CN108234090B - 一种大规模mimo系统中跨层优化设计方法 - Google Patents
一种大规模mimo系统中跨层优化设计方法 Download PDFInfo
- Publication number
- CN108234090B CN108234090B CN201810024795.8A CN201810024795A CN108234090B CN 108234090 B CN108234090 B CN 108234090B CN 201810024795 A CN201810024795 A CN 201810024795A CN 108234090 B CN108234090 B CN 108234090B
- Authority
- CN
- China
- Prior art keywords
- packet
- cross
- combination
- average
- error rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
本发明提供了一种大规模MIMO系统中结合AMC和HARQ的跨层优化设计方案。本发明以大规模MIMO系统的平均频谱效率最大化作为优化目标,以大规模MIMO系统数据传输的调制方式和HARQ机制的误包率作为优化变量,在最大丢包率的约束下,提出了针对大规模MIMO的跨层设计方案。本发明所提供的方法不仅不需要较高的计算复杂度,而且相对于传统的跨层优化方案,可以有效的提高系统的平均频谱效率。
Description
技术领域
本发明属于移动通信领域,涉及移动通信系统的跨层优化设计方法,主要是关于大规模MIMO系统中的跨层优化设计方案及其次优简化方案。
背景技术
在无线通信网络中,由于信道衰落的存在,系统的性能会被极大的削弱。一种能降低信道衰落对系统性能的影响的技术是自适应调制编码(AMC,Adaptive Modulation andCoding)技术,AMC能在时变信道下动态地调整发送速率,在物理层层面上已经有了广泛的研究和应用。然而,为了实现物理层的高可靠性,AMC技术必须要采用较小尺寸的星座图调制来降低发送速率。
另一种减轻信道衰落影响的技术是数据链路层的自动重传请求(ARQ,AutomaticRepeat reQuest)协议,采用ARQ协议的通信网络在检测到错误数据包的时候会请求重传。这种协议由于只有在需要的时候才会重传,所以能有效的提高系统的吞吐量。传统的ARQ协议虽然在检测到错误的时候会请求重传来提高系统可靠度,但是发生错误的数据包就被直接丢弃。然而就算是错误的数据包,仍然含有大量有用的信息,因此人们又提出了混合ARQ(HARQ,Hybrid ARQ)的方案,混合ARQ能够将出错的数据包和再次重传的数据包按照指定的方式进行合并,进而充分地利用所有发送的数据包,进一步提高了ARQ的性能。
随着移动通信系统的不断发展,多输入多输出(MIMO,Multiple-Input Multiple-Output)系统应运而生。由于其能够极大地提高系统的性能,在4G中已经得到了广泛的应用。近年来的研究发现,随着MIMO系统发射天线数的大幅度增加,MIMO系统的性能能够得到进一步地提升,这就是大规模MIMO系统。大规模MIMO能提供许多传统MIMO所没有的优点,如信道正交、波束集中、能效较高等等,所以,在5G标准化的过程中,大规模MIMO逐渐成为了移动通信的核心技术,充分利用大规模MIMO的性能优势也成为近年来的热门研究课题。
文献1(Liu,Qingwen,Shengli Zhou,and Georgios B.Giannakis.Cross-layercombining of adaptive modulation and coding with truncated ARQ over wirelesslinks.IEEE Transactions on wireless communications 3.5(2004):1746-1755.)研究了AMC和中断式ARQ联合的跨层优化方案,系统建立在传统的SISO模型上,且并未考虑HARQ。文献2(Zhang,Peng,Yuzhuang Miao,and Yuping Zhao.Cross-layer design of AMC andtruncated HARQ using dynamic switching thresholds.Wireless Communications andNetworking Conference(WCNC),2013 IEEE.IEEE,2013.)使用了动态门限来优化AMC结合HARQ的跨层设计。文献3(Aniba,Ghassane,and Sonia Aissa.Cross-layer designedadaptive modulation algorithm with packet combining and truncated ARQ overMIMO Nakagami fading channels.IEEE Transactions on Wireless Communications10.4(2011):1026-1031.)考虑了传统MIMO场景下的AMC结合HARQ的跨层设计方案。文献4(Zhou,Yuehao,et al.A Low-Complexity Multiuser Adaptive Modulation Scheme forMassive MIMO Systems.IEEE Signal Processing Letters 23.10(2016):1464-1468.)提出了一种低复杂度的大规模MIMO下的AMC方案。上述文献都没有针对大规模MIMO下的跨层优化问题做研究,因此亟需对大规模MIMO中的AMC结合HARQ跨层设计进行优化。
发明内容
发明目的:为提高大规模MIMO系统的性能,本发明提出了一种上行大规模MIMO系统中结合AMC和HARQ的跨层设计优化方案。该方案可以在给定目标丢包率的要求下,动态地调整每次重传的误包率,尽可能地提高系统性能,同时,该方案利用了大规模MIMO信道趋于正交的特性,能极大降低优化过程的复杂度。
