CN102342074B - 用于移动wimax系统的前同步码的传送的方法和设备 - Google Patents
用于移动wimax系统的前同步码的传送的方法和设备 Download PDFInfo
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Abstract
本文中概括描述了用于为移动WiMAX系统传送时序和同步信息的设备和方法的实施例。其它实施例可被描述并要求权利。
Description
技术领域
发明的领域一般涉及无线通信的领域,并且具体地说,涉及用于无线通信的信道的编码。
背景技术
移动微波接入全球互操作性(WiMAX)是用于固定和移动宽带网络以能够实现包括数据、流传送视频和话音等宽带数据服务的宽带无线技术。对严重干扰的健壮性和同步信道或同步前同步码(preamble)的快速检测对快速小区选择、系统时序和频率获取小区覆盖和小区边缘性能以及移动台的扫描等待时间至关重要。前同步码用于时序和载波同步,并且应具有足够数量的不同码以便相邻基站具有独特的前同步码。
移动WiMAX系统可根据诸如电气和电子工程师(IEEE)802.16e-2005标准“AirInterfaceforFixedandMobileBroadband WirelessAccessSystems”(2005年2月)及其演进IEEE802.16m标准“AdvancedAirInterface”等标准来操作。在802.16m中,有两个高级的前同步码:主高级前同步码(PA前同步码)和次高级前同步码(SA前同步码)。
附图说明
通过参照以下详细描述(在连同附图进行时),本发明的上述方面和许多伴随优点将变得更容易领会,因为其变得更好理解,其中,类似的引用标号贯穿各个视图表示类似的部分,除非另有指示:
图1示出根据一些实施例的无线网络;
图2示出根据各种实施例的用于处理前同步码序列的设备的框图;
图3是根据各种实施例的用于序列子块的分配的框图;
图4示出根据实施例的SA前同步码符号结构;
图5是根据实施例的用于子块的交织的多天线示例的框图;
图6是示出根据各种实施例的SA前同步码分配的框图;
图7是根据实施例的用于子块的交织的多天线示例的框图;以及
图8是根据本发明的一些实施例的流程图。
具体实施方式
本文中描述了为移动WiMAX系统传送前同步码的系统和方法的实施例。在下面的描述中,为提供本发明的实施例的详尽理解而陈述了许多特定的细节。然而,相关领域的技术人员将认识到,本发明可在没有一个或多个这些特定细节的情况下实践,或者通过其它方法、组件、材料等来实践。在其它实例中,公知的结构、材料或操作未详细示出或描述,以免混淆本发明的方面。
在此说明书各处对“一个实施例”或“一实施例”的引用指连同该实施例描述的特定特征、结构或特性包括在本发明的至少一个实施例中。因此,在说明书各处的各个位置出现的“在一个实施例”或“在一实施例中”短语不一定全部指相同实施例。此外,特定的特征、结构或特性可在一个或多个实施例中以任何适合的方式组合。
WiMAX传送特别是在802.16m中时在超帧中使用主高级前同步码(PA前同步码)和三个次高级前同步码(SA前同步码)。这些高级前同步码定位为超帧内每个帧的第一符号,其中,通常每超帧有四个帧。PA前同步码设计用于同步,并且定位为超帧内第二帧的第一符号以允许时序偏移和载频偏移估计与校正。每个SA前同步码设计成携带小区特定前同步码,并且定位为剩余三个帧的每个帧的第一符号。SA前同步码也可用于时序和载波同步的精细调谐。
PA前同步码可具有定义的序列长度和由某个函数所定义的副载 波的分配,所述函数描述如下:
PAPreambleCarrierSet=2·k+41
其中:PAPreambleCarrierSet指定分配到PA前同步码的所有副载波,并且k是从0到215的运转索引(running index)。
