一种部分信道响应环境中的多用户MIMO-OFDM自适应子载波分配优化算法
doi: 10.3724/SP.J.1146.2006.02030
An Optimal Adaptive Subcarrier Allocation for Multiuser MIMO-OFDM Transmission in Partial-channel Response Environment
-
摘要: 该文提出一种在部分信道响应环境中利用各个用户的信道反馈信息自适应调整多用户子载波分配的优化算法，该算法考虑到实际环境中反馈信息延迟和误差引起的部分信道响应情况，结合各用户的反馈信道信息和动态子载波组分配技术，可实现有效降低自适应子载波分配运算量同时又不明显弱化系统性能的目的。仿真结果表明，该算法可改善部分信道响应带来的负面影响，同时也使子载波分配算法获得较大的简化。Abstract: In this paper, an optimal adaptive multiuser subcarrier allocation with partial-channel response is proposed. This algorithm reduces computational complexity without apparent performance attenuation based on multiusers feedback information and dynamic subcarrier allocation method by considering partial-channel response caused by delayed feedback information or estimate error. Simulation results show that the proposed method decreases the impact of partial-channel response and computational complexity obviously with gaining an approximative performance compared with traditional subcarrier allocation method at the same time.
-
Tarokh V, Seshadri N, and Calderbank A R. Space-timecodes for high data rate wireless communication:Performance criterion and code construction[J].IEEE Trans.on Information Theory.1998, 44(2):744-765[2]Yang H W. A road to future broadband wireless access:MIMO-OFDM-based air interface[J]. IEEE CommunicationsMagazine, 2005, 43(1): 53-60.[3]Goldsmith A J and Chua S. Adaptive coded modulation forfading channels[J].IEEE Transaction on Communications.1998, 46(5):595-602[4]Wong C Y, Cheng R S, and Letaief K B, et al.. MultiuserOFDM with adaptive subcarrier, bit, and power allocation[J].IEEE Journal on Selected Areas in Communications.1999,17(10):1747-1758[5]Vucetic B. An adaptive coding scheme for time-varyingchannels[J].IEEE Transaction on Communication.1991,39(2):653-663[6]Rhee W and Cioffi J M. Increase in capacity of multiuserOFDM system using dynamic subchannel allocation[C].//Vehicular Technology Conference. Tokyo: IEEE VTS 51th,2000(2): 1085-1089.[7]Chen Y F, Chen J W, and Li C P. A fast suboptimalsubcarrier, bit, and power allocation algorithm for multiuserOFDM-based systems[J]. IEEE Communications Society,2004, (6): 3212-3216.[8]Goldsmith A and Jafar S A, et al.. Capacity limits of MIMOchannels[J].IEEE Journal on Selected Areas inCommunications.2003, 21(5):684-702[9]Xia P F and Zhou S L, et al.. Adaptive MIMO-OFDM basedon partial channel state information[J].IEEE Trans. onSignal Processing.2004, 52(1):202-213[10]Jang J and Lee K B. Transmit power adaptation formultiuser OFDM systems[J].IEEE Journal Selected Areas inCommunications.2003, 21(2):171-178 -
计量
- 文章访问数: 3047
- HTML全文浏览量: 77
- PDF下载量: 801
- 被引次数: 0
下载:
