Non Data Aided parameter estimation for Multi-User ARGOS receivers

Abstract

In this paper, parameter estimators are analyzed in the context of Successive Interference Cancelation (SIC) receivers for the ARGOS system. A Non Data Aided (NDA) feed forward estimator is proposed for the amplitude and the carrier phase parameters. Time delays are assumed to be known. A Window Accumulator (WA) is used to reduce the influence of the additive noise. In the presence of frequency offset, the window length L cannot be chosen arbitrarily large but an optimal length Lopt can be determined. However, because the estimator induces a different optimal length for each parameter, a trade-off must be made. We show that a window length of around 35 samples induces mean square errors (MSEs) lower than 0.012 for both parameters. The MSE of the proposed estimator is also compared to the Modified Cramér Rao Bound (MCRB).

A parallel software-defined ultra-low-power receiver for a satellite message forwarding system

“…The authors analyze the results by the bit error rate (BER) obtained by the presented algorithms. For the same system, Fares et al [17] compares the ML detector with the SIC receiver and analyzes the parameter estimation for this receiver. The algorithm chosen for this work has less computational complexity and less use of memory resources.…”

A multiuser decoder based on spectrum analysis for the Brazilian Environmental Data Collecting System

“…Although Escrig et al 15 does not investigate the problem of estimating the frequency, time, phase, and amplitude parameters, it refers to works that address this problem. One of those is Fares et al, 16 which presents the problem of estimating the amplitude and frequency parameters of a signal in the context of SIC receiver for Argos‐2 and proposes an estimator for those. However, practical implementations of Escrig et al 15 and Fares et al 16 are complex, and its use greatly increases the computational and memory requirements of the system.…”

“…One of those is Fares et al, 16 which presents the problem of estimating the amplitude and frequency parameters of a signal in the context of SIC receiver for Argos‐2 and proposes an estimator for those. However, practical implementations of Escrig et al 15 and Fares et al 16 are complex, and its use greatly increases the computational and memory requirements of the system. Other type of solution to solve the multiple access interference is presented in Zhou et al 2 and Zhou and van der Veen, 17 where an AIS receiver for a LEO satellite using blind beam former prior to a bank of receivers with single‐user bit detection is proposed.…”