SA前同步码可用于检测SA前同步码索引。时序和频率偏移的精细调谐可使用SA前同步码索引来提供。也可估计最强和/或干扰前同步码的接收信号强度指示符信息(RSSI)或路径损耗。
现在转到图,图1示出根据本发明的一些实施例的无线通信网络100。无线通信网络100包括概括示为110、120和130的多个有线和/或无线网络。具体而言,无线通信网络100可包括无线城域网(WMAN)110、无线局域网(WLAN)120和无线个人区域网(WPAN)130。虽然图1示出三种无线网络,但无线通信系统100可包括另外或更少的无线通信网络和一个或多个有线网络。例如无线通信网络100可包括另外的WPAN、WLAN和/或WMAN。本文中所述的方法和设备在此方面中不受限制。
无线通信网络100还包括一个或多个平台或站(STA),包括基站、高级基站、订户站、移动台和/或高级移动STA(AMS),其概括示为通过接入多个无线网络和/或有线网络而能够进行异类无线通信的多无线电AMS 135和能够在任何时间接入单一无线网络或多个网络的单无线电AMS 140。例如,AMS 135和140可包括无线电子装置,如台式计算机、膝上型计算机、手持式计算机、平板计算机、蜂窝电话、寻呼器、音频和/或视频播放器(例如,MP3播放器或DVD播放器)、游戏装置、摄影机、数字摄像机、导航装置(例如,GPS装置)、无线外围设备(例如,打印机、扫描仪、耳机、键盘、鼠标等)、医疗装置(例如,心率监视器、血压监视器等)和/或其它适合的固定的、便携的或移动的电子装置。虽然图1示出七个AMS,但无线通信网络100可包括更多或更少的多无线电135和/或单无线电AMS 140。
STA可经无线链路使用多种调制技术来通信,如扩频调制(例如, 直序码分多址(DS-CDMA)和/或跳频码分多址(FH-CDMA))、时分复用(TDM)调制、频分复用(FDM)调制、正交频分复用(OFDM)调制、正交频分多址(OFDMA)、多载波调制(MDM)和/或其他适合的调制技术。
在一实施例中,STA可使用直序扩频(DSSS)调制和/或跳频扩频(FHSS)调制来实现WLAN 120(例如,电气和电子工程师协会(IEEE)所开发的802.11标准系列和/或这些标准的变型和演进)。例如,AMS135和/或140可经无线链路和与WLAN 120或接入点120相关联的装置通信。AP 125可在操作上耦合到路由器(未示出)。备选的是,AP 125和路由器可集成到单个装置(例如,无线路由器)中。
通过将射频信号划分成多个小的子信号,这些子信号又同时在不同频率传送,订户站、移动台或高级移动台(例如,多无线电AMS 135和单无线电AMS 140)可使用OFDM或OFDMA调制来传送大量的数字数据。具体而言,站可使用OFDM或OFDMA调制来实现WMAN110。多无线电AMS 135和单无线电AMS 140可根据IEEE为提供用于固定的、便携的和/或移动的宽带无线接入(BWA)网络而开发的802.16标准系列(例如,2004年发布的IEEE std.802.16)来操作,以便经无线链路与可以是高级基站(ABS)的基站105通信。
虽然一些上述示例在上面是相对于IEEE开发的标准来描述的,但本文中公开的方法和设备可轻松适用于其它专门兴趣小组和/或标准开发组织(例如,无线保真(Wi-Fi)联盟、微波接入全球互操作性(WiMAX)论坛、红外数据协会(IrDA)、第三代合作伙伴项目(3GPP)等)所开发的许多规范和/或标准。在一些实施例中,接入点125和基站105可根据特定的通信标准来通信,例如包括IEEE 802.11(a)、802.11(b)、802.11(g)、802.11(h)和/或802.11(n)的电气和电子工程师协会(IEEE)标准和/或用于WLAN的提议标准,但本发明的范围在此方面中不受限制,因为它们也可适合于根据其它技术和标准来传送和/或接收通信。