Carrier aggregation

Channel selection schemes for CA systems taking into account the optimal values for the training length and power, the number of the probed sub-channels and the feedback threshold such that the sum rate is also important for optimal achievable capacity.

However, the complexity from a radio frequency (RF) point of view is increased in the case inter-band carrier aggregation.

10 any two channels (of possibly different bandwidths) may be aggregated and be assigned to a single user.

Since LTE Release 10 up to 5 component carriers may be aggregated, allowing for transmission bandwidths of up to 100 MHz.

[1]: p.113  Using five aggregated component carriers, MIMO and 256QAM allows theoretical data rates of up to 2 gigabits per second.