Title :
Architecture design of a fast feed-forward blind equalizer with joint generalized multilevel modulus and low-cost soft decision directed scheme for cable modem receiver
Author :
Hu, Hao-Jun ; Hsu, Wan-Ning ; Fan, Chih-Peng
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Hsing Univ., Tai-chung, Taiwan
Abstract :
An architecture design of a fast feed-forward blind equalizer with a two-stage generalized multilevel modulus algorithm (GMMA) and low-cost soft decision-directed (SDD) scheme is developed for high-order QAM cable receivers on broadcasting downstream cable channels. The proposed fast blind equalization scheme uses a two-stage convergence strategy. Compared with the previous GMMA+SDD method, the low-cost SDD based scheme without division has the same equalization performances. At the SDD mode, the proposed low-cost exponential computation is realized by the pure arithmetic circuits without using any look-up-table, and the accuracy with the proposed exponential design is better than that with the traditional Taylor expansion method. On the wired cable channel at 64, 256, and 1024QAM modes, the proposed low-cost blind equalization architecture has a faster convergence speed than previous blind methods. The proposed low-cost scheme also achieves a smaller MSE than the other methods at the same signal-to-noise ratio (SNR).
Keywords :
blind equalisers; cables (electric); convergence; modems; quadrature amplitude modulation; table lookup; television broadcasting; 1024 QAM mode; GMMA-SDD method; cable high-order QAM cable receiver; cable modem receiver; convergence speed; downstream cable channel broadcasting; fast feedforward blind equalizer; joint generalized multilevel modulus; look-up-table; low-cost SDD based scheme; low-cost soft decision directed scheme; signal-to-noise ratio; traditional Taylor expansion method; two-stage convergence strategy; wired cable channel; Blind equalizers; Cable TV; Convergence; Cost function; Hardware; Quadrature amplitude modulation; blind equalizer; cable receiver; feed-forward scheme; high-order QAM; low-cost architecture;
Conference_Titel :
TENCON 2011 - 2011 IEEE Region 10 Conference
Conference_Location :
Bali
Print_ISBN :
978-1-4577-0256-3
DOI :
10.1109/TENCON.2011.6129151