N'ime usoro nkwurịta okwu dijitalụ, onye nnata na-enweta nchikota nke mgbaàmà na-ebufe na mkpọtụ ọwa.
Nkeezigbo nnabatanke akara dijitalụ dabere na njiri “kachasị mma” yana enwere ike mperi mperi. Njehie ndị a tụlere n'isiakwụkwọ a bụ ọkachasị n'ihi mkpọtụ Gaussian ọcha nwere oke. N'okpuru echiche a, a na-ekewa akara ngosi dijitalụ ọnụọgụ abụọ na-ekewa n'ime ụdị atọ: mgbama doro anya, mgbama dabere na oge, na mgbama na-agbanwe agbanwe. A na-enyocha opekempe mpe mpe mpe mpe mpe mpe mpe mpe mpe mpe mpe mpe mperi. Tụkwasị na nke ahụ, a na-enyochakwa ohere njehie nke ịnweta akara ngosi baseband multi-level.
Nkeisi ụkpụrụ nke nyochabụ ileba anya n'ụkpụrụ niile egosipụtara nke akara mgbaama anatara dị ka vector na k-dimensional natara ohere vector wee kewaa oghere vector anatara na mpaghara abụọ. A na-ekpebi ma njehie emee ma ọ bụ na ọ gaghị eme dabere na mpaghara vector natara na-adaba. Enwere ike nweta eserese ngọngọ ụkpụrụ nke onye nnata kacha mma yana enwere ike gbakọọ ọnụego njehie bit site na njirisi mkpebi. Ọnụego mperi mperi a kacha mma n'echiche - ya bụ, usoro usoro kacha nta enwere ike.
Nkeezigbo mperi mperiA na-ekpebi ọnụọgụ ọnụọgụ ọnụọgụ abụọ site na ọnụọgụ njikọ p nke akara abụọ na akara ngosi na mkpọtụ E/n, mana enweghị mmekọrịta chiri anya na ụdị mgbama. Obere ọnụọgụ njikọ p, na-ebelata ọnụego mperi mperi. Ọnụọgụ njikọ nke akara 2PSK bụ nke kacha nta (p = -1), na ọnụọgụ mperi ya bụ nke kacha ala. Enwere ike were akara ngosi 2FSK dị ka mgbama quadrature yana ọnụọgụ njikọ ya bụ p = 0.
Makamgbama na-eso ogena mgbama na-agbanwe agbanwe, naanị nkeFSK mgbamaA na-eji ya dị ka onye nnọchiteanya maka nyocha, n'ihi na na ọwa a, njupụta na oge nke mgbaàmà na-agbanwe na-enweghị usoro n'ihi mmetụta nke mkpọtụ, ya mere mgbaàmà FSK na-adabara maka ngwa ahụ. Ebe ọwa ahụ na-ebute mgbanwe na-enweghị usoro n'usoro mgbama, enweghị ike iji mkpọmkpọ ọnụ. Kama, demodulation na-abụghị nke jikọrọ ọnụ bụ ụzọ kacha mma iji nweta akara ngosi.
Tụnyere ọnụego njehie bit nke ezigbo nnata na nkeezigbo nnata, a pụrụ ịhụ na ọ bụrụ na mgbaàmà-na-mkpọtụ ike ruru r na n'ezie nnata bụ hà nhata nke akara ike njupụta ike spectral density na ezigbo nnata E/n, bit njehie ọnụego arụmọrụ nke abụọ bụ otu. Agbanyeghị, nke a anaghị ekwe omume mgbe niile n'ihi ndị nnata n'ezie. Yabụ, arụmọrụ onye nnata n'ezie na-aka njọ mgbe niile karịa nke nnata kacha mma.
Nke a bụ ihe Shenzhen HDV Phoelectron Technology Co., Ltd. nye gị. na-ewetara gị maka “Kachasị mma nnabata nke akara dijitalụ”. Enwere m olileanya na isiokwu a nwere ike inyere gị aka ịbawanye ihe ọmụma gị. E wezụga nke a isiokwu ma ọ bụrụ na ị na-achọ ezigbo ngwa anya eriri nkwurịta okwu akụrụngwa emeputa ụlọ ọrụ ị nwere ike tụleegbasara anyị.
Shenzhen HDV Photoelectric Technology Co., Ltd.bụ onye na-emepụta ngwaahịa nkwukọrịta. Ka ọ dị ugbu a, akụrụngwa a na-emepụta na-ekpuchiUsoro ONU, ngwa anya modul usoro, Usoro OLT, nausoro transceiver. Anyị nwere ike ịnye ọrụ ahaziri maka ọnọdụ dị iche iche. A na-anabata gịndụmọdụ.