在一些实施例中,接入点125和基站105可根据用于无线城域网(WMAN)的IEEE 802.16-2004、IEEE 802.16(e)和IEEE 802.16(m)标准(包括其变化和演进)来通信,但本发明的范围在此方面中不受限制,因为它们也可适合于根据其它技术和标准来传送和/或接收通信。对于有关IEEE 802.11和IEEE 802.16标准的更多信息,请参阅“IEEE Standards for Information Technology-Telecommunications and Information Exchange between Systems”-局域网-特定要求-第11部分“Wireless LAN Medium Access Control (MAC)and Physical Layer(PHY),ISO/IEC 8802-11:1999”,及城域网-特定要求-第16部分:“Air Interface for Fixed Broadband Wireless Access Systems”(2005年5月)及相关修订/版本。
WMAN 110和WLAN 120可经到以太网的连接、数字订户线(DSL)、电话线、同轴电缆和/或任何无线连接等在操作上耦合到共用公共或专用网络145,例如因特网、电话网络(例如,公共交换电话网(PSTN))、局域网(LAN)、电缆网和/或另一无线网络。在一个示例中,WLAN 120可经AP 125和/或为WPAN 130服务的WPAN STA 115在操作上耦合到共用公共或专用网络145。在另一示例中,WMAN 110可经基站105在操作上耦合到共用公共或专用网络145。
无线通信网络100可包括其它适合的无线通信网络。例如,无线通信网络100可包括无线广域网(WWAN)(未示出)。站可根据其它无线通信协议来操作以支持WWAN。具体而言,这些无线通信协议可基于模拟、数字和/或双模式通信系统技术,例如全球移动通信系统(GSM)技术、宽带码分多址(WCDMA)技术、通用分组无线电服务(GPRS)技术,增强数据GSM环境(EDGE)技术、通用移动电信系统(UMTS)技术、基于这些技术的标准、这些标准的变型和演进和/或其它适合的无线通信标准。
WPAN可在60GHz频带中操作以将实现大约几Gbps的吞吐量。目前多个标准化组织(电气和电子工程师协会(IEEE)802.15.3c、EEE802,11ad、无线HD SIG、ECMA TG20)正在致力于开发用于此类毫米波WPAN 130和WLAN 120网络的规范。虽然图1示出WMAN 110、 WLAN 120和WPAN 130,但无线通信网络100可包括WPAN、WLAN、WMAN和/或WWAN的其它组合。本文中所述的方法和设备在此方面中不受限制。
无线通信网络100可还包括其它WPAN、WLAN、WMAN和/或WWAN装置(未示出),例如网络接口装置和外围装置(例如,网络接口卡(NIC))、接入点(AP)、重新分发点、端点、网关、桥接器、集线器等,以实现蜂窝电话系统、卫星系统、个人通信系统(PCS)、双向无线电系统、单向寻呼器系统、双向寻呼器系统、个人计算机(PC)系统、个人数字助理(PDA)系统、个人计算附件(PCA)系统和/或任何其它适合的通信系统。虽然上面已描述了某些示例,但本公开的覆盖范围不限于此。
图2示出根据各种实施例的用于处理前同步码序列以便在图1的平台或站之间通信的设备的框图。在图2中,传送处理模块204提供编码信号232到调制模块206。编码信号232可包括由前同步码模块216提供的前同步码序列。另外,编码信号232可包括由信道编码模块218生成的处理的和映射的信息序列。这些序列例如可包括在传送分组内。
调制模块206接收编码信号232并在编码信号232上执行调制。这可一次一个符号来执行。在实施例中,前同步码序列可由单独的符号来表示。另外,调制模块206可执行进一步的操作,例如调制的数字信号的数模转换。图2示出这些操作产生发送到RF前端208的调制的信号234。
