in this paper. However, in practical wireless communication systems, the CSI could become outdated due to the difference between the CSI used in the relay selection and data transmission phases. Hence, the selected relay may not be the best one during data transmission phase due to the dynamic change in the wireless channels. Therefore, we first explore the relation between the present and past CSIs. Exploiting this relationship, the NCD scheme with outdated CSI is investigated based on the past CSI. To evaluate the performance of this scheme, an information-theoretic metric, namely the outage capacity, is studied under this condition.
AB - Physical-layer network coding (PNC) has the potential to significantly improve the throughput of wireless networks where the channels can be modeled as additive white Gaussian noise (AWGN) channel. As extending to multiple channels, this technique requires both amplitude and phase compensation at each transmitter and will lead to inefficient systems yielding no diversity even with perfect channel state information (CSI). In order to avoid these limitations, we apply network coding with diversity (NCD) to achieve a form of selection diversity and extend NCD to cooperative multiple access channels in this paper. However, in practical wireless communication systems, the CSI could become outdated due to the difference between the CSI used in the relay selection and data transmission phases. Hence, the selected relay may not be the best one during data transmission phase due to the dynamic change in the wireless channels. Therefore, we first explore the relation between the present and past CSIs. Exploiting this relationship, the NCD scheme with outdated CSI is investigated based on the past CSI. To evaluate the performance of this scheme, an information-theoretic metric, namely the outage capacity, is studied under this condition.
KW - Channel state information (CSI)
KW - Cooperative multiple access channels
KW - Network coding with diversity (NCD)
UR - http://www.scopus.com/inward/record.url?scp=84872779572&partnerID=8YFLogxK
U2 - 10.3969/j.issn.2095-087X.2012.04.011
DO - 10.3969/j.issn.2095-087X.2012.04.011
M3 - Article
AN - SCOPUS:84872779572
SN - 2095-087X
VL - 20
SP - 261
EP - 267
JO - Journal of Modern Transportation
JF - Journal of Modern Transportation
IS - 4
ER -