本发明的技术方案是一种大规模MIMO系统中跨层设计的优化方法,其设计的要点包括以下几个步骤:
(3)在第(2)步计算得到的所有的中,选择符合丢包率要求的组合使得其中ni表示组合中第i次传输所采用的调制方式,为平均丢包率限制。计算不同误包率组合下平均频谱效率其中为每个数据包的平均发送次数, 为第ni种调制方式的速率,为任意一个数据包是第i次发送的数据包的概率。
(4)比较(3)中得到的不同误包率组合下的平均频谱效率,选择频谱效率最大的组合作为最优组合,该组合包含了AMC调制方式的选择和HARQ最优误包率的配置,在数据传输过程中,根据得到的最优组合采用相应的调制方式,然后在接收端将接收到的数据包进行比特级的Chase HARQ合并,合并后的数据包如果检测到错误,则给发送端回馈一个重传请求,否则直接输出。
有益效果:与现有技术相比,本发明具有以下优点:
利用大规模MIMO的信道正交特性,将传统的连续跨层优化问题简化为离散有限集的优化问题,极大地降低的多维搜索的成本。另外,本发明考虑到连续两次重传很难保证在相干时间内完成,因此每次重传的信道条件是不同的,更加符合实际的信道模型。
附图说明
图1为本发明实施例的流程图;
图2为本发明实施例中跨层系统的模型图;
图3为实施例的仿真结果与传统跨层设计的仿真结果对比图。
具体实施方式
为了阐明本发明的技术方案及技术目的,下面结合附图及具体实施方式对本发明做进一步的介绍。
本发明方法中涉及到的硬件装置包括安置在小区中心的集中式大规模天线基站(BS,Base Station)、小区内的移动台(MS,Mobile Station)。在本实施方式中,基站装配有M根天线,小区内有K个单天线移动台。定义G=HD1/2为上行信道矩阵,其中H∈CM×K为移动台到基站的小尺度衰落矩阵,D∈CK×K为移动台到基站的大尺度衰落对角矩阵,包括阴影衰落和路径损耗,其对角元素为[D]kk=βk=sk(d0/dk)v,其中sk为阴影衰落,dk为第k个移动台距基站的距离,d0为参考距离,v为路径损耗因子。跨层系统工作流程如图2所示。
本发明是一种大规模MIMO系统中跨层设计的优化方法,包括以下步骤:
步骤1基站端通过估计信道信息,采用特定的检测算法对接收到的信号进行检测。为了消除用户间的干扰,基站采用迫零(ZF,Zero-Forcing)算法进行信号检测,因此,基站接收到的第k个移动台的信号接收信噪比为:
对于大规模天线,有
所以基站接收到的第k个移动台的信号接收信噪比渐进近似于在这种近似下,由于小尺度衰落信道近似正交,平均误包率的计算就不需要再对小尺度衰落进行复杂的积分就可以得到,进而,最优AMC机制所需要的动态门限优化此处也可近似省略。
步骤2基于步骤1获得的近似接收信噪比计算不同传输次数下采用不同调制方式时的平均误包率 表示第i次传输中采用第n种调制方式的平均误包率,由于基站端对接收到的数据包采用Chase合并的方式进行合并,所以瞬时误包率可以通过对不同调制方式下的误包率曲线进行如下拟合得到
拟合操作在只需要提前做一次,在后续的所有迭代或者检测中都可以重复利用之前得到的拟合系数。
因此,任选一个发送的数据包是第i次发送的概率(等效于所有发送数据包中,第i次发送的数据包所占的概率)为:
步骤4重复步骤3,比较不同组合下的平均频谱效率,选择频谱效率最大的组合作为最优组合,该组合指定了最优HARQ误包率的设置,也就同时隐性给出了最优AMC调制方式的选择。
为了说明本发明算法的有效性,通过MATLAB平台模拟仿真,对比已有的跨层优化算法和本发明在相同环境下的频谱效率特性,如图3所示。
仿真中为便于分析,忽略了小区间的干扰。附图3给出了大规模MIMO系统在不同的发送信噪比γ下的频谱效率特性。仿真结果表明,本发明所提出的方案较传统的跨层优化方案有明显的频谱效率性能提升,相较于最优的算法而言,性能损失很小,但是时间成本要降低不少,即以较低的复杂度实现了较高的频谱效率性能。从图中可以看出,随着发送信噪比的增加,平均频谱效率会随之提升,并且逐渐达到饱和,这是因为在AMC中,已经采用了最高等级的调制方式,即使信道条件再好,频谱效率也很难再次得到提升。
综上所述,本发明提出的方法能有效地进行大规模MIMO系统中的跨层优化设计,同时方法实现的复杂度也较低。这充分说明了本发明提出的大规模MIMO系统中的跨层优化设计的有效性。
以上显示和描述了本发明的基本原理、主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,本发明要求保护范围由所附的权利要求书、说明书及其等效物界定。
Claims (3)
1.一种大规模MIMO系统中跨层设计的优化方法,其特征在于:包括以下步骤:
(3)在第(2)步计算得到的所有的中,选择符合丢包率要求的组合使得其中ni表示组合中第i次传输所采用的调制方式,为平均丢包率限制;计算不同误包率组合下平均频谱效率其中为每个数据包的平均发送次数,为第ni种调制方式的速率,Pi N为任意一个数据包是第i次发送的数据包的概率;
(4)比较(3)中得到的不同误包率组合下的平均频谱效率,选择频谱效率最大的组合作为最优组合,该组合包含了AMC调制方式的选择和HARQ最优误包率的配置,在数据传输过程中,根据得到的最优组合采用相应的调制方式,然后在接收端将接收到的数据包进行比特级的Chase HARQ合并,合并后的数据包如果检测到错误,则给发送端回馈一个重传请求,否则直接输出。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810024795.8A CN108234090B (zh) | 2018-01-08 | 2018-01-08 | 一种大规模mimo系统中跨层优化设计方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810024795.8A CN108234090B (zh) | 2018-01-08 | 2018-01-08 | 一种大规模mimo系统中跨层优化设计方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN108234090A CN108234090A (zh) | 2018-06-29 |
