CN101243631B - 用于在通信系统中执行率选择的方法和装置 - Google Patents
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Abstract
描述了用于使用单个码率和不同调制方案将多个数据流发送到单个接收机的技术。确定这多个数据流的信道估计并使用该估计选择这多个数据流的单个码率和多个调制方案。该系统可支持一码率集,并且每个码率可以与可用于该码率的相应调制方案集相关联。从被支持的码率的该集合当中选择所有数据流的单个码率并从与该单个码率相关联的调制方案集当中选择每个数据流的调制方案。这多个数据流被根据该单个码率编码。每个数据流进一步根据所选的用于该流的调制方案被调制。
Description
依据35U.S.C§119要求优先权
本专利申请要求提交于2005年6月16日并被转让给其受让人的题为“Coding and Modulation for Multiple Data Streams in a Communication System(通信系统中多个数据流的编码和调制)”的临时申请S/N60,691,461的优先权,该临时申请通过援引被明确地包括于此。
技术领域
本公开一般涉及通信,尤其涉及通信系统中发送多数据流的技术。
背景技术
在通信系统中,发射机通过多传输信道将多个数据流发送到接收机。传输前,发射机通常将每个流的数据编码并调制(或码元映射)以对抗不利的信道状况。接收机执行互补的解调并解码以恢复发射机发送的数据。发射机所执行的编码和调制对数据传输的性能具有较大影响。
率选择是指为每个数据流选择恰当的编码和调制方案以实现指定的性能级别,该性能级别可由目标误包率(PER)来量化。率选择是具有挑战性的,因为传输信道可能会经历不同的信道条件(例如,不同的衰落、多径、以及干扰效应)并且可能会达到不同的信号噪声干扰比(SNIR)。传输信道的SNIR确定了其传输能力,该传输能力通常由可在该传输信道上可靠地发送的特定数据率来量化。如果传输信道之间的SNIR变化,则所支持的数据率也将在信道之间变化。此外,如果信道条件随时间变化,则这些传输信道所支持的数据率也将随时间变化。
因此,本领域中需要一种以实现良好性能并简化率选择的方式来执行多数据流的编码和调制的技术。
发明内容
这里描述了使用单个码率和不同调制方案来将多数据流发送到单个接收机的技术。这些技术可简化编码和解码,可简化率选择和/或减少要发送的率信息的量,并可提高性能。
根据本公开的一个实施例,描述了一种包括控制器和处理器的装置。该控制器获得对要发送到单个接收机的多数据流的单个码率和多个调制方案的选择。该处理器根据该单个码率来将多数据流编码并根据这多个调制方案来调制该多数据流。
根据另一实施例,描述了一种包括处理器和控制器的装置。该处理器确定要发送到单个接收机的多个数据流的信道估计。该控制器基于这些信道估计来选择这多个数据流的单个码率和多个调制方案。
以下进一步具体地描述了本公开的各个方面和实施例。
附图说明
图1示出了根据一个实施例的多信道通信系统中的发射机和接收机的框图。
图2示出了根据一个实施例的使用单个码率和不同调制方案将多个数据流发送到单个接收机的过程。
图3示出了根据一个实施例的为多个数据流选择率以使得每个流具有独立的率的过程。
图4示出了根据一个实施例使用向量量化率集选择多个数据流的率的过程。
图5示出了根据一个实施例的发送(TX)数据处理器的框图。
具体实施方式
措词“示例性”在此被用来表示“用作示例、实例、或例示”。在此被描述为“示例性”的任何实施例都无需被理解为优选于或优于其它实施例。
这里所描述的数据传输和率选择技术可以用于具有多个传输信道的各种多信道通信系统。例如,这些技术可被用于多输入多输出(MIMO)系统、正交频分复用(OFDM)系统、利用OFDM的MIMO系统(被称为MIMO-OFDM系统)、时分复用(TDM)系统、频分复用(FDM)系统、码分复用(CDM)系统等。
MIMO系统采用发射机处的多个(T)发送天线和接收机处的多个(R)接收天线进行数据传输。由这T个发送天线和R个接收天线构成的MIMO信道可被分解为S个空间信道,其中S ≤min{T,R}。S个传输信道可由这S个空间信道构成。
OFDM系统将总系统带宽分割为多个(K)正交子带,它们也可被称为音、副载波、槽、以及频率信道。每个子带与可调制有数据的相应载波相关联。多达K 个的传输信道可由K个子带来构成。MIMO-OFDM系统具有用于这K个子带中每一个的S个空间信道。MIMO-OFDM系统中这K个子带的空间信道可形成高达S·K个传输信道。
一般而言,在空域、频域、时域、和/或码域可形成多个传输信道。例如,这多个传输信道可对应于MIMO系统中的不同空间信道,MIMO-OFDM系统中的不同宽带空间信道、OFDM或FDM系统中的不同子带、TDM系统中的不同时隙、CDM系统中的不同码信道等。传输信道还可被称为物理信道、话务信道、数据信道、并行信道、或某些其它术语。为了简明起见,以下描述部分是针对MIMO-OFDM系统的。
