Multiuser power and bandwidth allocation in ad hoc networks with Type-I HARQ under Rician channel with statistical CSI

In this paper, we address the problem of joint power and bandwidth allocation for Type-I hybrid automatic repeat request in military ad hoc networks based on orthogonal frequency division multiple access when only statistical channel state information is available to perform the resource allocation (RA) and when considering practical modulation and coding schemes. The novelty of our work lies in the consideration of the Rician fast fading channel during the RA process, which is a general fading model which can represent the Rayleigh fading channel and the additive white Gaussian noise channel as special cases. The objective of this paper is to propose an algorithm to minimize the sum of the transmit power of each user under a constraint on the minimum useful data rate, and a constraint on the maximum transmit power. An accurate approximation of the coded packet error rate over the Rician fading channel is first proposed, and an efficient algorithm to solve the problem is developed. The effectiveness of the algorithm is demonstrated though simulations. Our results point out a significant energy saving when the Rician distribution is explicitly taken into account when performing the RA instead of considering the Rayleigh channel.