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Since the out-of-band (OOB) power suppression of Orthogonal Frequency Division Multiplexing (OFDM) has been an essential topic for various wireless communication applications such as Cognitive Radio (CR) systems, in this paper, two existing precoding techniques are investigated. Then a combined approach which properly adjusts the matched code rates of these(More)
In this paper, we compare three filter bank multicarrier (FBMC) techniques, i.e., Orthogonal Frequency Division Multiplexing (OFDM), OFDM-Offset Quadrature Amplitude Modulation (OFDM-OQAM) and wavelet packet modulation (WPM), based on multiple criteria, including bandwidth efficiency, computational complexity, latency, out-of-band emission, peak-to-average(More)
In this paper, we study carrier frequency offset estimation and correction for uplink multi-user MIMO (UL MU-MIMO) for Wi-Fi, where distributed stations (STAs) send multiple data streams to a common access point (AP) with multiple receive antennas. We provide a description of the proposed system, and propose a three-step approach using a joint phase(More)
Orthogonal Frequency Division Multiplexing (OFDM) systems suffer from large out-of-band emission (OOBE). As one of the approaches to suppress the OOBE, the precoding technique is able to achieve significant OOBE suppression with a small spectral efficiency loss and does not depend on the input data. In this paper, a low-complexity individual precoded OFDM(More)
Orthogonal frequency division multiplexing (OFDM)-based cognitive radio (CR) systems suffer from the large out-of-band emission (OOBE) that may interfere with other users. Since most existing OFDM OOBE suppression schemes are derived on the base of an original OFDM system without any other scheme, we first propose a generalized OFDM framework that is(More)
This letter provides an analysis of the saturation throughputs of the individual stations (STAs) in a distributed coordination function (DCF) network. Compared with the previous DCF models, our new proposed model is suitable for more general environments where the frame error rates (FERs) are different depending on the transmitting STAs and the numbers of(More)
Validated by Mote Carlo simulations, a 2D-Markov chain model is proposed for analyzing the throughput of a simplified LTE system. User scheduling strategy for maximizing the sum throughput in a heterogeneous network consisting of LTE and WiFi systems is obtained using the proposed LTE's 2D-Markov chain model and a previously developed WiFi's 2D-Markov chain(More)