diff --git a/src/tracking_loop.jl b/src/tracking_loop.jl
index 585a6b5..ec28158 100644
--- a/src/tracking_loop.jl
+++ b/src/tracking_loop.jl
@@ -358,9 +358,6 @@ end
 function choose(replica::CarrierReplicaCPU, signal::AbstractArray{Complex{T}}) where T <: Number
     replica.carrier_f32
 end
-function choose(replica::Nothing, signal::AbstractArray)
-    nothing
-end
 function choose(replica::DownconvertedSignalCPU, signal::AbstractArray{Complex{Float64}})
     replica.downconverted_signal_f64
 end
diff --git a/src/tracking_state.jl b/src/tracking_state.jl
index f4d82ea..9f9cc9c 100644
--- a/src/tracking_state.jl
+++ b/src/tracking_state.jl
@@ -50,8 +50,6 @@ function DownconvertedSignalCPU(num_ants::NumAnts{N}) where N
     )
 end
 
-@inline gen_blank_carrier_gpu(system::S, num_samples) where {CO <: CuMatrix,S <: AbstractGNSS{CO}} = StructArray{ComplexF32}((CuArray{Float32}(undef, num_samples), CuArray{Float32}(undef, num_samples)))
-
 """
 $(SIGNATURES)