1. Pilot Pattern for 120MHz Date: 2010-11-10 Authors: Month Year
doc.: IEEE yy/xxxxr0
Pilot Pattern for 120MHz
Date:
Authors:
Slide 1
Sun Bo, ZTE Corp
Page 1
John Doe, Some Company

2. Abstract
In R3.1.E: The draft specification shall include support for an efficient channelization in China’s (5,725 ~ 5,850 MHz) spectrum.
To complement with a 120MHz signal design, the pilot pattern design is proposed in this contribution, including:
Number and location of pilot tone
Guard tone
DC tone
Slide 2
Sun Bo, ZTE Corp

3. Background In last Hawaii meeting, following statements were accepted:
In R3.1.E: The draft specification shall include support for an efficient channelization in China’s (5,725 ~ 5,850 MHz) spectrum.
A possible 120MHz signal solution in Chinese 5GHz spectrum is as figured below.
5727.5
7.5
5735
40MHz
80MHz
20MHz
5847.5
f MHz
120MHz
5835
12.5
Sun Bo, ZTE Corp

4. Legacy pilot pattern for 20MHz
The pilot pattern for 20MHz in n spec is as below. There are totally 64 subcarriers containing:
4 pilot tones located at {±7, ±21}
(6 left+5 right) guard tones
3 DC tones
Slide 4
Sun Bo, ZTE Corp

5. Pilot Pattern for a Single 80MHz
Design for 80MHz [2]
Repetition of the LSIG pilot pattern across 80MHz
Not desirable to change pilot positions between the legacy (11a/n) and VHT parts of the packet.
For simple receiver design, better to pick 80MHz pilots among the pilots after repetition
Considering the tradeoff between the performance and overhead
8 pilots for 80MHz has been accepted
also 16 pilots for 160MHz
Slide 5
Sun Bo, ZTE Corp

6. Pilot Pattern for a Single 120MHz
Design for 120MHz using the method of 80MHz
Pilot pairs of 20MHz are located at {±7, ±21}
Repeating pilot pattern of 20MHz 5 times
Totally 384 subcarriers for 120MHz signal.
Pilot pairs are located at {±11, ±25, ±39, ±53, ±75, ±89, ±103, ±117 , ±139, ±153, ±167, ±181} .
Propose to use 12 polits for 120MHz
Pilots location pairs:{±11, ±39, ±75, ±103, ±139, ±167} with maximally separated.
(6 left+5 right) guard tones and 3 DC tones.
Slide 6
Sun Bo, ZTE Corp

7. References [1] IEEE Std 802.11n-2009.
[2]Sudhir Srinivasa . et al., “80MHz Tone Allocation”, IEEE /0370r01
Sun Bo, ZTE Corp

8. Thank you!