# IVC 5G O-RAN Summary ###### tags: `UNILA` ## Summary 5 Baseband Technology-OFDMA Nama : Hans Khalif Hafif Student ID : 1915031078 Team : A-3 • Radio-frequency (RF) engineering is a subset of eleOFDMA is essentially a type of OFDM for multiple users. It allocates in both the time domain and the frequency domain, allowing for multiple users—even those with widely varying use patterns or data loads. By comparison, OFDM can allocate only sequentially. Previous Wi-Fi standards were intended for web browsing and email in low-density situations. Today's users aren't just greater in number; they're performing more data-intensive functions in more settings than ever before. Network congestion caused by simultaneous requests causes slowdowns, since clients must form a queue to complete transmissions. OFDMA solves the congestion problem by accommodating multiple users at the same time and allocating bandwidth more efficiently. One way to understand OFDMA is to use delivery trucks as an analogy. With Wi-Fi 5, each "truck" could carry only a single user's cargo. But with Wi-Fi 6 and OFDMA, the truck can be loaded with multiple users' cargo loads. Also, its drop-off schedule can be optimized for speed and efficiency. OFDMA divides a Wi-Fi channel into smaller frequency allocations, called resource units (RUs). An access point can communicate with multiple clients by assigning them to specific RUs. Wi-Fi 5 divides channels into 64 312.5-kHz subcarriers, all of which are used to transmit data to a single client. By spacing these carriers orthogonally, OFDMA allows Wi-Fi 6 to divide channels into smaller units without interference. The number of RUs assigned to each client is determined by factors such as device constraints, quality-of-service (QoS) requirements, and packet size. The flexibility in scheduling along with the parallel nature of OFDMA increases the productive Air Time efficiency.