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1、资料收集于网络,如有侵权请联系网站删除word 可编辑LTE 总结1.系统帧号(system frame number)SFN位长为 10bit,也就是取值从0-1023 循环。在 PBCH的 MIB 广播中只广播前8位,剩下的两位根据该帧在PBCH 40ms 周期窗口的位置确定,第一个10ms 帧为00,第二帧为 01,第三帧为 10,第四帧为 11。PBCH的 40ms 窗口手机可以通过盲检确定。2.codeword-layer-rank-antenna port codeword 是经过信道编码和速率适配以后的数据码流。在MIMO 系统中,可以同时发送多个码流,所以可以有1,2 甚至更多
2、的 codewords。但是在现在 LTE系统中,一个 TTI 最多只能同时接收与发送2 个 TB,所以最多 2 个 codewords;layer 和信道矩阵的“秩”(rank)是一一对应的,信道矩阵的秩是由收发天线数量的最小值决定的。例如4 发 2 收天线,那么 layer/rank=2;4 发 4 收天线,layer/rank=4;codeword 的数量和 layer 的数量可能不相等,所以需要一个layer mapper 把 codeword 流转换到 layer 上(串并转换);一根天线对应一个layer,经过 layer mapper 的数据再经过 precoding 矩阵对应到
3、不同的antenna port 发送。3.层映射(layer mapping)和预编码(precoding)层映射(layer mapping)和预编码(precoding)共同组成了 LTE的 MIMO 部分。其中层映射是把码字(codeword)映射到层(layer),预编码是把数据由层映射到天线端口,所以预编码又可以看做是天线端口映射。码字可以有 1 路也可以有两路,层可以有1,2,3,4 层,天线端口可以有1 个,2个和 4 个。当层数是 3 的时候,映射到 4 个天线端口,不存在3 个天线端口的情况。LTE中的预编码指代的是一个广义的precoding,泛指所有在 OFDM 之前层映
4、射之后所进行的将层映射到天线端口的操作,既包含传统的precoding(也就是空分复用,层数)1,可以是基于码本和非码本)也包含传统意义上的发送分集(SFBC、空时码之类的)。单就协议而言,precoding 包含 transmit diversity和 spatial multiplexing in an LTE sense,然后 spatial multiplexing in LTE 包含CDD(cyclic delay diversity)和 precoding(这个 precoding 是狭义的 precoding,就是给发送向量乘一个预编码矩阵的操作)。从原理上来讲,CDD 是属于分
5、集的(因为最后一个词是diversity),但是在 LTE里边没有单纯的CDD,而是将大时延 CDD 与狭义 precoding 相结合使用,所以也把CDD 包含在 spatial multiplexing的范畴里,这一点就和广义precoding 一样容易引起歧义。资料收集于网络,如有侵权请联系网站删除word 可编辑另一个概念是天线端口的概念,他与传统意义上的天线是不一样的。个人对天线端口的理解就是一种导频(图谱)。引用一篇参考文献里的表述如下“antenna port defined by the presence of an antenna port specific referenc
6、e signal”。而天线就是实际的天线。LTE最大支持基站 4 根天线,6 个天线端口(p=0,1,2,3,4,5),其中 p=0,1,2,3表示的是小区专用导频(cell-specific),分别对应 4 根发送天线,一般情况下,每个天线使用其中的一个导频图谱,也就是一个天线端口(我理解这也是为什么把导频叫做天线端口的原因)。p=4时表示的是 MBSFN 参考信号,与 MBSFN 传输相关联,具体MBSFN 是什么我也不知道.p=5表示的是用户终端专用导频,(UE-specific),是用来做beamforming 专用的。码字个数最多为 2(由接收器的天线数决定),对应的是一个TTI 中
7、产生的传输块的个数。由于码字数量和发送天线数量不一致,需要将码字流映射到不同的发送天线上,因此需要使用层与预编码。层映射与预编码实际上是“映射码字到发送天线”过程的两个的子过程。对于LTE而言,已定义的配置包括1x1,2 x 2,3 x 2 和 4 x 2几种收发形式,层是针对码字而言的,它可以准确的说明TB流所占的的天线资源,如在 22 的分集中,一个 TB流下发,该 TB流被映射到两层,在22的复用中,两个 TB流,那么每个 TB流的层数为 1,对于 32 的系统中,两个TB流下发,如果 TB1的层数目为 1,TB2的层数目为 2,则说明了各个TB流的情况。层是针对 TB流而言的,预编码是
8、针对天线口而言的。4.LTE 小区搜索过程UE使用小区搜索过程识别并获得小区下行同步,从而可以读取小区广播信息。此过程在初始接入和切换中都会用到。为了简化小区搜索过程,同步信道总是占用可用频谱的中间63 个子载波。不论小区分配了多少带宽,UE只需处理这 63 个子载波。UE 通过获取三个物理信号完成小区搜索。这三个信号是P-SCH信号、S-SCH信号和下行参考信号(导频)。一个同步信道由一个P-SCH信号和一个 S-SCH信号组成。同步信道每个帧发送两次。规范定义了 3 个 P-SCH信号,使用长度为62 的频域 Zadoff-Chu 序列。每个 P-SCH信号与物理层小区标识组内的一个物理层
9、小区标识对应。S-SCH信号有 168种组合,与 168 个物理层小区标识组对应。故在获得了 P-SCH和 S-SCH信号后UE可以确定当前小区标识(小区ID)。下行参考信号用于更精确的时间同步和频率同步。完成小区搜索后 UE可获得时间/频率同步,小区 ID 识别,CP长度检测.文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5
