Chapter 4: Achievable Rate Analysis

Learning Objectives

• Derive the use-and-then-forget (UatF) bound and explain why channel hardening makes it tight
• Compute closed-form achievable rate expressions for MRC, ZF, and MMSE combining
• Analyze sum-rate scaling laws and understand how they depend on the combining scheme
• Determine power scaling regimes in which transmit power can be reduced with no rate loss
• Compare the interference-limited and noise-limited regimes of massive MIMO