[1]张秀军,肖立民,周世东,等.存在传输时延差的多点协作多用户传输[J].东南大学学报(自然科学版),2012,42(6):1036-1040.[doi:10.3969/j.issn.1001-0505.2012.06.003]
 Zhang Xiujun,Xiao Limin,Zhou Shidong,et al.Multi-user coordinated multi-point transmission with different delays[J].Journal of Southeast University (Natural Science Edition),2012,42(6):1036-1040.[doi:10.3969/j.issn.1001-0505.2012.06.003]
点击复制

存在传输时延差的多点协作多用户传输()
分享到:

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
42
期数:
2012年第6期
页码:
1036-1040
栏目:
信息与通信工程
出版日期:
2012-11-20

文章信息/Info

Title:
Multi-user coordinated multi-point transmission with different delays
作者:
张秀军 肖立民 周世东 王京
清华大学电子工程系, 北京 100084
Author(s):
Zhang Xiujun Xiao Limin Zhou Shidong Wang Jing
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
关键词:
多点协作 多用户系统 定时同步 迫零预编码
Keywords:
coordinated multi-point multi-user system time synchronization zero-forcing beamforming
分类号:
TN92
DOI:
10.3969/j.issn.1001-0505.2012.06.003
摘要:
为了减少下行多点协作系统中各协作基站到用户之间时延差所引起的多用户干扰,提出了一种基于最大化信漏噪比准则的时延补偿方法.首先,根据反馈的信道状态信息和时延信息,基于最大化信漏噪比的优化准则,对每个用户在基站端的时延补偿量进行优化,并得到补偿量的闭式解; 然后根据该补偿量,在基站端对发送给每个用户的信号进行频域上的相位旋转,实现时延补偿.虽然该方法是在高信干噪比条件下通过近似得到的,但由于综合考虑了用户的信噪比以及对其他用户的干扰,因而能够实现接近最优的时延补偿.仿真结果表明,该方法能够在各种不同的信噪比下有效地补偿时延差,使系统和速率提高到接近理想无时延差场景的水平,适合于实际的多点协作多用户系统.
Abstract:
To decrease the multi-user interferences caused by the different delays from cooperative base stations to certain users in the downlink of coordinated multi-point(CoMP)systems, a delay compensation method based on the maximum signal-to-leakage and noise ratio criterion is proposed. Firstly, according to the feedback of channel state information and transmission delay information, the compensation amount for each user is optimized to obtain a closed form solution based on the maximum signal-to-leakage and noise ratio criterion. Then, the delay compensation for each user is realized by phase rotation of transmitted signals at the base station side in the frequency domain. Although it is derived by approximation at high signal-to-interference and noise ratio, the proposed method can achieve almost optimal delay compensation because of taking into account both the user’s signal-to-noise ratio and the interference to other users. The numerical simulation results show that this method can effectively compensate the different delays at various signal-to-noise ratios and improve the system sum data rate close to that of the ideal scenario without delay differences. Therefore, it is suitable for practical multi-user CoMP systems.

参考文献/References:

[1] Zhang R,Hanzo L.Cooperative downlink multicell preprocessing relying on reduced-rate back-haul data exchange [J].IEEE Trans on Vehicular Technology,2011,60(2):539-545.
[2] Zhang H,Venturino L,Prasad N,et al.Weighted sum-rate maximization in multi-cell networks via coordinated scheduling and discrete power control [J].IEEE Jour Select Areas in Commun,2011,29(6):1214-1224.
[3] Somekh O,Zaidel B M,Shamai S.Sum rate characterization of joint multiple cell-site processing [J].IEEE Trans on Information Theory,2007,53(12):4473-4497.
[4] Choi D,Lee D,Lee J H.Resource allocation for comp with multiuser MIMO-OFDMA [J].IEEE Trans on Vehicular Technology,2011,60(9):4626-4632.
[5] Bang H J,Gesbert D,Orten P.On the rate gap between multi-and single-cell processing under opportunistic scheduling [J].IEEE Trans on Signal Processing,2012,60(1):415-425.
[6] 3GPP.R1-114317 CSI feedback using multiple CSI-RS resources [S].San Francisco:3GPP,2011.
[7] Ibing A,Manolakis K.MMSE channel estimation and time synchronization tracking for cooperative MIMO-OFDM with propagation delay differences [C] //Proceedings of 2008 IEEE International Symposium on Wireless Communication Systems.Reykjavik,Iceland,2008:433-437.
[8] Sun G,Ye F.A FFT-window search algorithm for diversity combining in downlink multipoint joint transmission [C] //Proceedings of IEEE International Conference on Wireless Communications,Networking and Information Security.Beijing,China,2010:63-67.
[9] Yoo T,Goldsmith A.On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming [J].IEEE Jour Select Areas in Commun,2006,24(3):528-541.
[10] Tarighat A,Sadek M,Sayed A.A multi user beamforming scheme for downlink MIMO channels based on maximizing signal-to-leakage ratios [C] //Proceedings of IEEE International Conference on Acoustics Speech and Signal Processing.Kyoto,Japan,2005:1129-1132.
[11] 3GPP.TR 25.996-610 spatial channel model for multiple input multiple output(MIMO)simulations [S].Valbonne,France:3GPP,2003.

备注/Memo

备注/Memo:
作者简介: 张秀军(1979—),女,博士生; 周世东(联系人),男,博士,教授,博士生导师, zhousd@tsinghua.edu.cn.
基金项目: 国家重点基础研究发展计划(973计划)资助项目(2012CB316002)、国家自然科学基金创新研究群体资助项目(61021001)、国家科技重大专项资助项目(2012ZX03003007)、清华大学国际合作资助项目(2010DFB10410).
引文格式: 张秀军,肖立民,周世东,等.存在传输时延差的多点协作多用户传输[J].东南大学学报:自然科学版,2012,42(6):1036-1040. [doi:10.3969/j.issn.1001-0505.2012.06.003]
更新日期/Last Update: 2012-11-20