A 3.66Gb/s 275mW TB-LDPC-CC decoder chip for MIMO broadcasting communications

In this work, a decoder chip for time-invariant tail-biting LDPC convolutional code (TB-LDPC-CC) is proposed. By modifying the layered decoding scheduling, the proposed decoding algorithm can achieve twice faster decoding convergence than the conventional flooding scheduling. Furthermore, 30.77% storage requirement is also reduced due to adaptive channel value addressing employed in memory-based decoder design. The multiple frame sizes handling ability can lower the power and adapt to multiple applications. By integrating these techniques, a TB-LDPC-CC decoder chip supporting three frame sizes is implemented in UMC 90nm CMOS technology. The decoder containing 4 processors occupies 2.18mm2 area and provides maximum throughput 3.66Gb/s under 0.8V supply and 305MHz with a 18.8pJ/bit/proc energy efficiency.