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In this paper we consider the evaluation of nonlinear distortion effects on the downlink transmission of systems employing OFDMA (orthogonal frequency division multiple access) signals. Our results allow an analytical spectral characterization of the transmitted signals, as well as the computation of nonlinear interference levels on the received signals. It is shown that the set of subcarriers allocated...
This paper presents experimental results on the throughput performance of IP and physical layer packets in the evolved UTRA uplink using single-carrier FDMA radio access. The IP packet performance is investigated using a base station and four sets of user equipment, in which medium access control (MAC) layer processing and key packet radio access techniques in the physical layer such as frequency...
In this paper, we propose a fast prediction method adapted to multi-user turbo detection based on linear filtering and successive interference cancellation. Using Gaussian approximation, compression and quality tables, the method provides for each user its expected transmission quality at each iteration according to the linear filter of the multi-user detector (MMSE or Matched Filter) as well as its...
In LTE uplink, the slow varying path gain and shadowing are compensated by the standardized open loop power control (OLPC). Further optimization of the system performance can be done via closed loop power control commands. In this contribution, it is shown that using such commands to control the interference caused by users to the system, it is possible to achieve a gain in the order of 20% on the...
The performance of applications in wireless networks is partly dependent upon the link configuration. Link characteristics varies with frame retransmission persistency, link frame retransmission delay, adaptive modulation strategies, coding, and more. The link configuration and channel conditions can lead to packet loss, delay and delay variations, which impact different applications in different...
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