图1示出了根据一个实施例的多信道通信系统100中的发射机110和接收机150的框图。在接收机110处,TX数据处理器120接收话务/包数据,根据来自主控制器140的M个率处理(例如,编码、交织、以及码元映射)该话务数据,并生成数据码元的M个流,其中M>1。如这里所使用的,数据码元是话务数据的调制码元,导频码元是用于导频(即为发射机和接收机所已知的先验(priori)的数据)的调制码元,调制码元是对应于一种调制方案(例如,PSK或QAM)的信号星座中一点的复数值,发送码元是要在一个码元周期中在一个子带上从一个发送天线发送的码元,以及码元是一复数值。TX空间处理器130将M个数据码元流与导频码元多路复用,对数据和导频码元执行空间处理(例如,将在以下描述的本征操控、无操控、或空间扩展),并提供发送码元的T个流,其中T≥M。M个数据码元流针对M个数据流。这T个发送码元流被生成以使得在M个传输信道上发送这M个数据流。
发射机单元(TMTR)132处理这T个发送码元流(例如,对应于OFDM)并生成T个经调制的信号,它们从T个天线通过第一通信链路148被发送。通信链路148由于信道响应使经调制的信号失真,并由于附加白高斯噪声(AWGN)以及潜在可能的来自其它发射机的干扰进一步使经调制的信号退化。
在接收机150处,R个天线接收所发送的信号并将这R个接收到的信号提供给接收机单元(RCVR)160。接收机单元160调节这R个接收到的信号并将其数字化且以与发射机单元132所执行的处理互补的方式进一步处理这些样本。接收机单元160将接收到的导频码元提供给信道估计器/处理器172而将接收到的数据码元的R个流提供给接收(RX)空间处理器170。信道估计器172推导通信链路148的信道估计并将该信道估计提供给RX空间处理器170。RX空间处理器170用这 些信道估计(例如,使用如下所述的全CSI、CCMI、或MMSE技术)对R个接收到的数据码元流执行接收机空间处理,并提供M个检测到的码元流作为发射机110所发送的M个数据码元流的估计。RX数据处理器180根据所选的用于这些流的M个率来处理(例如,码元去映射、解交织、以及解码)这M个检测到的码元流,并提供经解码的数据作为发射机10发送的话务数据的估计。RX数据处理器180还可将解码结果(例如,每个包的状态)提供给率选择器/控制器182。
主控制器140和190分别控制发射机110和接收机150上的各种处理单元的操作。存储器单元142和192分别存储控制器140和190所用的数据和程序代码。
为了率选择/率控制,信道估计器172可处理接收到的导频码元以及潜在可能的检测到的数据码元并推导例如SNIR估计等传输信道的信道估计。率选择器182接收信道估计和解码结果,选择用于所有M个数据流的单个码率以及用于每个数据流的调制方案,并将这M个数据流的M个率提供给控制器190。每个数据流的率指示用于该数据流的码率以及调制方案。
控制器190将率信息(例如,M个率)以及可能的其它信息(例如,包被正确解码的确认(ACK))通过第二通信链路152发送到发射机110。发射机110处的控制器140接收率信息并将这M个率提供给TX数据处理器120。图1示出了由接收机150执行的率选择。一般而言,率选择可由接收机150、或发送机110、或两者执行。
在一个方面,为所有M个数据流选择了单个码率并可为每个数据流选择不同的调制方案。这M个数据流的M个率由此具有相同的码率并可具有相同或不同的调制方案。所有数据流使用单个码率可简化发射机处的编码和接收机上的解码,可简化率选择和/或减少率反馈的量,并可改善数据流的性能。
该系统可支持一组码率。每个码率可与一特定的编码方案和一特定量的冗余相关联。所支持的码率可与(1)不同的编码方案或(2)不同打孔率(puncture rate)的相同编码方案相关联。编码方案可包括卷积码、Turbo码、块码、一些其它码、或它们的组合。
表1示出了该系统所支持的率的示例性集合。每个被支持的率与实现所需性能级别所要求的特定数据率、特定码率、特定调制方案、以及特定最小SNIR相关联。数据率可以每调制码元的信息位数(bits/sym)为单位给出。所需的性能级别可通过目标PER来量化,例如非衰落AWGN信道为1%的PER。每种率所要求的SNIR可通过计算机仿真、实验测量、计算、和/或一些其它手段并针对特定系统设 计(例如,用于该率的特定码率、交织方案、以及调制方案)和AWGN信道来得到。
对于表1中所示的示例,支持1/4、1/2、3/4和7/8四种码率。BPSK、QPSK、16-QAM、64-QAM以及256-QAM的调制方案可被用于码率1/4、1/2、和3/4。QPSK、16-QAM、64QAM、以及256-QAM的调制方案可被用于码率7/8。因此,仅允许某些率(或码率和调制对)。一般而言,该系统可支持任何码率集,它可包括诸如码率7/12、5/8、5/6等未在表1中列出的码率。此外,该系统可允许可用于每种码率的任何调制方案集。表1还示出了某些率所要求的SNIR。
表1-率集
图2示出了根据一个实施例的使用单个码率和不同调制方案将多个(M)数据流发送到单个接收机的过程200。根据这些数据流的信道估计,例如SNIR估计选择用于所有M个数据流的单个码率和选择用于每个数据流的调制方案(块210)。如下所述,数据流的估计可依赖于被发送的数据流的数目、接收机所用的接收机空间处理技术等。也如以下所述,可以各种方式来实现率选择。
