Joint carrier recovery and adaptive equalization for high-order QAM

Author

Tian, Junhua ; Shen, Bo ; Li, Zheng ; Su, Jianing ; Zhang, Qianling

Author_Institution

State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China

fYear

2005

fDate

23-26 May 2005

Firstpage

928

Abstract

An improved joint carrier recovery and adaptive equalization algorithm for high-order quadrature amplitude modulation (QAM) is proposed. It combines a dual-mode adaptive equalization algorithm and an optimal frequency/phase detection algorithm which operate in an optimal four-step sequence. Computer simulation and FPGA implementation demonstrate that this algorithm is robust even under low signal-to-noise ratio (SNR) and is especially suitable for high-order QAM receivers. The algorithm can acquire a carrier frequency offset up to 300 kHz at 256QAM over typical coaxial cable channels.

Keywords

adaptive equalisers; coaxial cables; field programmable gate arrays; quadrature amplitude modulation; receivers; signal detection; FPGA; SNR; carrier recovery; coaxial cable channels; dual-mode adaptive equalization algorithm; frequency detection; high-order QAM; high-order quadrature amplitude modulation; optimal frequency/phase detection algorithm; signal-to-noise ratio; Adaptive equalizers; Coaxial cables; Decision feedback equalizers; Distortion; Field programmable gate arrays; Least squares approximation; Phase detection; Phase frequency detector; Quadrature amplitude modulation; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on

Print_ISBN

0-7803-8834-8

Type

conf

DOI

10.1109/ISCAS.2005.1464741

Filename

1464741