CN101286777A - Multi-antenna-based signal sending method, sending device and receiving device thereof - Google Patents
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Abstract
本发明公开了一种基于多天线的信号发送方法,其中包括发射端获得接收端反馈的用于指示信号发送方式的信息,发射端根据接收端反馈的所述信息,选择对应的天线组合;以及基于选择的天线组合发送Alanouti空时分组码信号。对应方法本发明还公开了相关的多天线信号发送设备和接收设备。本发明可以在MIMO通信系统中使接收端在接收信号过程中得到更好的信号分集增益。
The present invention discloses a multi-antenna-based signal transmission method, which includes that the transmitting end obtains the information used to indicate the signal transmission mode fed back by the receiving end, and the transmitting end selects the corresponding antenna combination according to the information fed back by the receiving end; and An Alanouti space-time block coded signal is transmitted based on the selected antenna combination. Corresponding method The present invention also discloses a related multi-antenna signal sending device and receiving device. The invention can enable the receiving end to obtain better signal diversity gain in the process of receiving signals in the MIMO communication system.
Description
技术领域 technical field
本发明涉及移动通信技术领域,尤其是涉及一种基于多天线的信号发送方法,及其相关的信号发送设备和接收设备。The present invention relates to the technical field of mobile communication, in particular to a multi-antenna-based signal sending method, and related signal sending equipment and receiving equipment.
背景技术 Background technique
根据移动通信理论,在移动通信系统的发射端或接收端,或者两端同时使用多天线阵列可以极大的提高系统的传输比特率。其中多输入多输出(MIMO,Multi-Input Multi-Output)技术就是根据该理论产生的信号传输技术,MIMO的具体工作原理是指在信号发射端和接收端分别使用多个发射天线和接收天线,信号通过发射端和接收端的多个天线传送和接收,从而改善每个用户的服务质量(误比特率或数据速率)。According to the theory of mobile communication, the transmission bit rate of the system can be greatly improved by using a multi-antenna array at the transmitting end or the receiving end, or at both ends of the mobile communication system. Among them, MIMO (Multi-Input Multi-Output) technology is a signal transmission technology based on this theory. The specific working principle of MIMO refers to using multiple transmitting antennas and receiving antennas at the signal transmitting end and receiving end respectively. Signals are transmitted and received through multiple antennas at the transmitter and receiver, improving the quality of service (bit error rate or data rate) for each user.
空时分组码指基于空时编码(STC,Space-Time Coding)技术对信号进行编码所得到的码字,空时编码利用了MIMO信道提供的空间分集(Diversity)增益,在常用的BER-SNR曲线中,表现为能得到较陡的斜率。STC技术中根据编码方式的不同,可以分为空时网格编码(STTC,Space Time Trellis Coding),空时拓扑编码(Space Time Turbo Coding),空时分组编码(STBC,Space TimeBlock Coding),差分空时分组编码(DSTBC)等等,其中Alamouti空时分组码方案是STBC的一个简单而经典的特例。Space-time block codes refer to the code words obtained by encoding signals based on space-time coding (STC, Space-Time Coding) technology. Space-time coding uses the space diversity (Diversity) gain provided by MIMO channels. In the curve, it is shown that a steeper slope can be obtained. According to different coding methods, STC technology can be divided into space-time grid coding (STTC, Space Time Trellis Coding), space-time topology coding (Space Time Turbo Coding), space-time block coding (STBC, Space TimeBlock Coding), difference Space-time block coding (DSTBC) and so on, among which the Alamouti space-time block code scheme is a simple and classic special case of STBC.
目前在基于多天线的MIMO通信系统中,通常会使用Alamouti空时分组码来传输信号,以获得较好的分集增益。而在Alamouti空时分组码传输技术中,发射端一般会同时使用两个发射天线,按照图1所示的发射模式进行信号发送,即在一个符号周期内一个天线发送信号a1,另一个天线发送信号-a2 *;在另一个符号周期内一个天线发送信号a2,另一个天线发送信号a1 *,其中信号a1与a1 *、信号a2与a2 *互为共轭。接收端可以使用一个或者多个接收天线进行信号的接收,以获得这两个发射天线的分集(diversity)增益。Currently, in MIMO communication systems based on multiple antennas, Alamouti space-time block codes are usually used to transmit signals to obtain better diversity gain. In the Alamouti space-time block code transmission technology, the transmitter generally uses two transmit antennas at the same time, and transmits signals according to the transmission mode shown in Figure 1, that is, one antenna transmits the signal a 1 within one symbol period, and the other antenna Send signal-a 2 * ; in another symbol period, one antenna sends signal a 2 , and the other antenna sends signal a 1 * , where signals a 1 and a 1 * and signals a 2 and a 2 * are conjugates of each other. The receiving end may use one or more receiving antennas to receive signals, so as to obtain the diversity (diversity) gain of the two transmitting antennas.
