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Extra resources for AN 08-10-112 BC-348-J,N,Q Radio Receiver (maintenance)
The transmit power has to be adjusted autonomously by the UE. The principle procedure is, that the UE starts to transmit with some initial power, which is derived from a pilot based channel estimate. The UE subsequently retransmits the data with increasing power until an acknowledgment from the corresponding cell is received. Closed-Loop Power Control Closed-loop power control is applied for adapting the power levels of DCH, E-DCH (and DSCH). It is used to adapt the transmit power to the time varying radio link conditions.
In UL the signal transmitted by the UE is decoded by each of the associated cells. The separate communication paths are generally considered as the branches of a connection in SHO. In softer handover the received signals from the different branches are combined within one receiver (in the UE for DL and in the Node B for UL respectively). The UE is referred to as being in soft handover, but not softer handover, if the UE communicates with multiple cells of different Node Bs. e. the signals from the different cells are combined in the receiver of the UE.
1,1,-1,-1] [1,1,-1,-1,-1,-1,1,1]  SF=1 [1,-1,1,-1,1,-1,1,-1] [1,-1,1,-1] ... [1,-1,1,-1,-1,1,-1,1] [1,-1] SF=2 [1,-1,-1,1,1,-1,-1,1] ... 4: Tree of orthogonal spreading codes The signals from different transmitters are on top of the spreading multiplied with scrambling codes. Scrambling codes are pseudo-random bit sequences which have the same bit rate as the signals they are multiplied with. They are known to both transmitter and receiver. In this way the signals from different transmitters can be separated, although they potentially use identical channelization codes and transmit unsynchronized.
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