Spectral efficient protocols for half-duplex fading relay channels
Spectral efficient protocols for half-duplex fading relay channels
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DOI：
10.1109/jsac.2007.070213
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发表时间：
2007-02-01
影响因子：
16.4
通讯作者：
Wittneben, Armin
中科院分区：
文献类型：
--
作者：
Rankov, Boris;Wittneben, Armin
我们研究了两跳通信协议，其中一个或多个中继终端协助两个或多个终端之间的通信。所有终端都工作在半双工模式，因此从源终端到目的终端的一个信息符号的传输占用两个信道使用。这导致频谱效率的损失，这是由于相应容量表达式中的预对数因子的一半。我们提出了两种新的半双工转发协议，避免了前日志因子的一半。首先，我们考虑一种中继协议，其中两个终端之间的双向连接通过一个放大转发(AF)或解码转发(DF)中继(双向中继)来建立。我们还将该协议扩展到多用户场景，其中多个终端通过多个正交化转发(OF)中继端与多个伙伴终端通信，即中继端通过分布式逼零算法对不同的双向传输进行正交化。其次，我们提出了一种中继协议，其中两个中继器，无论是AF还是DF，交替地将消息从源终端转发到目的终端(双路径中继)。结果表明，这两种协议都恢复了很大一部分半双工丢失。
We study two-hop communication protocols where one or several relay terminals assist in the communication between two or more terminals. All terminals operate in half-duplex mode, hence the transmission of one information symbol from the source terminal to the destination terminal occupies two channel uses. This leads to a loss in spectral efficiency due to the pre-log factor one-half in corresponding capacity expressions. We propose two new half-duplex relaying protocols that avoid the pre-log factor one-half. Firstly, we consider a relaying protocol where a bidirectional connection between two terminals is established via one amplify-and-forward (AF) or decode-and-forward (DF) relay (two-way relaying). We also extend this protocol to a multi-user scenario, where multiple terminals communicate with multiple partner terminals via several orthogonalize-and-forward (OF) relay terminals, i.e., the relays orthogonalize the different two-way transmissions by a distributed zero-forcing algorithm. Secondly, we propose a relaying protocol where two relays, either AF or DF, alternately forward messages from a source terminal to a destination terminal (two-path relaying). It is shown that both protocols recover a significant portion of the half-duplex loss.