Robert L. Olesen

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— A salient advantage of single carrier frequency division multiple access (SC-FDMA) is low peak-to-average power ratio (PAPR) which is lower than that of OFDMA. Precoding using transmit beamforming (TxBF) is a MIMO spatial multiplexing method that increases the data throughput significantly. However, when applied to SC-FDMA, it increases the PAPR. In this(More)
— I/Q imbalance is one of the major concerns in the design of direct-conversion front-end receivers in high data rate wireless networks. To address the challenge, various I/Q imbalance estimation and compensation algorithms have been proposed in the literature. In this paper, we propose a blind cyclostationary method based estimation and compensation of(More)
Zero-forcing (ZF) beamforming, an efficient technique for multiuser MIMO systems, requires perfect channel state information to be available at the base station. This is achieved by quantizing the channel and feeding back the information with a limited number of bits. A challenge of this method is the large downlink signaling overhead, which is due to the(More)
Carrier frequency offset (CFO) effects on the packet error rate performance of a proposed IEEE 802.11 n WLAN standard are investigated. With the maximum CFO (40 ppm) requirement specified by the standard, simulation results show that performance degradation is limited to within 1.5 dB for various TGn channels, modulation and coding schemes, transmit antenna(More)