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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 Mese, 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”


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