RF前端208在天线210、调制模块206与解调模块212之间交换信号。具体而言,RF前端208为无线传送准备调制的信号234。该信号又经天线210无线传送。另外,RF前端208为解调模块212和接收处理模块214准备经天线210接收的无线信号。RF前端208可包括各种组件(例如,电子器件),如放大器、滤波器、上变频器、下变频器、双工器(diplexer)和/或循环器。此外,天线210可以是单 个天线或多个天线。然而,实施例并不限于这些示例。
如图2所示,RF前端208可提供接收信号236到解调模块312。在接收后,解调模块212可执行各种操作。例如,解调模块212可执行接收信号236的模数转换,然后在接收信号236上执行解调。此类解调可涉及执行快速傅立叶变换(FFT)。这些操作产生解调的信号238,该信号又发送到接收处理模块214。
如图2中所示,接收处理模块214可包括前同步码检测模块220和信道解码模块222。信道解码模块222在解调的信号238的非前同步码部分上执行各种操作。例如,信道解码模块222可将解调的信号238的此类部分解映射成符号。此外,信道解码模块222可在这些符号上执行各种操作,例如解交织、FEC解码和/或解随机化。然而,实施例并不限于这些操作。作为此类操作的结果,接收处理模块214产生发送到主机模块202的信息序列240。
为了说明(并且不是限制)的目的,图2示出包括单个天线(210)的实现200。然而,实施例并不受此限制。任何数量的天线210均可被采用。通过此类天线,可与远程装置交换无线信号。
如对某些网络中的操作可能要求的一样,一些实现可仅包括前同步码传送特征,并且其它实现可仅包括前同步码检测特征。因此,仅传送前同步码的实现可忽略前同步码检测模块220。相反,仅接收前同步码的实现可忽略前同步码模块216。然而,实现可包括前同步码传送特征和前同步码检测特征两者。
此外,上面陈述了图2的元素可以在硬件、软件、固件或其任何组合中实现。因此,实现可包括执行有形存储媒体(例如,存储器)中存储的指令或控制逻辑的一个或多个处理器。另外,前同步码模块216可包括存储媒体以存储前同步码序列。然而,实施例不限于存储媒体的这些示范使用。
在无线通信网络100的选择信道中,码字可见到多个信道质量(q1、q2、…、qN)。在对信道质量的引用中,对于SA前同步码(NSAP) 的序列的长度在一实施例中对于512快速傅立叶变换(FFT)是144,对于1024-FFT是288,以及对于2048-FFT是576。当副载波索引256、512和1024分别为512-FFT、1024-FFT和2024-FFT被保留用于图3的DC 306时,副载波的分配可根据等式1来实现;
其中:
-SAPreambleCarrierSet指定分配到特定SA前同步码的的所有副载波;
-n是表示段ID的SA前同步码载波集合0、1和2的索引;
-k是对于每个FFT大小的运转索引0到NSAP-1;以及
不采用循环移位。
每个段在以下方式中使用出自三个可用载波集合中的载波集合所组成的SA前同步码:
段0使用SA前同步码载波集合0。
段1使用SA前同步码载波集合1。
段2使用SA前同步码载波集合2。
每个小区标识(ID)具有从0到767的整数值(IDCell)。在等式2中,IDCell由段索引和每段索引来定义;
IDcell=256·IdIdx (等式2)
其中:
-n是表示段ID的SA前同步码载波集合0、1和2的索引,
Idx=2mod(q,128)+(q/128),其中,q是0到255的运转索引。
SA前同步码序列被分区,并且每个分区(partition)专用于特定的基站(BS)类型,例如宏BS、毫微微BS等等。分区信息在扩展的系统信息中广播。
