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wlanVHTConfig

配置VHT传输

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描述

ThewlanVHTConfigobject is a configuration object for the WLAN very high throughput (VHT) packet format.

Creation

Syntax

cfgvht = wlanvhtconfig
cfgvht = wlanvhtconfig(Name,Value)

描述

example

cfgVHT= wlanVHTConfigcreates a configuration object that initializes parameters for an IEEE®802.11™ VHTPPDU。

example

cfgVHT= wlanvhtconfig（名称，值）sets properties using one or more name-value pairs. Enclose each property name in quotation marks. For example,wlanVHTConfig('GuardInterval','Short')specifies a 400-nanosecond guard interval (cyclic prefix) duration.

在运行时，调用函数验证了与该函数操作相关的属性的对象设置。

Properties

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PPDU传输的通道带宽，指定为以下值之一：

  • 'CBW20'– Channel bandwidth of 20 MHz

  • 'CBW40'- 40 MHz的频道带宽

  • 'CBW80'– Channel bandwidth of 80 MHz

  • 'CBW160'- 160 MHz的频道带宽

数据类型：char|string

用户数, specified as1,2,3, or4。

数据类型：双倍的

用户位置，指定为1乘NumUsers向量的整数in the interval [0, 3] in strictly increasing order.

例子：[0 2 3]specifies the positions for three users. The first user occupies position 0, the second user occupies position 2, and the third user occupies position 3.

Dependencies

仅当您指定NumUsersproperty as a value greater than1。

数据类型：双倍的

发射天线的数量, specified as a positive integer.

数据类型：双倍的

纳米秒中的循环移位值，用于波形前VHT场的附加传输天线。前八个天线使用表21-10中指定的循环偏移值[1]。剩余的L天线使用您在此属性中指定的值，其中L=Num Transmitantennas- 8。将此属性指定为以下值之一：

  • 间隔[–200，0]中的整数 -wlanVHTConfig对象为每个循环移动值Ladditional antennas.

  • 长度的行矢量L间隔中的整数[–200，0] -wlanVHTConfig对象使用kth element as the cyclic shift value for the(k+ 8）TH传输天线。

    Note

    If you specify this property as a row vector of length greater thanL,wlanVHTConfigobject uses only the firstLelements. For example, if you set theNum Transmitantennasproperty to16,wlanVHTConfigobject uses only the firstL= 16 - 8 = 8elements of this vector.

Dependencies

要启用此属性，请设置Num Transmitantennasproperty to a value greater than8。

数据类型：双倍的

传输中的时空流数量，指定为以下值之一：

  • An integer in the interval [1, 8], applicable when theNumUsers属性是1

  • A 1-by-NumUsers向量的整数in the interval [1, 4], applicable when theNumUsers财产大于1。

例子：[1 3 2]是三用户传输中每个用户的时空流数。

Note

The sum of the elements of this property must not exceed eight.

数据类型：双倍的

空间映射方案，指定为'Direct','Hadamard','Fourier', or'Custom'。

Dependencies

The default value,'Direct', applies only when you set theNum Transmitantennasandnumspacetimestreams属性为相同的值。

数据类型：char|string

Spatial mapping matrix, specified as one of these values:

  • A complex-valued scalar. This value applies to all the subcarriers.

  • A complex-valued matrix of sizeNSTS-经过-NT， 在哪里:

    • NSTSis the number of space-time streams;

    • NTis the number of transmit antennas.

    在这种情况下，空间映射矩阵适用于所有子载波。

  • A complex-valued 3-D array of sizeNST-经过-NSTS-经过-NT， 在哪里NSTis the number of occupied subcarriers. The value ofNSTis the number of occupied subcarriers. TheChannelBandwidthproperty determines the value ofNST。在这种情况下，每个被占领的子载波都有自己的空间映射矩阵。

    This table shows theChannelBandwidth设置和相应的NST:

    ChannelBandwidth Number of Occupied Subcarriers,NST 数据子载波的数量 Number of Pilot Subcarriers
    'CBW20' 56 52 4
    'CBW40' 114 108 6
    'CBW80' 242 234 8
    'CBW160'

    484

    		 468 16

Use this property to rotate and scale the output vector of the constellation mapper. The spatial mapping matrix is used for beamforming and mixing space-time streams over the transmit antennas. For more information, see Section 19.3.11.11.2 of[1]。The calling function normalizes the spatial mapping matrix for each subcarrier.

例子：[0.5 0.3;0.4 0.4;0.5 0.8]represents a spatial mapping matrix with three space-time streams and two transmit antennas.

Dependencies

This property applies only when you set theSpatialMappingproperty to'Custom'。

数据类型：双倍的
Complex Number Support:Yes

启用波束形成, specified as a numeric or logical value of1(true) or0(false). To apply a beamforming steering matrix, set this property to1(true). TheSpatialMappingMatrixproperty specifies the beamforming steering matrix.

Dependencies

This property applies only when theNumUsers属性是set to1and theSpatialMapping属性是set to'Custom'。

数据类型：logical

Enable space-time block coding (STBC) of the PPDU data field, specified as a numeric or logical value of1(true) or0(false). STBC transmits multiple copies of the data stream across assigned antennas.

  • When you set this property to0(false), STBC is not applied to the data field. The number of space-time streams is equal to the number of spatial streams.

  • When you set this property to1(true), STBC is applied to the data field. The number of space-time streams is twice the number of spatial streams.