10、D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J
11、4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W1
12、0Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6
13、A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW
14、2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4
15、W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5M6A5D4T2文档编码:CW2J4N2M1Q1 HC4W10Q3C4W8 ZB5
16、M6A5D4T2资料收集于网络,如有侵权请联系网站删除word 可编辑5.MAC PDU(DL-SCH和 UL-SCH,除了透明 MAC和随机接入响应)MAC PDU 具有一个头部,零个或多个SDU,零个或多个控制单元,可能还有填充位。MAC 头部与 MACSDU都是可变长度的。一个 MAC PDU 头部,MAC PDU 头部可能有一个或多个子头部(subheader),每一个对应一个 SDU、控制信息单元(control element)或者填充位。一个普通 MAC PDU 子头部由六个域(R/R/E/LCID/F/L)组成,但是对于最后一个子头部、固定长度的MAC 控制信息单元以及填充位对
17、应的子头部,它们只包含四个域(R/R/E/LCID)图 3.3.2-1:R/R/E/LCID/F/L MAC 子头部文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档
18、编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3
19、R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档
20、编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3
21、R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档
22、编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3
23、R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4资料收集于网络,如有侵权请联系网站删除word 可编辑图 3.3.2-2:R/R/E/LCID MAC 子头部MAC PDU 子头部的顺序跟MAC SDU,MAC 控制信息单元以及填充部分出现的顺序是相应的。MAC 控制信息单元处于任何MAC
24、SDU 的前面。填充部分一般放在MAC PDU 的最后面,不过如果只有一个字节或者两个字节的填充部分时,它就放在MAC PDU 的最前面。填充部分的内容可以是任何值,因为接收方会直接忽略掉这里面的内容。对于一个 UE,每次一个传输块只能携带一个MAC PDU,当然它也告诉我们,如果有两个传输块时,可以携带两个PDU(这就是当使用空间复用的传输方式时)。图 3.3.2-3:具有头部、控制信息单元、SDUs 以及填充部分的MAC PDU 例子MAC 头部是可变长的,它包含以下参数:LCID:用于指示逻辑信道、控制消息类型或者填充域;L:指示 SDU或者控制消息的长度,除了最后一个子头以及固定长度的
25、控制消息对应的字头,每一个子头都有一个L 域,它的长度由F域指示;F:如果 SDU 或者控制消息的长度大于128byte,那么设置F=1,否则设为0,通过 F 的值,我们就可以知道对应的L 值的大小了,也就是知道这个内容(MAC SDU或者控制消息单元的长度了);E:指示 MAC 头部是否有多个域,当E=1 时,意味着接下来存在另外一组R/R/E/LCID 域,如果是0,那么接下来就是payload 了;R:预留比特位,设为“0”文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编
26、码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R
27、1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编
28、码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R
29、1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编
30、码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R
31、1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编
32、码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4资料收集于网络,如有侵权请联系网站删除word 可编辑6.SIB 在 mac 层用的是什么 LCID 传输?我们知道 SIB 的逻辑信道是 BCCH,传输信道是通过DL-SCH传的,SIB的 message 依靠 SI-RNTI(即 FFFF)加以区分,但是在传 sib 的时候 SRB都还没有建立,这时候当映射到 MAC层的时候,它的 LCID该怎么给那?答:BCCH的数据走的是 Transparent MAC,没有普通的 MAC PDU格式,所以也没有 LCID 7.LTE 随机接入为什么分成reamblesGroup
