Which of the following statements is true about OFDMA?

OFDMA stands for Orthogonal Frequency Division Multiple Access. This technology is crucial for enhancing wireless communication efficiency by allowing multiple users to share the same communication channel simultaneously without causing interference. Each user can occupy a subset of subcarriers within the wider channel, which optimizes the available spectrum and improves overall throughput.

This technology is a key feature introduced in Wi-Fi 6 (802.11ax) and it enhances the capacity and efficiency of wireless networks, especially in environments with a large number of connected devices. The ability for multiple users to transmit at the same time without waiting for their turn, as is the case with traditional transmission methods, makes OFDMA a significant advancement in Wi-Fi technology.

In contrast, the other statements provide incorrect information about OFDMA, such as restrictions on frequency bands or claiming it reduces network efficiency, which runs counter to its intended purpose of improving efficiency and capacity in wireless networks.