By J. C. Bic, E. Bonek
An in-depth assessment of the common cellular Telecommunication approach (UMTS) for telecommunications teachers, researchers, and communications experts.
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The spreading codes for the CPICH and the DPCHS are taken from a set of OVSF codes, thereby maintaining mutual orthogonality between the CPICH and DPCHS. These channels are further scrambled by a cell-specific scrambling code with a 10msec repetition period (= 38,400-chip duration), which is equal to the data frame 26 Improvements in W-CDMA Figure 7. Forward link frame structure of CPICH and SCH. length. The PSC for the primary-SCH is common to all cell sites and the ssc for the secondary-sch denotes the group index into each of which the scrambling codes are grouped beforehand.
Inner loop operation is performed as follows. In the Rake combiner, the despread signals associated with resolved paths are multiplied by the complex conjugate of their channel gain estimates and summed. Therefore, if the SIR measurement is done after Rake combining, it is affected by the channel estimation error. In this paper, instead of measuring the SIR after Rake combining, we apply the SIR measurement method proposed in [14, 15], in which, first, the SIR on each resolved path is measured and then, the SIRS of all the resolved paths are summed to obtain the SIR (which is equivalent to the one at the output of the Rake combiner).
Coherent Rake combining (Rake time diversity) PSA coherent detection is used for both the reverse and forward links [16, 17]. The block diagram of the PSA coherent Rake combiner is illustrated in Figure 11 (a). The received multipath signals are despread by the MF and resolved into L-multipath components of transmitted quaternary phase shift keyed (QPSK) modulated data that are received via different propagation paths with different delay times. , L -1) using despread signal r l (n, k), as where ξl(k) represents the channel estimates.
Advances in UMTS Technology by J. C. Bic, E. Bonek