For more information, see Section 22.3.10.9.4 of

Dependencies

This property applies only when theNumUsers属性是1。

数据类型：logical

用于传输的调制和编码方案，指定为以下值之一：

  • an integer in the interval [0, 9], applicable when theNumUsers属性是1

  • a 1-by-NumUsers向量的整数in the interval [0, 9], applicable when theNumUsers财产大于1。

This table shows the modulation type and coding rate for each valid value ofMCS:

MCS 调制 Coding Rate
0 Binary phase-shift keying (BPSK) 1/2
1 正交相移键合（qpsk） 1/2
2 QPSK 3/4
3 16-point quadrature amplitude modulation (16-QAM) 1/2
4 16-QAM 3/4
5 64-qam 2/3
6 64-qam 3/4
7 64-qam 5/6
8 256-qam 3/4
9 256-qam 5/6

数据类型：双倍的

Forward-error-correction (FEC) coding type for the VHT-Data field, specified as one of these values:

  • 'LDPC'- 低密度平价检查（LDPC）编码适用于传输中的所有用户

  • 'BCC'– binary convolutional coding (BCC) applies to all users in the transmission

  • A 1-by-NumUserscell array containing the values'LDPC'and'BCC',那里的k元素指定用户的频道编码k

有关更多信息，请参见第21.3.10.5节[1]。

数据类型：char|cell|string

Aggregated MPDU (A-MPDU) pre-end-of-frame (pre-EOF) padding (APEP) length, in bytes.

  • 当。。。的时候NumUsers属性是1，将此属性指定为间隔[0，2中的非负整数20- 1]。

  • 当。。。的时候NumUsers属性是一个值1，将此属性指定为1乘NumUsers向量的整数in the interval [0, 220- 1]。

  • 对于零数据包（NDP），将此属性设置为0。

The object uses this property to determine the number of OFDM symbols in the data field. For more information, see Table 21-1 of[1]。

Note

该对象仅支持汇总的数据传金宝app输。

数据类型：双倍的

此属性仅阅读。

Physical layer convergence procedure (PLCP) service data unit (PSDU) length, in bytes, specified as one of these values:

  • 间隔中的整数[0，220- 1], applicable when theNumUsers属性是1。A value of0corresponds to a null data packet (NDP).

  • 整数的向量在间隔[0，220- 1], applicable when theNumUsers财产大于1。

  • An empty array, applicable when this property is undefined, for example, when the set of property values is invalid.

The object calculates this property based on the value of theapeplengthproperty and other coding related properties. For more information, see section 21.4.3 of[1]。

例子：[1035 4150]is the PSDU length vector for awlanVHTConfigobject where theNumUsers属性是2and theMCS属性是[0 3]。

数据类型：双倍的

后卫间隔（循环前缀）持续时间for the data field within a packet specified as one of these values:

  • '长'– Guard interval duration of 800 ns

  • 'Short'- 后卫间隔持续时间为400 ns

数据类型：char|string

组标识号，在间隔[0，63]中指定为整数。

Dependencies

The values0and63apply only when you set theNumUsersproperty to1。间隔中的值[1，62]仅在设置NumUsersproperty to a value other than1。

数据类型：双倍的

Abbreviated indication of the PSDU recipients, specified as an integer in the interval [0, 511].

  • 对于上行链路传输，部分标识号是基本服务集标识符（BSSID）的最后9位。

  • For a downlink transmission, the partial identification number is an identifier that combines the association ID with the BSSID of its serving AP.

For more information, see Table 21-1 of[1]。

数据类型：双倍的

例子

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Open Live Script

Create a VHT configuration object with the default settings.

cfgvht = wlanvhtconfig
cfgVHT = wlanVHTConfig属性:ChannelBandwidth: 'CBW80' NumUsers: 1 NumTransmitAntennas: 1 NumSpaceTimeStreams: 1 SpatialMapping: 'Direct' STBC: 0 MCS: 0 ChannelCoding: 'BCC' APEPLength: 1024 GuardInterval: 'Long' GroupID: 63 PartialAID: 275 Read-only properties: PSDULength: 1035

更新频道带宽。

cfgVHT.ChannelBandwidth ='CBW40'
cfgVHT = wlanVHTConfig with properties: ChannelBandwidth: 'CBW40' NumUsers: 1 NumTransmitAntennas: 1 NumSpaceTimeStreams: 1 SpatialMapping: 'Direct' STBC: 0 MCS: 0 ChannelCoding: 'BCC' APEPLength: 1024 GuardInterval: 'Long' GroupID: 63 PartialAID: 275仅阅读属性：psdulength：1030
Open Live Script

Create a VHT configuration object for a 20 MHz two-user transmission with one antenna per user.

Create awlanVHTConfig对象使用名称值对和内联初始化的组合来更改默认设置。矢量值属性应用特定于用户的设置。

cfgMU = wlanVHTConfig('ChannelBandwidth','CBW20','NumUsers'，2，。。。'GroupID'，2，'num Transmitantennas',2); cfgMU.NumSpaceTimeStreams = [1 1]; cfgMU.MCS = [4 8]; cfgMU.APEPLength = [1024 2048]; cfgMU.ChannelCoding = {'BCC''LDPC'}
cfgMU = wlanVHTConfig with properties: ChannelBandwidth: 'CBW20' NumUsers: 2 UserPositions: [0 1] NumTransmitAntennas: 2 NumSpaceTimeStreams: [1 1] SpatialMapping: 'Direct' MCS: [4 8] ChannelCoding: {'BCC' 'LDPC'} APEPLength: [1024 2048] GuardInterval: 'Long' GroupID: 2 Read-only properties: PSDULength: [1030 2065]

The configuration object settings reflect the updates specified. Properties that aren't modified take their default values.

More About

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参考

[1]IEEE Std 802.11-2020 (Revision of IEEE Std 802.11-2016). “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.” IEEE Standard for Information technology — Telecommunications and information exchange between systems. Local and metropolitan area networks — Specific requirements.

Extended Capabilities

Version History

Introduced in R2015b

See Also

Objects

Functions

Apps

Topics