Instantaneous Capacity of OFDM on Rayleigh-Fading Channels

Abstract

Abstract-For a power limited orthogonal frequency-division multiplexing (OFDM) system transmitting a large number N of subcarriers over a Rayleigh-fading channel, the distribution of the instantaneous capacity is shown to be approximately Gaussian. The mean and variance of the approximating distribution are derived. It is also shown that, in the limit as N ! 1, the capacity approaches a constant value equal to the capacity of the infinite-bandwidth Gaussian channel.Index Terms-Channel capacity, orthogonal frequency-division multiplexing (OFDM), Rayleigh-fading channels.

Maximizing Outage Capacity of OFDM Transmit Diversity Systems

“…We finally studied the impact of spatial correlation on SD schemes and we showed that, in order to get an effective gain, correlation between adjacent elements should be kept small when increasing the number of transmit antennas. APPENDIX A PROOFS FOR (7) AND (18) The correlation coefficient ρ m1,m2 in (7) could be computed by developing the equation and by exploiting the WSS-US condition on the channel. However, in the following we propose an alternative fast approach which also permits to easily find (18).…”

“…APPENDIX A PROOFS FOR (7) AND (18) The correlation coefficient ρ m1,m2 in (7) could be computed by developing the equation and by exploiting the WSS-US condition on the channel. However, in the following we propose an alternative fast approach which also permits to easily find (18).…”

On the Mutual Information Distribution of OFDM-Based Spatial Multiplexing: Exact Variance and Outage Approximation

“…2 In contrast to (22), however, the equivalent result from [31] is not expressed in closed form, and it requires the evaluation of infinite series of incomplete gamma functions.…”

“…1, we compare the analytical variance expression (9) , and the SNR is set to 10 dB. In all cases, we see a pre-2 Note that this expression was not explicitly stated in [31]. It can however be obtained by following the derivation of (47) and using [31, eqs.…”

Performance Analysis of Adaptive MIMO OFDM Beamforming Systems

“…For example, similar approaches in [1] and [2] have led to results on the capacity of MIMO OFDM systems and the BER of SISO OFDM systems. Applications of this work can be found in both performance analysis and design.…”