Performance of parallel decodable turob and repeat-accumulate codes implemented on an fpga platform


Thesis Type: Postgraduate

Institution Of The Thesis: Middle East Technical University, Faculty of Engineering, Department of Electrical and Electronics Engineering, Turkey

Approval Date: 2009

Thesis Language: English

Student: Enes Erdin

Supervisor: ALİ ÖZGÜR YILMAZ

Abstract:

In this thesis, we discuss the implementation of a low latency decoding algorithm for turbo codes and repeat accumulate codes and compare the implementation results in terms of maximum available clock speed, resource consumption, error correction performance, and the data (information bit) rate. In order to decrease the latency a parallelized decoder structure is introduced for these mentioned codes and the results are obtained by implementing the decoders on a field programmable gate array. The memory collision problem is avoided by using collision-free interleavers. Through a proposed quantization scheme and normalization approximations, computational issues are handled for overcoming the overflow and underflow issues in a fixed point arithmetic. Also, the effect of different implementation styles are observed.