ltepdschdecode

physical downlink shared channel decoding

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句法

[[cws,symbols] = ltePDSCHDecode(enb,chs,sym)

[[cws,symbols] = ltePDSCHDecode(enb,chs,sym,hest,noiseest)

[CWS，符号] = ltepdschdecode（enb，chs，rxgrid，hest，noiseest）

Description

[[cws，，，，symbols] = ltepdschdecode（恩布，，，，CHS，，，，sym）performs the inverse of physical downlink shared channel (PDSCH) processing on the matrix of complex modulated PDSCH symbols,sym，，，，using cell-wide settings structure,恩布，，，，and channel-specific configuration structure,CHS。The channel inverse processing includes inverting the channel precoding, layer demapping and codeword separation, soft demodulation, and descrambling. Inverting the precoding is accomplished by matrix pseudoinversion of the precoding matrices. It returns a cell array,cws，，，，of soft bit vectors, and a cell array,symbols，由实现物理下行链路共享通道（PDSCH）处理的倒数而产生的接收星座符号向量。有关更多信息，请参见TS 36.211[[1]，，，，Section 6.4 andltePDSCH。cwsis optionally scaled by channel state information (CSI) calculated during the equalization process.

[[cws，，，，symbols] = ltepdschdecode（恩布，，，，CHS，，，，sym，，，，hest，，，，最噪音）performs the decoding of the complex modulated PDSCH symbolssym使用范围范围的设置，恩布，，，，channel-specific configuration,CHS，，，，channel estimate,hest，，，，and the noise estimate,最噪音。

行为根据CHS。txscheme环境。为了”TxDiversity'transmission scheme, the precoding inversion is performed using an orthogonal space frequency block code (OSFBC) decoder. For the”SpatialMux'，，，，”CDD'，，，，and'多用户'传输方案，使用多输入的多输出（MIMO）最小均方根误差（MMSE）均衡器执行预编码反演，并在传输层和接收的层之间进行均等。为了'port0'，，，，'port5'，，，，'port7-8'，，，，”port8'，，，，and'port7-14'传输方案，使用MMSE均衡进行接收。输入渠道估计，hest，假定使用特定于UE的参考信号参考传输层，因此MMSE均衡将产生MMSE均衡层。

最噪音is an estimate of the noise power spectral density per RE on the received subframe. This estimate is provided by theltedlchanneLestimate功能。

[[cws，，，，symbols] = ltepdschdecode（恩布，，，，CHS，，，，rxgrid，，，，hest，，，，最噪音）接受完整收到的资源网格，rxgrid，，，，for one subframe, in place of thesyminput; the decoder will internally extract the PDSCH REs to obtain the complex modulated PDSCH symbols.rxgrid是3-Dm——- - - - - -n——- - - - - -nrxant一系列资源元素，其中mandnare the number of subcarriers and symbols for one subframe for cell-wide settings恩布andnrxantis the number of receive antennas. In this case,hest是4-Dm——- - - - - -n——- - - - - -nrxant——- - - - - -CellRefP数组在哪里mandnare the number of subcarriers and symbols for one subframe for cell-wide settings恩布，，，，nrxant接收天线的数量,CellRefPis the number of cell-specific reference signal antenna ports, given by恩布。CellRefP。hest处理以提取与PDSCH相关的通道估计值，在时间和频率位置与PDSCH RES相对应的频道估计值rxgrid。

Examples

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解码PDSCH符号

Open Live Script

Generate and decode PDSCH symbols.

初始化单元格参数结构恩布for RMC R.0.

恩布= lteRMCDL(”R.0'）；

populate a complex codeword matrix and generate modulated PDSCH symbols.

codeWordBits = randi（[0,1]，enb.pdsch.codedtrblksizes（1），1）;pdschsym = ltepdsch（enb，enb.pdsch，codeWordbits）;

Decode and plot the PDSCH symbols.

[rxCodeWords，rxsymbols] = ltepdschdecode（enb，enb.pdsch，pdschsym）;绘图（rxsymbols {：}，”k.'）title(”decoded PDSCH symbols'）

图包含一个轴对象。带有标题解码的PDSCH符号的轴对象包含一个类型行的对象。

Show size and first 5 elements of output codewords to be modulated,RXCWS，，，，and received symbols,symbols。

size_rxcodewords = size（rxcodewords {：}）

size_rxCodewords =1×2504 1

rxCodewords{1}(1:1:5)

ans =5×10.9487 0.9487 -0.3162 0.3162 0.3162

size_rxsymbols = size（rxsymbols {：}）

size_rxSymbols =1×2126 1

rxSymbols{1}(1:5)

ans =5×1复合物-0.9487-0.9487i -0.3162 + 0.9487I -0.3162-0.9487i -0.3162-0.3162i 0.9487-0.9487i-0.9487i

输入参数

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`恩布`-eNodeB cell-wide settings
structure

eNodeB cell-wide settings, specified as a structure containing these parameter fields.