为了能够在MIMO通信系统中基于Alamouti空时分组码传输信号得到更多的分集增益,现有技术提出在开环(Open Loop)MIMO通信系统中,发射端同时使用4个天线进行信号发送,其中4个发射天线可以基于下述的MIMO模式进行信号发送:In order to obtain more diversity gain based on the Alamouti space-time block code transmission signal in the MIMO communication system, the prior art proposes that in the open loop (Open Loop) MIMO communication system, the transmitter uses 4 antennas for signal transmission at the same time, wherein The 4 transmit antennas can transmit signals based on the following MIMO modes:
上述矩阵A′的各行元素分别表示一个传输时间间隔(TTI)内的各个符号周期,而相邻的两行所对应的两个符号周期在时间域或者频率域连续,或至少相邻的两行所对应的两个符号周期的信道情况可以近似看作不变。Each row element of the above matrix A' represents each symbol period in a transmission time interval (TTI), and the two symbol periods corresponding to two adjacent rows are continuous in the time domain or frequency domain, or at least two adjacent rows The channel conditions of the corresponding two symbol periods can be approximately regarded as unchanged.
下面分别介绍TTI和符号周期的概念:The following introduces the concepts of TTI and symbol period respectively:
为了对抗信道衰落,以及信道的干扰和噪声带来的传输错误,发射端把需要传输的数据分成多个数据包(Block),对同一个数据包中的信息比特进行信道编码和交织,再调制成多个符号通过信道传输,而传输这样一个数据包所需要的时间长度决定了一个TTI的长度。接收端先接收同一个数据包内包含的所有符号,再进行解交织和解码。即一个TTI就是指传输这样一个数据包的时间间隔。In order to combat channel fading, as well as transmission errors caused by channel interference and noise, the transmitter divides the data to be transmitted into multiple data packets (Block), performs channel coding and interleaving on the information bits in the same data packet, and then modulates Multiple symbols are transmitted through the channel, and the length of time required to transmit such a data packet determines the length of a TTI. The receiving end first receives all the symbols contained in the same data packet, and then performs deinterleaving and decoding. That is, a TTI refers to the time interval for transmitting such a data packet.
而一个TTI内所传输的一个数据包内的各个符号,可以分布在时域上的不同区间,或者分布在频域上的不同区间,或者分布在时域和频域的二维平面上的不同区间。这里的一个符号周期,就是指通过信道传输的一个符号在时域上占用的区间,或者在频域上占用的区间,或者在时域和频域的二维平面上占用的区间。例如,一个数据包使用时域上的8个OFDM符号,每个OFDM符号占用频域上的16个子载波,那么一个符号周期,就是指时域和频域的二维平面上的一个区间,也就是时域上1个OFDM符号上的1个子载波,而这个数据包共有8×16=128个符号周期。Each symbol in a data packet transmitted in a TTI can be distributed in different intervals in the time domain, or in different intervals in the frequency domain, or in different intervals on the two-dimensional planes of the time domain and the frequency domain. interval. A symbol period here refers to the interval occupied by a symbol transmitted through the channel in the time domain, or the interval occupied in the frequency domain, or the interval occupied in the two-dimensional plane of the time domain and the frequency domain. For example, a data packet uses 8 OFDM symbols in the time domain, and each OFDM symbol occupies 16 subcarriers in the frequency domain. Then, a symbol period refers to an interval on the two-dimensional plane of the time domain and the frequency domain. It is one subcarrier on one OFDM symbol in the time domain, and this data packet has 8×16=128 symbol periods in total.
