Title :
Water-filling capacity analysis in large MIMO systems
Author :
Yi Lu ; Wei Zhang
Author_Institution :
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Sydney, NSW, Australia
Abstract :
In this paper, we study a water-filling power allocation scheme in large M × N MIMO systems over flat Rayleigh fading channels. It is shown that when M = N with sufficiently large M, the channel capacity of the water-filling scheme almost converges to a constant regardless of channel randomness. Moreover, it is proved that for the water-filling scheme, the required channel information at the transmitter in large MIMO systems can be greatly reduced without capacity loss. When M ≫ N or M ≪ N, it is shown that allocating equal power on each eigenchannel is almost as optimal as water-filling power allocation scheme in channel capacity.
Keywords :
MIMO communication; Rayleigh channels; channel allocation; channel capacity; radio transmitters; channel information; channel randomness; eigenchannel; flat Rayleigh fading channel capacity; large MIMO system; transmitter; water-filling capacity analysis; water-filling power allocation scheme; Approximation methods; Channel capacity; Convergence; MIMO; Resource management; Transmitters; Wireless communication; Massive MIMO; capacity analysis; water-filling;
Conference_Titel :
Computing, Communications and IT Applications Conference (ComComAp), 2013
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4673-6043-2
DOI :
10.1109/ComComAp.2013.6533633