기술 노트

5G WiGig 802.11ad Primer
•Support for data rates of up to 7 Gbit/s
- 4 transmission modes to achieve different goals (high throughput or high reliability)
•Use of the 60 GHz unlicensed band  (globally available)
- avoids the overcrowded 2.4 GHz and 5 GHz bands
- uses short wavelengths (5 mm) so compact, affordable antennas or arrays
•Backward compatible with the WLAN universe
- “Triband" devices 2.4 GHz and 5 GHz, plus 11ad in the 60 GHz range
•Beamforming
- Overcomes interference during the transmission in realtime

5G WiGig 802.11ad Worldwide Channel & Mask


•4 channels in the 57 GHz to 66 GHz ISM band
•Channel bandwidth is 2.2 GHz

 

 

 

5G WiGig 802.11ad Tx Different mode
•Control PHY: (Mandatory)
exchange signaling and/or control messages to establish & monitor connections between the devices.
MCS0 was selected to provide very robust transmission that can withstand possible interference in the channel.
BPSK modulation is used and the preamble is longer than in the other packets to make the transmission more robust.

•Single Carrier (SC):
385 Mbit/s up to 4.620 Gbit/s depending on MCS.
Total of 12 MCS (1 to 12) with different modulations and code rates, and therefore also different throughputs
Support for MCS 1 to 4 is mandatory.

Structure of the Single Carrier Packet

•The data are transmitted blockwise at 448 symbols per block. Another 64 symbols are inserted between the individual blocks as guard intervals (GI) in order to provide a known reference signal to the receiver in the case of long data packets. The complete block is therefore 512 (448 + 64) symbols in length. The GI is always modulated with π/2-BPSK. Whereas the data can be modulated π/2-QPSK or π/2-16QAM (depending on MCS).

Tektronix 5G WiGig 802.11ad Tx Solution

•업계 유일의 70GHz 리얼타임 오실로스코프를 이용한
57GHz~66GHz  WiGig 전대역폭 RF 신호 측정!
- DPO77002SX ATI 오실로스코프
•업계 최고의 Error Vector Magnitude(EVM) 성능!
- 22% or more better performance
•단일 장비 구성으로 신호 왜곡 발생 가능성 배제
- RF/IF Up/Down 컨버터 필요 없고, 시간 소모적인
시스템 켈리브레이션 절차 없음.
•SiganlVu 벡터 분석 소프트웨어를 이용한 인증테스트
및 디버깅 테스트 지원
Industry Best EVM Performance

CF= 58GHz, QPSK at 1.76 Gsymb/s http://www.keysight.com/upload/cmc_upload/All/Keysight_Test_Solutions_for_802.11ad.pdf

               (TEK) EVM: 2.8% (-33.5 dB)                                  (타사) EVM: 3.6% (-28.9dB)
22% Better EVM improves confidence in characterization

CF= 58GHz, QPSK at 1.76 Gsymb/s    Reference:http://cdn.rohde-schwarz.com/pws/dl_downloads/dl_application/application_notes/1ma257___wideband_mm_wave_signals/1MA257_0e_Wideband_mmWave_Signals.pdf


                   (TEK) EVM: 2.8% (-33.5 dB)                                                              (타사) EVM: 4.8% (-26.4dB)
55% Better EVM improves confidence in characterization

SignalVu WiGig Demodulation & Decoding


Control PHY and Single Carrier


802.11ad Compliance measurements
Section 21.3.2
- Transmit Mask (see next slide)
•Section 21.3.3.
- Center Frequency Tolerance
•Section 21.3.10
- Received channel power indicator (RCPI)
•Section 21.6.4.1 Transmit requirements
- Transmit EVM
•Decoding of the Header
•Estimated SNR
•IQ Origin Offset, Imbalance & Quadrature Error
•Peak EVM at Symbol
•Averaged EVM
•Averaged Frequency Error

 

 

Transmit Mask measurement



Compliance and debugging

Eliminate guesswork on source of errors

Complete Suite of RF measurements

Channel Power, Bandwidth Measurements