The design and implementation ofDigital Modulation QAM systemand Error correction

• Main Authors: Fu-Gwo Tsai, 蔡富國
• Other Authors: Hsia Shih-Chang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/31972373837295699783

碩士 === 國立高雄第一科技大學 === 電腦與通訊工程所 === 90 === Being the booming development of radio communication these years, from Ampli- tude Modulation( AM), and frequency Modulation( FM), Phase Modulation ( PM), till now the digital Modulation ASK, FSK, PSK, the innovation of new technique applied in the data communication widely. Although the radio signal can be applied to transmit data in the air, but interfered with noises, affected by multi path transmission and signal fading, the wireless radio itself is one of unstable transmission media during the process of signal transmission. So these factors affected the quality of wireless data communication while the come out of wireless communication errors are common. In order to conquer the weakness of radio data transmission, we improve the radio signal quality with digital modulation and the technique of forward error correction( FEC) to restore the message by channel coding , reduced the re-transmit of signal and avoid the meaningless depletion of bandwidth resources. In this thesis, deliver the main method of applied aspect to have in the data of wireless data transmission in following point: １, Revise the errors created in the process of radio transmission by applied the BCH technique and increase transmission efficiency. ２, Apply the technique of QAM , come completing the signal transmission in limited bandwidth. ３ ,Quote from the POCSAG protocol to correspond by letter the pact to come to procedure that complete data of wireless data transmission. ４ ,To make microprocessor control the CODEC by constructing the interface of microprocessor, and complete the send and receive of digital data、modulation and demodulation of radio signal , and the function of two way data communication . At last, Construct a full function platform to verify the theory of those techniques and study more.