Doc.: IEEE 802.11-15/xxxx Submission Control PHY Design for 40-50GHz Millimeter Wave Communication...
15
doc.: IEEE 802.11-15/xxxx Submission Control PHY Design for 40-50GHz Millimeter Wave Communication Systems.pptx Authors: May 2015 Slide 1 Jianhan Liu, et. al. (MediaTek) N am e A ffiliations A ddress Phone em ail Jianhan Liu M ediaTek U SA 2860 Junction A ve., San Jose, CA 95134 U SA +1-408-526-1899 [email protected] Frank H su M ediaTek Inc. N o. 1, D using 1st Road, H sinchu, 300 Taiw an +886-3-567-0766 frank.hsu@ mediatek.com Jam esY ee james.yee@ mediatek.com
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Transcript of Doc.: IEEE 802.11-15/xxxx Submission Control PHY Design for 40-50GHz Millimeter Wave Communication...
doc.: IEEE 802.11-15/xxxx
Submission
Control PHY Design for 40-50GHz Millimeter Wave Communication Systems.pptx
Authors:
May 2015
Slide 1 Jianhan Liu, et. al. (MediaTek)
Name Affiliations Address Phone email
Jianhan Liu MediaTek USA 2860 Junction Ave., San Jose,
CA 95134 USA +1-408-526-1899 [email protected]
Frank Hsu MediaTek Inc.
No. 1, Dusing 1st Road, Hsinchu, 300 Taiwan
+886-3-567-0766
James Yee [email protected]
doc.: IEEE 802.11-15/xxxx
Submission
Introduction
• Link budget analysis shows that beamforming is needed to support 10m NLOS
• Discovery and beamforming training needs control PHY that works in low SNR regime
• This proposal designs a Control PHY with low implementation complexity and good performance
May 2015
Slide 2 Jianhan Liu, et. al. (MediaTek)
doc.: IEEE 802.11-15/xxxx
Submission
Link Budget for NLOS case
• Extra gain needed• SNR requirement is 1.0 dB for BPSK, ½ rate code• Extra Gain Needed: 20*log10(d)-(Rx_SNR-required_SNR)=16dB
May 2015
Slide 3 Jianhan Liu, et. al. (MediaTek)
Tx power (dBm) 10Tx Antenna Gain 0Center Frequency (GHz) 45Propogation Loss at 1m (dB) 65.56425Shawdowing+link margin 10RX antenna Gain 0Receiver Signal Strength -65.5643
Rx Noise Figure (dB) 10Immeplentaion loss (dB) 2BW (GHz) 1Noise Floor -84RX SNR (dB) 6.43575
SNR BPSK, LDPC 1/2 1.0Distance (m) 1.573213extra gain needed for 10m NLOS (dB) 16.06425
doc.: IEEE 802.11-15/xxxx
Submission
Design Requirements on Control PHY[1]
• One side beamforming gain can be provided by sector level sweep– Gain is about 10*log10(N), N it the number of antenna, for
example, using 8 antennas can get 6-9 dB– Note that receive antenna gain does not count Tx power
increase.
• Assume 8dB Gain is provided by one side beamforming, than extra gain 8dB is needed for BPSK and LDPC ½ rate code.
• We need a low rate PHY that can operate at SNR:– -8+1.0=-7 dB.
May 2015
Slide 4 Jianhan Liu, et. al. (MediaTek)
doc.: IEEE 802.11-15/xxxx
Submission
Control PHY Design
May 2015
Slide 5 Jianhan Liu, et. al. (MediaTek)
– Control PHY Preamble still uses ZCZ sequences• Easier for implementation since common preamble sequences for SC
PHY and OFDM PHY [2]
– Control PHY is only transmitted in 540MHz channel• To get extra range and reduce the complexity
– Control PHY Header and Data portion • Modulation: BPSK with LDPC encoded • Single Carrier (SC) with Spreading• Spreading factor is changeable for flexible designs and different
spectrum efficiency.
doc.: IEEE 802.11-15/xxxx
Submission
Spreading with Barker Sequences• Spreading using Barker Sequences
• Barker sequence is a finite sequence of N values of +1 and −1 with ideal correlation property
• The chosen spreading sequences are in read and filled with blue color.• Barker Sequence has the lowest sidelobe level ratio among all binary
sequences• reading with factor 13 provides 11dB SNR enhancement
May 2015
Slide 6 Jianhan Liu, et. al. (MediaTek)
Length Codes Sidelobe level ratio SNR Gain
2 +1 −1 +1 +1 −6 dB 3dB
3 +1 +1 −1 −9.5 dB 4.7dB
4 +1 +1 −1 +1 +1 +1 +1 −1 −12 dB 6dB
5 +1 +1 +1 −1 +1 −14 dB 7dB
7 +1 +1 +1 −1 −1 +1 −1 −16.9 dB 8.4dB
11 +1 +1 +1 −1 −1 −1 +1 −1 −1 +1 −1 −20.8 dB 10.4dB
13 +1 +1 +1 +1 +1 −1 −1 +1 +1 −1 +1 −1 +1 −22.3 dB 11.1dB
doc.: IEEE 802.11-15/xxxx
Submission
Signaling on spreading factor• Spreading factor signaling information can be
conveyed using a field control PHY header – PHY header is spread with barker sequence 13 and with fixed
encoding schemes.
