A Study On The Performance Of Space-Time Block Coding MR-MQAM/MPSK On Fading Channels

Hierarchical modulation(known also as embedded or multi-resolution modulation)can provide unequal error protection(UEP)and effectively transfer all kinds of multimedia information.The performance of hierarchical modulation in both flat fading channels and frequency selective fading channels has captured the attention of many researches.The diversity reception technique and multiple-input multiple-output(MIMO)technique are effective means to combat flat fading.The combination of MIMO technique with orthogonal frequency division multiplexing(OFDM)technique can overcome frequency selective fading with higher reliability of transmission.Multi-resolution(MR)data transmission system using adaptive scheduling protocal can guarantee the reliability of multimedia data over errorprone wireless channels.Therefore,this thesis investigates the performance of multi-resolution modultion system and multi-resolution data transmission system in fading channels.Chapter 1 is a review of multi-resolution modulation in fading chanmels.Chapter 2 first introduces the principles of multi-resolution modulation.Then the closed-form expressions for the average bit-error rate of MR-MPSK or/ana MQAM in both flat independent MIMO weibull fading channels and correlated MIMO Nakagami fading channels are derived.respectively.Finally,the expression for the approximate average bit-error rate of MR-MPSK/MQAM systems m weibull channels and the bounds for the average bit-error rate of MR-MPSK system in Nakagami channels are derived.The exact numerical results of average average bit-error rate match the simulation results very well.The approximate results/bounds of average bit-error rate can approach their corresponding exact values.Chapter 3 derives the exact expressions for the average bit-error rate of muti-resolution OFDM modulation systems in frequency selective independent Nakagami fading channels using maximal ratio combining(MRC)diversity and correlated MIMO Nakagami fading channels using space-time block codes.The numerical results are also provided in this chapter.Chapter 4 investigates the multi-resolution 4/16-QAM data transmission system in correlated MIMO Nakagami fading channels,the closed-form expressions for the average packet loss rate and packet tranmission rate of the system are derived when f-ading parameters is integer.The numerical results show that the MIMO technique based on space-time block codes could greatly decrease the average packet loss rate and increase the packet tranmission rate.Chapter 5 is the conclusion of this thesis.