DPCCH


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AcronymDefinition
DPCCHDedicated Physical Control Channel
DPCCHDedicated Physical Control Channel (also seen as DPCC)
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The DPCCH channel consists of pilot symbols, transmit power-control (TPC) bits and transport format combination indicator (TFCI) bits (please note that TFCI is optional and is not used for fixed rate services).
The only difference is that the DPDCH and DPCCH are not time multiplexed.
Similarly, m DPCCH bits are mapped onto m BPSK (Binary Phase Shift Keying) symbols which are spread using a spreading code [C.sub.j] of length [L.sub.c] to produce 38 400 chips.
Since a spreading factor of 64 was selected, the effective data rate used in our model was 96 kbit/s (only pilot channel consisting of eight symbols per slot was considered for DPCCH).
Although measuring EVM for a signal with a single DPCCH (or other simple channel configuration) may be useful, in general the overall modulation quality of the transmitter for any channel configuration is the point of interest.
In order for the measurement to identify the active channels and despread the channels correctly, it must synchronize to the DPCCH pilot sequence.
The channel configuration is the 12.2 kbps uplink reference measurement channel, which consists of a DPDCH and a DPCCH. The DPCCH is -5.46 dB lower than the DPDCH.
An example of a composite EVM measurement on a signal with the DPCCH and three DPDCHs is shown in Figure 2.
Figure 4 shows the code domain power display for a signal with a DPCCH and 3 DPDCHs.
As shown in Table 1, the UL DPCCH can have different slot structures.
It is particularly important to verify the bits for the different DPCCH fields, as shown in Figure 12.