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In this paper, we propose a method to find an optimal correction value for multiple carrier frequency offsets (CFO) compensation, where two received signals have different path gains, in orthogonal frequency division multiplexing (OFDM) systems. Multiple CFOs are occurred when two spatially-separated transmitters are used to transmit the same signal simultaneously. In this case, the sidelobes of the...
In this paper, we propose an adaptive carrier frequency offsets (CFOs) compensation scheme for uplink orthogonal frequency division multiple access (OFDMA) systems. In OFDMA receivers, CFOs break the orthogonality among the subcarriers and cause interchannel interference (ICI) and multi-user interference, which are the key impairment factors in OFDMA systems. In the proposed method, we compensate...
In this paper, we propose a method to compensate the effects of multiple carrier frequency offsets for orthogonal frequency division multiplexing (OFDM) systems when the received signals come from two spatially separated transmitters. The scheme estimates a proper compensation value with previously estimated carrier frequency offsets caused by the two transmitters. And then compensates the received...
In this paper, we propose a multiuser interference cancellation scheme for orthogonal frequency division multiple access (OFDMA) uplink systems. In the scheme, two steps of compensation and cancellation in time and frequency domains, respectively, are applied. In the frequency domain, we only consider the interference from both adjacent sides of the band to reduce the computation complexity and parallel...
In this paper, an interchannel interference (ICI) cancellation method is proposed for multiple frequency offsets in orthogonal frequency division multiplexing (OFDM) systems. When signals are received from different transmitters simultaneously like in a relay communication, multiple frequency offsets may appear at the receiver. This causes interchannel interference (ICI) and severe performance degradation...
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