Design And Implementation Of RS Decoder In CMMB

Wireless communication is developing rapidly and many new services appeared. Mobile TV as a new service will bring a new experience to us. We can watch TV either at an airport, a park, a department or in taxi in the future. CMMB is a standard of mobile TV developed by China. It stands for the intellectual property of China and will be used widely.CMMB signal is transmitted wirelessly. For receive the correct information, forward error correction is necessary. RS coding is an important channel coding technology. It has a good performance at error correction. Concatenated with byte interleaving, it works well especially for burst error. RS and LDPC coding is used as part of FEC in CMMB system.In this thesis, we focused on the design of RS decoder. CMMB receiver is equipped on mobile device. The data rate is not very high, so decoding speed is not very important for our decoder. Low power consumption is necessary because mobile device always powered by a battery. The design described in this thesis is focused on low power and low area, while this design may slow down the decoding speed.We introduced some RS decoding algorithm and compare them. Finally we choose the MEA algorithm as the base of our design. After referenced some papers on RS decoder, we designed each sub modules of RS decoder. According to analysis of algorithm, syndrome computation circuit is modified for decreasing power consumption, and the area is almost not increased. MEA circuit is designed for low power while slowing down the decoding speed. The last part is the error location and error value computation circuit and typical design is used for this part. Considering the structure of CMMB receiver, delay cell is not used in this design. This brings us low area and low power. At last, we implemented designs mentioned in this thesis on Verilog language. Synthesis and simulation is done for these designs and the result proves that the design in this thesis is available.