A comparison of OFCDM and segmented-OFDM in broadband MIMO downlink channel

The spectral efficiencies (bps/Hz/cell) of OFCDM and segmented-OFDM for MIMO channels were evaluated subject to the outage probability. The systems apply the 2×2 space-time block coding (STBC) to reduce the fade margin. The performance comparison involved: (1) wireless link-level simulation for the fourth-generation (4G) mobile communication system and (2) system-level simulation in a multi-cell environment. The evaluating scenarios were the typical one with a moderate velocity, and severe conditions with velocities of more than 200 km/h. We point out the effectiveness of the segmented-OFDM for the broadband wireless access in the downlink and the possibility of a frequency reuse factor of 1.