Journal article

On Monotonicity of the Optimal Transmission Policy in Cross-Layer Adaptive m-QAM Modulation

N Ding, P Sadeghi, RA Kennedy

IEEE Transactions on Communications | Institute of Electrical and Electronics Engineers (IEEE) | Published : 2016


This paper considers a cross-layer adaptive modulation system that is modeled as a Markov decision process. We study how to utilize the monotonicity of the optimal transmission policy to relieve the computational complexity of dynamic programming (DP). In this system, a scheduler controls the bit rate of the m-quadrature amplitude modulation in order to minimize the long-term losses incurred by the queue overflow in the data link layer and the transmission power consumption in the physical layer. The work is done in two steps. First, we observe the L-convexity and submodularity of DP to prove that the optimal policy is always nondecreasing in queue occupancy/state and derive the sufficient c..

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