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This paper proposes a scheme of continuous phase modulation (CPM) receivers using frequency domain equalization and conventional parallel and serial CPM receiver structures. Frequency domain equalizers for CPM block transmissions provide spectral and power efficient wireless communications with less complexity than conventional time-domain processing receivers over frequency selective fading channels...
A voice conversation quality over IP networks is mainly affected by the end-to-end delay and the packet-loss rate. Various delay channel environment can cause the early/late arrival packet loss without actual packet loss. To overcome time-variant dynamics of transmission channels for IP telephone services, an adaptive playout-buffer scheduling is proposed. Previous playout-buffer schedulers focused...
Clients have still hesitated to switch conventional phone service with voice over IP networks (VoIP) service because VoIP service providers are not successful in providing consistent quality during a call. The uncertainness of IP networks, the legacy of packet-switched networks, makes it hard to predict service quality and demands real-time based monitoring. In this paper, we propose a prediction...
Multi-mode power loading is an attractive power loading technique since it avoids iterative procedures and periodic updates of a threshold value in order to find the best power loading configuration. Simultaneously, multi-mode power loading achieves comparable spectral efficiency to optimal waterfilling with full channel state information (CSI) using only N feedback bits, where N is the number of...
In this paper, an adaptive grouped-subcarrier allocation algorithm using comparative superiority is proposed for the enhancement of system capacity and its simple implementation in a multiuser OFDM system. Since the computational complexity of the optimal subcarrier allocation algorithm based on the each subcarrier is extremely high, various sub-optimal algorithms have been developed for the realization...
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