Hardware implementation of a modified SSD LDPC decoder
Aghila Rajagopal, K. S. Vasundara Patel, K. Karibasappa · International Journal of Computer Aided Engineering and Technology · 2021
In this work, a modification approach to the simplified soft distance (SSD) algorithm is discussed by considering soft Euclidean squared distance as a performance metric. The SSD algorithm is theoretically independent of the signal to noise ratio of the received signal. Multiplication and addition terms are the only constituents of this algorithm which reduces the complexity. In this paper, an attempt has been made to compare and analyse the performance of modified SSD with other popular algorithms such as SPA, SSPA, and LogSPA. The algorithm is implemented on Virtex-5 xc5vlx110t FPGA kit to observe the real time implications and draw apt conclusions. From the FPGA results, this paper aims to conclude the performance of modified SSD is similar to that of LogSPA with changes observed as improved throughput speed and improved bit error rate (BER).