Title :
A novel CQI calculation scheme in LTELTE-A systems
Author :
Chen, Xi ; Yi, Haike ; Luo, Hanwen ; Yu, Hui ; Wang, Hailong
Author_Institution :
Dept. of Electron. Eng., Shanghai Jiao Tong Univ., Shanghai, China
Abstract :
We propose a novel Channel Quality Indicator (CQI) calculation scheme in LTELTE-A systems. SNR-CQI mapping scheme, as well as SINR-CQI mapping scheme, is extensively studied in previous works. However, these kinds of CQI mapping schemes always provide imprecise results in fading channels, since all of them ignore the channel quality degeneration caused by other factors. In this paper, we further improve CQI calculation by considering the impact of multipath delay spread. The calculation scheme is presented in details. In order to guarantee the converge of CQI calculation, a Block Error Ratio (BLER) based converge algorithm is proposed. Simulations show that our calculation scheme can select CQIs more precisely, and achieve better throughput performance than traditional schemes. Furthermore, our scheme converges much faster than previous schemes.
Keywords :
Long Term Evolution; error statistics; fading channels; multipath channels; CQI calculation scheme; LTE-LTE-A system; SINR-CQI mapping scheme; block error ratio based converge algorithm; channel quality degeneration; channel quality indicator calculation scheme; fading channel; Channel estimation; Channel models; Delay; Encoding; Modulation; Signal to noise ratio; Throughput; CQI calculation; LTELTE-A; feedback;
Conference_Titel :
Wireless Communications and Signal Processing (WCSP), 2011 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4577-1009-4
Electronic_ISBN :
978-1-4577-1008-7
DOI :
10.1109/WCSP.2011.6096767
