feat: GPU-accelerated downconvert and correlate via KernelAbstractions.jl#99

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ss/ka-downconvert-and-correlate

Commits on Mar 5, 2026

feat: GPU-accelerated downconvert and correlate via KernelAbstractions.jl

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bench: add CUDA vs KernelAbstractions vs CPU benchmark to Buildkite CI

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bench: add multi-backend GPU vs CPU benchmark

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bench: refactor benchmarks into modular suite files

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fix: correct BenchmarkTools UUID and fix BenchmarkGroup composition

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refactor: remove Int32 fixed-point code path, use Int64 only

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refactor: unify single and multi-antenna kernels into one

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test: add KA tracking integration tests for GPSL1 and GPSL1+GalileoE1B

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fix: skip old CUDA extension in multi-system benchmark

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refactor: remove old CUDA extension, add KA GPU tests and Buildkite benchmarks

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