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In this paper, in order to improve the efficiency of wireless resource utilization, power control and subcarrier allocation are optimized jointly in a three-node symmetric cooperation orthogonal frequency-division multiple access uplink system. Equivalent direct channel gain is introduced to simplify relay links. Transmission mode selection strategy guarantees an optimal operation mode on the subcarriers...
In this paper, we develop a blind carrier frequency offsets (CFOs) estimation algorithm for multiusers in the uplink of an orthogonal frequency-division multiple-access (OFDMA) system, where the base station equipped with uniform linear array (ULA). Due to the ULA at base station, different users could be separated by their spatial information. So unlike existing blind alternatives, which are subject...
A novel closed-form subspace-based blind CFO estimation approach for MIMO-OFDM systems is proposed. Our key observation is that the CFO information is redundant in spectrum structure. By allocating null carriers equispaced at the transmitter and downsampling and collecting the received blocks from all antennas at the receiver, the dimension of parameter space is greatly reduced compared with previous...
Synchronization is an important issue in orthogonal frequency-division multiplexing (OFDM) systems including symbol timing and carrier frequency offset (CFO) estimation. In this paper, we derive a new subspace based CFO estimation method exploiting the cyclic prefix (CP) samples which are not disturbed by the preceding OFDM symbol. As a special and more practicable case, we provide an adaptive joint...
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