天线端口

更新时间:2023-08-02 23:10:35 阅读：评论：0

天线端口（antenna port）

在LTE中，就有天线端口的定义和使用，而且还分上下行进行的定义，上行的定义如下：

An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. There is one resource grid per antenna port. The antenna ports ud for transmission of a physical channel or signal depends on the number of antenna ports configured for the physical channel or signal as shown in Table 5.2.1-1. The index is ud throughout clau 5 when a quential numbering of the antenna ports is necessary.

Table 5.2.1-1: Antenna ports ud for different physical channels and signals

Physical channel or signal	Index	Antenna port number as a function of the number of antenna ports configured for the respective physical channel/signal
Physical channel or signal	Index	1	2	4
PUSCH	0	10	20	40
	1	-	21	41课堂观察法
	2	-	-	42
	3	-	-	43
SRS	0	10	20	40
	1	-	21	41
	2	-	-	42
	3	-	-	43
PUCCH, SPUCCH	0	100	200	-
PUCCH, SPUCCH	1	-	201	-

而对于下行来说，协议的定义如下：

An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. For MBSFN reference signals, positioning reference signals, UE-specific reference signals associated with PDSCH, demodulation reference signals associated with SPDCCH, and demodulation reference signals associated with EPDCCH, there are limits given below within which the channel can be inferred from one symbol to another symbol on the same antenna port. There is one resource grid per antenna port.

Reference Signal Type	Associated Antenna Ports
Cell-Specific Reference Signal	p = 0, p ∈ {0,1}, p ∈ {0,1,2,3}
MBSFN	p = 4
UE-Specific Reference Signal	p = 5, p = 6, p = 7, p = 8 , one/veral of p ∈ {7,8,9,10,11,12,13,14}
DMRS for EPDCCH	p ∈ {107,108,109,110} 印度多少人
Positioning Reference Signal	p = 6
CSI Reference signal	P = 15, p = 15,16, p = 15,16,17,18, p = 15,16,17,18,19,20,2122, p = 15,16,17,18,19,20,21,22,23,24,25,26, p = 15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30

天线端口是逻辑概念，而不是物理概念；

每个天线端口代表一个特定的信道模型；

通过特定天线端口传输的信道可以使用端口分配的参考信号来完成（这就是为什么每个天线端口都有自己的参考信号）。

如下图所示，首先在预编码过程中引入天线端口，每个天线端口将生成自己的资源网格。

也就是说code words在层映射后，数据需要组合能后在预编码环节进行再分配到每个天线端口，在B点是数据和RE资源进行映射，也是需要通过不同的天线端口进行。C点就是典

型的资源映射情况，在不同的天线端口有不同资源块，D点出去就是逻辑端口和物理天线之间的对应了，比如8个中药半夏物理天线端口分为两组，然后每组形成一个逻辑天线端口。

C点的例子如下：

以上是4X4 MIMO，TM3或TM4

在NR中，天线端口的定义如下：

An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed.

For DM-RS associated with a PDSCH, the channel over which a PDSCH symbol on one antenna port is conveyed can be inferred from the channel over which a DM-RS symbol on the same antenna port is conveyed only if the two symbols are within the same resource as the scheduled PDSCH, in the same slot, and in the same PRG as described in clau 5.1.2.3 of [ TS 38.214].

Two antenna ports are said to be quasi co-located if the large-scale properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed. The large-scale properties include one or more of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters.

各类物理信道、信号的天线端口对应如下：

Channel/Signal	Antenna Ports
PDSCH	Antenna ports starting with 1000
PDCCH	Antenna ports starting with 2000
CSI-RS	Antenna ports starting with 3000
SS/PBCH	Antenna ports starting with 4000 邱军
PUSCH/DMRS	Antenna ports starting with 0
SRS	Antenna ports starting with 1000
PUCCH	Antenna ports starting with 2000
PRACH	Antenna port 4000

在预编码处理中，DMRS映射中值如下：

比较好的护肤品

DM-RS antenna port
	DM-RS Configuration type 1				DM-RS Configuration type 2
	resourceElementOfft				resourceElementOfft
	00	01	10	11	00	01	10	11
0	0	2	6	8	0	1	6	7
1	2	4	8	10	1	6	7	0
搓澡工玩警察鸟的故事2	试管移植放入过程1	3	7	9	2	3	8	9
3	3	5	9	11	3	8	9	2
4	-	-	-	-	4	5鲁滨逊漂流记主要内容50字	10	11
5	-	-	-	-	5	10	11	4

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标签：端口天线映射信道物理定义过程

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