当采用上述的A′发射信号时,接收端接收天线的数目只需要大于1即可,可以是1,2或者4,把发射天线编号为天线1,2,3,4,可以看到在该方案中,在天线1,2上首先分别发射两个符号(symbol)向量[si si+1]和[-si+1 * si *],再在天线3,4上分别发射两个符号向量[si+2 si+3]和[-si+3 * si+2 *]。其中在天线1,2上发射的两个符号(symbol)向量[si si+1]和[-si+1 * si *]组成一组Alamouti空时分组码,而在天线3,4上发射的两个符号向量[si+2 si+3]和[-si+3 * si+2 *]组成另一组Alamouti空时分组码。When the above-mentioned A' is used to transmit signals, the number of receiving antennas at the receiving end only needs to be greater than 1, which can be 1, 2 or 4. The transmitting antennas are numbered as
但是4个天线基于这种MIMO模式进行信号发送时,在两个符号内总是从4个发射天线中选择两个天线1,2,其发射信号组成一组Alamouti空时分组码;接下来的两个符号内是从4个发射天线中选择两个天线3,4,其发射信号组成另一组Alamouti空时分组码。而从4个发射天线中选择2个发射天线,总共会有6种组合,分别为选择天线1、2,选择天线1、3,选择天线1、4,选择天线2、3,选择天线2、4,选择天线3、4,但是在这些组合中并不是每种组合都有最好的传输性能,因此发射端随机的在4个发射天线中选择2个天线进行Alamouti空时分组码发送,接收端并不一定能够得到最理想的信号分集增益。However, when 4 antennas transmit signals based on this MIMO mode, two
此外,4个发射天线还可以基于下述的MIMO模式进行信号发送:In addition, the 4 transmit antennas can also transmit signals based on the following MIMO modes:
上述矩阵的各行元素分别表示一个TTI内的各个符号周期,而接收端接收天线的数目只需要大于2即可,可以是2或者4,把发射天线编号为天线1,2,3,4,可以看到在该方案中,在两个符号周期内天线1,2的发射信号组成一组Alamouti空时分组码,天线3,4的发射信号组成另一组Alamouti空时分组码;接下来的两个符号周期内是天线1,3的发射信号组成一组Alamouti空时分组码,天线2,4的发射信号组成另一组Alamouti空时分组码;再接下来的两个符号周期内是天线1,4的发射信号组成一组Alamouti空时分组码,天线2,3的发射信号组成另一组Alamouti空时分组码。但是目前发射端的4个天线总是交替使用上述3种组合进行信号发送,但是在这些组合中并不是每种组合都有最好的传输性能,因此发射端交替使用上述3种组合进行信号发送,接收端并不一定能够得到最理想的信号分集增益。Each row element of the above matrix represents each symbol period in a TTI, and the number of receiving antennas at the receiving end only needs to be greater than 2, which can be 2 or 4, and the transmitting antennas are numbered as
发明内容 Contents of the invention
本发明实施例提出一种基于多天线的信号发送方法,以使发射端按照接收端的指示进行信号发送,从而使接收端得到更好的信号分集增益。The embodiment of the present invention proposes a multi-antenna-based signal transmission method, so that the transmitting end performs signal transmission according to the instruction of the receiving end, so that the receiving end can obtain better signal diversity gain.
本发明实施例还对应的提出了基于多天线的信号发送设备及其信号接收设备。Embodiments of the present invention also correspondingly propose a multi-antenna-based signal sending device and a signal receiving device thereof.
本发明实施例提出一种基于多天线的信号发送方法,包括步骤:发射端获得接收端反馈的用于指示信号发送方式的信息,发射端根据接收端反馈的所述信息,选择对应的天线组合;以及基于选择的天线组合发送Alamouti空时分组码信号。The embodiment of the present invention proposes a signal transmission method based on multiple antennas, including the steps: the transmitting end obtains the information used to indicate the signal transmission mode fed back by the receiving end, and the transmitting end selects the corresponding antenna combination according to the information fed back by the receiving end ; and transmitting an Alamouti space-time block coded signal based on the selected antenna combination.
较佳地所述用于指示信号发送方式的信息为:发射端和接收端约定的各个多输入多输出传输模式中的一种传输模式信息。Preferably, the information used to indicate the signal transmission mode is: one type of transmission mode information in each multiple-input multiple-output transmission mode agreed between the transmitting end and the receiving end.
较佳地所述用于指示信号发送方式的信息为:天线组合信息。Preferably, the information used to indicate the signal transmission mode is: antenna combination information.
