國立臺灣大學電信工程學研究所陳光禎2006-07-262018-07-052006-07-262018-07-052001-07-31http://ntur.lib.ntu.edu.tw//handle/246246/20207殘餘符際干擾與過大的極均功率比是兩個正 交分頻多工系統中為人熟知的問題。我們提 出一種名為『多載波平行決策回授解碼』的 方法以消除殘餘符際干擾，這個方法基於『簡 化狀態序列估測』的概念，可在正交分頻多 工系統中結合柵欄碼調變與決策回授等化。 其傑出效能可藉由數個基於不同的子載波數 目、通道環境、柵欄碼調變方式的模擬結果 得到證明。另外，我們也定義了影響極均功 率比的相關參數並且推導了不同柵欄碼調變 方式之極均功率比的適當上下限來研究如何 縮減極均功率比。再者，為了探索正交分頻 多工系統的可行性並且應用軟體無線電的概 念， 我們設計並且實作兩個以德儀 TMS320C6201 數位訊號處理器的發展電路板 為基礎的收發器來建構一個整合的具有軟體 無線電架構的適調速率正交分頻多工通訊系 統。這個可程式化的架構可為將來更先進的 正交分頻多工系統的發展提供一個彈性化的 實作平台。Residual intersymbol interference (ISI) and large peak-to-average (PAP) power ratio are two well-known problems in orthogonal frequency division multiplexing (OFDM) systems. We propose an approach named “multi-carrier parallel decision feedback decoder” (MC-PDFD) based on the concept of “reduced state sequence estimation” (RSSE) to combine trellis-code modulation (TCM) and decision feedback equalization (DFE) in OFDM systems. The excellent performance of MC-PDFD to remove residual ISI is convinced by several simulation results with different number of subcarriers, channel conditions, and trellis-coded modulation techniques. In addition, the related parameters that affect the value of PAP ratio are defined and the proper upper and lower bounds for different trellis-coded modulation schemes are derived to investigate the reduction of PAP. Furthermore, to explore the feasibility of OFDM systems and the concept of software radio, we design and implement two transceivers based on the EVM board with TI’s TMS320C6201 DSP to constitute an integrated rate-adaptive OFDM communication system with software radio architecture. This programmable architecture shall provide a flexible implementation platform for future developments of advanced OFDM systems.application/pdf137794 bytesapplication/pdfzh-TW國立臺灣大學電信工程學研究所正交分頻多工殘餘符際干擾極 均功率比柵欄碼調變多維度柵欄碼調變決策回授等化多路徑衰退適調速率編 碼同步等化TMS320C62TLC5540THS3001TLC7524THS4001OFDMresidual ISIPAPTCMmulti-dimensional TCMDFEmultipath fadingrate-adaptivecodingsynchronizationequalizationreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/20207/1/892213E002120.pdf