Title :
Performance Analysis and Training Power Allocation for Channel Estimation of MIMO/OFDM Systems Using Superimposed Training
Author :
Zhang, Han ; Dai, Xianhua
Author_Institution :
Dept. Phys. & Telecommun. Eng., South China Normal Univ., Guangzhou, China
Abstract :
This paper deals with the problem of channel estimation for multiple-input multiple-output/orthogonal frequency-division multiplexing (MIMO/OFDM) systems based on superimposed training (ST). Channel coefficients are firstly estimated by judicious designing superimposed pilot sequences across different users. Then, we analyze the channel estimation performance and derive a closed-form expression for estimation variance. For wireless communications with a limited power, we optimize the ST power allocation by maximizing the lower bound of the average channel capacity. Illustrative simulation examples are provided.
Keywords :
MIMO communication; OFDM modulation; channel estimation; MIMO-OFDM systems; average channel capacity; channel coefficients; channel estimation; estimation variance; multiple-input multiple-output systems; orthogonal frequency-division multiplexing; power allocation; superimposed pilot sequences; superimposed training power allocation; wireless communications; Channel estimation; Estimation; Interference; MIMO; OFDM; Signal to noise ratio; Training;
Conference_Titel :
Wireless Communications Networking and Mobile Computing (WiCOM), 2010 6th International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-3708-5
Electronic_ISBN :
978-1-4244-3709-2
DOI :
10.1109/WICOM.2010.5600136