本发明实施例还提出一种基于多天线的信号发送设备,包括信息获得单元,用于获得接收端反馈的用于指示信号发送方式的信息;天线选择单元,用于根据信息获得单元获得的发送方式信息,选择对应的天线组合;以及信号发送单元,用于基于天线选择单元选择的天线组合发送Alamouti空时分组码信号。The embodiment of the present invention also proposes a multi-antenna-based signal transmission device, including an information acquisition unit, used to obtain information indicating the signal transmission mode fed back by the receiving end; mode information for selecting a corresponding antenna combination; and a signal sending unit for sending an Alamouti space-time block code signal based on the antenna combination selected by the antenna selection unit.
本发明实施例还提出一种基于多天线的信号接收设备,包括反馈信息确定单元,用于确定向发射端反馈的用于指示信号发送方式的信息;信息反馈单元,用于将反馈信息确定单元确定的信号发送方式信息反馈给发射端。The embodiment of the present invention also proposes a multi-antenna-based signal receiving device, including a feedback information determination unit for determining the information used to indicate the signal transmission mode fed back to the transmitter; an information feedback unit for feeding back the feedback information determination unit The determined signal sending mode information is fed back to the transmitting end.
本发明实施例充分利用通信信道在一个TTI内基本保持不变的特性,提出在MIMO无线通信系统中基于Alamouti空时分组码进行信号发送的情况下,使接收端在每个TTI内、或在多个TTI内向发射端反馈一次基于Alamouti空时分组码发射信号时能够得到较好接收性能的信号发送方式信息,从而使得发射端按照接收端反馈的信号发送方式选取对应的发射天线,并基于选取的发射天线组合进行Alamouti空时分组码信号发射,基于这种处理方式将使接收端在接收信号过程中得到更好的信号分集增益。The embodiment of the present invention makes full use of the characteristics that the communication channel remains basically unchanged within a TTI, and proposes that in the case of signal transmission based on Alamouti space-time block codes in a MIMO wireless communication system, the receiving end can be configured within each TTI or within each TTI. Multiple TTIs feed back to the transmitting end the signal transmission mode information that can obtain better reception performance when transmitting signals based on Alamouti space-time block codes, so that the transmitting end selects the corresponding transmitting antenna according to the signal transmission mode fed back by the receiving end, and based on the selected The transmitting antenna combination is used to transmit the Alamouti space-time block code signal. Based on this processing method, the receiving end can obtain better signal diversity gain in the process of receiving the signal.
附图说明 Description of drawings
为使本发明的实施过程及其对应能够达到的有益效果更加明了,下面将结合各个附图对本发明技术方案的具体实施过程进行详细阐述,在各附图中:In order to make the implementation process of the present invention and the corresponding beneficial effects that can be achieved more clear, the specific implementation process of the technical solution of the present invention will be described in detail below in conjunction with each accompanying drawing. In each accompanying drawing:
图1为现有在MIMO通信系统,发射端基于Alamouti空时分组码传输技术发送信号的发射模式示意图;FIG. 1 is a schematic diagram of a transmission mode of a transmitting terminal transmitting a signal based on the Alamouti space-time block code transmission technology in an existing MIMO communication system;
图2为在发射端和接收端同时使用多天线阵列的具有空时架构的MIMO无线通信系统示意图;FIG. 2 is a schematic diagram of a MIMO wireless communication system with a space-time architecture using multiple antenna arrays at both the transmitting end and the receiving end;
图3为本发明基于多天线的信号发送方法的实施例流程图;3 is a flow chart of an embodiment of the multi-antenna-based signal transmission method of the present invention;
图4为本发明基于多天线的信号发送设备和信号接收设备的实施例组成结构框图。FIG. 4 is a structural block diagram of an embodiment of a multi-antenna-based signal sending device and a signal receiving device according to the present invention.
