Cross-layer optimization performance evaluation of OFDM broadband network on millimeter wave channels

The need of bandwidth in high speed data and multimedia services of Broadband Wireless System means the need of occupying higher frequency band. LMDS is an example of broadband access system operated in EHF millimeter band (e.g. 30 GHz). In millimeter band, the capacity of wireless network will have two major constrains: the impact of millimeter wave channels in physical layer and the channel access method in MAC layer. Improvement in physical layer is usually carried-out by adaptive modulation considering channel state information (CSI). In MAC layer, many adaptive scheduling have also been developed. Combining these two approaches result in many algorithms called cross layer optimization in wireless network. This paper present our first step of evaluation of cross layer optimization performance of orthogonal frequency division multiplexing (OFDM) network applied in millimeter wave channels in tropical region. Based on measurement and related channels data in Surabaya Indonesia, we found that 'rain attenuation', could reach the level 70 dB in the long period of time. Simulation shows the impact of the severity of 'rain channel', i.e. degrade overall throughput or decreases the feasible rate of system. To compensate the degradation by channels and to provide maximum capacity, considering fairness among users, an evaluation of resource allocation via simulation of cross-layer optimization of OFDM Wireless Network in tropical region on millimeter wave channels is being carried out.