Efficient Frequency Domain Zadoff-Chu generator with application to LTE and LTE-A systems

Author

de Figueiredo, Felipe A. P. ; Mathilde, Fabiano S. ; Cardoso, Fabbryccio A. C. M. ; Vilela, Rafael M. ; Miranda, Joao Paulo

Author_Institution

DRC (Convergent Networks Dept.), CPqD R&D Center, Campinas, Brazil

fYear

2014

fDate

17-20 Aug. 2014

Firstpage

1

Lastpage

5

Abstract

This paper presents a configurable and optimized hardware architecture for computing Zadoff-Chu (ZC) complex sequences in the Frequency Domain (FD). It is a hardware-efficient and accurate architecture for computing ZC sequences in real-time. The architecture is mainly based on the CORDIC algorithm for computing complex exponentials using only shift and add operations. Due to transformations applied to the Zadoff-Chu equation it is possible to eliminate the use of multipliers with non-constant terms. This hardware architecture is employed by the Physical Random Access Channel (PRACH) in LTE and LTE-A systems during the reception and detection of random access preambles. Its main advantage is that it eliminates the need for storing a large number of long complex ZC sequences.

Keywords

Long Term Evolution; frequency-domain synthesis; radio reception; wireless channels; CORDIC algorithm; LTE application; LTE-A systems; Long Term Evolution; PRACH; Zadoff-Chu equation; complex ZC sequences; frequency domain; hardware architecture; physical random access channel; random access preambles; shift and add operations; Base stations; Equations; Field programmable gate arrays; Generators; Hardware; Table lookup;

fLanguage

English

Publisher

ieee

Conference_Titel

Telecommunications Symposium (ITS), 2014 International

Conference_Location

Sao Paulo

Type

conf

DOI

10.1109/ITS.2014.6947990

Filename

6947990