Qhov tseem ceeb, ib qho block-based linear modulation , xws li kev faib ntau zaus ntau zaus (GFDM GFDM Tsis yog-orthogonal zaus-division multiplexing (N-OFDM) yog Ib txoj hauv kev ntawm kev nkag siab cov ntaub ntawv digital ntawm ntau lub xov tooj sib txuas nrog tsis yog orthogonal ntu nruab nrab ntawm cov zaus ntawm sub-carriers N-OFDM cov teeb liab tuaj yeem siv rau hauv kev sib txuas lus thiab radar systems. https://en.wikipedia.org › wiki › Non-orthogonal_frequency-d…
Non-orthogonal zaus-division multiplexing - Wikipedia
), tuaj yeem pom raws li precoded-OFDM, qhov twg cov ntaub ntawv precoded tshwm sim los ntawm kev hloov pauv zaus. …
DFT precoded OFDM yog dab tsi?
Los ntawm cov lej simulation, cov tswv yim hloov kho tau pom los txo qhov siab tshaj-rau-nruab nrab lub zog piv ntawm cov teeb liab OFDM xa mus txog 2 dB ntawm 10 -3 clipping tus nqi. …
DFT precoding yog dab tsi?
Nyob rau hauv daim ntawv no, Discrete Fourier Transform (DFT) precoding txheej txheem yog ua hauj lwm rau µ-raws li OFDM system kom txo tau ntxiv PAPR los ntawm kev hloov ib tug multicarrier OFDM rau hauv ib zaug. -Cov khoom siv OFDM system. Ntxiv mus, nws tsis tsuas yog txo cov PAPR xwb tab sis kuj txo qis qhov system complexity vim nws yog cov txheej txheem linear.
OFDM yog dab tsi thiab nws ua haujlwm li cas?
OFDM yog ib daim ntawv ntawm kev hloov pauv ntau yamIb qho OFDM teeb liab muaj ntau qhov sib txuas sib txuas sib txuas. … Vim li ntawd thaum cov teeb liab raug xa mus nyob ze ib leeg lawv yuav tsum tau sib nrug kom lub receiver tuaj yeem cais lawv siv lub lim thiab yuav tsum muaj ib pab pawg neeg zov nruab nrab ntawm lawv.
OFDM subcarrier yog dab tsi?
Ob leeg OFDM thiab OFDMA tau faib cov channel rau hauv subcarriers los ntawm kev ua lej hu ua rov qab nrawm Fourier hloov (IFFT). Qhov sib nrug ntawm cov subcarriers yog orthogonal, yog li lawv yuav tsis cuam tshuam nrog ib leeg txawm tias tsis muaj kev tiv thaiv ntawm lawv.… Txhua OFDM subcarrier yog 312.5 KHz.
