What is SIR?
SIR is the Signal-to-Interference Ratio – the ratio of the energy in dedicated physical control channel bits to the power density of interference and noise after dispreading.
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What is the processing gain for 384 Kb/s service?
ReplyDeleteAnswer:- =10*Log(3840/384)
=10*log (10)
=10*1
=10
How much power usually a NodeB is allocated to control channels?
ReplyDeleteAnswer - The power allocated to control channels may depend on equipment vendor
recommendation. Typically no more than 20% of the total NodeB power is allocated
to control channels, including CPICH. However, if HSDPA is deployed on the same
carrier then the total power allocated to control channel may go up to 25 to 30%
because of the additional HSDPA control channels required
How many slots are there in a WCDMA Frame? How big is a frame in ms. how
ReplyDeletemany chips are there in a slot?
Answer: - WCDMA Frame is 15 slots wide. It is 10ms in length. There are 2560
chips in one slot.
Chip rate is 3840 Kc/s
Length of frame = 10 ms
Number of chips in a frame = 3840 *10=38400 chips
Number of chips in a slot = 38400/15= 2560 chips.