Cooperative Network Communications in Dynamic Channel Environments
Coded space-time cooperation is a powerful approach to deliver information over a distributed network.Multiple transmit and receive nodes form a distributed multiple-input-multiple-output (MIMO) system, thus provide the capability of high data rate transmission with the support of high diversity gains. However, unlike co-located MIMO systems, it is impractical for distributed MIMO networks to maintain a perfect synchronization between different transmit terminals. It has been shown that, in the presence of synchronization error between different relaying nodes of even a fractional symbol, coded cooperation using space-time block codes may experience severe intersymbol interference (ISI) and, subsequently, significant performance degradation. It becomes even more challenging when Doppler effect exists as the result of moving transmit and/or receive nodes. In this paper, we propose the use of BLAST-type of data transmission combined with effective channel coding. The relative independence between the information transmitted from different nodes allows individualized compensation of the time delay and Doppler shift, whereas the channel coding of the information across different transmit nodes assures high spatial diversity. As the result, the proposed scheme is capable in maintaining a high data rate in a dynamical channel environment. It provides robust and reliable communication quality by taking advantages of spatial information multiplexing and spatial diversity.
Yimin Zhang KehuYang Moeness G.Amin
Wireless Communications and Positioning Laboratory Center for Advanced Communications Villanova Univ Electronic Engineering Research Institute Xidian University, Xian, Shaanxi 710071, China
国际会议
2006 IEEE International Conference on Information Acquisition
山东威海
英文
133-138
2006-08-20（万方平台首次上网日期，不代表论文的发表时间）