應用於 IEEE 802.15.3c 規格之高面積效率萃式 (224,216) RS 解碼器

Abstract

隨著資料傳輸的頻寬不斷增加，未壓縮高品質影像傳輸的通訊系統設計成為 了一個有挑戰性的主題。根據 IEEE 802.15.3c 規格，在這樣的通訊系統必須使 用(224,216)的RS 解碼器。訊號在高速傳輸之下更顯脆弱，即使目前有少許可增 加錯誤更正能力的軟性解碼的方式例如Guruswami-Sudan 演算法、 Koetter-Vardy 演算法以及低複雜度萃式演算法被提出。這些方法仍然因為高硬 體複雜度以及速度過慢等問題而無法實現。 在論文中，我們提出了一個高速且高面積效率的萃式 (224,216)的RS 解碼 器。在錯誤更正能力上，相對於傳統RS 解碼器能在BER= −5 10 得到0.5dB 的效能 改善。根據在90nm 製程下的實驗結果，所提出的解碼器包含27.5k 的運算邏輯 閘。此解碼器的工作頻率最高為312.5MHz 並且能達到2.41Gb/s 的傳輸速度。

As the bandwith of data transmission advanced day by day, the communication system for uncompressed high-definition(HD) video streaming which requires high data rate is a challenging topic now. According to the IEEE 802.15.3c specification, a RS(224,216) decoder is specified in the uncompressed HD video streaming system. Since the signals under high-speed transmission will be more fragile, several techniques such as Guruswami- Sudan algorithm, Koetter-Vardy algorithm and Low-Complexity Chase algorithm are carried out to improve error-correcting ability of Reed-Solomon code. However, most of those method are still not preactical because of huge hardware cost and large critical path due to high complexity. In this thesis, we proposed an high-speed and area-efficient Chase-type (224,216) Reed- Solomon decoder that has a performance gain of 0.5dB at BER = 10−5 compared with conventional hard-decesion RS decoder. Implemented in UMC CMOS 90nm 1P9M pro- cess, the proposed decoder can reach 2.41Gb/s at 312.5MHz operation frequency with 27.5K gate count.