33、A 和 reamblesGroupB 请问将随机接入 Preamble 分成 A组和 B组的目的是什么?根据什么原则将64 个 Preaml 分成两个组呢?36.321 里面关于随机接入资源选择部分有这么一段描述:“If the uplink message containing the C-RNTI MAC control element or the uplink message including the CCCH SDU has not yet been transmitted,the UE shall:-if Random Access Preambles group B exist
34、s and if the potential message size(data available for transmission plus MAC header and,where required,MAC control elements)is greater than MESSAGE_SIZE_GROUP_A and if the pathloss is less than Pmax PREAMBLE_ INITIAL_RECEIVED_TARGET_POWER DELTA_PREAMBLE_MSG3 messagePowerOffsetGroupB,then:-select the
35、 Random Access Preambles group B;-else:-select the Random Access Preambles group A.”那么我就知道了,当UE的所在路损比较小,而发送的Msg3 消息比较大,大于MESSAGE_SIZE_GROUP_A,那么就会选择 groupB,当然前提是有 groupB 存在。因此 groupB与 A 的存在就是用来传送不同大小的Msg3。这个用在基于竞争的随机接入过程。8.空间复用和传输分集有什么区别?空间复用是为了提高传输数据数量;传输分级是为了提高传输数据质量;LTE的 MIMO 模式协议中共定义了7 种:1.单天线端口
36、,端口0;2.发射分集;文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1
37、H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6
38、 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1
39、H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6
40、 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1
41、H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6
42、 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4资料收集于网络,如有侵权请联系网站删除word 可编辑3.开环空间复用;4.闭环空间复用;5.多用户 MIMO(MU-MIMO);6.闭环 RANK=1 预编码;7.单天线端口,端口=5.共 7 种。分类的话可分为三大类:发射分集(1,2),空间复用(3,4,5)和波束赋形(BF)(6,7)。空间复用基于多码字的同时传输,即多个相互独
43、立的数据流通过映射到不同的层,再由不同的天线发送出去。码字数量与天线数量未必一致。(当然天线数量码字数量)。传输分集主要用于提高信号传输的可靠性,例如采用空时编码(STC)、循环延时分集(CDD)及天线切换分集等,LTE中用的比较多的是SFBC编码。也就是传输分集(2)用来提高信号传输的可靠性,主要是针对小区边缘用户,3,4 主要是针对小区中央的用户,提高峰值速率。MU-MIMO 是为了提高吞吐量,用于小区中的业务密集区。6,7 是用于增强小区覆盖,也是用于边缘用户。不过6 是针对 FDD,7 是针对 TDD而已。实际上 6 也可以归于 4 的一种特殊情况。模式 1 是单发单收:为的是支持传统
44、的小区模式。5kV!B5!/V6k 模式 2 是发射分集:目的是提高传输的有效性,所以当你的信道不好,或者是传输重要的控制信息的时候,一般都采用发射分集;空间复用分为两种,目的都是用于提高峰值速率。只用于PDSCH 模式 3 的主要模式是开环空间复用,原理基于大循环延迟分集,只上报RI、CQI(码本是轮询的,不上报PMI),更加稳健,用于高速场景(备用模式:RI=1时,发射分集)模式 4 的主要模式是闭环环空间复用,用于低速场景,需要上报RI,CQI,PMI,原理是基于 SVD分解(备用模式:RI=1 波束赋形)7Z;模式 5 是 MU-MIMO,大体思想是当两个用户的信道“正交”时,让它们使
45、用共同的信道资源,提高小区的吞吐量模式 6 与模式 7 都是波束赋形用途是提高接收信干噪比,增强小区的覆盖范围。文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码
46、:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1
47、P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码
48、:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1
49、P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码
50、:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1P7G6 ZK6K4T3D8F4文档编码:CZ1H9F8L4R7 HV7M3R1