In High-Speed Serial Interface (HSSI) IP using AC coupled configuration, due to the AC coupled configuration, it can cause unexpected issues that cannot screen fail chips. That is, external loopback test is not able to reject the fail chip, even if one of the differential positive and negative signals is abnormal status, such as pin floating or open. This paper proposes a cost effective test method can screen unexpected failure without measurement performance degradation assisted by simple circuit modification and additional test sequence.

In this letter, we implement a simplified version of the Cover van der Meulen Hajek Pursley (CMHP) coding originally characterized by Wajcer, Wiesel, and Shamai. The vector Gaussian broadcast channel with imperfect channel state information at the transmitter (CSIT) is considered where the transmitter only knows the channel mean and variance. Our focus is on the implementation and performance analysis of CMHP under the imperfect CSIT model using practical codes. Turbo codes described in IEEE 802.20 draft specification and quadrature amplitude modulation are used to implement CMHP. In order to find the optimal power allocation and beamforming vectors which maximize the sum rate with practical codes, we introduce the SINR penalty factor. The SNRs that achieve various target spectral efficiency are presented and analyzed.