ABSTRACT
Compared to time division multiple access (TDMA) and CDMA technologies, Orthogonal frequency division multiple access (OFDMA) divides the wireless resource into nonoverlapping frequency-time chunks and offers more flexibility for resource allocation. It has many advantages such as robustness against intersymbol interference and multipath fading as well as lower complexity of receiver equalization. Owing to these, OFDMA has been adopted as the core technology for most recent broadband wireless data systems, such as IEEE 802.16 (WiMAX), IEEE 802.11a/g (Wireless LANs), and LTE for 3GPP.