具体实施方式 Detailed ways
在移动通信系统中,通常一个包含有多个符号的数据包(data block)在一个传输时间间隔(TTI,Transmission Time Interval)内传输时,可以认定该TTI持续的时间足够短,也就是说在一个TTI内信道的基本情况会保持不变,拥有不变的信道矩阵H。本发明技术方案正是充分利用了通信系统的这个特点,使接收端在每个TTI内、或在多个TTI内向发射端反馈一次基于Alamouti空时分组码发射信号时能够得到较好接收性能的信号发送方式信息,从而使得发射端按照接收端反馈的信号发送方式信息选取对应的发射天线,并基于选取的发射天线组合进行Alamouti空时分组码信号发射,基于这种处理方式将使接收端在接收信号过程中得到更好的信号分集增益。In a mobile communication system, usually when a data packet (data block) containing multiple symbols is transmitted within a transmission time interval (TTI, Transmission Time Interval), it can be determined that the duration of the TTI is short enough, that is to say, in The basic situation of the channel within a TTI will remain unchanged, with a constant channel matrix H. The technical solution of the present invention makes full use of this feature of the communication system, so that the receiving end can obtain better receiving performance when feeding back a signal based on the Alamouti space-time block code to the transmitting end within each TTI or within multiple TTIs Signal transmission mode information, so that the transmitting end selects the corresponding transmitting antenna according to the signal transmission mode information fed back by the receiving end, and performs Alamouti space-time block code signal transmission based on the selected transmitting antenna combination. Based on this processing method, the receiving end will be in the A better signal diversity gain is obtained during signal reception.
请参照图2,示出了在发射端和接收端同时使用多天线阵列的具有空时架构的MIMO无线通信系统,其中在发射端一个信号流可以被分成n个不相关的码元子序列,每个子序列由n个发射天线中的其中一个进行发射。n个子序列在经过一个信道矩阵为H的信道传输后,在接收端可由n个接收天线进行接收。在该通信系统中,发射端发射天线的数目n最少为2,而接收端接收天线的数目最少是发射端的发射天线数目n。Please refer to FIG. 2 , which shows a MIMO wireless communication system with a space-time architecture using multiple antenna arrays at both the transmitting end and the receiving end, where a signal stream at the transmitting end can be divided into n uncorrelated symbol subsequences, Each subsequence is transmitted by one of the n transmit antennas. After the n subsequences are transmitted through a channel with a channel matrix H, they can be received by n receiving antennas at the receiving end. In the communication system, the number n of transmitting antennas at the transmitting end is at least 2, and the number of receiving antennas at the receiving end is at least n at the number of transmitting antennas at the transmitting end.
请参照图3,为本发明基于多天线的信号发送方法的实施例流程图,首先发射端获得接收端反馈的用于指示信号发送方式的信息,通常发射端按照该获得的信号发送方式信息基于Alamouti空时分组码发射信号时能够使接收端得到较好的接收性能(步骤10);发射端根据接收端反馈的信号发送方式信息,在配置的多个天线中选择出对应的天线组合(步骤20);然后发射端基于选择出的天线组合发送Alamouti空时分组码信号(步骤30)。Please refer to FIG. 3 , which is a flow chart of an embodiment of the multi-antenna-based signal transmission method of the present invention. First, the transmitting end obtains the information used to indicate the signal transmission mode fed back by the receiving end. Usually, the transmitting end is based on the obtained signal transmission mode information. When the Alamouti space-time block code transmits the signal, the receiving end can obtain better receiving performance (step 10); the transmitting end selects the corresponding antenna combination among the plurality of antennas configured according to the signal transmission mode information fed back by the receiving end (step 10). 20); then the transmitting end sends the Alamouti space-time block coded signal based on the selected antenna combination (step 30).
其中接收端反馈给发射端的用于指示信号发送方式的信息可以为发射端和接收端约定的各个MIMO传输模式中、能够使接收端获得较好接收性能的一个MIMO传输模式信息;还可以为能够使接收端获取较好接收性能的发射天线组合信息。The information used to indicate the signal transmission mode that the receiving end feeds back to the transmitting end may be a MIMO transmission mode information that enables the receiving end to obtain better receiving performance among the various MIMO transmission modes agreed by the transmitting end and the receiving end; Enables the receiving end to obtain transmit antenna combination information with better receiving performance.
