ISI mitigation using bit-edge equalization in high-speed backplane data transmission

Using bit-edge equalization in highspeed backplane data transmission

“…The bit-edge equalization (BEE) method proposed in [12] is based on equalizing only the edges of data bits by adjusting the least-mean-square (LMS) error derivation points. In [12], the basic equalization concept of the proposed BEE was presented, and the link performance by using the proposed BEE was demonstrated.…”

“…In [12], the basic equalization concept of the proposed BEE was presented, and the link performance by using the proposed BEE was demonstrated. This paper expands upon the previous work in [12] by providing a detailed analytical comparisons of the proposed BEE transceiver architecture with the conventional bit-center equalization (BCE) and duobinary transceiver architectures.…”

Comparison of amplitude-optimised bit-edge equalisation with pulse-width modulation in high-speed wireline application

“…However, such a sampling approach is not suitable at high data rates. Previous work [4] demonstrates that, at a high data rate, the severe channel phase delay distortion results in a shift in the optimal bit-centre and bit-edge sampling points. Reference [4] proposed a unique amplitude-optimised bit-edge equalisation (BEE) method that was based on equalising only the edges of data bits by adjusting the least-mean-square (LMS) error derivation points.…”

10+Gbps serial data transmission over a Tyco 34" FR4 backplane channel using amplitude-optimized bit-edge equalization with an adjustment of LMS error derivation points

“…As illustrated in Figure 4.3, since the channel's pulse response without TX pre-emphasis peaks at the middle of the two bit-center sampling instances (unit intervals 14 and 15), instead of using BCE to push the peak of the pulse to the bit center, an alternative way is to make use of the channel's pulse response characteristics by using BEE. Previous works [7], [8] have demonstrated that by using the proposed BEE, the channel's near-end data spectrum has more DC and low frequency content compared to that using the BCE and duobinary schemes. Therefore, at the channel's far-end, the pulse that represents a bit is least attenuated by the chan-…”

“…This nonlinear phase dispersion causes sever post-cursor signal distortion. The received data eyes are no longer peaked at bit centers, and the eye diagrams are no longer symmetric [7], [8]. On the other hand, an FIR filter based on amplitude modulation not only changes pulse amplitudes, but also changes the slopes of the pulse rising and falling edges.…”