In this letter, we analyze the performance of a zero forcing (ZF) crosstalk canceler/precoder in vectored VDSL2. We show that there is gap between the theoretical capacity and the performance of the ZF canceler/precoder at higher frequencies and/or large number of vectored users. Unlike bounds developed to date, the tight rate approximations presented in this paper are valid over all frequency bands, even when the number of vectored users is large. Numerical results confirm the tightness of the derived approximations.
Bibliographical noteFunding Information:
Manuscript received January 04, 2012; revised February 06, 2012; accepted February 11, 2012. Date of publication February 16, 2012; date of current version March 06, 2012. This work was supported by research grants from Conexant Systems, Inc., USA, and by IIT Delhi. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Yong Liang Guan.
- Crosstalk cancellation
- Zero forcing