CN1643819A - 利用接收机功能的传送处理 - Google Patents
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Abstract
数据是在一码分多址通讯***中传输。一信道响应是按照一信道响应矩阵H所提供,该信道响应矩阵近似于该数据在传输的后会遇到的信道。该数据被扩展,并且会使用该信道响应矩阵H来处理该扩展的数据。传输该扩展且处理的数据。从该所传输的扩展且处理的数据来接收及还原该数据。
Description
技术领域
本发明是广泛关于无线展频通讯***。具体而言,本发明是关于在与此类通讯***的数据传输与接收。
背景技术
在码分多址(CDMA)通讯***中,可透过一共享展频同时传送多个通讯。每个通讯都是藉由用于传输各自通讯的编码来区别。
在某些CDMA通讯***中,为了更适当地利用共享频谱,会将频谱以分时方式分割成具有预先决定数量时隙的帧,例如,十五个时隙。此类型***被称为混合式CDMA/分时多向近接(TDMA)通讯***。其中一种此类型***是分时多任务通讯(TDD)***,用于将上行链路通讯及下行链路通讯限制在特定时隙。
一种用于接收在共享频谱内所传输的多个通讯的做法是结合侦测(joint detection)。在结合侦测中,会一起决定来自多个通讯的数据。在接下来的说明中,一大写符号X表示一矩阵,而符号
表示一行向量。通常会按方程式1制作该结合侦测的模型:
其中A(k)表示用户k对该***传输矩阵A的比重。每个用户***传输矩阵都是信道脉冲响应与该用户的扩展码的函数,如方程式3所示:
A(k)=H(k)C(k) 方程式3
其中H(k)表示信道响应矩阵,而C(k)表示用户k的编码矩阵。
数据向量
的最小均方误差(Minimum Mean Square Error;MMSE)是从方程式4求得:
其中Rn是噪声的共变异数矩阵(covariance matrix)。当噪声是白噪声时,Rn是一对角线矩阵,而该数据的MMSE估计是按方程式5A和5B求得:
或者,可将方程式5A写成:
可使用矩阵反转辅助定理(matrix inversion lemma)将方程式5A和5B互换。
同样地,一强制零(zero forcing;ZF)估计是从方程式6A和6B求得:
可将方程式6A写成:
可使用矩阵反转辅助定理(matrix inversion lemma)将方程式6A和6B互换。
在CDMA***中,当所有编码都通过同一传播信道时(如同典型的下行链路传输),或当一上行链路用户独占一时隙(H(k)=H)时,扩展符号
的传输向量是从方程式7求得:
所接收信号是使用方程式8制作模型:
扩展符号
的MMSE估计是按方程式9A和9B求得:
或相等的方程式:
可使用矩阵反转辅助定理(matrix inversion lemma)将方程式9A和9B互换。
的ZF估计(从方程式6推导出)是按方程式10A和10B求得:
或相等的方程式:
可使用矩阵反转辅助定理(matrix inversion lemma)将方程式10A和10B互换。
扩展符号的估计后可能接着一编码匹配滤波器(Matched Filter;MF),以还原数据符号。
当在接收机上使用多个天线时,方程式1也可表示所接收的向量。所涉及的向量和矩阵的定义经过修改,以表示来自不同天线的比重,如方程式11所示:
其中
是合成的接收信号,而A′m(m=1,2,...,M)是从第m个发射组件至接收机的信号传输的***传输矩阵,
是从第m个发射组件传输的数据向量。
由第i个天线组件所导致的A成分标示为Ai′。每个Ai′成分都具有来自所有K个用户的比重,如方程式14所示:
每个用户对每个天线组件的比重是信道脉冲响应与扩展码(从方程式3推导出)的函数,如方程式15所示:
A′(k)=H′(k)C(k) 方程式15
位于发射机与接收机上的多个天线被称为多重输入多重输出(Multiple Input Multiple Output;MIMO)通讯***。方程式11所表示的MIMO***的所接收信号可被重写为方程式16。
其中N是接收天线数量;M是发射天线数量;An(n=1,2,...,N)是用于接收的传输矩阵;及A′m(m=1,2,...,M)是用于传输的传输矩阵。运用所涉及的向量和矩阵的适当定义,可将以方程式16重写为方程式17:
其中是发射和接收的合成***传输矩阵。方程式5中所示的数据向量的MMSE估计是由方程式18A和18B表示:
或相等的方程式:
可使用矩阵反转辅助定理(matrix inversion lemma)将方程式18A和18B互换。
同样地,可从方程式19A和19B求得强制零(ZF)估计:
或相等的方程式:
可使用矩阵反转辅助定理(matrix inversion lemma)将方程式19A和19B互换。
