A Low-Complexity Decision Feedforward Equalizer Architecture for High-Speed Receivers on Highly Dispersive Channels

Abstract

This paper presents an improved decision feedforward equalizer (DFFE) for high speed receivers in the presence of highly dispersive channels. This decision-aided equalizer technique has been recently proposed for multigigabit communication receivers, where the use of parallel processing is mandatory. Well-known parallel architectures for the typical decision feedback equalizer (DFE) have a complexity that grows exponentially with the channel memory. Instead, the new DFFE avoids that exponential increase in complexity by using tentative decisions to cancel iteratively the intersymbol interference (ISI). Here, we demostrate that the DFFE not only allows to obtain a similar performance to the typical DFE but it also reduces the compelxity in channels with large memory. Additionally, we propose a theoretical approximation for the error probability in each iteration. In fact, when the number of iteration increases, the error probability in the DFFE tends to approach the DFE. These benefits make the DFFE an excellent choice for the next generation of high-speed receivers.

Enhancing Techniques for Adaptable Decision Feedback Balancer for 5G Communication

“…The suggested architectures are applied to ten Gbase-LX4 optical communication systems in order to illustrate their effectiveness [22]. This paper [23] suggests estimating the error probability in every iteration theoretically. The chance of error in the DFFE(Decision Feed Forward Equalizer) is prone to approaching the DFE as the number of iterations grows.…”

Adopting a low hardware redesigned architectural design for educational environment by using DFE-based 5G communication

“…The operation of DFE can be explained with the following sets of equation where n is the current time instance, x n is the vector of received samples, d n is the vector of detected samples f n if FFF coefficient vector, b n is the FBF coefficient vector. 7,8 The architectural diagram of relaxed look ahead DFE is shown in Figure 3.…”