VLSI Implementation Of Channel Coding In UWB Wireless Communication

Being a wireless radio communication technology suitable for short distance communication, UWB(Ultra-Wide Band)adapts ns pulse signal width with GHz signal frequency spectral and lower signal power. It becomes a hot point in the wireless radio communication area for its high distinguish ability, high intercepting ratio, more information content and detection ability on concealment. It is a key point to lower the error rate of transmission data in order to improve the reliability of communication. UWB system adapts the protocol which employs a (3,1,7) convolutional encoder and maximum likelihood Viterbi decoder in channel coding scheme when transmitting signal data.Firstly, the basic concept and development of UWB technology at home and abroad is introduced in the thesis. Specifically for the channel characteristic of UWB, traditional error correct scheme convolutional coding and Viterbi decoding is adopted.Secondly, consulting OFDM protocol, a (3,1,7) convolutional encoder and its Viterbi decoder is implemented, applying parallel mode, By using 4:2 compressors, the compare operations are concurrent with add operations in ACS unit. The circuit is described by Verilog Hardware Description Language, front simulated in ModelSim and some other tools. Soft decision information generated from Matlab simulation Platform resolves the difficulty of generating it. The thesis shows the simulation results of modules. Implementation of VLSI is used EDA tools.Finally, the (3,1,7) Viterbi decoder circuit is verified in 132MHz system clock frequency, the result shows that it works well. Compared with serial mode, the ACS scheme saves about 75% timing.