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

fYear

2011

fDate

9-11 Nov. 2011

Firstpage

1

Lastpage

5

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/WCSP.2011.6096767

Filename

6096767