Title :
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
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;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1464741
