Sum-Rate Capacity of Random Beamforming for Multi-Antenna Broadcast Channels with Other Cell Interference

作者：Moon Sung Hyun^*; Lee Sang Rim; Lee Inkyu

来源：IEEE Transactions on Wireless Communications, 2011, 10(8): 2440-2444.

DOI：10.1109/TWC.2011.070711.102145

• MIMO broadcast channel
• random beamforming
• multiuser scheduling
• other-cell interference

In this letter, we analyze the sum rate of random beamforming (RBF) for downlink multi-antenna systems in the presence of other cell interference (OCI). Employing extreme value theory, an expression of the asymptotic ergodic sum rate with a large number of users is derived from the limiting distribution of the sample maximum of the received signal-to-interference-plus-noise ratio. Based on our result, the scaling law of multiuser diversity gain is also exhibited in the context of RBF systems with the OCI, which is shown to coincide with the previous result without the other cell interferers. Simulation results verify the validity of our analysis even with not so large number of users.

• 出版日期2011-8