当前位置:首页 >> 信息与通信 >>

IEEE802.11ad


关于IEEE802.11ad 物理层

IEEE802.11ad Physical Layer
? Proposed: Four different PHYs
– SC PHY – OFDM PHY – Control PHY – Low Power SC PHY

Slide 2

Murat M

ese, Broadcom, et. al.

PHY Overview

Channelization
Channel starting Channel frequency(GHz) spacing (MHz) Channel set Transmit power limit (dBm) Emissions limits set Behavior limits set

Country

USA
Australia Japan Europe

59.4
59.4 59,4 59.4

2160
2160 2160 2160

2,3,4
2 2,3,4 2,3,4

---------

0
0 0 0

0
0 0 0

Over Spectral Mask (All Modes)
0 dBr

-20 dBr -25 dBr

-30 dBr
-2.2 -1.6 -1.1 -0.94 0 +0.94 +1.1 +1.6 +2.2

(f-fc) (GHz)

1. Common Parameters

Frame Format
Common Preamble
Short Traning Field Channel Estimaton

Header

Data

TRN-R/T subfield

Ga128 Ga128 Ga128

Ga128 Ga128 -Ga128

Gu512

Gv512

Gv128

Short Traning Field(STF) 1920Tc

Channel Estimaton Field 1152Tc

SC PHY

OFDM PHY

-HCS (header check sequence ):

CRC 16-CCITT -Common FEC
LDPC Code rates: R1=1/2, R2=5/8, R3=3/4 and R4=13/16, all 672 bits

-Data scrambler

IEEE802.11ad Physical Layer
? Proposed: Four different PHYs

–SC PHY
– OFDM PHY – Control PHY – Low Power SC PHY

2. mmWave SC PHY

SC PHY Frame Format

STF: Short Training Field (acquisition) CEF: Channel Estimation Field BLK: data block (described in payload encoding)
Optional trailing AGC subfields and TRN-R/T subfields are for beamforming

Header fields

Modulation and Coding Scheme for SC

SC PHY Header Encoding
d(1:64) d(1:64)

z(65:504)

(672,504) LDPC Encoder

Shorten & Puncture

p(1:152)

punc[1]={161,162,…,168}, punc[2]={153,154,…,160} p(153:160) p(161:168)

p(1:152)

d(1:64)

p(1:152)

d(1:64)

p(1:152)

448-bit SC header output

SC PHY Data field Encoding

-Payload bits are broken into blocks of LCWD = 336, 420, 504, or 545 data bits and encoded by the LDPC codeword encoder to produce blocks of 672 bits. -Data pad (0) is added to ensure that full codewords are transmitted. The zero bits are scrambled with the continuation of the scrambler sequence. -Block pad (0) is added to ensure that full SC blocks are transmitted. The zero bits are scrambled with the continuation of the scrambler sequence.

SC PHY Modulation Mapping π/2-BPSK Modulation

BPSK constellation bit encoding
Two phase transitions are possible with every symbol for BPSK, but 4 constellation points are used.

π/2-QPSK Modulation

QPSK constellation bit encoding

π/2-16QAM Modulation

Symbol Blocking and Guard Insertion
NCBPB:Coding Bits Per Block Values of NCBPB

Block transmission

SC PHY Performance requirements
Transmit EVM (Error Vector Magnitude)

Receive Sensitivity
MCS Indexes
1 2 3 4 5 6 7 8 9 10 11
12

Modulation
π/2-BPSK π/2-BPSK π/2-BPSK π/2-BPSK π/2-BPSK π/2-QPSK π/2-QPSK π/2-QPSK π/2-QPSK π/2-16QAM π/2-16QAM π/2-16QAM

Coding Rate
? with repetition 1/2 5/8 3/4 13/16 1/2 5/8 3/4 13/16 1/2 5/8 3/4

Receive Sensitivity (dBm)
-68 -67 -65 -64 -62 -63 -62 -61 -59 -55 -54 -53

SCM Performance-AWGN
10
0

Simulation Conditions: ? Packet Length-8192 Bytes ? AWGN ? Red line-With impairments (PN, PA) ? Blue line-no impairments

