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Reduced feedback schemes play a critical role in orthogonal frequency division multiplexing-based cellular systems because they facilitate scheduling and rate adaptation by the base station (BS) while reducing the number of subchannels for which channel state information is fed back by the users. We address the problem of reliable transmission even on subchannels that are fed back by a few users due...
The interfering system detection and mitigation techniques are important topics for spectrum sharing among various radio systems. And also the interfering band estimation technique in shared wide frequency band is significant to help the interference mitigation technique. In this paper, an interfering band estimation technique is proposed. In order to detect the interfering band, the multi-band pulse...
Orthogonal frequency division multiplexing (OFDM) is a technique widely used for wireless communication applications. All the subcarriers are orthogonal to each other in OFDM systems. However, carrier frequency offset (CFO) may distort the orthogonality of the subcarriers and it must be estimated and compensated to maintain the system performance. A blind carrier frequency offset estimator based on...
We propose a null subcarrier based carrier frequency offset (CFO) estimation technique for the uplink orthogonal frequency division multiple access (OFDMA) communication system. Here each user may experience a different CFO relative to the base station. This results in a multiple parameter estimation problem. The estimation is done by minimizing a cost function that computes the energy in null subcarrier...
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