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We present an implementation of the coherent dedispersion algorithm capableof dedispersing high-time-resolution radio observations to many differentdispersion measures (DMs). This approach allows the removal of the dispersiveeffects of the interstellar medium and enables searches for pulsed emissionfrom pulsars and other millisecond-duration transients at low observingfrequencies and/or high DMs where time broadening of the signal due todispersive smearing would otherwise severely reduce the sensitivity. Theimplementation, called 'cdmt', for Coherent Dispersion Measure Trials, exploitsthe parallel processing capability of general-purpose graphics processing unitsto accelerate the computations. We describe the coherent dedispersion algorithmand detail how cdmt implements the algorithm to efficiently compute manycoherent DM trials. We present the concept of a semi-coherent dedispersionsearch, where coherently dedispersed trials at coarsely separated DMs aresubsequently incoherently dedispersed at finer steps in DM. The software isused in an ongoing LOFAR pilot survey to test the feasibility of performingsemi-coherent dedispersion searches for millisecond pulsars at 135MHz. Thispilot survey has led to the discovery of a radio millisecond pulsar -- thefirst at these low frequencies. This is the first time that such a broad andcomprehensive search in DM-space has been done using coherent dedispersion, andwe argue that future low-frequency pulsar searches using this approach are bothscientifically compelling and feasible. Finally, we compare the performance ofcdmt with other available alternatives.

Enabling pulsar and fast transient searches using coherent dedispersion