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The availability of channel state information (CSI) at the transmitter is crucial to multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) systems to suppress interference with precoding techniques. In a MIMO-OFDM frequency division duplex (FDD) system, the amount of CSI required by the transmitter increases linear with the number of subcarriers, and therefore becomes...
Channel estimation for an orthogonal frequency-division multiplexing (OFDM) broadband system operating with high mobility is very challenging. This is mainly due to the significant Doppler spread, inherent in a time-frequency doubly-selective (DS) channel. Consequently, a large number of channel coefficients must be estimated, forcing the need for allocating a large number of pilot subcarriers. To...
In this paper, the throughput performance of uplink Base Station (BS) cooperation in a realistic multi-cell MIMO system is evaluated. We choose LTE Release 8 as our baseline, and propose a whole implementation scheme for uplink BS cooperation. First we propose a dynamic cooperative BS selection algorithm, in which each cell-edge user will be assigned a potential cooperative BS by comparing the reception...
In this paper, a low complexity joint spreading and inverse fast Fourier transform (S-IFFT) processing for multicarrier code-division multiple access (MC-CDMA) is introduced. Using the orthogonality transformation property of IFFT, the frequency domain spreading is applied during the IFFT processing for complexity reduction. Moreover, we propose a class of low complexity architecture for the uplink...
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