CDMA - Explain following forward link channels in CDMA system: a.)
Pilot Channel b.) Sync. Channel - Jan 15, 2011 at 15:45 PM by
Explain following forward link channels in CDMA system: a.) Pilot Channel b.)
A forward link channel which is a base to mobile that modulates only by the
pilot PN. It spreads common codes to all signals transmitted from a given base
Several critical important functions are provided by the pilot channel for
forward links in IS-95 systems
The pilot channel modulation facilitates the process of time synchronized
replica generation at the receiver of the PN spreading sequences. These are
utilized at the transmitter for modulating the synchronization, paging and
traffic channels. These are transmitted from the same base station.
A base station transmits a Sync-Channel that spreads with Walsh code 32.
The frame of synch channel is 80/3ms long with frame boundary is aligned to the
Sync channel transmits a single message continually, called Sync Channel
The Sync Channel Message contains network information, including the PN offset
that is used by the Base Station sector.
The length and content of the message is dependent on the P_REV.
The message transmission rate is 32 bits / frame.
The message is encoded to 128 symbols
The message yielding rate is 1200 bits / s.
HSPA is a combination of 2 mobile telephony protocols – High Speed Downlink
Packet Access and High Speed Uplink Packet Access, HSPA improves the
performance of existing WCDMA protocols...............