Abstract
Transmit power control (TPC) is used in high speed uplink packet access (HSUPA) to compensate for the near far effect which degrades system performance. However, its use in joint application with turbo coding, and hybrid automatic repeat request (Hybrid-ARQ) is very prohibitive and time consuming. In this article, we propose a simplified simulation methodology for power controlled HSUPA with Hybrid-ARQ Chase combining considering the effect of channel estimation on the system performance. The proposed method was tested on Rake and chip-level linear minimum mean squared error (LMMSE) receivers. Simulation results show that the CPU time taken to reach the required performance is significantly reduced. Moreover, when the channel estimation is taken into account with an important number of pilot symbols, the system performance is close to that obtained with perfect channel acknowledgement (PCA).
Highlights
Transmit power control is necessary for high speed uplink packet access (HSUPA) system to reach the expected quality of service
The signal to interference-plus-noise ratio (SINR) at the output of the linear minimum mean squared error (LMMSE) filter is given by SINRLMMSE(h /h) = Ec
Channel estimation effect on fast performance prediction (FPP) Having shown the accuracy of FPP simulator, computer simulations are run to assess the impact of noisy channel on this simulator considering Hybrid-ARQ Chase combining and Transmit power control (TPC)
Summary
Transmit power control is necessary for high speed uplink packet access (HSUPA) system to reach the expected quality of service It is jointly performed with Hybrid-ARQ in which ARQ technique is combined with turbo coding. The BLER is computed by simulating HSUPA technologies, according to 3GPP (3rd Group Partnership Project), with Monte-Carlo method [1]. Iterative processes such as turbo decoding and transmitted power adjustment make this simulation very prohibitive and time consuming. For HSUPA performance prediction over block fading frequency selective channel, FPP makes use of the analytical SINR with previously. These tables are built with a turbo coded HSUPA simulator over AWGN channel.
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