Thomas Kunz
Systems and Computer Engineering
207
HIPERLAN 1 Physical Layer Frames
nMaintaining a high data-rate (23.5 Mbit/s) is power consuming - problematic for mobile terminals
–packet header with low bit-rate comprising receiver information
–only receiver(s) address by a packet continue receiving
nFrame structure
–LBR (Low Bit-Rate) header with 1.4 Mbit/s
–450 bit synchronization
–minimum 1, maximum 47 frames with 496 bit each
–for higher velocities of the mobile terminal (> 1.4 m/s) the maximum number of frames has to be reduced
n
•
•
n
nModulation
–GMSK for high bit-rate, FSK for LBR header
LBR
synchronization
data0
data1
datam-1
. . .
HBR