Optimization of Finite-Length Protograph-Based SC-LDPC Anytime Codes

In this letter, we present an optimization method for designing Protograph-based spatially coupled low-density parity-check anytime (P-anytime) codes with outstanding finite-length performance. We first introduce two performance metrics, namely the delay-exponent and anytime mean parameters, to effectively capture the finite-length behavior of P-anytime codes. We then propose a multi-objective optimization algorithm to optimize these performance metrics and design novel P-anytime codes. Simulation results demonstrate that our proposed P-anytime codes achieve one to two orders of magnitude improvement in both bit erasure rate and bit error rate compared with prior-art anytime codes.