一种实施这些做法的接收机会高效率执行一高度复杂度的矩阵反转。为了减少复杂度,使用一近似Cholesky分解或快速傅立叶转换。虽然这些做法减少接收机复杂度,然而希望具有替代做法以简化数据的传输与接收
发明内容
在本发明***中,一信道响应是按照一信道响应矩阵H来决定,该信道响应矩阵近似于该数据在传输的后会遇到的信道。所要传输的数据被扩展,并且会使用该信道响应矩阵H来处理该扩展的数据。接着,传输该扩展且处理的数据。从该所传输的扩展且处理的数据来接收及还原该数据。
附图说明
图1显示运用在使用接收机功能的传输处理的发射机和接收机的较佳简化图。
图2为显示使用接收机功能进行传输的流程图。
具体实施方式
本发明***是配合一CDMA***的分时多任务(TDD)模式来说明(例如,第三代合伙项目(Third Generation Partnership Project;3GPP)广频CDMA***的建议TDD模式。然而,本发明适用于任何展频通讯***,例如,分频时双工(FDD)***或同步分时码分多址(time division synchronouscode division multiple access;TD-SCDMA)***。
图1显示运用在使用接收机功能的发射处理的发射机10和接收机12的较佳简化图。该发射机10可能位于基站、用户装备(UE)或两者上,而该接收机12可能位于用户装备(UE)、基站或两者上。要从发射机10传输至接收机12的数据被输入至一扩展调制装置14及一预先均衡器15。数据可能是用于传送至单一接收机的单一编码传输、用于传送至单一接收机的多编码传输、用于传送至多个接收机的单一编码传输、用于传送至多个接收机的多编码传输、用于传送至多个接收机的单一编码传输和多编码传输的组合。
处理数据的方式为:使用适当编码将数据扩展,被预先等化以补偿无线电接口18的预期信道响应及调制(例如,使用四相位相移键控(quadraturephase shift keying;QPSK)、M元四相位振幅调制(Quadrature AmplitudeModulation;QAM)或其它调制机制),以及向上转换成射频。一天线或M个组件天线数组161到16M透过一无线电接口18发射该射频信号。
位于接收机12上的一天线或N个组件天线数组201至20N接收所发射的信号与其它信号和噪声,而成为一接收向量
一数据侦测器22处理该接收向量以还原数据
由于发射机10上的预先等化,所以该数据侦测器22的结构最好比典型结合侦测接收机更简化,例如,藉由编码匹配滤波器实施。
预先等化利用可在一接收机12上使用信道和编码信息,以适当处理该传输向量,以至于当该接收机12接收到该信号时,已补偿该信号的信道损伤。信道信息可能是从该接收机12发出的信号,可能是从相同频谱内的发射机10上所接收到的信号推导出。基于解说,针对TDD/CDMA通讯***的基站,在可一上行链路时隙上搜集一后续下行链路传输时隙的信道信息。
当使用该发射机10的处理结果时,从方程式20A求得该接收信号:
就信道和编码矩阵而论,该方程式20A变成方程式20B:
依据传输机制,编码矩阵C1到CM有所不同。其中一种此类***是空间编码发射散布(space code transmit diversity;SCTD),其中会将一不同的传输码指派给每个天线。在某些发射散布机制中,每个天线可使用相同的编码矩阵。其中一种此类机制是发射调节型天线(TxAA)。虽然使用接收机功能的发射处理是配合用于发射相同编码矩阵C的每个天线来说明,然而同样适用于编码矩阵因天线而异的使用类似做法的***。
在某些***中,传输数据位
到
可能依据传输机制而不同,具体而言,是否使用发射散布。虽然类似的做法适用于按天线而具有不同数据向量的***,但是接下来的说明是配合每个天线传输相同数据向量
就从每个天线传输相同数据和编码矩阵的***而言,按方程式21制造***模型:
方程式22显示传输向量:
方程式右方的H的伪反转是HH(HHH)-1。处理后的数据信号是使用此伪反转传输。据此,方程式23显示该传输信号
方程式24显示产生的接收向量:
如果预先等化非常理想,则会在接收机12接收到清晰的信号,而不需要进一步处理。然而,实施上由于噪声和信道状况变化,所以通常所接收信号会发生一些降级。然而,大幅减少去除降级的必要处理,进一步增加接收机12的必要复杂度。
MMSE或ZF型接收机的优点的一为,MMSE或ZF电路通常会在发射机10端上。基于解说,基站通常具有一MMSE型接收机。据此,在基站上可使用单一MMSE电路来处理所接收的数据和所传输的数据。因此,接收机12的电路及使用接收机功能来实施发射处理的发射机10可能被与具有简化电路的其它通讯单元一起并入用户装备(UE)或基站中。
例如,基站可使用预先等化发射机10和一MMSE接收机。可以藉由相同电路来执行矩阵或高效率矩阵反转。因此,用户装备(UE)上的接收机电路可被简化,例如,单一编码匹配滤波器或编码匹配滤波器群组。简化的接收机电路还可以延长接收机12上的电池寿命。