BPSK MCSs
PER
10
-1

mcs=1 mcs=2 mcs=3 mcs=4 mcs=5 mcs=1 mcs=2 mcs=3 mcs=4 mcs=5 10
10
0

-2

-3
10
0

-2

-1

0

1 RX SNR (dB)

2

3

4

5

16QAM MCSs
PER
10
-1

mcs=6 mcs=7 mcs=8 mcs=9 mcs=6 mcs=7 mcs=8 mcs=9

QPSK MCSs
PER
10
-1

mcs=10 mcs=11 mcs=12 mcs=10 mcs=11 mcs=12 10
-2

6

7

8

9

10

11 RX SNR (dB)

12

13

14

15

16

10

-2

2

3

4

5

6 RX SNR (dB)

7

8

9

10

IEEE802.11ad Physical Layer
? Proposed: Four different PHYs
– SC PHY

–OFDM PHY
– Control PHY – Low Power SC PHY

3. mmWave OFDM PHY

OFDM PHY Frame Format

Header fields

- Header fields(续)

Modulation and Coding Scheme for OFDM

OFDM PHY Data field

Scrambler Encoding

Modulation Mapping
SQPSK Modulation(Spread QPSK)
C1 C2 C3 C3 Cn-3 Cn-2 Cn-1 Cn

Subcarrier Mapping d1 d 2

dp(1) dp(2)

QPSK modulation
16-QAM Modulation

64-QAM Modulation

Tone Pairing for SQPSK and QPSK

OFDM PHY Performance Requirements
Transmit Requirements

Rx Requirements
Receive Sensitivity
MCS Indexes 13 14 15 16 17 Modulation Coding Rate 1/2 5/8 1/2 5/8 3/4 Receive Sensitivity (dBm)
-66 -64 -63 -62 -60

SQPSK SQPSK QPSK QPSK QPSK

18
19 20 21

16QAM
16QAM 16QAM 16QAM

1/2
5/8 3/4 13/16

-58
-56 -54 -53

22
23
24

16QAM
16QAM 16QAM

5/8
3/4 13/16

-51
-49 -47

OFDM Performance-AWGN
Simulation Conditions:
? Packet Length-8192 Bytes ? AWGN upper diagram ? 4ns EXP PDP lower diagram ? Timing and Freq Sync ? Ideal PA ? 13.75ppm CF/Symbol Clock Offset ? No Phase Noise
Packet Error Rate

10

0

10

-1

mcs 13 mcs 14 mcs 15 mcs 16 mcs 17 mcs 18 mcs 19 mcs 20 mcs 21 mcs 22 mcs 23 mcs 24

10

-2

10

-3

-2

0

2

4

6

8

10 SNR (dB)

12

14

16

18

20

IEEE802.11ad Physical Layer
? Proposed: Four different PHYs
– SC PHY – OFDM PHY

–Control PHY
– Low Power SC PHY

4. mmWave Control PHY

Frame Format

Control PHY header fields

Data field

Scrambler

Encoder

Modulation

Performance requirements
Transmit EVM

Receive Sensitivity -78dBm

Control MCS Performance
Simulation Conditions: ? Packet Length-256 Bytes ? AWGN ? No impairments

IEEE802.11ad Physical Layer
? Proposed: Four different PHYs
– SC PHY – OFDM PHY – Control PHY

–Low Power SC PHY

5.mmWave low power SC PHY

Low Power SC Mode Motivation
? Targets:
– Peak power for the entire solution including PHY, MAC, Memory, RF, IOs, peripheral < 500 mW (e.g., USB 2.0) – Average power of PHY/MAC < 150 mW – Maximum delay spread for a 2 m range is in the order of 5 ns

? Therefore, there is a need for a low complexity low power mode that satisfies these requirements:
– Simple FEC:
? Reed Solomon (224,208) for high data rate ? Outer Reed Solomon (224,208) + Inner Hamming like block code(16,8) for medium data rate

– Simple Equalizer for very short multipath

SC Low Power MCS set

? The FEC is one of the major contributor to the relatively high power consumption of the current SC mode

? Simple FEC:
– Reed Solomon (224, 208) for high data rate – Outer Reed Solomon (224, 208) + Inner Hamming like block code (16,8) for medium data rate

Header encoding and modulation
scramble

RS(24,8) encoding

(16,8)Block encoding

Prepending One Zero Octet

7x8 Interleaving

π/2-BPSK

Data Encoding
RS(224, 208) Coding

(16,8) Block-coding

Modulation
The same π/2-BPSK and π/2-QPSK described above are used in the mmWave low power SC PHY.

