Two channels of WCDMA

• Forward WCDMA Channel

• Reverse WCDMA channel

Forward WCDMA Channel

• The forward channel is also called as transport channel

• A forward WCDMA channel consists of a pilot channel, a synchronous channel, paging channels and multiple forward traffic channels.

• Every channel is orthogonally spread by the suitable orthogonal function and spreads by a quadrature pair of P sequence

• The output of all channels are added together and sent to the modulator

• The BS can operate in asynchronous fashion

• The pilot signal is transmitted by BS to enable MS for clock recovery

• The synchronous channel is transmitted by a base station to enable the MS to obtain frame synchronization of WCDM signal

• The paging channel is transmitted by a BS to enable MS

• The forward traffic channel is transmitted by a base station to enable the MS to carry void or data traffic

Reverse WCDMA channel

• In reverse traffic channel information bits and signalling information bits are processed separately

• The channel multiplexing is done in modulator WCDMA