Capacity simulation of cdma2000 1×EV-DO forward link with opportunistic beam forming

This paper addresses possible capacity gains in a cdma2000 1xEV-DO system that utilizes the Opportunistic Beam Forming (OBF) scheme. Contrary to the voice-oriented cdma2000 systems, where it is desirable to maintain a fixed signal-to-interference-and-noise ratio (SINR) level at the access terminal (AT), the 1xEV-DO system is designed to take advantage of the natural SINR fluctuations in a wireless channel. The resulting gain in capacity is called the “multi-user diversity gain.” In certain channel conditions, the rate of the natural SINR fluctuations may not be high enough, resulting in low multi-user diversity gain. In such a case, SINR fluctuations may be induced artificially by the OBF scheme in order to increase capacity.