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wlanvhtsigaGydF4y2Ba

Generate VHT-SIG-A waveform

在页面中崩溃GydF4y2Ba

句法GydF4y2Ba

y= wlanVHTSIGA(cfg)
[y，bits] = wlanvhtsiga（CFG）GydF4y2Ba
[[GydF4y2Ba___GydF4y2Ba] = wlanvhtsiga（CFG，OversyplingFactor = OSF）GydF4y2Ba

Description

例子GydF4y2Ba

yGydF4y2Ba= wlanVHTSIGA(CFGGydF4y2Ba）GydF4y2Ba生成aGydF4y2BaVHT-SIG-A1GydF4y2Batime-domain waveform for the specified transmission parameters. SeeVHT-SIG-A处理GydF4y2Ba用于波形生成细节。GydF4y2Ba

[[GydF4y2BayGydF4y2Ba，，，，GydF4y2Babits] = wlanVHTSIGA(CFGGydF4y2Ba）GydF4y2Baalso outputsVHT-SIG-A信息位。GydF4y2Ba

[[GydF4y2Ba___GydF4y2Ba] = wlanVHTSIGA(CFGGydF4y2Ba，，，，OversamplingFactor=osf）GydF4y2Ba用指定的过采样因子生成过采样的波形。有关过采样的更多信息，请参阅GydF4y2Ba基于FFT的过采样GydF4y2Ba。GydF4y2Ba

Examples

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Open Live Script

为80 MHz传输包生成VHT-SIG-A波形。GydF4y2Ba

Create a VHT configuration object, assign an 80 MHz channel bandwidth, and generate the waveform.

cfgvht = wlanvhtconfig;CFGVHT.CHANNELBANDWIDTH =GydF4y2Ba'CBW80';y= wlanVHTSIGA(cfgVHT); size(y)
ans =1×2GydF4y2Ba640 1

80 MHz波形具有两个OFDM符号，总共有640个样品。每个符号包含320个样本。GydF4y2Ba

Open Live Script

生成40 MHz传输包的VHT-SIG-A波形。GydF4y2Ba

Create a VHT configuration object, and assign a 40 MHz channel bandwidth.

cfgvht = wlanvhtconfig;CFGVHT.CHANNELBANDWIDTH =GydF4y2Ba'cbw40'GydF4y2Ba;GydF4y2Ba

生成VHT-SIG-A波形和信息位。GydF4y2Ba

[y，bits] = wlanvhtsiga（cfgvht）;GydF4y2Ba

从返回的位中提取带宽并进行分析。带宽信息包含在前两个位。GydF4y2Ba

bwbits =位（1：2）;BI2DE（BWBITS）GydF4y2Ba
ans =2x1 int8 column vector1 0GydF4y2Ba

As defined in IEEE Std 802.11ac-2013, Table 22-12, a value of'1'GydF4y2Bacorresponds to 40 MHz bandwidth.

Input Arguments

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传输参数，指定为GydF4y2BawlanvhtconfigGydF4y2Ba目的。GydF4y2Ba

过采样因子，，，，specified as a scalar greater than or equal to 1. The oversampled cyclic prefix length must be an integer number of samples.

数据类型:GydF4y2Ba单身的GydF4y2Ba|GydF4y2Badouble|GydF4y2Baint8GydF4y2Ba|GydF4y2Baint16|GydF4y2Baint32|GydF4y2Baint64|GydF4y2BaUINT8GydF4y2Ba|GydF4y2Bauint16|GydF4y2BaUINT32GydF4y2Ba|GydF4y2BaUint64GydF4y2Ba

输出参数GydF4y2Ba

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VHT-SIG-Atime-domain waveform, returned as annGydF4y2BasGydF4y2Ba-by-nGydF4y2BatGydF4y2Ba矩阵。GydF4y2BanGydF4y2BasGydF4y2Ba是时间域样本的数量，以及GydF4y2BanGydF4y2BatGydF4y2Bais the number of transmit antennas.

nGydF4y2BasGydF4y2Bais proportional to the channel bandwidth. The time-domain waveform consists of two symbols.

信道带宽GydF4y2Ba nGydF4y2BasGydF4y2Ba
'cbw20'GydF4y2Ba 160GydF4y2Ba
'cbw40'GydF4y2Ba 320
'CBW80' 640
'CBW160' 1280GydF4y2Ba

看GydF4y2BaVHT-SIG-A处理GydF4y2Ba用于波形生成细节。GydF4y2Ba

数据类型:GydF4y2Badouble
复杂的数字支持：万博1manbetxGydF4y2Ba是的GydF4y2Ba

信号位用于GydF4y2BaVHT-SIG-A，，，，returned as a 48-bit column vector.

