Research Of V-BLAST Power Allocation And Adpative Modulation Based On Detect Order

LTE MIMO is one of the most promising solutions for getting multiplexing gainand enhacing data rate,especially Vertical Bell Labor.Layered Space-Time coding(V-BLAST) has become the first choice due to its simple transmitter structure andshorting efficiency resource.So,V-BLAST also has become one of importantsolutions for LTE wireless communication system.Many solutions for advancing theperformance of V-BLAST has proposed by many scholars,but the optimal solution isnot to bring up because of their Advantages and disadvantages. Many decodingalgorithms in common use and their application in the actual environment are to bechewed over and demonstrated by perfomance simulation based single and multi userV-BLAST system in the paper.Due to CSI is only known by the receving end not the transmitting end and thesame bit rate is allocated for each layer in the traditional V-BLAST structure,whichhave limited V-BLAST the actual use and bring it two shortcomings:one is errorpropagation.IF there is error for the fist detect layer,the detect error will be propagatedlayer by layer,So the later detect layer will be affected by the error propagation;Theother is delay.Delay is brought in order to attain successive interference cancellationwhich is needed to detect each layer in turn in the receiving end.Based on this,thepaper proposed a modulation rate and power allocation solution based on the simpledetect order of the receiving end,and it is got good theoretical analysis andperformance simulation in this paper...