如图1所示,块210中的率选择可由接收机执行,且所选的率可被发送回发射机。或者,率选择可由发射机基于得到的来自/针对接收机的信息来执行。例如,在时分双工(TDD)系统中,从发射机往接收机的发送链路和从接收机到发射机的接收链路可被假定为彼此互逆。在该情形中,发射机可基于从接收机接收到的导 频来推导接收链路的信道估计,例如SNIR估计。然后发射机可根据对接收链路的估计以及指示两个链路的差异——例如SNIR差异的不对称参数来推导对发送链路的估计。发射机然后可根据对发送链路的估计来选择数据流的率。发射机和接收机也可联合执行率选择。
不论如何执行率选择,发射机获得所选的用于数据流的率。然后发射机根据所选的用于这些数据流的单个码率将所有数据流的话务数据编码(块212)。然后发射机根据所选的用于每个数据流的调制方案调制该流的经编码的数据(块214)。发射机进一步处理数据流(例如,用于空间传输、OFDM等)并在多个传输信道上发送这些数据流(块216)。
块210中率选择可在数据传输的开始、在每帧或时隙中、在指定时间等处被执行。只要为这些数据流选择了新的率就可调节该数据流的编码和调制。
不同数目的数据流(例如,一个、两个、三个、或多个数据流)可同时发送。这些数据流可能会彼此干扰,例如这些数据流在MIMO信道的多个空间信道上被发送。取决于信道条件和这些数据流之间干扰的量,可通过发送最大数目的数据流或可能地较少数据流来实现最高的总吞吐量。
图3示出了根据一个实施例的以每个流具有独立率的方式为系统中的数据流选择率的过程210a。过程210a是图2中块210的一个实施例。过程210a估计不同数目的数据流和不同的码率并且选择提供最高总吞吐量且被信道条件所支持的数据流的数目和码率。每个不同数目的数据流也被称为流组合或流假设。要估计的流组合的数目通常取决于可用于数据传输的传输信道的数目。例如,在具有S个空间信道的MIMO系统中,可估计1、2、...以及S个数据流的S个流组合。要估计的码率可以是例如表1中所示的码率1/4、1/2、3/4、以及7/8。
首先,用以存储当前最高总吞吐量的变量max_otp被初始化为0或max_otp=0(块310)。用以标示要发送的数据流的数目的变量M被初始化为1或M=1(也在块312)。
循环320从该循环的具有最少数目的数据流(或M=1)的第一次迭代开始,一次估计一个流组合。选择具有M个数据流的流组合进行估计(块322)。对于该流组合,在假定这M个数据流将在M个传输信道上被发送的情况下确定每个数据流的SNIR估计(块324)。SNIR估计在以下描述。
循环330从该循环的具有最低码率的第一次迭代开始,一次估计一个码率。选择一码率进行估计(块332)。对于当前码率,基于对M个数据流中每一个的 SNIR估计以及潜在可能的其它数据流的SNIR估计来选择该数据流的调制方案(块334)。例如,可对照当前码率所允许的每个调制方案要求的SNIR来比较每个数据流的SNIR估计,并且可将具有所要求的SNIR即小于或等于SNIR估计的SNIR的最高等级的调制方案选择用于该数据流。用于选择M个数据流的调制方案的其它方案在以下描述。
在选择了M个数据流的调制方案之后,基于针对该数据流和当前码率所需的调制方案确定每个数据流的数据率。然后将当前码率的总吞吐量计算为这M个数据流的数据率的和(块336)。如果如在块338中所确定的该总吞吐量大于当前max_otp,则用该总吞吐量更新max_otp,且保存当前流组合、当前码率、以及用于M个数据流的调制方案(块340)。
然后作出是否已经估计了所有码率的确定(块342)。如果答案为“否”,则该过程返回到块332以估计另一码率,例如下一更高的码率。否则,如果已经为当前流组合估计了所有码率,则作出是否已估计了所有流组合的确定(块344)。如果答案是“否”,则将变量M递增为M=M+1(块346),且过程返回到块322以估计另一流组合。否则,如果已经估计了所有流组合,则提供具有最高总吞吐量的流组合、码率、以及调制方案以供使用(块348)。
一给定流组合的多个码率可能具有相同的最高吞吐量。在该情形中,可选择这些多个码率当中最稳健的码率(即最低码率)。这可通过(1)从最低码率开始顺序地估计这多个码率以及(2)如图3中所示地仅在总吞吐量更高时才保存更高的码率。
多个流组合也可能具有相同的最高总吞吐量。在一个实施例中,当多个流组合具有相同的最高总吞吐量时选择具有最少数目的数据流的流组合。这可通过(1)从具有最少数据流的流组合开始顺序地估计这多个流组合以及(2)如图3中所示地仅在总吞吐量更高时才保存一流组合。
在另一实施例中,当多个流组合具有相同的最高总吞吐量时选择具有最大的总SNIR余量的流组合。每个数据流m的SNIR余量可被表示为:
SNIRmargin(m)=SNIRest(m)-SNIRreq(Rm) m=1,...,M,(式1)
其中,Rm(m)是为数据流m选择的率
SNIRest(m)是数据流m的SNIR估计;
SNIRreq(Rm)是率Rm所要求的SNIR;以及
SNIRmargin(m)是数据流m的SNIR余量