为了支持毫微微小区部署,如果毫微微小区BS被同步到宏小区BS,则毫微微BS可通过与重叠的宏小区BS所使用的不同的段或副 载波集合来传送其SA前同步码序列。重叠的宏小区BS的段信息可借助于通过一个或多个骨干网络与宏小区BS的通信或宏小区BS所传送的SA前同步码的活动扫描来获得。
对于512-FFT大小,SA前同步码序列(其在BPSK中可以是144比特序列或在QPSK中是288比特序列)被分成8个主要子块,即,A、B、C、D、E、F、G和H。每个子块的长度可以是使用二进制相移键控(BPSK)的18个比特或正交相移键控(QPSK)中的36个比特。每个段ID具有包括每段ID 8个子块的子块的不同序列,其中,最低有效比特(LSB)18个比特用于表示每个子块的二进制序列。二进制序列{0,1}被映射到实数{+1,-1}。如图3中所示,对于如元素310中所示的512-FFT大小,A、B、C、D、E、F、G和H使用差分编码来调制,并以升序按顺序映射到对应于段ID的循环移位SA前同步码副载波集合300上。对于更高的FFT大小,基本子块(A、B、C、D、E、F、G、H)以相同顺序重复。例如,在如图3的元素312中所示的1024-FFT大小中,E、F、G、H、A、B、C、D、E、F、G、H、A、B、C、D被调制并以升序按顺序映射到对应于段ID的循环移位SA前同步码副载波集合上。2048FFT大小的示例在元素314中示出。
在基于等式1应用副载波映射后,应用循环移位到超过三个连续副载波。每个子块具有共用偏移。每个子块的循环移位型式(pattern)是:
[2,1,0…,2,1,0…,2,1,0,2,1,0,DC,1,0,2,1,0,2…,1,0,2,…,1,0,2]其中,移位是循环右移位。每子块应用循环移位可避免与例如802.16e前同步码(其中,.16e前同步码无循环移位)的遗留前同步码的混淆。循环移位副载波集合提供了与例如IEEE 802.16e前同步码的遗留前同步码的小的交叉相关。因此,避免在遗留STA的遗留前同步码的混淆。
相反,在给定段号(0,1或2)时,.16e前同步码具有在全体副载波上的共用偏移。在一实施例中,配置用于802.16e通信的STA将检测.16e前同步码,而配置用于802.16m通信的STA将检测.16m前 同步码,包括配置用于能够使用.16e和.16m两者进行通信的混合模式通信的STA的一实施例。
对于512-FFT大小,子块(A、B、C、D、E、F、G、H)分别经历以下右循环移位(0、2、1、0、1、0、2、1)。图4示出频域中用于512-FFT的SA前同步码的符号结构,包括SA前同步码载波集合0402、SA前同步码载波集合1404和SA前同步码载波集合2406,指示每组54个载波集合。
在带有例如多输入多输出(MIMO)天线系统的多天线系统的一实施例中,SA前同步码块或子块在多个天线上如下交织。对于512-FFT大小,图5示出对于1、2、4和8个天线的SA前同步码分配。作为一示例,对于单天线装置,所有8个子块由天线传送,包括组502中的子块A、B、C和D和组504中的子块E、F、G和H。在双天线系统中每天线发送四个子块,在四天线系统中每天线发送两个子块,以及在八天线系统(未示出)中每天线发送一个子块。
图6示出对于1024-FFT大小的1、2、4和8个天线的SA前同步码分配。SA前同步码块或子块在天线上如下交织。对于单天线装置,16个子块由一个天线传送,包括组602中的子块E、F、G、H、A、B、C和D和组604中的子块E、F、G、H、A、B、C和D。使用交织的结构,在双天线系统中每天线发送八个子块,在四天线系统中每天线发送四个子块,以及在八天线系统(未示出)中每天线发送两个子块。
图7示出对于2048-FFT大小的1、2、4和8个天线的SA前同步码分配。类似于图6和图7中提供的示例,SA前同步码块或子块在天线上交织。对于单天线系统,通过一个天线来传送32个子块,在双天线系统中每天线传送16个子块,以及在四天线系统中每天线传送八个子块。