常用的电路不限于MMSE或ZF接收机电路,而是一般的任何接收机12结构,其中接收机结构能够执行适合在发射机10上处理的矩阵运算及计算矩阵反转。预先等化的其它优点为,所传输信号被锁定在接收机12。尤其就下行链路信号而言,对其他用户的干扰减少。
请参阅图2,图中显示根据本发明的方法30。该方法从获得无线信道信息开始,该无线信道信息的形式最好是一信道脉冲响应H(步骤32)。接着,使用该信道响应矩阵H预先等化用于传输的数据(步骤34)。透过一无线电接口来传输该已预先等化的数据(步骤36),并且在接收机上按照一接收向量来接收数据(步骤38)。接着,从该接收向量来还原该数据,例如,使用编码匹配滤波器(步骤40)。
Claims (16)
1.一种用于在一码分多址通讯***中传输数据的方法,该方法包括:
按照一信道响应矩阵H来提供一信道响应,该信道响应矩阵近似于该数据在传输的后会遇到的信道;
扩展该数据,并且使用该信道响应矩阵H来处理该扩展的数据;
从一发射机传输该已扩展且处理的数据;以及
在一接收机上,从该所传输的扩展且处理的数据来接收及还原该数据。
2.如权利要求1所述的方法,其中处理该已扩展数据的方式为,将该已扩展数据乘HH(HHH)-1。
3.如权利要求1所述的方法,其中该数据还原的方式为,编码匹配滤波该接收数据,而不需要等化。
4.如权利要求1所述的方法,其中该所提供的信道响应是来自该发射机在一相同于传输该已展频且处理的数据的频谱中所接收的信号。
5.如权利要求1所述的方法,其中该所提供的信道响应是从该接收机发出的信号。
6.如权利要求1所述的方法,其中该所提供的信道响应矩阵是在该发射机上评估。
7.一种基站,包括:
一扩展装置,用于使用一编码来扩展数据;
一预先均衡器,用于使用一提供的信道响应矩阵H来处理该扩展数据,该信道响应矩阵近似于该数据在传输的后会遇到的信道;以及
一天线,用于发射该已处理的扩展数据。
8.如权利要求7所述的基站,其中处理该已扩展数据的方式为,将该已扩展数据乘HH(HHH)-1。
9.如权利要求7所述的基站,其中该所提供的信道响应是从该基站在一相同于传输该已处理的展频数据的频谱中所接收的信号来评估。
10.如权利要求7所述的基站,其中该所提供的信道响应是发送至该基站的信号。
11.如权利要求7所述的基站,其中该所提供的信道响应是在该基站上评估。
12.一种用户装备,包括:
一扩展装置,用于使用一编码来扩展数据;
一预先均衡器,用于使用一信道响应矩阵H来处理该扩展数据,该信道响应矩阵近似于该数据在传输的后会遇到的信道;以及
一天线,用于发射该已处理的扩展数据。
13.如权利要求12所述的用户装备,其中处理该已扩展数据的方式为,将该已扩展数据乘HH(HHH)-1。
14.如权利要求12所述的用户装备,其中该所提供的信道响应是从该用户装备在一相同于传输该已处理的展频数据的频谱中所接收的信号来评估。
15.如权利要求12所述的用户装备,其中该所提供的信道响应是发送至该用户装备的信号。
16.如权利要求12所述的用户装备,其中该所提供的信道响应矩阵是在该用户装备上评估。
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CN 200910169008 Division CN101651642B (zh) | 2002-03-28 | 2003-03-27 | 利用接收机功能的传送处理 |
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EP (1) | EP1488543B1 (zh) |
JP (2) | JP4068065B2 (zh) |
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CN (2) | CN100536366C (zh) |
AR (1) | AR039188A1 (zh) |
AU (1) | AU2003222091A1 (zh) |
CA (1) | CA2480533A1 (zh) |
DE (2) | DE20305080U1 (zh) |
HK (2) | HK1055209A2 (zh) |
MY (1) | MY167477A (zh) |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105790819A (zh) * | 2014-12-25 | 2016-07-20 | 重庆重邮信科通信技术有限公司 | 一种mimo信号接收方法和装置 |
CN105790819B (zh) * | 2014-12-25 | 2023-05-19 | 锐迪科(重庆)微电子科技有限公司 | 一种mimo信号接收方法和装置 |
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