Closed-Form Capacity Expression for Low Complexity BICM with Uniform Inputs

Abstract

In this paper, we derive closed-form capacity expressions for a low complexity bit-interleaved coded modulation system with uniform inputs in a Rayleigh fading channel with additive white Gaussian noise. Additionally, we include pilot-symbol assisted channel estimation in our considerations. Finding a closed-form solution is enabled by assuming quantization and that the decoder has no channel state information. The effects of these assumptions on the capacity are investigated separately. To verify our closed-form expressions and to show the applicability of our system model to real world physical channels, we perform measurements using the Vienna Wireless Testbed.