如果发射端和接收端已经约定好各个MIMO传输模式,可以为约定的每个MIMO传输模式赋予一个标记,接收端会确定能够得到较好接收性能的MIMO传输模式,然后将确定的MIMO传输模式的标记反馈给发射端,发射端根据接收端反馈的MIMO传输模式标记,就能够得知使用何种MIMO传输模式进行Alamouti空时分组码信号发送。确定要反馈给发射端的MIMO传输模式标记的过程可以但不限于通过下述方式来实现:If the transmitting end and the receiving end have agreed on each MIMO transmission mode, a mark can be assigned to each agreed MIMO transmission mode, and the receiving end will determine the MIMO transmission mode that can obtain better reception performance, and then set the determined MIMO transmission mode The flag is fed back to the transmitting end, and the transmitting end can know which MIMO transmission mode to use for Alamouti space-time block code signal transmission according to the MIMO transmission mode flag fed back by the receiving end. The process of determining the MIMO transmission mode flag to be fed back to the transmitting end may be implemented by, but not limited to, the following methods:
接收端首先计算利用约定的各个MIMO传输模式进行Alamouti空时分组码信号发送时,分别能够得到的信息传输吞吐量,其中接收端计算按照每种MIMO传输模式基于Alamouti空时分组码进行信号发送时,接收端能够得到的信息传输吞吐量为公知技术,这里不予详细描述;接收端根据计算结果,将信息传输吞吐量最大的MIMO传输模式对应的标记信息作为要反馈给发射端的信号发送方式信息。The receiving end first calculates the information transmission throughput that can be obtained when the Alamouti space-time block code signal is transmitted using each agreed MIMO transmission mode, and the receiving end calculates the signal transmission time based on the Alamouti space-time block code according to each MIMO transmission mode , the information transmission throughput that can be obtained by the receiving end is a known technology, and will not be described in detail here; according to the calculation results, the receiving end uses the tag information corresponding to the MIMO transmission mode with the largest information transmission throughput as the signal transmission mode information to be fed back to the transmitting end .
为了使接收端在接收信号过程中获得更好的分集增益性能,可以考虑在每个TTI内,接收端分别向发射端反馈一次信号发送方式信息;当然本发明实施例这里还可以利用信道渐变的特性,要求接收端在至少两个TTI内向发射端反馈一次信号发送方式信息,即可以使接收端在每几个TTI内才向发射端反馈一次信号发送方式信息,以使在得到上述更好分集增益性能的基础上所需要的额外开销变小。In order to enable the receiving end to obtain better diversity gain performance in the process of receiving signals, it can be considered that in each TTI, the receiving end feeds back the signal transmission mode information to the transmitting end respectively; of course, the embodiment of the present invention can also use channel gradient here characteristics, the receiver is required to feed back the signal transmission mode information to the transmitter within at least two TTIs, that is, the receiver can only feed back the signal transmission mode information to the transmitter within every few TTIs, so that the above-mentioned better diversity can be obtained The additional overhead required on the basis of gaining performance becomes smaller.
依据本发明实施例的实现原理,一个具体实例可以考虑在开环(OpenLoop)MIMO通信系统中,发射端同时使用4个发射天线进行信号发送时,将其基于的MIMO发射模式:According to the implementation principle of the embodiment of the present invention, a specific example can consider that in an open-loop (OpenLoop) MIMO communication system, when the transmitting end uses 4 transmitting antennas for signal transmission at the same time, the MIMO transmission mode based on it is:
修改成为:A1′(i),i=1,2,...,6,其中分别为:Amended to become: A1'(i), i=1, 2, ..., 6, which are respectively:
其中接收端在每个TTI内、或在每几个TTI内向发射端反馈一次:决定使用A1′(i),i=1,2,...,6中的哪一个MIMO传输模式(所决定使用的这个MIMO传输模式能够使接收端得到较好的接收性能),由于发射端和接收端可以预先约定这些支持的MIMO传输模式,因此可以直接反馈所采用的MIMO传输模式标记i,然后发送端按照接收端反馈的MIMO传输模式标记i,选择对应的MIMO传输模式进行Alamouti空时分组码信号发送。The receiving end feeds back to the transmitting end once in each TTI, or in every few TTIs: decide to use which MIMO transmission mode in A1′(i), i=1, 2, ..., 6 (determined The MIMO transmission mode used can enable the receiving end to obtain better receiving performance), since the transmitting end and the receiving end can agree on these supported MIMO transmission modes in advance, so the adopted MIMO transmission mode mark i can be directly fed back, and then the transmitting end According to the MIMO transmission mode flag i fed back by the receiving end, the corresponding MIMO transmission mode is selected to transmit the Alamouti space-time block code signal.