参数字段	必需或可选	值	Description
`nCellID`	Required	整数从0到503	physical layer cell identity
`nsubframe`	Required	0 (default), nonnegative scalar integer	Subframe number
`CellRefP`	Required	1, 2, 4	细胞特异性参考信号（CRS）天线端口的数量
`双工模板`	可选的	`'fdd'`（（default),`'TDD'`	双链模式，指定为： `'fdd'`for Frequency Division Duplex or `'TDD'`for Time Division Duplex
以下参数取决于`双工模板`is set to`'TDD'`。
`tddconfig`	可选的	0, 1 (default), 2, 3, 4, 5, 6	Uplink–downlink configuration
`SSC`	可选的	0（默认），1、2、3、4、5、6、7、8、9	Special subframe configuration (SSC)
以下参数字段取决于`CHS。txscheme`is set to`”SpatialMux'`or`'多用户'`。
`nDLRB`	Required	Scalar integer from 6 to 110	下行链路资源块的数量。（（ $n_{RB}^{DL}$ ）
`CFI`	Required	1, 2, or 3 标量或CFI每个子帧变化，则为长度为10的向量（对应于帧）。	控制格式指示器（`CFI`）价值。在TDD模式下，`CFI`varies per subframe for the RMCs (`”R.0', 'R.5', 'R.6', 'R.6-27RB', 'R.12-9RB'`）
`循环序列`	可选的	`'普通的'`（（default),`”Extended'`	Cyclic prefix length

`CHS`-Channel-specific transmission configuration
structure

Channel-specific transmission configuration, specified as a structure that can contain the following parameter fields.

参数字段必需或可选值 Description

modulation

Required

”QPSK'，，，，”16QAM'，，，，'64Qam'，，，，”256QAM'，，，，'1024Qam'

调制类型,指定为一个特征向量,细胞array of character vectors, or string array. If blocks, each cell is associated with a transport block.

RNTI

Required

0 (default), scalar integer

Radio network temporary identifier (RNTI) value (16 bits)

txscheme

Required

'port0'，，，，”TxDiversity'，，，，”CDD'，，，，”SpatialMux'，，，，'多用户'，，，，'port5'，，，，'port7-8'，，，，”port8'，，，，'port7-14'。

pDSCH transmission scheme, specified as one of the following options.

传输方案	Description
`'port0'`	单天线端口，端口0
`”TxDiversity'`	传递多样性
`”CDD'`	Large delay cyclic delay diversity scheme
`”SpatialMux'`	闭环空间多路复用
`'多用户'`	multi-user MIMO
`'port5'`	Single-antenna port, port 5
`'port7-8'`	Single-antenna port, port 7, when`nLayers`= 1。Dual layer transmission, ports 7 and 8, when`nLayers`= 2。
`”port8'`	Single-antenna port, port 8
`'port7-14'`	Up to eight layer transmission, ports 7–14

nLayers

Required

整数从1到8

number of transmission layers.

CSI

可选的

”Off'（（default),'上'

FLAG提供了对加权软值的控制，这些软值用于确定在均衡过程中计算的通道状态信息（CSI）来确定输出值。如果'上'，，，，soft values are weighted by CSI.

以下参数取决于txschemeis set to”SpatialMux'or'多用户'。

pmISet

Required

Integer vector with element values from 0 to 15.

precoder matrix indication (PMI) set. It can contain either a single value, corresponding to single PMI mode, or multiple values, corresponding to multiple or subband PMI mode. The number of values depends on CellRefP, transmission layers and TxScheme. For more information about setting PMI parameters, seeltePMIInfo。

PRBSET

Required

整数柱向量或两列矩阵

Zero-based physical resource block (PRB) indices corresponding to the slot wise resource allocations for this PDSCH.PRBSETcan be assigned as:

a column vector, the resource allocation is the same in both slots of the subframe,
一个两列矩阵，此参数指定子帧中每个插槽的不同PRB，
a cell array of length 10 (corresponding to a frame, if the allocated physical resource blocks vary across subframes).