在一实施例中,让块表示八个连续的子块{E,F,G,H,A,B,C,D}。将前同步码块或子块指派到天线数量是2的幂的多个传送天线的算法能 够描述如下。设:
Nt:传送天线的数量
Nb:块的总数
Ns:子块的总数;Ns=8*Nb
Nbt:每天线块的数量;
Nst:每天线子块的数量;
如果(Nbt≥1):跨Nt个天线分发连续块;
对于给定天线,以时期Nt来重复块;以及
第(t+1)个天线的块位置=t+p*Nt,其中,t=0、1、…、Nt-1,p=0、1、…、Nbt-1
否则,如果(Nst=4):
则跨每2个连续天线来交织所述8个子块{E,F,G,H,A,B,C,D};
块[E,0,G,0,A,0,C,0]在块位置:floor(i/2)从天线i发送;
块[0,F,0,H,0,B,0,D]在块位置:floor((i+1)/2)从天线i+1发送,其中,i=0、2、4、…、Nt
否则,如果(Nst=2):
则跨每4个连续天线来交织所述8个子块{E,F,G,H,A,B,C,D};
块[E,0,0,0,A,0,0,0]在块位置:floor(i/4)从天线i发送;
块[0,0,G,0,0,0,C,0]在块位置:floor((i+1)/4)从天线i+1发送;
块[0,F,0,0,0,B,0,0]在块位置:floor((i+2)/4)从天线i+2发送;
块[0,0,0,H,0,0,0,D]在块位置:floor((i+3)/4)从天线i+3发送,其中,i=0、4、8、…、Nt
否则:
跨每8个连续天线来交织所述8个子块{E,F,G,H,A,B,C,D},即每天线发送1个子块;
块[E,0,0,0,0,0,0,0]在块位置:floor(i/8)从天线i发送;
块[0,F,0,0,0,0,0,0]在块位置:floor((i+1)/8)从天线i+1发送;
块[0,0,G,0,0,0,0,0]在块位置:floor((i+2)/8)从天线i+2发送;
块[0,0,0,H,0,0,0,0]在块位置:floor((i+3)/8)从天线i+3发送;
块[0,0,0,0,A,0,0,0]在块位置:floor((i+4)/8)从天线i+4发送;
块[0,0,0,0,0,B,0,0]在块位置:floor((i+5)/8)从天线i+5发送;
块[0,0,0,0,0,0,C,0]在块位置:floor((i+6)/8)从天线i+6发送;
块[0,0,0,0,0,0,0,D]在块位置:floor((i+7)/8)从天线i+7发送;其中,i=0、8、…、Nt
在每个时间帧,传送的结构跨传送天线而旋转。传送结构基于多个传送天线和块的数量从块形成。在实施例中,使用相位旋转跨传送天线来旋转传送结构。相位旋转可通过随机搜索来选择。
例如,我们考虑带有4个传送天线的512-FFT系统。在第f帧,前同步码结构[A,0,0,0,E,0,0,0]经第一天线发送,并且结构[0,0,0,D,0,0,0,H]经第四天线发送。因此,在第(f+1)帧,结构[0,0,0,D,0,0,0,H]经第一天线发送,而结构[A,0,0,0,E,0,0,0]经第二天线发送。
使用BPSK的不同FFT大小和天线数量的量值提升(boosting)级别如下:
天线/FFT | 512 | 1k | 2k |
1 | 1.5928 | 1.9516 | 1.4748 |
2 | 2.1841 | 2.5474 | 2.0800 |
4 | 2.8489 | 3.1047 | 3.0915 |
8 | 3.5523 | 4.0273 | 4.3691 |
BPSK SA前同步码提升级别
可应用备选调制技术,例如QPSK或8-相移键控(8PSK),导致特定于使用的调制技术的SA前同步码提升级别。
对于单天线BPSK实施例,通过1.5928的量值提升来传送SA前同步码。在第k个副载波提升的SA前同步码能够写为:
ck=1.5928·bk
其中,bk表示提升前的SA前同步码(+1或-1)。
在一实施例中,为任意数量的传送天线和任何带宽优化用于结构中每个子块的块覆盖序列{+1,-1}。二进制序列{0,1}映射到实数{+1,-1}。用于BPSK的每种情况的块覆盖序列是:
(FFT,天线数量)\段ID | 0 | 1 | 2 |
(512,1) | DE | DE | 0A |
(512,2) | 04 | C0 | 28 |
(512,4) | 20 | 00 | 90 |
(512,8) | 00 | 00 | 00 |
(1024,1) | 7CD6 | 7B2E | C66C |
(1024,2) | 1A1A | E2E2 | 0A0A |
(1024,4) | 1010 | 9090 | 2828 |
(1024,8) | 2020 | A0A0 | 8080 |
(2048,1) | 68E7E631 | FC8474DB | 69C337F3 |
(2048,2) | 2C210259 | C2042058 | 7D160BC4 |
(2048,4) | 6A5D2AF2 | 6476EDE6 | 56C6A39B |
(2048,8) | E659356A | 958047EE | 1AD81B52 |
BPSK SA前同步码块覆盖序列
可应用备选调制技术,例如QPSK或8-相移键控(8PSK),导致特定于使用的调制技术的SA前同步码块覆盖序列值。块覆盖序列可降低峰值对平均功率比(PAPR)而不影响检测性能。此外,诸如单无线电高级移动台140或多无线电高级移动台135等STA无需知道块序列的值,因为每子块进行差分编码和检测。
实施例可参照后面的图和所附示例进行进一步描述。一些图可包括逻辑流。虽然本文中呈现的此类图可包括特定的逻辑流,但能理解,逻辑流只提供可如何实现如本文中所述的一般功能性的示例。此外,给定逻辑流不必一定以呈现的顺序来执行,除非另有指示。另外,给 定逻辑流可通过硬件元件、由处理器执行的软件元件或其任何组合来实现。实施例在此上下文中不受限制。
图8是根据本发明的一些实施例的流程图。在元素1800中,从次高级(SA)前同步码来形成多个载波集合,其中,每个载波集合包括子块。在元素810中确定用于传送载波集合的非重叠型式,并且在元素820中使用OFDMA技术通过多个天线来传送载波集合。在一实施例中,形成三个SA前同步码载波集合,但在备选实施例中可形成更少或另外的载波集合。此外,用于传送载波集合的非重叠型式可提供最小化的峰值对平均功率比(PAPR)。
本发明所示实施例的上面描述(包括摘要中所描述的)并非旨在是穷举的或将本发明限制到公开的精确形式。虽然为了说明的目的而在本文描述了本发明的特定实施例和示例,但各种等同的修改在本发明的范围内是可能的,如相关领域的技术人员将认识到的。
本发明的实施例可用作或支持软件程序,所述软件程序在某一形式的处理核(例如计算机的处理器)上执行,或者以其它方式在机器可读媒体上或内实现或实行。本发明可提供为可计算机程序产品或软件,所述程序产品或软件可包括其上存储有指令的有形机器可读媒体,所述指令可用于对计算机(或其它电子装置)编程以执行根据本发明的过程。此类软件能存储在系统中的存储器内。类似地,代码能够经网络或借助于其它计算机可读媒体来分发。因此,机器可读媒体可包括用于以机器(例如,计算机)可读形式来存储或传送信息的任何机制,但不限于软盘、光盘、压缩盘、只读存储器(CD-ROM)、以及磁光盘、只读存储器(ROM)、随机存取存储器(RAM)、可擦除可编程只读存储器(EPROM)、电可擦除可编程只读存储器(EEPROM)、磁卡或光卡、闪速存储器、通过因特网、电、光、声或其它形式的传播信号(例如,载波、红外信号、数字信号等)的传送或诸如此类。
