MER: ʻO ka lākiō hewa modulation, ʻo ia ka ratio o ka waiwai kūpono o ka nui vector i ka waiwai kūpono o ka nui o ka hewa ma ke kiʻikuhi constellation (ka lakio o ka huinahā o ka nui vector kūpono i ka huinahā o ka nui vector hala) .ʻO ia kekahi o nā hōʻailona nui e ana i ka maikaʻi o nā hōʻailona TV kikohoʻe.He mea koʻikoʻi loa ia i nā hualoaʻa ana logarithmic o ka distortion superimposed ma ka hōʻailona modulation kikohoʻe.Ua like ia me ka ratio signal-to-noise a i ʻole carrier-to-noise ratio i hoʻohana ʻia ma ka ʻōnaehana analog.He ʻōnaehana hoʻokolokolo He ʻāpana koʻikoʻi o ka hoʻomanawanui ʻole.Nā hōʻailona like ʻē aʻe e like me BER bit error rate, C/N carrier-to-noise ratio, power level average power, constellation diagram, etc.
Hōʻike ʻia ka waiwai o MER ma dB, a ʻoi aku ka nui o ka waiwai o MER, ʻoi aku ka maikaʻi o ka hōʻailona.ʻOi aku ka maikaʻi o ka hōʻailona, ʻoi aku ka pili o nā hōʻailona modulated i ke kūlana kūpono, a me ka hope.Hōʻike ka hopena hoʻāʻo o MER i ka hiki o ka mea hoʻokipa kikohoʻe ke hoʻihoʻi i ka helu binary, a aia kahi ʻano hōʻailona-a-noise ratio (S/N) e like me ka hōʻailona baseband.Hoʻopukaʻia ka hōʻailona QAM-modulated mai ka hopena mua a komo i ka home ma o ka pūnaewele komo.E emi mālie ka hōʻailona MER.I ka hihia o ka constellation diagram 64QAM, ʻo 23.5dB ka waiwai paepae empirical o MER, a ma 256QAM he 28.5dB (pono ka puka mua-hope inā ʻoi aku ia ma mua o 34dB, hiki iā ia ke hōʻoia i ke komo ʻana o ka hōʻailona i ka home maʻamau. , akā, ʻaʻole ia e hoʻokaʻawale i nā mea ʻino i hana ʻia e ka maikaʻi o ke kaula hoʻouna a i ʻole ka hope sub-front).Inā ʻoi aku ka haʻahaʻa ma mua o kēia waiwai, ʻaʻole e laka ʻia ke kiʻikuhi o nā hōkū.MER hōʻike mua-hope modulation pono puka: No 64/256QAM, mua-hope > 38dB, sub-mua-hope > 36dB, optical node > 34dB, amplifier > 34dB (kekona he 33dB), mea hoʻohana hope > 31dB (kekona he 33dB ), ma luna o 5 Hoʻohana pinepine ʻia kahi kī MER no ka ʻimi ʻana i nā pilikia laina TV.
Manaʻo ʻia ka manaʻo nui o MER MER ma ke ʻano he ana SNR, a ʻo ke ʻano o MER:
①.Loaʻa iā ia nā ʻano pōʻino like ʻole i ka hōʻailona: ka walaʻau, ka leaka o ka mea lawe, IQ amplitude imbalance, a me ka walaʻau.
②.Hōʻike ia i ka hiki o nā hana kikohoʻe e hoʻihoʻi i nā helu binary;hōʻike ia i ke kiʻekiʻe o ka pōʻino i nā hōʻailona TV kikohoʻe ma hope o ka hoʻouna ʻia ʻana ma o ka pūnaewele.
③.ʻO SNR kahi ʻāpana baseband, a ʻo MER kahi ʻāpana lekiō.
Ke hoʻohaʻahaʻa ka maikaʻi o ka hōʻailona i kekahi pae, e hoʻololi hewa ʻia nā hōʻailona.I kēia manawa, piʻi ka helu bit error rate BER.BER (Bit Error Rate): Bit error rate, i wehewehe ʻia e like me ka ratio o ka helu o nā ʻāpana hewa i ka huina o nā ʻāpana.No nā hōʻailona kikohoʻe binary, ʻoiai ua hoʻouna ʻia nā bits binary, ua kapa ʻia ka hapa hapa hapa ʻo ka bit error rate (BER).
BER = Hapa Kuhikuhi/Ka huina Bit Rahi.
Hōʻike ʻia ʻo BER ma ka notation ʻepekema, a ʻo ka haʻahaʻa o ka BER, ʻoi aku ka maikaʻi.Ke maikaʻi loa ka maikaʻi o ka hōʻailona, ua like nā helu BER ma mua a ma hope o ka hoʻoponopono hewa;akā i ka hihia o kekahi keakea, ʻokoʻa nā helu BER ma mua a ma hope o ka hoʻoponopono hewa ʻana, a ma hope o ka hoʻoponopono hewa He haʻahaʻa ka hapa hapa.Ke 2×10-4 ka hapa hapa, ʻike ʻia ka hapa mosaic i kekahi manawa, akā hiki ke nānā ʻia;ʻo ka BER koʻikoʻi ʻo 1 × 10-4, ʻike ʻia ka nui o nā mosaics, a ʻike ʻia ka pāʻani kiʻi i ka manawa pōkole;ʻAʻole hiki ke nānā ʻia ka BER ʻoi aku ma mua o 1 × 10-3.kiai.ʻO ka helu BER index wale nō ka waiwai kuhikuhi a ʻaʻole i hōʻike piha i ke kūlana o nā lako pūnaewele holoʻokoʻa.ʻO kekahi manawa ma muli o ka piʻi koke ʻana ma muli o ke keakea koke ʻana, ʻoiai ʻo MER ke kūʻē loa.Hiki ke hoʻohana ʻia ke kaʻina holoʻokoʻa ma ke ʻano he ʻikepili kuhi hewa.No laila, hiki i ka MER ke hāʻawi i ka ʻōlelo aʻo mua no nā hōʻailona.Ke emi ka maikaʻi o ka hōʻailona, e emi ana ka MER.Me ka piʻi ʻana o ka walaʻau a me ke keakea ʻana i kekahi ʻano, e emi mālie ka MER, ʻoiai ʻaʻole i loli ka BER.Ke piʻi aʻe ke keʻakeʻa ʻana i kekahi ʻano, hoʻomaka ka MER ʻO ka BER e hōʻemi i ka wā e hāʻule mau ai ka MER.Ke hāʻule ka MER i ka pae paepae, e hāʻule nui ka BER.
Ka manawa hoʻouna: Feb-23-2023