SNIRest(m)、SNIRreq(Rm)以及SNIRmargin(m)是以分贝(dB)为单位给出的。所有M个数据流的总SNIR余量可被表示为:
在另一实施例中,当多个流组合具有相同的最高总吞吐量时,如果一具有较多数据流的流组合的总SNIR余量超过其它具有较少数据流的流组合的总SNIR余量一预定量,该预定量可被标示为Δ余量,则选择该具有较多数据流的流组合。一般而言,当多个流组合具有相同的最高总吞吐量时,可选择具有较少数据流的流组合以降低这些流之间的串扰并简化发射机和接收机处的处理。然而,如果可实现改善的性能(更高的总吞吐量、更高的总SNIR余量等)则可选择具有较多数据流的流组合。
一般而言,当多个流组合具有相同的最高总吞吐量时,可选择任意一个、任意组合、或以上所述的所有实施例/准则(码率、流数目、SNIR余量等)来选择一个流组合。例如,如果多个流组合具有相同的最高吞吐量,则(1)可选择具有最小数目的流的流组合,则(2)可从这些选出的流组合当中选择具有最高SNIR余量且最少的流的流组合,则(3)可从这些选出的流组合当中选择具有最稳健的码率的流组合,等等,直到选出仅一个流组合。
在如图3所示的率选择的一个实施例中,调制方案是仅基于对每个数据流的SNIR估计来为每个数据流独立地选择的。该实施例可在例如该系统允许每个流进行独立率选择以及每个数据流被独立编码的情形(以下描述)下使用。为每个数据流选择具有正SNIR余量的调制方案确保了每个数据流可被可靠地接收。
在率选择的另一实施例中,余量共享地选择M个数据流的调制方案。该实施例可在例如该系统允许每个流进行独立率选择且数据流被联合编码的情形下(以下描述)使用。对于该实施例,首先如上所述地基于对每个数据流的SNIR估计选择用于该数据流的调制方案。如式(1)所示地确定每个数据流的SNIR余量。然后如式(2)所示地计算M个数据流的总SNIR余量。该总SNIR余量被分配到一个或多个数据流以允许在可能的情况下为这一个或多个数据流中的每一个选择更高等级的调制方案。
总SNIR余量的分配可以各种方式来执行。在用于余量共享的第一方案中,M个数据流基于它们的SNIR估计从最高到最低SNIR估计,以降序排序。然后经排 序的数据流从具有最高SNIR估计的数据流开始一次被选择一个以进行可能的晋级。用于所选的数据流的晋级SNIR被计算作为下一更高等级的调制方案(若有的话)要求的SNIR与为该数据流初始选择的调制方案所要求的SNIR之间的差异。如果该晋级SNIR小于或等于总SNIR余量,则该所选的数据流被晋级到下一更高等级的调制方案,且总SNIR余量减去该晋级SNIR。所选的数据流由此被分配了充分的SNIR余量以选择下一更高等级的调制方案。对每个剩余的数据流重复该相同处理直到无数据流可被晋级。
在用于余量共享的第二方案中,M个数据流基于它们的SNIR估计从最低到最高SNIR估计,以升序排序。经排序的数据流从具有最低SNIR估计的数据流开始被一次选择一个以进行可能的晋级。
在用于余量共享的第三方案中,M个数据流基于它们的差分SNIR从最低到最高的差分SNIR,以升序排序。数据流的差分SNIR是下一更高等级的调制方案所要求的SNIR与该数据流的SNIR估计之间的差。经排序的数据流从具有最低差分SNIR的数据流开始被一次选择一个以进行可能的晋级。该方案试图首先将需要最小量的SNIR余量就可晋级的数据流首先晋级,这可改善性能并允许更多数据流晋级。
在用于余量共享的第四方案中,M个数据流基于它们的晋级SNIR从最低到最高晋级SNIR,以升序排序。然后经排序的数据流从具有最低晋级SNIR的数据流开始被一次选择一个以进行可能的晋级。该方案试图首先将具有最小晋级SNIR的数据流晋级,这可以允许更多的数据流被晋级。
也可使用执行余量共享的其它方案且这也在本公开的范围之内。一般而言,可以各种顺序和方式将总SNIR余量分配到M个数据流。在一个实施例中,数据流可被晋级至高出一个以上等级的调制方案。例如,可基于总SNIR余量使所选的数据流尽可能地晋级。在另一实施例中,可被分配到一数据流的SNIR余量的量被限于一预定值SNIRallo_max之内。SNIRallo_max限制了任意数据流观测到的负SNIR余量的量并确保没有数据流将以其所需的SNIR太过高于对该数据流的SNIR估计的率发送。对于所有码率,SNIRallo_max可以是一固定值。或者,SNIRallo_max可以是作为码率的函数的可变值,以使得可将较小的SNIRallo_max用于不太稳健的码率(例如,码率7/8)而可将较大的SNIRallo_max用于更为稳健的码率(例如,码率1/2)。
系统可仅允许某些率组合,例如为了减少要发送回发射机的率信息的量。该系统所允许的率组合的集合常被称为向量量化率集。表2示出了其中发射机可发送 达4个数据流且可选择码率1/4、1/2以及3/4的系统的示例性矢量量化率集。对于每个率组合,表2中给出了总吞吐量(OTP)、要发送的数据流的数目(Num Str)、用于所有数据流的码率、用于每个数据流的调制方案。在表2中,“B”标示BPSK、“Q”标示QPSK、“16”标示16-QAM、“64”标示64-QAM、以及“256”标示256-QAM。作为示例,对于总吞吐量为19.5信息位/码元周期的率组合,发送了4个数据流、所有4个数据流使用码率3/4、数据流1和2使用256-QAM、数据流3使用64-QAM、而数据流4使用16-QAM。对于仅有一个数据流的率组合,可支持表1中所示率的全部或一子集。率集也可被定义成覆盖诸如码率7/12、5/8、5/6、7/8等其它码率。
