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Frequency-domain scheduling and rate adaptation have helped next generation orthogonal frequency division multiple access (OFDMA) based wireless cellular systems such as Long Term Evolution (LTE) achieve significantly higher spectral efficiencies. To overcome the severe uplink feedback bandwidth constraints, LTE uses several techniques to reduce the feedback required by a frequency-domain scheduler...
Subcarrier mapping (SCM) is an efficient way to evidently improve the average end-to-end capacity in cooperative OFDM networks. However perfect channel knowledge is required, which leads to large feedback amount of channel state information (CSI). In this paper, the uplink scenario of multi-relay OFDM cooperative networks with subcarrier mapping scheme is considered. An opportunistic relaying strategy...
Using the channel state information (CSI) at transmitter can enhance the performance of the system. From practical point of view, those algorithms that require a limited feedback, from receiver to transmitter, are very attractive. In spatially correlated channels, one method of using such a limited feedback is statistical eigen-beamforming (EBF). In this paper, assuming a limited CSI feedback, we...
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