We consider Waveform Relaxation (WR) methods for parallel and partitioned time-integration of surface-coupled multiphysics problems. WR allows independent time-discretizations on adaptive time-grids, while maintaining high orders. Classical such as Jacobi or Gauss-Seidel are typically either converge quickly. present a novel method utilizing asynchronous communication techniques to get both pro...

Waveform relaxation algorithms for partial diierential equations (PDEs) are traditionally obtained by discretizing the PDE in space and then splitting the discrete operator using matrix splittings. For the semidiscrete heat equation one can show linear convergence on unbounded time intervals and superlinear convergence on bounded time intervals by this approach. However the bounds depend in gen...

The optimum receiver to detect the bits of multiple CDMA users has exponential complexity in the number of active users in the system. Consequently, many suboptimum receivers have been developed to achieve good performance with less complexity. In this paper, we take the approach of approximating the solution of the optimum multiuser detection problem (OMUD) using nonlinear programming relaxati...