RMC的PRBSET每个子框架有所不同”R.25'（（TDD),'r.26'（（TDD),'r.27'（（TDD),'r.43'（（FDD),'r.44'，，，，'r.45'，，，，”R.48'，，，，”R.50'，，，，and”R.51'。

以下参数取决于txschemeis set to'port5'，，，，'port7-8'，，，，”port8'，，，，or'port7-14'。

w

可选的

数字矩阵，[[]（（default)

nLayers——- - - - - -pprecoding matrix for the wideband UE-specific beamforming of the PDSCH symbols.p是发射天线的数量。什么时候w未指定，不应用预编码。

`sym`-Complex modulated PDSCH symbols
数字矩阵

Complex modulated PDSCH symbols, specified as a numeric matrix of sizenRE——- - - - - -nrxant。nREis the number of QAM symbols per antenna assigned to the PDSCH andnrxantis the number of receive antennas.

Data Types:double
复杂的数字支持：万博1manbetxYes

`hest`-渠道估计
3-D numeric array|4-D数字阵列

渠道估计，，，，specified as a 3-D or 4-D numeric array. For the'port0'，，，，”TxDiversity'，，，，”SpatialMux'，，，，”CDD'，，，，and'多用户'传输方案，数组大小为nRE——- - - - - -nrxant——- - - - - -CellRefP，，，，wherenRE是每个天线分配给PDSCH的QAM符号的数量，nrxant接收天线的数量,CellRefP是由细胞特异性参考信号天线的数量enb.cellrefp。为了'port5'，，，，'port7-8'，，，，”port8'，，，，and'port7-14'传输方案，数组大小为nRE——- - - - - -nrxant——- - - - - -nLayers，，，，wherenLayersis the number of transmission layers given bychs.nlayers。

什么时候rxgrid提供，hest是一个大小的4-D数字阵列m——- - - - - -n——- - - - - -nrxant——- - - - - -CellRefP，，，，wheremandn是一个用于单元格设置的一个子帧的子载波和符号的数量，恩布，，，，nrxant接收天线的数量,CellRefPis the number of cell-specific reference signal antenna ports, given byenb.cellrefp。

Data Types:double

`最噪音`-噪声估计
numeric array

噪声估计of the noise power spectral density per RE on the received subframe, specified as a numeric array.

Data Types:double

`rxgrid`-全部收到的资源网格
numeric array

全部收到的资源网格，，，，specified as a 3-Dm——- - - - - -n——- - - - - -nrxant一系列资源元素，其中mandnare the number of subcarriers and symbols for one subframe for cell-wide settings恩布andnrxantis the number of receive antennas.

Data Types:double
复杂的数字支持：万博1manbetxYes

Output Arguments

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`cws`- 代码字或代码字
细胞array

Codeword or codewords, returned as a cell array containing one or two vectors of bit values corresponding to the one or two codewords to be modulated.

Data Types:double

`symbols`-Received constellation symbols
列向量的单元格数字

Received constellation symbols, returned as a cell array of complex double column vectors, resulting from performing the inverse of PDSCH processing.

Data Types:细胞

References

[1] 3GPP TS 36.211。“进化的通用地面无线电通道（E-UTRA）；物理渠道和调制。”第三代合伙项目；技术规格组无线电访问网络。URL：https://www.3gpp.org。

版本历史记录

Introduced in R2014a

也可以看看

ltePDSCH|ltePDSCHIndices|ltePDSCHPRBS|lteDLSCHDecode

ltepdschdecode

句法

Description

Examples

解码PDSCH符号

输入参数

恩布-eNodeB cell-wide settingsstructure

CHS-Channel-specific transmission configurationstructure

sym-Complex modulated PDSCH symbols数字矩阵

hest-渠道估计3-D numeric array|4-D数字阵列

最噪音-噪声估计numeric array

rxgrid-全部收到的资源网格numeric array

Output Arguments

cws- 代码字或代码字细胞array

symbols-Received constellation symbols列向量的单元格数字

References

版本历史记录

也可以看看

`恩布`-eNodeB cell-wide settings
structure

`CHS`-Channel-specific transmission configuration
structure

`sym`-Complex modulated PDSCH symbols
数字矩阵

`hest`-渠道估计
3-D numeric array|4-D数字阵列

`最噪音`-噪声估计
numeric array

`rxgrid`-全部收到的资源网格
numeric array

`cws`- 代码字或代码字
细胞array

`symbols`-Received constellation symbols
列向量的单元格数字