表2-向量量化率集
图4示出了根据一个实施例的用向量量化率集选择系统中数据流的率的过程 210b。过程210b是图2中块210的另一实施例。过程210b基于该系统所支持的率集来估计不同的流组合和不同的码率,并选择提供最高总吞吐量且被信道条件所支持的率组合。
首先,将变量max_otp初始化为0,并将变量M初始化为1(块410)。对于循环420的第一次迭代,选择具有M个数据流的流组合进行估计(块422),且为这M个数据流中的每一个确定一SNIR估计(块424)。然后为可被选择用于当前流组合的每个码率执行一次循环430。
对于循环430的每次迭代,选择一码率以进行估计,例如从该当前流组合所被允许的最低码率开始(块432)。对于当前码率,基于对M个数据流的SNIR估计确定每个所允许的率组合的总SNIR余量(块434)。在M个数据流的情况下一给定率组合的总SNIR余量可如下确定。首先如式(1)所示地计算该率组合中每个数据流m的SNIR余量,其中SNIRreq(Rm)是由该率组合为该数据流指定的率所要求的SNIR。由于每个数据流在该率组合中的率是被指定的,所以每个数据流的SNIR余量可以是正数或负数。如果在该率组合中任何数据流的SNIR余量比一预定值(例如,-2dB)差,则丢弃该率组合。该预定值可以是一固定值或是作为码率的函数的可变值。例如,可将更负的负值(例如,-3dB)用于较稳健的码率(例如,码率1/2),且可将较少负的负值(例如,-1dB)用于不是很稳定的码率(例如,码率3/4)。然后如式(2)所示地将总SNIR余量计算为这M个数据流的SNIR余量的和。
具有最高总吞吐量和非负总SNIR余量的率组合被标识(块436)。如果多个率组合具有相同的总吞吐量,则选择这多个率组合当中具有最大总SNIR余量的率组合。如块438所确定地,如果该最高总吞吐量大于当前max_otp,则用该总吞吐量更新max_otp,并保存具有该最高总吞吐量的率组合(块440)。
然后作出是否已经估计了所有码率的确定(块422)。如果答案为“否”,则过程返回到块432以估计另一码率。否则,如果已经为当前流组合估计了所有码率,则作出是否已经估计了所有流组合的确定(块444)。如果答案为“否”,则将变量M递增为M=M+1(块446),且过程返回到块422以估计另一流组合。否则,如果已经估计了所有的流组合,则提供具有最高总吞吐量的率组合以供使用(块448)。
一给定流组合的多个率组合可能实现相同的最高总吞吐量且具有非负总SNIR余量。在该情形中,可选择具有最稳健的码率的率组合或具有最大总SNIR 余量的率组合。不同流组合的多个率组合可能实现相同的最高总吞吐量且具有非负总SNIR余量。在该情形中,可选择具有最少数据流的率组合、具有最大总SNIR余量的率组合、具有较多数据流但总SNIR余量高出Δ余量的率组合、或一些其它率组合。
在用向量量化率集在系统中选择率的另一实施例中,按照一指定数据流(例如,第一数据流)的所需SNIR将率集排序,例如从关于该指定数据流的最低所需SNIR到最高所需SNIR。SNIRmargin_min的最小SNIR余量可被强加于该指定数据流。根据上述方案并另外通过对照该最小SNIR余量比较该第一数据流的SNIR余量(即该第一数据流所需的SNIR减去其实际SNIR)可一次一个地估计该率集中的率组合。由于这些率组合是按照第一数据流的所需SNIR,从最低到最高地排序的,所以SNIR余量逐渐变差。因此,一旦遇到一率组合,其中该第一数据流的SNIR余量比该最小SNIR余量差,就可忽略剩余的率组合,因为对应这些率组合的该第一数据流将具有比该最小SNIR余量差的SNIR余量。该排序减少了被估计的率组合的数目。然后可使用上述的任意技术选择其第一数据流的SNIR好于SNIRmargin_min的这些率组合当中一个。率组合可按照任意数据流而不一定是第一数据流的所需SNIR来排序。此外,可在该率集中的所有率组合上或仅在每个码率的率组合上执行该排序。
在用向量量化率集在系统中选择率的另一实施例中,将每个率组合的总的所需SNIR计算为所有数据流在该率组合中被指定的率的所需SNIR的和。该率集中每个率组合的总的所需SNIR和总吞吐量可被存储在查找表中。为了率选择,将总SNIR估计计算为所有M个数据流的SNIR估计的和。然后选择具有最高总吞吐量且其总的所需SNIR小于或等于总SNIR估计的率组合。该实施例并不限制可被分配给每个数据流的SNIR余量的量。
以上描述了用于以每个流具有独立的率而系统具有向量量化率集的方式为系统执行率选择的示例性实施例。还可余量共享或余量不共享地以其它方式来执行率选择。
