A Dynamic Frequency Allocation Scheme for IEEE 802.16 OFDMA-Based WMANs Using Hungary Algorithm

In IEEE 802.16 Wireless Metropolitan Area Networks (WMAN) with Orthogonal Frequency Division Multiple Access (OFDMA) physical layer, dynamic subchannel allocation algorithm (DSAA) is essential for a Base Station (BS) to efficiently utilize bandwidth capacity. Conventional DSAAs usually group all subcarriers into a number of subchannels and allocate subchannels to Subscriber Stations (SS), one for each SS, according to its traffic demand and channel quality of the link between BS. However, the restriction of conventional DSAAs allocating N subchannels to N SSs (N≥1) is inflexible and inefficient with respect to spectrum efficiency. In this paper, a new DSAA with Hungary algorithm is proposed to enhance the subchannel capacity (in bits per subcarrier) by permitting more than one subchannel allocated for one SS for which channel quality is much better than others.