| 摘要: |
| 提出了一种采用网络-信道编码的解调前传(DmF)协作通信方案。与译码前传（DF）相比，
DmF协作方式在中继处只对信号进行解调而非译码，因此，大大降低了中继节点的复
杂度。在由两个用户、一个中继节点和一个基站组成的通信模型中，采用LDPC信道编码
与网络编码结合的方式，构造了一种DmF协作传输方式。在基站处，通过构造的〖WTHX〗H〖
WTBZ〗矩阵对
来自两用户及中继的信号进行联合译码。仿真结果表明：所给方案的性能优于非协作方
式及无网络编码的协作通信方式，随着信噪比的增加这种优势会更加明显；另外，DmF的性
能与DF的非常接近，但其设备复杂度却大大降低，因此DmF比DF方式更具实用性。
同时，该方案在降低设备复杂度、减少延迟、有效对抗无线信道慢衰落、提高通信性能及频
谱利用率等方面都是非常有效的。 |
| 关键词: 协作通信 网络-信道编码 解调前传 译码前传 LDPC码 |
| DOI： |
|
| 基金项目:东南大学移动通信国家重点实验室开放研究基金资助课题（W200
818）；电子科技大学校青年基金资助项目 |
|
| DmF Cooperative Communication with Joint Network-Channel Coding |
| LI Gu,SHI Zhi-ping,HU Zi-jia |
| (National Key Lab of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China;National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China) |
| Abstract: |
| A strategy of DemodulateandForward (DmF) cooperation based on joint networ
kchannel coding in wireless communication is proposed. For DmF, the relay
only performs demodulation instead of decoding, so there is lower complexity th
an DecodeandForward (DF). With the combination of network coding and the LDP
C
channel coding, DmF cooperative communication which comprises two users, a base
station and a relay node in the cooperative uplink performs better. At the base
station,a matrix [WTHX]H[WTBZ] is designed, which is used for decoding signals
from two
users and the relay jointly. Simulation results show that the proposed strategy
outper
forms that of the communication without cooperation and that of the cooperative
communication without network coding. What is more, this advantage becomes more
obvious as the signaltonoise ratio(SNR) becomes larger,and the performa
nce of DmF is
almost close to that of DF with lower complexity, so DmF is more practical than
DF. The proposed scheme is effective for reducing the complexity of equipment
and delay, combating fading, improving communication performance, increasing spe
ctrum efficiency in wireless communication systems. |
| Key words: cooperative communication network channel coding DmF DF LDPC code |
《电讯技术》编辑部 