或者将上述现有的MIMO传输模式A′修改为:A′1(m),m=1,2,3,分别为:Or modify the above-mentioned existing MIMO transmission mode A' to: A'1(m), m=1, 2, 3, respectively:
接收端在每个TTI内、或在每几个TTI内向发射端反馈一次:决定使用A′1(m),m=1,2,3中的哪一个MIMO传输模式(所决定使用的这个MIMO传输模式能够使接收端得到较好的接收性能),接收端可以直接向发射端反馈所采用的MIMO传输模式标记i,然后发送端按照接收端反馈的MIMO传输模式标记i,选择对应的MIMO传输模式进行Alamouti空时分组码信号发送。采用每几个TTI才反馈一次所采用的MIMO传输模式信息,可以减少所需的反馈信息量,节省了开销;The receiving end feeds back to the transmitting end in every TTI or every few TTIs: decide to use which MIMO transmission mode among A'1(m), m=1, 2, and 3 (the MIMO transmission mode decided to use The transmission mode can enable the receiving end to obtain better receiving performance), the receiving end can directly feed back the adopted MIMO transmission mode mark i to the transmitting end, and then the transmitting end selects the corresponding MIMO transmission mode mark i according to the MIMO transmission mode mark i fed back by the receiving end mode for Alamouti space-time block code signaling. The adopted MIMO transmission mode information is fed back once every few TTIs, which can reduce the amount of feedback information required and save overhead;
依据本发明实施例的实现原理,另一个具体实例可以考虑在开环(OpenLoop)MIMO通信系统中,发射端同时使用4个发射天线进行信号发送时,将其基于的MIMO发射模式:According to the implementation principle of the embodiment of the present invention, another specific example can consider that in an open-loop (OpenLoop) MIMO communication system, when the transmitting end uses 4 transmitting antennas for signal transmission at the same time, the MIMO transmission mode based on it is:
修改成为:B1′(k),k=1,2,3,其中分别为:Amended to become: B1'(k), k=1, 2, 3, which are respectively:
接收端在每个TTI内、或在每几个TTI内向发射端反馈一次:决定使用B1′(k),k=1,2,3中的哪一个MIMO传输模式(所决定使用的这个MIMO传输模式能够使接收端得到较好的接收性能),接收端可以直接向发射端反馈所采用的MIMO传输模式标记k,然后发送端按照接收端反馈的MIMO传输模式标记k,选择对应的MIMO传输模式进行Alamouti空时分组码信号发送。采用每几个TTI才反馈一次所采用的MIMO传输模式信息,可以减少所需的反馈信息量,节省了开销The receiving end feeds back to the transmitting end once in each TTI or every few TTIs: decide to use which MIMO transmission mode among B1'(k), k=1, 2, and 3 (the MIMO transmission mode determined to be used mode can enable the receiving end to obtain better receiving performance), the receiving end can directly feed back the adopted MIMO transmission mode mark k to the transmitting end, and then the transmitting end selects the corresponding MIMO transmission mode according to the MIMO transmission mode mark k fed back by the receiving end Perform Alamouti space-time block code signaling. The MIMO transmission mode information used is fed back once every few TTIs, which can reduce the amount of feedback information required and save overhead
请参照图4,为本发明基于多天线的信号发送设备和信号接收设备的实施例组成结构框图,其中基于多天线的信号发送设备50中包括信息获得单元501,用于获得接收端反馈的用于指示信号发送方式信息,通常发送端按照接收端反馈的信号发送方式信息进行Alamouti空时分组码信号发送时,能够使接收端得到较好的接收性能;天线选择单元502,用于根据上述信息获得单元501所获得的信号发送方式信息,选择对应的天线组合,即在配置的多个天线中选择对应的天线进行组合;以及信号发送单元503,用于基于上述天线选择单元502所选择的天线组合发送Alamouti空时分组码信号。其中信息获得单元501可以在每个TTI内获得一次接收端反馈的用于指示信号发送方式的信息,也可以在至少两个TTI内获得一次接收端反馈的用于指示信号发送方式的信息(即在多个TTI内获得一次接收端反馈的用于指示信号发送方式的信息)。其中这里的发送设备可以在现有的多天线基站设备上进行升级得到,上述各个新增加的处理单元可以基于软件程序来实现、也可以基于硬件设施来实现。Please refer to FIG. 4 , which is a structural block diagram of an embodiment of a multi-antenna-based signal sending device and a signal receiving device in the present invention, wherein the multi-antenna-based
