Medium Access Control (MAC) and Physical Layer (PHY) - CISE

4-June-07 P1901_PRO_016_r0
Several of these symbols are concatenated in a burst as expressed in Equation 25
3.8 REFERENCE SIGNALS
3.8.1 Channel reference symbol
s ( n)
= ∑ si
( n − iN SYM )
i
Equation 25
The channel reference symbol comes before the data and control symbols. The channel reference symbol
followsEquation 24 with
c( k,
i)
= exp( jφk
)
Equation 26
where φk is a random phase picked from a uniform distributed random variable between [0,2π[. The channel
reference symbol gives the initial reference for the subcarrier modulation (3.6)
3.8.2 Synchronization symbol
The synchronization symbol comes before the channel reference symbol. The synchronization symbol follows
Equation 24 with
c(
k,
i)
⎧
= ⎨
⎩
2 exp(
Submission page 61 UPA-OPERA
0
jφ
)
k
Equation 27
k
k
even
where φk is a random phase picked from a uniform distributed random variable between [0,2π[.
3.8.3 Start Of Transmission (SOT)
A start of transmission signal shall always be sent before the synchronization symbol. The SOT is also used as
response to the different polling frames (See 4.3.5 and 4.3.6). In reception the SOT may be used for AGC. The
odd