We propose a successive relaying decode-and-forward protocol for the half-duplex 2-relay 2-destination multicarrier channel. The proposed protocol performs significantly better than existing protocols and achieves sum rates close to the cutset upper bound. We also prove that the linear program that describes the cutset upper bound for sum capacity is optimized using only 3 of the 4 possible states of the half-duplex network. Of these 3 states, successive relaying uses the two states in which one of the relays is receiving from the source while the other relay is transmitting to the destinations. In simulations under a Rayleigh fading model, the gap between the cutset upper bound and the proposed protocol is observed to be bounded.

中文翻译：

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两跳两目的地多载波中继信道的连续中继

我们提出了一种用于半双工 2 中继 2 目的地多载波信道的连续中继解码转发协议。所提出的协议的性能明显优于现有协议，并实现了接近割集上限的总和率。我们还证明，描述总容量割集上限的线性程序仅使用半双工网络的 4 种可能状态中的 3 种进行了优化。在这 3 种状态中，连续中继使用两种状态，其中一个中继正在从源接收，而另一个中继正在向目的地传输。在瑞利衰落模型下的模拟中，可以观察到割集上限和提议的协议之间的差距是有界的。