DSP Implementation of DMRS in PUSCH within the LTE System

Demodulation reference signal plays a very important role in channel estimation and equalization in the receiver within the LTE system. At beginning, this paper provides the various formulas that generate the demodulation reference signal (DMRS) in the physical uplink Shared channel (PUSCH), and then presents the design flow chart for programming realization. After that, Using TI(Texas Instruments corporation) TMS320C6455 DSP, it generates DMRS in PUSCH by software programming, using C and assembly language. Finally, this paper specifically describes the realization of division and exponentiation because it´s the hardest and most time-consuming operations in the DSP implementation. The method written in this paper has been applied to LTE-TDD wireless integrated test instrument development.