图5示出了根据一个实施例的发射机110处的TX数据处理器120的一个实施例的框图。TX数据处理器120包括编码器510、去多路复用器(Demux)520、用于M个数据流的M对交织器522和码元映射单元524。编码器510根据单个码率将话务数据编码并生成码位。该单个码率可包括卷积码、Turbo码、低密度奇偶校验(LDPC)码、循环冗余校验(CRC)码、块码等、或其组合。在一个实施例中, 编码器510实现率1/2的二进制卷积编码器,该编码器每个数据位生成两个码位。打孔(puncturing)单元(图5中未示出)然后打孔或删除实现该单个码率所需的若干码位。去多路复用器520接收来自编码器510的码位,将该码位去多路复用为M个流,并将这M个码位流提供给M个交织器522a到522m。
编码器510将每个话务数据包单独编码且可在一个或多个数据流上发送经编码的包。如果M个数据流的每一个是独立编码和调制的,则编码器510可工作M次以单独地编码这M个数据流的包,并且去多路复用器520将每个经编码的包提供给对应于一个数据流的一个交织器522。或者,为M个数据流使用M个单独的编码器(图5中未示出)。如果M个数据流是被联合编码但独立调制,则编码器510将每个包编码,且去多路复用器520将每个经编码的包分割为多个子包或块并将这些子包提供给不同的交织器522。在任何情形中,每个交织器522根据一交织方案交织或重新排序其流中的码位并将经过交织的位提供给相关联的码元映射单元524。每个码元映射单元524根据为其流所选的调制方案来映射经过交织的位并提供数据码元流。M个码元映射单元524a到524m提供M个数据码元流。
这里所述的数据传输和率选择技术可被用于各种系统和各类传输信道。频率选择性传输信道m的频率响应可由hm(k)给出,其中hm(k)是传输信道m的子带k的复信道增益,k=1,...,K。传输信道m的每个子带的接收到的SNIR为γm(k),可被表达为:
其中Pm(k)是传输信道m的子带k所用的发送功率而N0是接收机处的噪声方差。式(3)示出了接收到的SNIR的一个示例性表达式。一般而言,接收到的SNIR表达式可包括各个因素的项。例如,如下所述,在MIMO系统中,接收到的SNIR依赖于发射机和接收机所执行的空间处理。式(3)中接收到的SNIR以及以下描述中其它SNIR量都以dB为单位给出。
可在每个传输信道上发送一个数据流。可用各种方式推导出每个数据流/传输信道的SNIR估计。以下描述了推导SNIR估计的一个实施例。对于该实施例,每个数据流m的平均SNIR为γavg,m,被计算为:
每个数据流m的SNIR估计SNIRest(m)可被计算为:
SNIRest(m)=γavg,m-γbo,m, 式(6)
其中γbo,m是数据流m的补偿因子。补偿因子γbo,m可被用于解释接收到的SNIR在该数据流上的可变性并可被计算为平均SNIR和SNIR方差的函数,例如 其中Kbo是常数。补偿因子还可解释其它因素,例如该数据流的分集级数、用于该数据流的编码和交织方案、包大小等。
对于MIMO-OFDM系统,发射机与接收机之间的MIMO信道可被表征为一组K个信道响应矩阵H(k),k=1,...,K。每个信道响应矩阵H(k)具有R×T维且包含每个发送天线与每个接收天线之间对应于子带k的复增益。每个矩阵H(k)包括S个空间信道,其中S≤min{T,R}。MIMO信道可形成达到S个的宽带空间信道,其中每个宽带空间信道包括针对K个子带中的每一个的一个空间信道。例如,每个宽带空间信道可对应于一个发送天线的K个子带。作为另一示例,每个宽带空间信道可包括针对K个子带中每一个的一个本征模。每个宽带空间信道可被用作一传输信道。
对于MIMO和MIMO-OFDM系统,可由执行不同空间处理的发射机形成不同的传输信道。例如,发射机可执行本征操控、无操控、或空间扩展等。
对于本征操控,每个子带的信道响应矩阵H(k)可如下通过执行本征值分解来对角化:
R(k)=H H(k)·H(k)=E(k)·Λ(k)·E H(k), 式(7)
其中E(k)是本征向量的酉矩阵,Λ(k)是对角矩阵,而“H”标示共轭转置。发射机可在使用E(k)的每个子带k的S个正交空间信道(或本征模)上发送数据。每个子带k的对角矩阵Λ(k)包含H(k)的S个本征模的功率增益。每个子带的信道响应矩阵H(k)还可如下通过执行奇异值分解来对角化:
H(k)=U(k)·∑(k)·E H(k) 式(8)
其中U(k)是左奇异向量的酉矩阵,E(k)是右奇异向量(也是本征向量的矩阵)的酉矩阵,而∑(k)是H(k)的S个本征模的信道增益的对角矩阵。
对于无操控,发射机在没有任何空间处理的情况下发送数据,例如从每个发送天线发送一个数据流。对于空间扩展,发射机跨子带和/或码元周期地用不同的操控矩阵V(k)发送数据以使得数据传输遵守有效信道的集合体(ensemble)。
表3示出了由发射机对一个子带执行的本征操控(“es”)、无操控(“ns”)、以及空间扩展(“ss”),其中为了简明起见省略了子带索引k。s是具有要在一个码元周期中在一个子带上发送的达到S个数据码元的向量。x x是对应于模式x的具有要在一个码元周期中在一个子带上从T个发送天线发送的达到T个发送码元的向量,其中x可以是“es”、“ns”或“ss”。H x是对于模式x由数据向量s观测到的有效信道响应矩阵。
表3-发射机空间处理
本征操控 | 无操控 | 空间扩展 | |
空间处理 | x es=E·s | x ns=s | x ss=V·s |
