Nzira dzakakosha dzebhinari yedhijitari modulation ndeiyi: binary amplitude keying (2ASK) - shanduko yeamplitude yechiratidzo chekutakura; Binary frequency shift keying (2FSK) - iyo frequency shanduko yechiratidzo chekutakura; Binary phase shift keying (2PSK) - Chikamu chekuchinja kwechiratidzo chekutakura. Nekuda kwekusava nechokwadi kwechikamu mu2PSK system, musiyano wechikamu-shift keying 2DPSK inogadzirwa.
Iyo bandwidth inodiwa ne2ASK uye 2PSK yakapetwa kaviri chiyero chekodhi. 2FSK inoda bandwidth yepamusoro kupfuura zvese 2ASK uye 2PSK.
Iyo bit kukanganisa mwero weakasiyana madhijitari modulation masisitimu anoenderana nechiratidzo kune ruzha ratio (SNR) yedemodulator. Panyaya ye-anti-additive white Gaussian noise, yakabatana 2PSK ine basa rakanakisisa, rinoteverwa ne2FSK, uye 2ASK ine basa rakaipisisa.
ASK ndiyo imwe yenzira dzekutanga dzekutanga modulation. Zvakanakira midziyo iri nyore uye yakakwirira frequency band kushandiswa; Izvo zvakashata ndezvekuti iyo anti-ruzha kuita haina kunaka, uye inonzwa kune shanduko yemaitiro echiteshi.tics, uye hazvisi nyore kuita kuti sarudzo yemucherechedzo ishande mune yakanakisa sarudzo pachikumbaridzo mamiriro.
FSK inzira yakakosha yekumisikidza mukukurukurirana kwedhijitari. Kubatsira kwayo ndeyekuti ine simba rinopesana nekupindira uye haina kukanganiswa nechannel parameter shanduko, saka FSK inonyanya kukodzera kudzima nzira. Izvo zvakashata ndezvekuti iyo yakagarwa frequency bhendi yakafara, kunyanya MF-SK, uye frequency bhendi kushandiswa kwakadzikira. Parizvino, frequency modulation system inonyanya kushandiswa mune yepakati uye yakaderera yekumhanyisa data data.
PSK kana DPSK imodulation modulation ine yakanyanya kutapurirana, kugona kwayo kunopesana neruzha kune simba kupfuura ASK neFSK, uye haisi nyore kukanganiswa nekushandurwa kwemaitiro echiteshi, saka yakashandiswa zvakanyanya mukumhanyisa uye yepakati yekumhanyisa data data. . Absolute phase shift (PSK) ine dambudziko remutakuri wechikamu kusanzwisisika mukuwirirana demodulation, saka haiwanzo shandiswa mukutapurirana kwakananga mukuita. MDPSK inonyanya kushandiswa.
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