A Novel Transmission Scheme for the $K$ -User Broadcast Channel With Delayed CSIT

Chao He (1) , Sheng Yang (1) , Pablo Piantanida (1)

1 L2S - Laboratoire des signaux et systèmes

The state-dependent K-user memoryless broadcast channel (BC) with state feedback is investigated. We propose a novel transmission scheme and derive its corresponding achievable rate region, which, compared with some general schemes that deal with feedback, has the advantage of being relatively simple and thus is easy to evaluate. In particular, we show that the proposed scheme achieves the capacity region of the symmetric erasure BC with an arbitrary input alphabet size. For the fading Gaussian BC, numerical results show that the proposed scheme outperforms existing schemes in terms of symmetric rate. Our analysis also proves its optimality at high signal-to-noise ratio, in terms of degrees of freedom

Keywords: Index Terms Broadcast channel; Erasure channel; Fading Gaussian channel; State feedback

Domains: Computer Science [cs]; Information Theory [cs.IT]; Computer Science [cs]; Networking and Internet Architecture [cs.NI]; Mathematics [math]; Information Theory [math.IT]; Mathematics [math]; Statistics [math.ST]

Chao He, Sheng Yang, Pablo Piantanida. A Novel Transmission Scheme for the $K$ -User Broadcast Channel With Delayed CSIT. IEEE Transactions on Wireless Communications, 2018, 17 (1), pp.386 - 399. ⟨10.1109/TWC.2017.2767042⟩. ⟨hal-01742325⟩