數位電視地面廣播大多採用正交分頻多工技術，主要商用標準如歐規DVB-T/H、日規ISDB-T、美規MediaFlo及中規DMB-TH等，近期則有DVB-T之下世代DVB-T2規格之制定，正交分頻多工系統在抗多路徑寬頻無線傳輸方面具有極佳的優異性，且具有源自於多載波間正交性的高頻譜使用效率，然而當行動接收時，時變的通道響應將破壞其正交性而導致傳收性能下降，其程度正比於移動速度及載波頻率。本計畫即提出研究提昇數位電視廣播技術行動接收之研究，主要研究內容包括CP-OFDM(Pilot-Aided)及TDS-OFDM(PN-Aided)之時變通道估測、子載波間干擾減抑、時間與頻域交錯、結合通道資訊之通道解碼(Convolutional Code+RS Code: DVB-T/H及ISDB-T; LDPC Code+BCH Code: DMB-TH及DVB-T2)、多天線傳收多樣化等技術，並以PC配合FPGA平台發展軟硬體共模擬系統達到有效率實現以視訊傳收品質為最終性能指標之整體傳收(編碼,時域與頻域交織,調變,時變通道,通道估測與等化,時域與頻域解交織,通道解碼)性能驗證平台。 ; OFDM systems are adopted in most digital video broadcasting standards, such as DVB-T/H, ISDB-T, MediaFlo, DMB-TH and DVB-T2. OFDM systems are advantageous in combating multipath broadband wireless communications and spectral utilization efficiency, however the time-varying channel response caused by high mobility of transmitter or receiver will seriously degrade the performance by destroy the carrier orthogonality. The performance degradation is proportional to the speed and carrier frequency. Since mobile reception of digital video broadcasting is crucial, we therefore propose this project research on improved technologies for such application. The research works include mobile time-varying channel estimation for CP-OFDM (Pilot-Aided) and TDS-OFDM (PN-Aided), Inter-Carrier-Interference Cancellation, Time/Frequency Interleaving, Channel-State Assisted Channel Decoding (Convultional Code+ RS Code, LDPC Code+ BCH Code), and multiple TX/RX antennas diversity. This project will also implement a Quality-of-Service (Video Quality) based verification platform with a hardware/software Co-Emulator based on PC and FPGA platform. ; 研究期間 9808 ~ 9907