相应地,计算机可读媒体包括适合用于以机器(例如计算机)可读形式来存储或传送电子指令或信息的任何类型的媒体/机器可读媒 体。另外,本发明也可作为计算机程序产品来下载。因此,程序可从远程计算机(例如,服务器)传输到请求计算机(例如,客户端)。程序的传输可经通信链路(例如调制解调器、网络连接或诸如此类),借助于载波或其它传播媒体中实施的电、光、声或其它形式的数据信号。
术语“无线”及其衍生词可用于描述通过使用经过非固态媒体的调制的电磁辐射来传递数据的电路、装置、系统、方法、技术、通信信道等。该术语不暗示相关联的装置不包含任何导线,但在一些实施例中,它们可能不包含。术语“移动无线装置”用于描述它正在通信时可在移动中的无线装置。
鉴于上述详细描述,能对本发明进行这些修改。随附权利要求中使用的术语不应解释为将本发明限制到说明书和附图中公开的特定实施例。相反,本发明的范围要由随附权利要求来完全确定,权利要求要根据权利要求解释的确立原则来解释。
Claims (17)
1.一种用于前同步码传送的方法,包括:
处理包含多个有序帧的超帧以用于使用正交频分多址(OFDMA)技术的无线通信网络中的传送,其中所述多个有序帧的帧包括划分成多个子块的次高级前同步码(SA前同步码)序列,以及其中所述多个子块以升序有序地映射到循环移位的SA前同步码副载波集合上。
2.如权利要求1所述的方法,还包括在多个天线上交织所述多个子块。
3.如权利要求1所述的方法,其中超帧在高级基站(ABS)中被处理。
4.如权利要求1所述的方法,还包括应用差分编码到所述子块。
5.如权利要求4所述的方法,其中所述循环移位的SA前同步码对应于段ID。
6.一种用于通过多个天线来传送次高级前同步码(SA前同步码)的方法,包括:
形成所述SA前同步码的多个载波集合,其中每个载波集合包括子块;
确定用于传送所述载波集合的非重叠型式;以及
使用正交频分多址(OFDMA)技术通过所述多个天线来传送所述载波集合,
其中所述子块以升序有序地映射到循环移位的SA前同步码副载波集合上。
7.如权利要求6所述的方法,其中用于传送所述载波集合的所述非重叠型式最小化峰值对平均功率比(PAPR)。
8.如权利要求6所述的方法,还包括形成三个SA前同步码载波集合。
9.一种用于前同步码传送的设备,包括:
多个天线;
存储器模块;以及
处理器,配置用于形成次高级前同步码(SA前同步码)的子块的子集,确定用于传送子块的所述子集的非重叠型式;以及使用正交频分多址(OFDMA)技术通过所述多个天线来传送子块的所述子集。
10.如权利要求9所述的设备,其中所述设备是高级基站(ABS)或高级移动台(AMS)。
11.如权利要求10所述的设备,还包括在所述多个天线上交织子块的所述子集以降低峰值对平均功率比(PAPR)。
12.一种用于前同步码传送的装置,包括:
形成用于SA前同步码的子块的序列的部件;
将段ID与子块的所述序列相关联的部件;
调制所述子块的部件;以及
用于通过以升序将所述子块有序地映射到对应于所述段ID的循环移位的副载波集合上来应用副载波映射的部件。
13.如权利要求12所述的装置,还包括在应用所述副载波映射后应用所述循环移位到超过三个连续的副载波的部件。
14.一种用于前同步码传送的方法,用于生成次高级前同步码(SA前同步码),所述方法包括:
形成用于所述SA前同步码的子块的序列;
将段ID与子块的所述序列相关联;
调制所述子块;以及
通过将所述子块按照升序有序地映射到对应于所述段ID的循环移位的副载波集合上来应用副载波映射以便于通过天线进行传送。
15.如权利要求14所述的方法,还包括在应用所述副载波映射后应用所述循环移位到超过三个连续的副载波。
16.如权利要求15所述的方法,其中所述循环移位是循环右移位。
17.如权利要求16所述的方法,其中循环移位所述副载波集合减少与遗留的前同步码的交叉相关。
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