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In a multi-path channel an orthogonal frequency division multiplexing (OFDM) system is very robust to frequency selective fading, but it is sensitive to the time selective fading of the mobile channel. Time selectivity of the channel causes inter-carrier-interference (ICI) in OFDM, thereby degrading the performance significantly and increasing the computational complexity of the receiver. On the other...
We investigate the behavior of the multi-carrier DS-CDMA (MC-DS-CDMA) synchronous systems based on linear detectors under different power assignment strategies in the presence of multiuser interference. We use algorithms that maximize the user throughput or minimize the bit error rate (BER). The effects of the number of nonorthogonal users, interference, channel attenuation and the used criteria are...
Power constraints are often motivated by the physical limitations of the transmitting device (battery power etc.). However, a different source of power constraints is the regulatory framework imposed by authorities such as the United States FCC. Specifically, if a frequency band is to be reused on a tight spatial schedule, then the interference created by each system must be constrained. For sensor...
Autocorrelation receiver (AcR) front-ends promise to provide a low-complexity, sub-optimal alternative to coherent reception for differentially modulated impulse radio (IR) ultra-wideband (UWB) signals (transmitted-reference (TR) systems). Due to the high processing gain of UWB-IR signals, these are normally quite robust against narrowband interference (NBI). Much of this robustness is unfortunately...
Block diagonalization (BD) is a preceding technique that eliminates inter-user interference in downlink multiuser multiple-input multiple-output (MIMO) systems. With the assumptions that all users have the same number of receive antennas and utilize all receive antennas when scheduled for transmission, the number of simultaneously supportable users with BD is limited by the ratio of the number of...
The existing reverse link inter-cell interference models for cellular CDMA systems are based upon the assumption that all mobile users have equal receiving power or controlled power disparity at the base stations they are assigned to. However, because of imperfect power control and/or the application of new signal processing techniques, in most case the receiving power demonstrates random disparity...
A space-time adaptive decision feedback (DF) multiuser receiver (MUD) for DS-CDMA systems using recurrent neural networks (RNN) is proposed for joint equalization and interference suppression. A space-time DF CDMA multiuser detection structure is presented with dynamically driven RNNs in the feedforward section and a finite impulse response (FIR) linear filter in the feedback section for performing...
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