摘要
The symbol-error-rate（SER） and power allocation for hybrid cooperative（HC） transmission system are investigated.Closed-form SER expression is derived by using the moment generating function（MGF）-based approach.However,the resultant SER contains an MGF of the harmonic mean of two independent random variables（RVs）,which is not tractable in SER analysis.We present a simple MGF expression of the harmonic mean of two independent RVs which avoids the hypergeometric functions used commonly in previous studies.Using the simple MGF,closed-form SER for HC system with M-ary phase shift keying（M-PSK） signals is provided.Further,an approximation as well as an upper bound of the SER is presented.It is shown that the SER approximation is asymptotically tight.Based on the tight SER approximation,the power allocation of the HC system is investigated.It is shown that the optimal power allocation does not depend on the fading parameters of the source-destination（SD） channel and it only depends on the source-relay（SR） and relay-destination（RD） channels.Moreover,the performance gain of the power allocation depends on the ratio of the channel quality between RD and SR.With the increase of this ratio,more performance gain can be acquired.
The symbol-error-rate（SER） and power allocation for hybrid cooperative（HC） transmission system are investigated.Closed-form SER expression is derived by using the moment generating function（MGF）-based approach.However,the resultant SER contains an MGF of the harmonic mean of two independent random variables（RVs）,which is not tractable in SER analysis.We present a simple MGF expression of the harmonic mean of two independent RVs which avoids the hypergeometric functions used commonly in previous studies.Using the simple MGF,closed-form SER for HC system with M-ary phase shift keying（M-PSK） signals is provided.Further,an approximation as well as an upper bound of the SER is presented.It is shown that the SER approximation is asymptotically tight.Based on the tight SER approximation,the power allocation of the HC system is investigated.It is shown that the optimal power allocation does not depend on the fading parameters of the source-destination（SD） channel and it only depends on the source-relay（SR） and relay-destination（RD） channels.Moreover,the performance gain of the power allocation depends on the ratio of the channel quality between RD and SR.With the increase of this ratio,more performance gain can be acquired.
基金
supported by the National Basic Research Program of China (973 Program) (2010CB731803)
the National Science Foundation for Innovative Research Groups of China (60921001)
作者简介
Corresponding author:Guoyan Li was born in 1981.He received his M.S.degree in communication and information system from Dalian Maritime University,in 2008.Since then,he has been working towards the Ph.D.degree in information and communication engineering at Beihang University.His research interests include broadband wireless communication,MIMO and cooperative communication techniques.E-mail:lgy198211@ee.buaa.edu.cn;Youguang Zhang was born in 1963.He received his Ph.D.degree in electronics from Beihang University,in 1990.Since then,he has been with the School of Electronics and Information Engineering,Beihang University and currently holds an academic post of professor.His research interests include broadband wireless communication,MIMO and signal processing techniques.E-mail:zhangyouguang@vip.sina.com;Wang Kang was born in 1987.He received his B.S.degree in electronics from Beihang University,in 2009.He is now a Ph.D.candidate student in the School of Electronics and Information Engineering,Beihang University.His research interests include broadband wireless communication,dynamic resource allocation in wireless networks and cooperative and cognitive radio techniques.E-mail:kanebuaa@gmail.com.
