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By J. C. Bic, E. Bonek

An in-depth evaluation of the common cellular Telecommunication approach (UMTS) for telecommunications teachers, researchers, and communications specialists.

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3) dB compared to that using convolutional coding without (with) antenna diversity reception. Although the superiority of turbo coding to convolutional coding was confirmed in an actual multipath fading channel, this difference was decreased compared to the laboratory experiments assuming a fixed delay time for each path using a fading simulator, Figure 13. Average BER of 64-kbps data transmission with turbo coding as a junction of mobile transmit power. Field experiments. 0 dB. This abatement in the improvement with antenna diversity reception indicated that in an actual fading channel in the field experiments, the impact of path search for Rake combing and SIR measurement for fast TPC diminished the improvement in performance of the turbo coding due to a very low received signal power level.

SIR-based adaptive TPC with outer loop control. since we assume that the modulation phase of Np pilot symbols is π/4 radians. 667 msec. Even if the received SIRS are the same, the received quality (BLER) is not the same because the BLERS are affected by the number of paths, maximum Doppler frequency (which depends on the speed of the vehicle), and SIR measurement, etc. Therefore, the outer loop controls the targe SIR with a more gradual updating interval compared to the inner loop so that the measured BLER or BER is equal to the target value.

The BER performance with signal antenna transmission is als depicted for comparison. 0) dB without (with) antenna diversity reception. The improvement using STTD with antenna diversity reception became smaller than that without antenna diversity because the degradation of the channel estimation due to a lower Figure 19. Average BER performance infield experiment (without forward link fast TPC). Advances in UMTS technology 41 received level offset the additional diversity effect by STTD when using Rake path diversity and antenna diversity reception.

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