ofdmi kavram olarak anladiktan sonra bunun ocdm , yani orthogonal code division multiplexing ‘in bir alt ornegi oldugunu belirtmek lazim. ocdm de yine ayni mantikla hareket eder, tek farki, degisik frekanslarda sinyaller degil de, daha genele olarak degisik waveformlara sahi sinyalleri ustuste koyup gondermesidir.
Read moreOFDM sinyali nedir?
OFDM (Orthogonal Frequency Division Multiplexing) – Ortogonal Frekans Bölmeli Çoklama, Yayılı Spektrum’dan daha verimli bir teknolojidir. Bir sinyalin, birçok küçük sinyale bölünerek farklı frekanslarda ve eş zamanlı olarak gönderilmesidir. Yüksek aktarım kapasitesine ihtiyaç duyulan durumlarda kullanılır.
Read moreWhy LTE uses OFDMA for DL and SC-FDMA for UL?
This is useful for LTE since it makes possible to exploit frequency dependence scheduling . For instance, it would be possible to exploit the fact that user 1 might have a better radio link quality on some specific bandwidth area of the available bandwidth.
Read moreWhich modulation technique is used in 4G?
LTE uses the popular orthogonal frequency division multiplex (OFDM) modulation scheme. It provides the essential spectral efficiency to achieve high data rates but also permits multiple users to share a common channel.
Read moreWhat is FDMA in LTE?
SC-FDMA is a hybrid modulation scheme that combines the low peak-to-average ratio (PAR) of traditional single-carrier formats such as GSM with the multipath resistance and in-channel frequency scheduling flexibility of orthogonal frequency-division multiplexing (OFDM). Acronyms galore: LTE history and context.
Read moreWhat is OFDMA technology?
OFDMA is the multi-user variant of the OFDM scheme where multiple access is achieved by assigning subsets of time-frequency resources to different users, allowing simultaneous data transmission from several users .
Read moreWhat is OFDM modulation technique?
Orthogonal Frequency Division Multiplexing (OFDM) is another widely used modulation method used to achieve high data rates and spectral efficiency . It is known as a multicarrier modulation method as many carriers are used instead of just one.
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