May 2015
Slide 7 Jianhan Liu, et. al. (MediaTek)
Field name Number of Bits Starting
Bit
Description
Reserved 1 0Set to 0 (differential detector
initialization).
Scrambler
Initialization
4 1Bits of the initial scrambler state
Length 10 5Number of data octets in the PSDU. Range
14-1023.
Packet Type 1 15TRN packet type
Training Length 5 16
Length of the training field.
Turnaround1 21
Set to 1 if the STA is transmitting a packet during an SP or TXOP.
Spreading Factor2 22
Set to 0: spreading by 13 Set to 1: spreading by 7 Set to 2: spreading by 4
Set to 3: no spreadingHCS
16 24Header Check sequence.
doc.: IEEE 802.11-15/xxxx
Submission
Simulation Settings
• LDPC code rate ½• BPSK modulation• Spreading factor 4, 5, 7, 11, 13• Packet size 42 bytes (336 bits)• Real Channel Estimation based on Channel Estimation
Sequences using ZCZ 256 sequences• AWGN, Exp 4ns, Exp 10 ns, Exp 20 ns channels
May 2015
Slide 8 Jianhan Liu, et. al. (MediaTek)
doc.: IEEE 802.11-15/xxxx
Submission
PER in AWGN Channels
With Spreading 13, system can work at SNR less than -11dB, which is good enough for an AP with 4 TX antennas.
-12 -11 -10 -9 -8 -7 -6 -510
-3
10-2
10-1
100
SNR (dB)
BLO
CK
ER
RO
R R
AT
E
SF13 AWGN
SF11 AWGN
SF7 AWGNSF5 AWGN
SF4 AWGN
SF SNR (dB) @10-1 PER
13 -11.2
11 -10.6
7 -9.1
5 -7.9
4 -7.0
PER
May 2015
Slide 9 Jianhan Liu, et. al. (MediaTek)
doc.: IEEE 802.11-15/xxxx
Submission
BLER in Exp 4ns Channels
-12 -10 -8 -6 -4 -2 010
-3
10-2
10-1
100
SNR (dB)
BLO
CK
ER
RO
R R
AT
E
SF13 Exp 4ns
SF11 Exp 4ns
SF7 Exp 4nsSF5 Exp 4ns
SF4 Exp 4ns
SF SNR (dB) @10-1 PER
13 -10.6
11 -9.9
7 -8.2
5 -6.7
4 -5.2
PER
May 2015
Slide 10 Jianhan Liu, et. al. (MediaTek)
doc.: IEEE 802.11-15/xxxx
Submission
BLER in Exp 10ns Channels
-12 -10 -8 -6 -4 -2 010
-3
10-2
10-1
100
SNR (dB)
BLO
CK
ER
RO
R R
AT
E
SF13 Exp 10ns
SF11 Exp 10ns
SF7 Exp 10nsSF5 Exp 10ns
SF4 Exp 10ns
SF SNR (dB) @10-1 PER
13 -9.7
11 -9.2
7 -7.3
5 -5.3
4 -3.2
PER
May 2015
Slide 11 Jianhan Liu, et. al. (MediaTek)
doc.: IEEE 802.11-15/xxxx
Submission
BLER in Exp 20ns Channels
-12 -10 -8 -6 -4 -2 0 2 410
-3
10-2
10-1
100
SNR (dB)
BLO
CK
ER
RO
R R
AT
E
SF13 Exp 20ns
SF11 Exp 20ns
SF7 Exp 20nsSF5 Exp 20ns
SF4 Exp 20ns
SF SNR (dB) @10-1 PER
13 -8.1
11 -7.5
7 -5.6
5 -3.1
4 -0.2
PER
May 2015
Slide 12 Jianhan Liu, et. al. (MediaTek)
doc.: IEEE 802.11-15/xxxx
Submission
Performance Summary
• SNR @ 10-1 PER
SF AWGN Exp 4ns Exp 10 ns Exp 20ns
13 -11.2 -10.6 -9.7 -8.1
11 -10.6 -9.9 -9.2 -7.5
7 -9.1 -8.2 -7.3 -5.6
5 -7.9 -6.7 -5.3 -3.1
4 -7.0 -5.2 -3.2 -0.2
May 2015
Slide 13 Jianhan Liu, et. al. (MediaTek)
doc.: IEEE 802.11-15/xxxx
Submission
Summary
• Link Budget analysis shows that a control PHY that works in low SNR regime is required.
• We propose a control PHY design with low implementation cost and good PER performance.
May 2015
Slide 14 Jianhan Liu, et. al. (MediaTek)
doc.: IEEE 802.11-15/xxxx
Submission
References
• [1] WPAN-PG4-T-14-036-00 Mediatek Introduction to Beamforming Protocols for 40-50GHz
• [2] Complete-specification-proposal-IEEE-802.11aj(45GHz)_v0.1.1
May 2015
Slide 15 Jianhan Liu, et. al. (MediaTek)
