A Study On The Error Performance And RCEE Of TAS-OSTBC Over MIMO Fading Channels

The perfect channel state information(CSI)is difficult to obtain due to factors such as feedback delay and channel estimation error,and the performance of wireless communication system with transmit antenna selection(TAS)-orthogonal space time block coding(OSTBC)will be degradated in the presence of non-ideal CSI.The minimum mean square error(MMSE)Wiener channel predictor is an effective measure to mitigate the impact of feedback delay and imperfect channel estimation on wireless communication system with TAS-OSTBC.For this reason,the error performance of wireless communication system using predictive TAS(TASP)-OSTBC over Rayleigh block fading channel in the case with non-linear high-power amplifiers(HPA)was studied in this thesis.When the information transmission rate is lower than the channel capacity,the error probability for system can be arbitrarily small if the codeword length tends to infinity.On the other hand,for most practical scenarios,the codeword length cannot be too long because of the limitations on delay and encoding/decoding complexity.For this reason,it is necessary to find a compromise between the error probability and codeword length.When the information transmission rate is lower than the channel capacity,random coding error exponent(RCEE)which was presented by Gallager can provide insight into the decay rate of error probability with the change of codeword length,and can determine the required codeword length for a given error probability,then analyze the encoding/decoding implementation complexity trade-off problem with given reliability constraints.Therefore,the RCEE for wireless communication system with TASP-OSTBC on Rayleigh block fading channel was studied in this thesis.A brief review of TAS-OSTBC on fading channel was presented firstly in chapter 1,then a brief review of channel prediction on fading channel was presented,and a brief review of RCEE on fading channel was presented finally.The approximate and asymptotic expressions for the average symbol error rate(ASER)of rectangular quadrature amplitude modulation(RQAM)using TAS with feedback delay(TASD)-OSTBC over Nakagami fading channel were derived in chapter 2.The theoretical calculation and simulation results show that the feedback delay reduces the diversity gain of wireless communication system with TASD-OSTBC.The exact and approximate analytical expressions for the ASER of differentially encoded quadrature phase-shift keying,RQAM and cross M-ary quadrature amplitude modulation with TASP-OSTBC over Rayleigh block fading channel were derived in chapter 3,where there are non-linear high-power amplifiers,and then the asymptotic ASER analytical expressions of RQAM was also derived.The theoretical calculation and simulation results show that channel prediction can improve the error performance of wireless communication system with TASP-OSTBC by coding gain.The analytical expressions of RCEE,ergodic capacity,cutoff rate and expurgated exponent of wireless communication system using TASP-OSTBC over Rayleigh block fading channel were derived in chapter 4.The expressions obtained above can be used to quickly analyze the influence of the number of transmit or receive antenna,the block length and the parameters of MMSE channel predictor on the RCEE,capacity,cutoff rate and expurgated exponent The trade-off problem of the above parameters was also analyzed.Chapter 5 is the conclusion of this thesis.