Td-scdma System, The Channel Estimation Technology And Dsp Implementation

TD-SCDMA, which combines the advantage of the time division duplex (TDD) with CDMA, makes use of many advanced techniques, such as smart antenna, Joint Detection and so on. But, these key technologies performance rely on the accuracy of channel estimation. It is very important to research the channel estimation technology for the realizing the whole TD-SCDMA system.Aiming at the channel estimation technology of TD-SCDMA standard, this dissertation does a deeply and systemic theoretical analysis and research. And this dissertation accomplishes the arithmetic's DSP realization of base station.This dissertation briefly introduces the main characters of the 3rd wireless communication system and the TD-SCDMA system in foreword, and analyses the research values and now's situation of channel estimation technology. Subsequently this dissertation analyses the characters and simulation method of mobile communication's wireless channel. A tapped delay line channel model is built and is used in space-time channel model widely adopted in simulation platform of the TD-SCDMA system. The coefficients of the TDL model are configured according to the suggestion of 3GPP's Multi-In-Multi-Out channel model. The newly built tapped delay line model includes the basic characters and main parameters of space-time channel, so the correctness and consistency of the TD-SCDMA model is ensured.This dissertation introduces channel estimation technology in wireless communication systems. It briefly describes the types of the channel estimation technology. It introduces two kinds of the channel estimation arithmetic and analyses both of the advantages and disadvantages of them.This dissertation sets up a TD-SCDMA uplink system discrete time transmit modle. And it intuduces the B.Steiner channel estimation arithmetic and its improved arithmetic of TD-SCDMA system.Finally, This dissertation simulates the transmitter, the wireless channel and the channel estimation modules of TD-SCDMA uplink baseband system, and realizes the channel estimation module on the multi-core DSP. The results shows the feasibility of the algorithm.