CN108234090B true CN108234090B (zh) | 2020-11-24 |
Family
ID=62640850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201810024795.8A Expired - Fee Related CN108234090B (zh) | 2018-01-08 | 2018-01-08 | 一种大规模mimo系统中跨层优化设计方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN108234090B (zh) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113691287B (zh) * | 2020-05-18 | 2022-10-04 | 南京航空航天大学 | 一种基于平均误比特率约束的大规模mimo系统自适应调制方法 |
CN112039568B (zh) * | 2020-08-11 | 2022-06-17 | 南京航空航天大学 | 基于不完全信道状态信息的大规模mimo系统跨层设计方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101039165B (zh) * | 2006-03-14 | 2011-07-06 | 华为技术有限公司 | 基于多天线自适应调制编码的信息反馈方法及其装置 |
CN101621316B (zh) * | 2008-06-30 | 2012-08-01 | 电信科学技术研究院 | 一种实现发射功率控制的系统及方法 |
CN101990213B (zh) * | 2009-07-30 | 2014-03-12 | 华为技术有限公司 | 发射天线位置的获取方法及装置 |
KR101688546B1 (ko) * | 2010-09-29 | 2016-12-21 | 삼성전자주식회사 | Lte시스템에서 phich에 의한 역방향 mimo 재전송을 위한 송수신 방법 및 장치 |
CN102497222B (zh) * | 2011-12-26 | 2014-04-09 | 桂林电子科技大学 | 一种su-mimo和mu-mimo模式的自适应切换方法和装置 |
CN105024781B (zh) * | 2014-04-30 | 2019-06-21 | 中兴通讯股份有限公司 | 一种反馈信息的处理方法、装置及系统 |
CN105163380B (zh) * | 2015-09-23 | 2018-05-01 | 浙江理工大学 | Mimo无线多跳网络的分布式跨层优化方法 |
-
2018
- 2018-01-08 CN CN201810024795.8A patent/CN108234090B/zh not_active Expired - Fee Related
Non-Patent Citations (9)
Title |
---|
Cross-layer design for cooperative MIMO systems with relay selection and imperfect CSI;YU XiangBin,ZHOU TingTing等;《SCIENCE CHINA》;20130228;全文 * |
Cross-layer Design for Space-time coded MIMO Systems over Rice Fading Channel;Xiangbin Yu,Tingting Zhou等;《2012 International Conference on Medical Physics and Biomedical Engineering》;20121231;全文 * |
Cross-layer design of combining AMC with HARQ in cooperatiVe relay system with perfect and imperfect CSI;唐伦,张荣荣,陈前斌;《Journal of Harbin Institute of Technology》;20121231;全文 * |
Performance of cross-layer design for orthogonal space-time block coded MIMO systems with imperfect CSI in Ricean fading channels;Xiangbin Yu,Tingting Zhou,Xiaoshuai Liu;《Telecommun Syst (2014)》;20141231;全文 * |
Performance of Cross-Layer Design with Antenna Selection and Imperfect Feedback Information in MIMO Systems;Xiaoyu Dang,Xiangbin Yu,Xiaomin Chen;《International Journal of Antennas and Propagation》;20121231;全文 * |
Performance of Cross-layer Design with Multiple Outdated Estimates in Multiuser MIMO System;Xiangbin YU,Yan LIU等;《RADIOENGINEERING》;20140930;全文 * |
Performance of Cross-Layer Design with Power Allocation in Space-Time Coded MIMO Systems;Yu Xiangbin;《Transactions of Nanjing University of Aeronautics and Astronautics》;20140831;全文 * |
