Imperfect CSI Based Joint Bit Loading and Power Allocation for Deadline Constrained Transmission

This paper studies the imperfect channel state information (CSI) based joint resource scheduling problem for deadline constrained transmission. We present a holistic system model in terms of performance constraints of imperfect CSI, scheduling deadline and bit loading. By tackling channel estimation error, robust scheduling problems are formulated with the ellipsoidal approximation and transmission reliability constraints respectively. Dynamic programming (DP) based robust scheduling schemes are derived. The numerical results show that the proposed robust scheduling schemes are efficient in solving the jointly scheduling problem. It is also shown that the impact of imperfect CSI is non-negligible, thus highlighting the importance of robust design in time-sensitive communications.