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QAM (quadrature amplitude modulation)
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Contents
QAM À̶õ
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ÀÌ·Ð
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Simulink¸¦ ÅëÇÑ ¼³°è
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ºÐ¼® ¹× °á·Ð
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QAM
QAMÀº µðÁöÅÐ ½ÅÈ£¸¦ ÀÏÁ¤·®¸¸Å ºÐ·ùÇÏ¿© ¹Ý¼ÛÆÄ ½ÅÈ£¿Í À§»óÀ» º¯È½ÃÅ°¸é¼ º¯Á¶½ÃÅ°´Â ¹æ¹ýÀÌ´Ù.
802.11b¹«¼± ÀÌ´õ³Ý(Wi-Fi) ¹× DVB(Digital Video Broadcast)¿Í °°Àº ÃֽŠÇÁ·ÎÅäÄÝÀº 64-QAM º¯Á¶¸¦ »ç¿ëÇÑ´Ù. ¶ÇÇÑ WiMAX, 802.11n ¹× HSDPA/HSUPA(»õ·Î¿î ÇÚµåÆù µ¥ÀÌÅÍ Ç¥ÁØ)
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MÁø QAM
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Simulink 16QAM º¯Á¶¿Í º¹Á¶
ºñÆ®¿¡·¯À² ÃøÁ¤
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°á·Ð
ÁÖ¾îÁø ´ë¿ª ³»¿¡¼, QAMÀº µ¿ÀÏÇÑ ºñÆ® ¿¡·¯À²¿¡¼ Ç°Áú
ÀúÇÏ ¾øÀÌ Ç¥ÁØÀûÀÎ PAM(ÆÞ½ºÁøÆøº¯Á¶)ÀÇ 2¹èÀÇ µ¥ÀÌÅ͸¦
Àü¼ÛÇÑ´Ù.
X¡ë[0:10];
%10log(ebno)¡ëX;
%log(ebno)¡ë0.1X;
ebno¡ë10.^(0.1X);
BERcurveQPSKawgn¡ë0.5erfc(sqrt(ebno)); % BER curve QPSK awgn
semilogy(X, BERcurveQPSKawgn,`r`);
BER16QAMa¡¦(»ý·«)
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