January 2008 doc.: IEEE 802.22-08/0015r1
IEEE P802.22
Wireless RANs
Date: 2008-01-29
Author(s):
Name / Company / Address / Phone / email
Edward Au / Huawei & HKUST / Department of ECE, HKUST, Clear Water Bay, Hong Kong / (852) 2358-8027 /
Zander Lei / Institute for Infocomm Research, Singapore / 21 Heng Mui Keng Terrace, Singapore 119613 / (65) 6874-5686 /
George Vlantis / STMicroelectronics / 1060 East Brokaw Road,
San Jose, CA 95131 / +1-408-451-8109 /
1. Section 8.1.1
Change
“The transmitted RF signal can be represented mathematically as:
where
Re(.) real part of the signal
N number of symbols in the PPDU
TSYM OFDM symbol duration
fc carrier centre frequency
sn(t) complex base-band representation of the nth symbol
(6)
The exact form of sn(t) is determined by the n and whether the symbol is part of the DS or US.”
to
The transmitted RF signal can be represented mathematically as, during any OFDMA symbol duration
,
where
t is the time, elapsed since the beginning of the subject OFDMA symbol, with
TSYM is the OFDMA symbol duration, including cyclic prefix duration
Re(.) real part of the signal
is the carrier frequency
is a complex number; the data to be transmitted on the subcarrier whose frequency offset index is k, during the subject OFDMA symbol. It specifies a point in a QAM constellation.
is the subcarrier frequency spacing
TCP is the time duration of cyclic prefix
NT is the number of used subcarriers (not including DC subcarrier).
2. Section 8.3.2, Line 2
Change “PHY mode 0” to “PHY mode 1”.
3. Section 8.11
Revise the following two paragraphs
“At the BS, the transmitted center frequency, receive center frequency, and the symbol clock frequency shall be derived from the same reference oscillator. The accuracy of this reference oscillator shall be better than ±2 ppm.
At the CPE, both the transmitted center frequency and the symbol clock frequency shall be synchronized to the BS with a tolerance of 2% of the subcarrier spacing.”
as
“At the BS, the transmitted center frequency, receive center frequency, and the symbol clock frequency shall be derived from the same reference oscillator. At the BS, the reference frequency tolerance shall be better than ±2 ppm.
At the CPE, both the transmitted center frequency and the symbol clock frequency shall be synchronized and locked to the BS with a tolerance of maximum 2% of the subcarrier spacing.”
References:
Submission page 1 Edward Au, Huawei & HKUST