EVM: chidimbu cheError Vector Magnitude, zvinoreva kukanganisa vector amplitude.
Iyo yedhijitari chiratidzo frequency bhendi yekufambisa ndeyekumoderesa baseband siginecha pakupera kwekutumira, kuitumira kumutsara wekutapurirana, uye wobva waidzora kumagumo ekugamuchira kudzoreredza yekutanga baseband chiratidzo. Mukuita uku, kukanganisa kwemodulation kunogadzirwa nemodulator, mhando yeRF zvishandiso, phase-yakiyiwa loop (PLL) ruzha, PA kukanganisa maitiro, ruzha rwekupisa, uye modulator dhizaini zvese zvinogadzira kukanganisa mavheji (EVM). Iyo EVM ichave nekukanganisa kukuru pamhando yeakagadziridzwa masaini, saka modulation yemhando yekuyedza purojekiti ndechimwe chezvinhu zvakakosha zvekuyedzwa kweRF.
EVM inonyatso inoreva kuswedera pakati peIQ chikamu chinogadzirwa kana iyo transmitter ichidhiza chiratidzo uye yakakodzera chiratidzo chikamu. Icho chiratidzo chehutano hwechiratidzo chemodulated. Kazhinji yenguva, iyo yekukanganisa vector ine chekuita neM-ary I/Q modulation schemes seQPSK, uye inowanzo ratidzwa neI/Q “nyeredzi” dhiyagiramu yezviratidzo zvedemodulation.
Iko kukanganisa vector amplitude [EVM] inotsanangurwa sereshiyo yemudzi inoreva square value yeavhareji simba remhosho yevheta chiratidzo kumudzi unoreva sikweya kukosha kweavhareji simba rechiratidzo chakakodzera uye inoratidzwa sechikamu. Iyo diki iyo EVM, zviri nani iyo chiratidzo chemhando.
Iko kukanganisa vector amplitude ndiko kutsauka pakati peyakayerwa waveform uye theoretically modulated waveform. Ose mawaveforms ane bandwidth ye1.28 MHz uye roll-off coefficient ye0.22. Iwo maviri waveforms anowedzeredzwa nekusarudza frequency, mhedziso chikamu, absolute amplitude, uye chip wachi nguva yekudzikisa kukanganisa vector. Iyo yekuyera nguva ndeye-imwe-nguva slot. Iyo shoma yekukanganisa vector amplitude haifanire kunge yakakura kupfuura 17.5%.
Chinangwa cheyedzo ndechekuona kana waveform yakagadzirwa neinotapurirana iri yechokwadi zvakakwana kuti mugamuchiri awane kuita kwekugamuchira kwakatsanangurwa.
Ichi chisumo cheEVM kubva kuShenzhen HDV Optoelectronic Technology Co., Ltd., kambani yekutaurirana yemaziso inogadzira zvigadzirwa zvekutaurirana. Welcome toconsult