In this paper, we analyze the performance of two low-complexity uniform power loading with reduced-overhead orthogonal frequency division multiplexing (OFDM) schemes over Rayleigh fading channels. In the first feedback scheme, the receiver feeds back to the transmitter the channel gains and the indices of the best M subchannels; while for the second feedback scheme, the receiver feeds back only the indices of the best M subchannels. In both schemes, the available power budget is equally distributed over the best M subchannels. We derive closed-form expressions for the capacity and the outage capacity of the first and second schemes, respectively. Numerical results show that there is an optimal number of the best subchannels, M, that maximizes the achievable capacity and it depends on the system parameters.
|Journal||2015 IEEE 82nd Vehicular Technology Conference (VTC2015-Fall)|
|Publication status||Published - 28 Jan 2016|
|Event||2015 IEEE 82nd Vehicular Technology Conference (VTC2015-Fall) - Boston, United States|
Duration: 6 Sep 2015 → 9 Sep 2015
- Order Statistics
- Rayleigh fading
- reduced feedback
- uniform power loading.