Performance of heterogeneous multiuser MIMO system with cross-layer design and multiple outdated estimations in Rayleigh fading channel;Xiangbin Yu,Cheng Wang等;《Telecommun Syst (2017) 64:763–773》;20171231;全文 * |
Performance of heterogeneous multiuser MIMO system with withcross-layer design over spatially correlated Rayleigh channel;Xiangbin Yu, Sainan Qiu等;《Optik 127》;20151116;全文 * |
Also Published As
Publication number | Publication date |
---|---|
CN108234090A (zh) | 2018-06-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Benjebbovu et al. | System-level performance of downlink NOMA for future LTE enhancements | |
CN110719156B (zh) | 一种被用于无线通信的用户设备、基站中的方法和装置 | |
CN110677178B (zh) | 大规模mimo-noma系统中短包传输时延分析方法 | |
JP5345729B2 (ja) | ユーザ・データのアップリンク多地点協調伝送のための方法および装置 | |
Jin et al. | A tradeoff between single-user and multi-user MIMO schemes in multi-rate uplink WLANs | |
CN102571179B (zh) | Mimo系统中基于不完全信道状态信息的跨层优化设计方法 | |
CN110166088A (zh) | 以用户为中心的无小区mimo系统的功率控制算法 | |
CN1845467A (zh) | 一种应用于td-scdma下行链路中的结合智能天线技术的多用户发送方案 | |
CN102347820A (zh) | 一种多小区协作无线通信系统联合编解码方法 | |
Ganhao et al. | Performance analysis of an hybrid ARQ adaptation of NDMA schemes | |
CN108234090B (zh) | 一种大规模mimo系统中跨层优化设计方法 | |
US20240284203A1 (en) | Communication method, apparatus, and system, storage medium, and program product | |
Mohammadi et al. | Antenna selection in full-duplex cooperative NOMA systems | |
US8750349B2 (en) | Relay and data relay method | |
CN103269240A (zh) | 多用户mimo系统中基于不完全反馈信息的跨层设计方法 | |
Wang et al. | Intelligent hybrid automatic repeat request retransmission for multi‐band Wi‐Fi networks | |
CN105187108B (zh) | 一种基于链路自适应的分布式天线系统跨层设计方法 | |
CN107579762B (zh) | 一种基于量化和统计信道信息的多小区协作预编码方法 | |
Shen et al. | Energy efficient HARQ for ultrareliability via novel outage probability bound and geometric programming | |
WO2013051867A2 (en) | Apparatus and method for channel quality feedback with a k-best detector in a wireless network | |
CN110266408B (zh) | 一种多数据流的单输入多输出无线传输方法 | |
Ganhão et al. | Analytical evaluation of iterative packet combining and multipacket detection schemes for SC-FDE | |
KR101323378B1 (ko) | 다중 셀 다중입출력 다운링크 네트워크에서의 수신자 선택을 위해 전송률 관련 정보를 전송하는 장치 및 방법, 및 다중 셀 다중입출력 다운링크 네트워크에서의 수신자 선택 장치, 방법 및 시스템 | |
Bhuvaneswari et al. | Improving energy efficiency by HARQ mechanism over slow fading scenario for cooperative MIMO in IoT networks | |
Le et al. | Energy-efficiency analysis of antenna selection MIMO ARQ systems over Nakagami-m fading channels |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201124 Termination date: 20220108 |
|
CF01 | Termination of patent right due to non-payment of annual fee |