Clearly the benefits of
receive diversity are substantial.
FIGURE 7.140 RAKE, Type 2, and Type 3 throughput performance results in a VA120 channel.
H-Set 6, QPSK,VA120 Channel
0
500
1000
1500
2000
2500
3000
3500
4000
??“10 ??“9 ??“8 ??“7 ??“6 ??“5 ??“4 ??“3 ??“2
Ec/Ior (dB)
Tput (kbps)
RAKE, QPSK,VA120
Type 2, QPSK, VA120
Type 3, QPSK, VA120
A point worthy of mention is that HS-DSCH doesn??™t operate in soft-handoff scenarios, and as
such, this simplifies the equalizer structure (i.e., lower delay spread, etc.). We continued with the performance
comparisons, except this time in the PB3 channel model. These simulation results are
shown in Fig. 7.141.
450 CHAPTER SEVEN
FIGURE 7.141 RAKE, Type 2, and Type 3 throughput performance results in a PB3 channel.
H-Set 6, 16-QAM, PB3 Channel
RAKE, 16-QAM, PB3
Type 2, 16-QAM,PB3
Type 3, 16-QAM,PB3
0
500
1000
1500
2000
2500
3000
3500
4000
Tput (kbps)
??“10 ??“9 ??“8 ??“7 ??“6 ??“5 ??“4 ??“3 ??“2
Ec/Ior (dB)
The implications of such improvements are polyfold. In one dimension, the UE can benefit from
the additional data rate supplied, hence providing the user with faster download times and lower latencies.
In another dimension, the network providers can use less transmit powers.
Pages:
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732