摘要
采用空间分集的方法可以有效地对抗无线信道中的衰落.由于受到体积、重量、成本等因素的限制,在无线通信系统的用户终端上实现多天线技术较为困难.而在单天线的无线用户间通过协作,共享天线,可以实现虚拟的多天线.低密度奇偶校验(LDPC)编码是一种性能优良的线性分组码,利用其码字内码元间固有的相关性,通过不同的用户发送码字的不同部分,可以实现虚拟的多发送天线,获得发送分集增益,在不增加系统带宽和发射功率、系统复杂度也不会明显增加的情况下能显著地提高系统性能.
Spatial diversity is an effective method to resist fading effect in wireless channel. Due to the limitation of size, weight and cost,it is difficult to use the multi-antenna technique on the terminal of wireless communication.Cooperative communication allows the mobile terminals with a single-antenna to share their antennas. Thus virtual multi-antenna can be created to realize transmitting diversity. LDPC code is a good linear block code.Because of the intrinsic coherence among the bits of the code word, we can create virtual multi-antenna and obtain diversity gain by making different users transmit different parts of the code word. Once diversity gain is obtained, the system performance can be improved effectively, without much rise in the system bandwidth and transmitting power, nor would the cost and complexity of the system increase evidently.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2007年第4期712-715,共4页
Acta Electronica Sinica
基金
重庆市自然科学基金(No.CSTC2006BB2363)
教育部留学回国人员科研启动基金(No.[2005]383)
重庆市留学回国人员科技活动择优资助项目
关键词
衰落
协作通信
分集
多天线
LDPC编码
编码协作
fading
cooperative communication
diversity
multi-antenna
low-density parity-check code（LDPCC）
coded cooperation
