The first step in Multi-Standard Channel Decoder project is to build a system specification at several levels of abstraction in System C. Part of this work is channel modeling. Typically an impulse response model is used to simulate multi-path propagation. Clarke model is used to simulate Doppler fading in indoor propagation, while FIR model is directely used for outdoor model. System C is used to build independent modules, which are connected by master-slave ports, communicating with simple data flow. Three main modules are multi-path(to simulate the multi-path fading), SNR(to add white noise), ADC(to quantize the output). The major features of this architecture are:
1. Scalable and Flexible, one or more channels can be cascaded.
2. Channel simulation is independent of the Tx and Rx.
3. Build-in analysis can be provided.
4. User Extensible
Object Oriented methodology has been applied to maintain the data structure, making the functions concise, neat, reusable and reconfigurable. This model has been tested with a model of US DTV transmitter(8-VSB). Simulation results are available as time domain waveform and spectrum. The software has been delivered into MSCD project.
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