Blocking

Blocking for low power SC

Receive Sensitivity
MCS Indexes 25 26 27 Modulation π/2-BPSK π/2-BPSK π/2-QPSK Coding Rate Receive Sensitivity (dBm)

-60 RS(224,208)+ Block-Code(16,8) RS(224,208) RS(224,208) -64 -57

Low Power MCS Performance
10
0

Frame Error Rate vs. SNR (4K octets frames)

Simulation Conditions:
10
-1

RS(224,208)+Block(16,8) - AWGN RS(224,208)- AWGN

? Packet Length-4096 Bytes ? AWGN-Upper Figure ? 1ns RMS Delay Spread-Lower Figure ? No impairments

10

-2

FER
10
-3

10

-4

0

1

2

3

4 SNRdB

5

6

7

8

10

0

Frame Error Rate vs. SNR (4K octets frames) RS(224,208)+Block(16,8) - Multipath RS(224,208)- Multipath

10

-1

FER

10

-2

10

-3

10

-4

0

2

4

6

8 SNRdB

10

12

14

16

18

参考文献
[1]. IEEE 802.11-10/0433r2(text) ,“PHY/MAC Complete Proposal Specification” [2]. IEEE 802.11-10/0431r3(text), “PHY Simulations and Methodology”

[3] .IEEE 802.11-10/0432r0(slide) ,“PHY/MAC Complete Proposal to Tgad”
[4] .IEEE 802.11-09/0296r16(text),“TGad Evaluation Methodology”


相关文章:
802.11标准列表
Broadcom 公司于 2012 年 1 月 5 日也发布了它的第一支支持 802.11ac 的芯片。 IEEE 802.11ad: Very High Throughput 60 GHz (December 2012) - see ...
802.11系列各版本的区别
IEEE 802.11g2003 年 7 月,通过了第三种调变标准。其载波的频率为 2.4GHz,...27.802.11ad 1. 802.11ad 工作在 57-66 GHz 频段。 802.11ad 草案显示...
802.11无线局域网(wlan)
802.11 的标准和补充主要有: * IEEE 802.11 ,1997 年,原始标准(2Mbit/s,...802.11b 运作模式基本分为两种:点对点模式 (ad-hoc mode) 和基本模式(...
802.11ah网上介绍
802.11ad 正式形态化,昨天(9 月 12 日)上午,工信部电信研究院标准所所长王 ...预计最早在今年 9 月底,IEEE 小组将针对 802.11ah 标准进行首次投票,而 最终...
无线局域网IEEE 802.11aj协议设计及仿真分析
无线局域网IEEE 802.11aj协议设计及仿真分析_信息与通信_工程科技_专业资料。无线局域网 IEEE 802.11aj 协议设计及仿真分析 1、引言 由于电子技术的不断创新, IE...
第五代WiFi 802.11ac
无线局域网(WLAN)推行之初被普遍认可的两个国际标准是 IEEE802.11a 和 802....802.11 系列标准的目标之一就是后向兼容,对于 802.11ac 和 ad 来说主要...
IEEE802.11ac
? ? IEEE 802.11ad: Very High Throughput 60 GHz (December 2012) - see WiGig IEEE 802.11ae: Prioritization of Management Frames (2012 年 3 月) ...
802.11读书笔记
在此基础上分析了802.11工作组最新修订中的极大吞吐量标准802.11ac和 802.11ad,并对802.11系列标准的发展前景和方向做出了总结。 IEEE802工作组制定的标准主要...
几种无线传输协议及设备
该技术基于 IEEE802.11ad 标准,是 一种基于60Hz 高频频段的高速短距离无线技术。目前 WiGig 支持的带宽达到了7Gbps,支 持高清影音无损压缩的传输,不过传输距离...
深度解读 802.11ac无线技术
以地理位置或者技术中心作为组织单位(例如 IEEE 费城分会和 IE EE 计算机协会]...802.11ad--应用至上满足多彩生活 802.11ad 的出现针对的是多路高清视频和无损...
更多相关标签:
802.11ad | ieee 802.11 ad hoc | ieee802.3ad | ieee802.1ad | ieee 802.3ad pdf | ieee 802.11 | ieee802.11标准 | ieee802.11ac |