对应的,基于多天线的信号接收设备60中包括反馈信息确定单元601,用于确定向发射端反馈的用于指示信号发送方式的信息,其中发送端按照接收端反馈的信号发送方式信息进行Alamouti空时分组码信号发送时,能够使接收端得到较好的接收性能;信息反馈单元602,用于将上述反馈信息确定单元601确定的信号发送方式信息反馈给发射端。Correspondingly, the multi-antenna-based
其中接收端向发射端反馈的信号发送方式信息可以为发射端和接收端约定的各个MIMO传输模式中的一种传输模式信息,也可以为天线组合信息。其中当反馈信息为MIMO传输模式信息时,反馈信息确定单元601中进而包括吞吐量计算子单元6011,用于计算利用发射端和接收端约定的各个MIMO传输模式进行Alamouti空时分组码信号发送时,分别能够得到的信息传输吞吐量,其中计算利用每种MIMO传输模式基于Alamouti空时分组码进行信号发送时,接收端能够得到的信息传输吞吐量处理过程属于公知技术,这里不再给予详细阐述;以及信息确定子单元6012,用于根据吞吐量计算子单元6011的计算结果,将信息传输吞吐量最大的MIMO传输模式对应的信息作为要反馈给发射端的传输模式信息。这里仅仅是列举了一种反馈信息确定单元601确定要反馈给发射端的信号发送方式信息的一种较佳实现方式,除此之外不排除其它可以确定要反馈给发射端信号发送方式信息的其它实现方式。其中反馈信息确定单元601可以在每个TTI内确定一次信号发送方式信息,相应地信息反馈单元602在每个TTI内向发射端反馈一次信号发送方式信息。此外反馈信息确定单元601还可以在至少两个TTI内确定一次信号发送方式信息,相应地信息反馈单元602在至少两个TTI内向发射端反馈一次信号发送方式信息,这里选择每多个TTI确定一次信号发送方式信息并向发射端进行反馈是考虑到信道的渐变特性,以节约反馈信息所占用的信道开销。同理,这里的接收设备也可以在现有的多天线基站设备上进行升级得到,上述各个新增加的处理单元可以基于软件程序来实现、也可以基于硬件设施来实现。The signal transmission mode information fed back by the receiving end to the transmitting end may be one of the transmission mode information in each MIMO transmission mode agreed by the transmitting end and the receiving end, or may be antenna combination information. Wherein when the feedback information is MIMO transmission mode information, the feedback
综上所述,本发明实施例在MIMO无线通信系统中,在基于Alamouti空时分组码进行信号发送的过程中,增加由接收端向发射端反馈所采用的信号发送方式信息的处理,其中发射端按照反馈的信号发送方式基于Alamouti空时分组码进行信号发送时,能够使接收端得到较好的接收性能,这样发射端按照接收端反馈的信号发送方式信息选择相应的发射天线组合进行Alamouti空时分组码信号发送时,可以使接收端在基于多天线进行信号接收时得到更好的分集增益性能。相应本发明实施例中接收端可以在多个TTI中才向发射端反馈一次信号发送方式信息,这样可以在得到较好分集增益性能的基础上,进一步减小传输信道的额外开销。To sum up, in the embodiment of the present invention, in the MIMO wireless communication system, in the process of signal transmission based on the Alamouti space-time block code, the process of feeding back the signal transmission mode information adopted by the receiving end to the transmitting end is added, wherein the transmitting When the terminal transmits the signal based on the Alamouti space-time block code according to the feedback signal transmission method, the receiving terminal can obtain better receiving performance, so that the transmitting terminal selects the corresponding transmitting antenna combination according to the signal transmission method information fed back by the receiving terminal to perform Alamouti space-time block coding. When the time block code signal is sent, the receiving end can obtain better diversity gain performance when receiving the signal based on multiple antennas. Correspondingly, in the embodiment of the present invention, the receiving end can feed back the signal transmission mode information to the transmitting end only once in multiple TTIs, so that the additional overhead of the transmission channel can be further reduced on the basis of better diversity gain performance.
显然,本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.
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