Category: 5G
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A casual guide to the OFDM transmitter — no heavy math, plenty of springs and echoes. Watch how Wi-Fi, 4G and 5G build their signals, slice by slice.
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Your phone needs to check CSI-RS signal regularly to keep track of the channel conditions. Just like a train schedule tells you exactly when your train arrives, a smart timing offset tells your phone when to check the CSI-RS signal. Let us explore that concept a bit.
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Your phone locates PDCCH in the vast ocean of Time and Frequency using Search Space and CORESET. Welcome to the world of treasure hunt.
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Uplink Power Control adjusts your phone’s transmit power so that the base station receives signals at just the right strength. Think of it like adjusting your voice in a conversation—if you’re close, you speak softly; if you’re far away or in a noisy room, you speak louder. Let’s try to understand this concept in a…
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Link adaptation is how a 4G or 5G tower resizes each data packet to fit your signal: the phone reports a CQI, the tower picks an MCS. With delivery trucks.
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RACH (Random Access Channel) is the four-message handshake your phone uses to get a 5G tower’s attention and get online. Explained with a party analogy.