A. Polydoros

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The implementation and performance of wide-band detectors for direct-sequence and time-hopping spread-spectrum waveforms in the presence of additive white Gaussian noise are considered in this paper. Of interest here is the performance penalty incurred when going from optimal to suboptimal detector structures. In both cases, performance is quantified by(More)
In the WIND-FLEX project a very high bit rate, up to 100 Mbit/s payload at network level, adaptive modem architecture for wireless indoor communications is to be designed, developed and demonstrated. In this paper we describe potential WIND-FLEX scenarios and justify the adopted joint adaptive strategies in baseband, RF/IF and network architectures aiming(More)
Flexibility is an increasingly important aspect of radio modern design. In this paper, flexibility within the physical (PHY) layer in general, and the forward error correction (FEC) component in particular, is examined in detail. Following a discussion of the need for flexible modern code designs that exhibit universally good performance across a wide range(More)
A low-complexity, decision-directed, iterative scheme is proposed for severe phase noise mitigation in OFDM modulation over frequency-selective as well as flat channels. The proposed approach relies on two modeling steps: first, an alternative model formulation in the time domain; second, a maximum likelihood (ML)-inspired estimator which incorporates(More)
A new approach is proposed on the design of pulse-shaped multicarrier systems that are robust to time and frequency selective channels which are known to limit the performance of conventional multicarrier schemes. In contrast to proposed approaches that result in inefficient bandwidth utilization, a tight packing of the subcarriers in the time-frequency(More)
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