Lei Zhang Yong Shang Yuxin Cheng Haige Xiang Improved turbo equalization based on soft ISI cancellation. 1812-1820 2009 89 Signal Processing 9 http://dx.doi.org/10.1016/j.sigpro.2009.03.019 db/journals/sigpro/sigpro89.html#ZhangSCX09