数据类型:GydF4y2Baint8GydF4y2Ba

更多关于GydF4y2Ba

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VHT-SIG-A

非常高的吞吐量信号A（VHT-SIG-A）字段包含解释VHT格式数据包所需的信息。类似于非HT OFDM格式的非HT信号（L-SIG）字段，该字段存储了VHT格式数据包的实际速率值，通道编码，后卫间隔，MIMO方案和其他配置详细信息。与HT-SIG字段不同，此字段不存储数据包长度信息。数据包长度信息来自L-SIG，并在VHT格式的VHT-SIG-B字段中捕获。GydF4y2Ba

For a detailed description of the VHT-SIG-A field, see section 21.3.8.3.3 of IEEE®GydF4y2BaSTD 802.11™-2016。VHT-SIG-A字段由两个符号组成：VHT-SIG-A1和VHT-SIG-A2。这些符号位于VHT格式PPDU的L-SIG和VHT-STF部分之间。GydF4y2Ba

这VHT-SIG-A field includes these components. The bit field structures for VHT-SIG-A1 and VHT-SIG-A2 vary for single user or multiuser transmissions.

  • BWGydF4y2Ba-A two-bit field that indicates 0 for 20 MHz, 1 for 40 MHz, 2 for 80 MHz, or 3 for 160 MHz.

  • STBCGydF4y2Ba-A bit that indicates the presence of space-time block coding.

  • 组IDGydF4y2Ba-A six-bit field that indicates the group and user position assigned to a STA.

  • nGydF4y2BastsGydF4y2Ba- 单个用户的三位字段或用于多用户方案的4个三位字段，指示每个用户的时空流数量。GydF4y2Ba

  • 部分援助GydF4y2Ba-一个identifier that combines the association ID and the BSSID.

  • txop_ps_not_loweredGydF4y2Ba-一个indicator bit that shows if client devices are allowed to enter dose state. This bit is set to false when the VHT-SIG-A structure is populated, indicating that the client device is allowed to enter dose state.

  • 短giGydF4y2Ba-A bit that indicates use of the 400 ns guard interval.

  • 简短的吉氏歧义GydF4y2Ba- 一些表明使用短GI时是否需要额外的符号。GydF4y2Ba

  • sU/MU[0] Coding- 一个位字段，指示在多用户方案中使用卷积或LDPC编码用于单个用户或用户MU [0]。GydF4y2Ba

  • LDPC额外OFDM符号GydF4y2Ba-A bit that indicates if an extra OFDM symbol is required to transmit the data field.

  • MCS- 一个四位领域。GydF4y2Ba

    • 对于单个用户场景，它表示使用的调制和编码方案。GydF4y2Ba

    • For a multiuser scenario, it indicates use of convolutional or LDPC coding and the MCS setting is conveyed in the VHT-SIG-B field.

  • 光束形成GydF4y2Ba- 当将光束成型矩阵应用于传输时，指示位设置为1。GydF4y2Ba

  • CRC- 一个用于检测VHT-SIG-A传输中误差的八位字段。GydF4y2Ba

  • 尾巴GydF4y2Ba-A six-bit field used to terminate the convolutional code.

Algorithms

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VHT-SIG-A处理GydF4y2Ba

这GydF4y2BaVHT-SIG-A字段包括处理VHT格式数据包所需的信息。GydF4y2Ba

有关算法详细信息，请参阅IEEE STD 802.11ac™-2013GydF4y2Ba[[1],部分22.3.4.5。这GydF4y2BawlanvhtsigaGydF4y2Bafunction performs transmitter processing on theVHT-SIG-Afield and outputs the time-domain waveform.

基于FFT的过采样GydF4y2Ba

一个GydF4y2Baoversampled信号是以高于Nyquist速率的频率采样的信号。WLAN通过使用小型护罩带来最大化占据的带宽，这可能会给抗成像和抗氧化滤镜带来问题。相对于总信号带宽增加了防护带宽度的增加，从而增加了信号中的样品数量。GydF4y2Ba

该功能在生成OFDM波形时使用较大的iFFT和零垫进行过采样。该图显示了带有OFDM波形的过采样过程GydF4y2BanGydF4y2BaFFTsubcarriers comprisingnGydF4y2BaGGydF4y2Ba后卫子载波在两侧的两边GydF4y2BanGydF4y2Ba英石GydF4y2Ba占领带宽子载波。GydF4y2Ba

FFT-based oversampling.

References

[[1] IEEE Std 802.11ac™-2013 IEEE Standard for Information technology — Telecommunications and information exchange between systems — Local and metropolitan area networks — Specific requirements — Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications — Amendment 4: Enhancements for Very High Throughput for Operation in Bands below 6 GHz.

扩展功能GydF4y2Ba

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

版本历史记录GydF4y2Ba

Introduced in R2015b

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1GydF4y2BaIEEE STD 802.11AC-2013经IEEE许可改编并重印。版权所有2013。保留所有权利。GydF4y2Ba