有效信道 | H es=H·E | H ns=H | H ss=H·V |
接收机所得到的接收到的码元可被表示为:
r x=H·x x+n=H x ·s+n 式(9)
其中r x是对应模式x的接收到的码元的向量,而n是噪声向量,该噪声可被假定为具有方差 的AWGN。
表4示出了由接收机执行以得到检测到的码元 的空间处理, 是数据码元s的估计。全信道状态信息(full-CSI)技术可被用于本征操控。信道相关矩阵求逆(CCMI)和最小均方差(MMSE)技术可被用于本征操控、无操控、以及空间扩展。对于每种技术,接收机基于每个子带实际或有效信道响应矩阵来推导该子带的空间滤波器矩阵M。然后接收机用该空间滤波器矩阵对接收到的码元执行经空间匹配的滤波。
表4-接收机空间处理
表4还示出了对于这三种接收机空间处理技术,传输信道m的每个子带k的 接收到的SNIR。对于全CSI技术,λm(k)是Λ(k)的第m个对角元素。对于CCMI技术,rm(k)是 的第m个对角元素。对于MMSE技术,qm(k)是M mmse(k)·H x(k)的第m个对角元素。如表4中所指示的,每个传输信道接收到的SNIR依赖于MIMO信道响应、该接收机所用的接收机空间处理技术、以及分配给该传输信道的发送功率。总发送功率Ptotal对于发送机通常是固定的。分配给每个传输信道m的发送功率Pm的量可以取决于要发送的数据流的数目,例如Pm=Ptotal/M。每个传输信道的接收到的SNIR可被用于如以上针对式(3)到(6)所述地推导该传输信道的SNIR估计。
这里描述的数据传输和率选择技术可用各种手段来实现。例如,这些技术可以硬件、软件、或它们的组合来实现。对于硬件实现,用于处理要发送的数据的处理单元(例如,图1和5中的TX数据处理器120)可在被设计成执行这里所述的功能的一个或多个专用集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理器件(DSPD)、可编程逻辑器件(PLD)、现场可编程门阵列(FPGA)、处理器、控制器、微控制器、微处理器、电子器件、其它电子单元、或它们的组合内实现。用于率选择的处理单元(例如,图1中的率选择器/控制器182)也可在一个或多个ASIC、DSP、处理器等内实现。
对于软件实现,这里所述的技术可用执行这里所述的功能的模块(例如,进程、功能等)来实现。软件代码可被存储在存储器单元(例如,图1中的存储器单元142或192)并由处理器(例如,主控制器140或190)来执行。存储器单元可被实现在处理器内部或者在其可通过领域内已知的各种手段通信地耦合到该处理器的情形下可实现在处理器外部。
先前对所公开的实施例的描述被提供用以使得本领域的技术人员能够利用或使用本公开。对这些实施例的各种修改对于本领域的技术人员将是显而易见的,并这里所限定的普遍原则可应用到其它实施例而不会背离本发明的精神实质或范围。因此,本公开无意被限制于这里所示的实施例而是与依照在此所公开的原理和新颖特征的最宽的范围相符合。
Claims (24)
1.一种用于在通信系统中执行率选择的装置,其中所述率选择指为每个数据流选择恰当的编码和调制方案,包括:
处理器,用于确定要被发送给单个接收机的多个数据流的信道估计;以及
控制器,用于基于所述信道估计为所述多个数据流选择单个码率和多个调制方案,
其中所述信道估计包括信噪干扰比SNIR估计,并且所述控制器用于为多个流组合中的每一个确定多个码率中每一个的总吞吐量和总SNIR余量,并从所述多个码率和所述多个流组合当中选择具有最高总吞吐量和非负的总SNIR余量的码率和流组合,并提供所选的码率作为所述单个码率,其中每个流组合对应于不同数目的数据流,并且其中所述多个数据流对应于所选的流组合。
2.如权利要求1所述的装置,其特征在于,所述多个码率被所述系统支持。
3.如权利要求2所述的装置,其特征在于,所述多个码率中的每一个与一相应的调制方案集相关联,并且所述控制器用于从与所述单个码率相关联的所述调制方案集当中选择用于所述多个数据流中的每一个的调制方案。
4.如权利要求1所述的装置,其特征在于,所述控制器用于为所述多个数据流中的每一个选择能为所述数据流实现非负SNIR余量的调制方案。
5.如权利要求1所述的装置,其特征在于,所述信道估计包括信噪干扰比SNIR估计,并且所述控制器用于为所述多个数据流选择能使其中至少一个数据流具有负SNIR余量而所述多个数据流具有非负的总SNIR余量的所述多个调制方案。
6.如权利要求5所述的装置,其特征在于,所述控制器用于将所述至少一个数据流中的每一个的所述负SNIR余量限于一预定值之内。
7.如权利要求6所述的装置,其特征在于,所述预定值是由为所述多个数据流选择的所述单个码率决定的。
8.如权利要求6所述的装置,其特征在于,所述预定值是由为所述多个数据流选择的所述单个码率、所述多个数据流中的每一个的索引、为每个数据流选择的调制方案、被发送的数据流的数目、或其组合决定的。
9.如权利要求1所述的装置,其特征在于,所述控制器用于从具有所述最高总吞吐量和非负的总SNIR余量的多个码率当中选择最低码率。
10.如权利要求1所述的装置,其特征在于,所述控制器用于从具有所述最高总吞吐量和非负的总SNIR余量的多个流组合当中选择具有最少数据流的流组合。
