Ieee Transactions on Communications, Accepted for Publication Detect-and-forward Relaying Aided Cooperative Spatial Modulation for Wireless Networks
Ieee Transactions on Communications, Accepted for Publication Detect-and-forward Relaying Aided Cooperative Spatial Modulation for Wireless Networks
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通讯作者：
Ping Yang;Bo Zhang;Yue Xiao;Binhong Dong;Shaoqian Li;M. El-Hajjar;L. Hanzo;D. I. P. Kim;Y. Ya
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作者：
Ping Yang;Bo Zhang;Yue Xiao;Binhong Dong;Shaoqian Li;M. El-Hajjar;L. Hanzo;D. I. P. Kim;Y. Ya
- 提出了一种新的检测转发（DeF）中继辅助协作SM方案，该方案能够在可实现的误码率（BER）、复杂度和不等差错保护（UEP）方面取得灵活的折衷。更具体地，SM在源节点（SN）处被调用，并且信息比特流被分成两个不同的集合：天线索引比特（AI比特）以及幅度和相位调制比特（APM比特）。通过利用AI比特和APM比特在SM检测中的不同重要性，我们提出了三种低复杂度，但功能强大的中继协议，即部分，混合和分层调制（HM）的DeF中继方案。这些方案通过仔细考虑它们的潜在益处并且然后分配用于中继消息的特定调制方案来确定要重新调制的最适当的比特数。作为进一步的益处，可以避免多个射频（RF）链的采用和紧密中继间同步（IRS）的要求。此外，通过利用我们的低复杂度的中继协议和我们的元件间干扰（IEI）模型的好处，低复杂度的最大似然（ML）检测器，提出了联合检测通过源-目的地（SD）和中继-目的地（RD）链路接收到的信号。此外，我们的DeF-SM方案的BER的上限推导。我们的数值结果表明，该界是渐近紧在高信噪比区域和所提出的计划提供有益的系统性能的改善相比，传统的MIMO方案在一个相同的合作场景。
—A novel detect-and-forward (DeF) relaying aided cooperative SM scheme is proposed, which is capable of striking a flexible tradeoff in terms of the achievable bit error ratio (BER), complexity and unequal error protection (UEP). More specifically, SM is invoked at the source node (SN) and the information bit stream is divided into two different sets: the antenna index-bits (AI-bits) as well as the amplitude and phase modulation-bits (APM-bits). By exploiting the different importance of the AI-bits and the APM-bits in SM detection, we propose three low-complexity, yet powerful relay protocols, namely the partial, the hybrid and the hierarchical modulation (HM) based DeF relaying schemes. These schemes determine the most appropriate number of bits to be re-modulated by carefully considering their potential benefits and then assigning a specific modulation scheme for relaying the message. As a further benefit, the employment of multiple radio frequency (RF) chains and the requirement of tight inter-relay synchronization (IRS) can be avoided. Moreover, by exploiting the benefits of our low-complexity relaying protocols and our inter-element interference (IEI) model, a low-complexity maximum-likelihood (ML) detector is proposed for jointly detecting the signal received both via the source-destination (SD) and relay-destination (RD) links. Additionally, an upper bound of the BER is derived for our DeF-SM scheme. Our numerical results show that the bound is asymptotically tight in the high-SNR region and the proposed schemes provide beneficial system performance improvements compared to the conventional MIMO schemes in an identical cooperative scenario.