Block Markov superposition transmission over turbulence channels in outdoor optical wireless communication

Abstract

Based on the equivalent genie-aided system,the bit-error rate of the block Markov superposition transmission system was analyzed and the union bound of the bit-error rate of the genie-aided system was derived.When the bit-error rate was extremely low at which the Monte Carlo simulation was time-consuming,the union bound could be adopted to evaluate the performance of the block Markov superposition transmission system.Simulations under turbulence conditions from weak to strong are performed which show that,in the low bit-error rate region,performance of the block Markov superposition transmission system matches well with the lower bound.It is also illustrated that the derived union bound matches well with Monte Carlo simulation result.At the BER of 10-5,block Markov superposition transmission system with transmission memory 2 performs within 1 dB away from the Shannon limit.

Keywords

• optical wireless communication
• turbulence effect
• block Markov superposition transmission
• union bound
• Gamma-Gamma channel model