11.如权利要求1所述的装置,其特征在于,其中所述单个码率和多个调制方案的组合称为率组合。
12.如权利要求11所述的装置,其特征在于,所述控制器用于确定多个率组合中每一个的总吞吐量和总SNIR余量、从所述多个率组合当中选择具有最高总吞吐量和非负的总SNIR余量的率组合、并从所选的率组合获得所述单个码率和所述多个调制方案,其中每个率组合与特定数目的数据流、用于所有所述数据流的特定码率、用于所述数据流中每一个的特定调制方案、以及所有所述数据流的特定总吞吐量相关联。
13.如权利要求12所述的装置,其特征在于,所述控制器用于从具有所述最高总吞吐量和非负的总SNIR余量的多个率组合当中选择具有最少数据流的率组合。
14.如权利要求12所述的装置,其特征在于,所述控制器用于从具有所述最高总吞吐量和非负的总SNIR余量的多个率组合当中选择具有最大总SNIR余量的率组合。
15.如权利要求12所述的装置,其特征在于,还包括:
存储器,配置成存储所述多个率组合的查找表,该表以在所述多个率组合的每一个率组合中一个数据流所需的SNIR决定的次序排列,并且所述控制器用于基于所述查找表选择所述率组合。
16.如权利要求1所述的装置,其特征在于,所述信道估计包括信噪干扰比SNIR估计,并且所述处理器用于确定所述多个数据流中每一个的多个频率子带的接收SNIR并基于每一数据流的接收SNIR确定该数据流的SNIR估计。
17.一种在通信系统中执行率选择的方法,其中所述率选择指为每个数据流选择恰当的编码和调制方案,包括:
确定要被发送给单个接收机的多个数据流的信道估计;以及
基于所述信道估计为所述多个数据流选择单个码率和多个调制方案,
其中所述信道估计包括信噪干扰比SNIR估计,并且所述选择单个码率和多个调制方案包括:
为多个流组合中的每一个确定多个码率中每一个的总吞吐量和总SNIR余量,其中每个流组合对应于不同数目的数据流,并且
从所述多个码率和所述多个流组合当中选择具有最高总吞吐量和非负的总SNIR余量的码率和流组合,其中所述单个码率就是所选的码率且所述多个数据流对应所选的流组合。
18.如权利要求17所述的方法,其特征在于,所述信道估计包括信噪干扰比SNIR估计,并且所述选择单个码率和多个调制方案包括:
为所述多个数据流中的每一个选择能使该数据流实现非负SNIR余量的调制方案。
19.如权利要求17所述的方法,其特征在于,所述信道估计包括信噪干扰比SNIR估计,并且所述选择单个码率和多个调制方案包括:
为所述多个数据流选择能使其中至少一个数据流具有负SNIR余量而所述多个数据流具有非负的总SNIR余量的所述多个调制方案。
20.如权利要求17所述的方法,其特征在于,所述单个码率和所述多个调制方案的组合称为率组合。
21.一种用于在通信系统中执行率选择的装置,其中所述率选择指为每个数据流选择恰当的编码和调制方案,包括:
用于确定要被发送给单个接收机的多个数据流的信道估计的装置;以及
用于基于所述信道估计为所述多个数据流选择单个码率和多个调制方案的装置,
其中所述信道估计包括信噪干扰比SNIR估计,并且所述用于选择单个码率和多个调制方案的装置包括:
用于为多个流组合中的每一个确定多个码率中每一个的总吞吐量和总SNIR余量的装置,其中每个流组合对应于不同数目的数据流,以及
用于从所述多个码率和所述多个流组合当中选择具有最高总吞吐量和非负总SNIR余量的码率和流组合的装置,其中所述单个码率是所选的码率且所述多个数据流对应于所选的流组合。
22.如权利要求21所述的装置,其特征在于,所述信道估计包括信噪干扰比SNIR估计,并且所述用于选择单个码率和多个调制方案的装置包括:
用于为所述多个数据流中的每一个选择能为该数据流实现非负SNIR余量的调制方案的装置。
23.如权利要求21所述的装置,其特征在于,所述信道估计包括信噪干扰比SNIR估计,并且所述用于选择单个码率和多个调制方案的装置包括:
用于为所述多个数据流选择能使其中至少一个数据流具有负SNIR余量而所述多个数据流具有非负的总SNIR余量的所述多个调制方案的装置。
24.如权利要求21所述的装置,其特征在于,所述单个码率和所述多个调制方案的组合称为率组合。
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TW200715745A (en) | 2007-04-16 |
AR053919A1 (es) | 2007-05-23 |
EP1891765A2 (en) | 2008-02-27 |
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US20060285605A1 (en) | 2006-12-21 |
JP2008547284A (ja) | 2008-12-25 |
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US8358714B2 (en) | 2013-01-22 |
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