Joint Detection In Td-scdma Uplink

TD-SCDMA,which combines the advantage of the time division duplex(TDD) with CDMA,makes use of many advanced techniques,such as Joint Detection,uplink synchronization,smart antenna and so on.TD-SCDMA is the most efficient in using the spectrum in the three main standards.There is important significance to research TD-SCDMA system now.Aiming at the key technology-Joint Detection of TD-SCDMA standard,this dissertation does a deeply and systemic theoretical analysis and research.And also, accomplishes the arithmetic's DSP realization test and verification.In the introduction,the dissertation gives the significance of research on Joint Detection algorithm,introduces several key technologies combining TD-SCDMA standard and at last analyzes the present situation and development of Joint Detection. After that,the dissertation builds up an uplink's continuous-time propagation model of the TD-SCDMA system and gives out the matrix denotation of discrete-time propagation model.Focus analysis is made on the construction of system matrix which is the kernel of Joint Detection,and then the dissertation introduces three common linear Joint Detection algorithms.Detailed introductions are made on the Joint Detection's algorithm based on Cholesky factorization operation and Fast Fourier Transforms operation of block-circulant matrix.Simulation results under different test environment,number of user equipments and antenna configure for Joint Detection algorithms are presented.The simulation explains the various factors on the performance of the Joint Detection.In order to estimate the performance of Fast Fourier Transforms operation of block-circulant matrix based algorithm,the dissertation sets up a simulation platform and describes the fix-point simulation part of the algorithm.Then the detailed analysis on simulation results is given.Based on the fix-point simulation,the dissertation describes the hardware implementation flow of Joint Detection algorithm on Freescale MSC8144 DSP.And algorithm realization and code optimization of some key modules are detailed given.At last the dissertation tests and verifies the whole project on MSC8144 ADS and lists performance parameters.According to these parameters,we can come to the conclution that on MSC8144 DSP,Fast Fourier Transforms operation of block-circulant matrix based algorithm can accomplish the processing of physical layer data on TD-SCDMA Node-B.At the last part of the dissertation,it does some conclutions on previous work and looks forward to the next step work.