The researching work of this thesis is mainly about the encoding and decoding schemes of the arrayed waveguide gratings and the bragg fiber gratings systems . firstly , the basic principle , system schemes and the key technologies are introduced in section one . the development , research status and trends of ocdma technologies are also summarized 本論文的第一章對ocdma系統(tǒng)進行了較為全面的綜述,對光碼分多址技術的基本原理和分類、編解碼結構方案以及關鍵技術進行了介紹,并對光碼分多址技術的發(fā)展和現(xiàn)狀進行了概述。
Due to the advantages of ldpc codes , their applications in reliable communications have received great interests and have become one of most attractive field in channel coding community . now , the application of ldpc has been put on the agenda . this thesis investigates some aspects of ldpc codes with emphasis on message passing algorithms and quantization decoding schemes of ldpc codes 由于低密度校驗碼具有諸多優(yōu)點,它在信息可靠傳輸中的良好應用前景已經(jīng)引起學術界和it業(yè)界的高度重視,成為當今信道編碼領域最受矚目的研究熱點之一,低密度校驗碼的應用也已經(jīng)被提到日程上。