First manufactured by Array Comm and later on adopted as the High Capacity “ Spatial Division Multiple Access (HC -SDMA) radio interface standard (ATIS-0700004-2005) by the Alliance of Telecommunications Industry Solutions (ATIS, this wireless broadband technology favours the utilization of its bandwidth with the help of smart antennas. This mobile broadband wireless access system also called the HC-SDMA or High Capacity Spatial Division Multiple Access, has the HC-SDMA interface that offer wide-area broadband wireless data-connectivity for fixed, portable and mobile computing devices and appliances. Designed and implemented with smart antenna array techniques to substantially improve the radio frequency (RF) coverage, capacity and performance for the system, the protocol has the following features
it describes base station and client device RF characteristics, including output power levels, transmit frequencies and timing error, pulse shaping, in-band and out-of band spurious emissions, receiver sensitivity and selectivity