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Performance improvements (#30)
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* Performance optimization

* Memory reduction

* Improve tests

* Version up
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@dominformant
dominformant authored Sep 10, 2021
1 parent 73a7f9b commit f8e18d2
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Showing 4 changed files with 63 additions and 44 deletions.
2 changes: 1 addition & 1 deletion Project.toml
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
name = "Tracking"
uuid = "10b2438b-ffd4-5096-aa58-44041d5c8f3b"
authors = ["Soeren Zorn <soeren.zorn@nav.rwth-aachen.de>"]
version = "0.14.7"
version = "0.14.8"

[deps]
DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
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2 changes: 1 addition & 1 deletion src/code_replica.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ function gen_code_replica!(
start_code_phase::AbstractFloat,
start_sample::Integer,
num_samples::Integer,
correlator_sample_shifts::SVector,
correlator_sample_shifts::AbstractVector,
prn::Integer
)
most_early_sample_shift = correlator_sample_shifts[end]
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30 changes: 17 additions & 13 deletions src/correlator.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -261,13 +261,12 @@ function correlate(
start_sample,
num_samples
) where {T <: AbstractCorrelator}
accumulators = zero_accumulators(get_accumulators(correlator), downconverted_signal)
a_re = zero_accumulators(get_accumulators(correlator), downconverted_signal)
a_im = zero_accumulators(get_accumulators(correlator), downconverted_signal)
d_re = downconverted_signal.re
d_im = downconverted_signal.im
a_re = real.(accumulators)
a_im = imag.(accumulators)
@avx for i = start_sample:num_samples + start_sample - 1
for j = 1:length(accumulators)
for j = 1:length(a_re)
sample_shift = correlator_sample_shifts[j] - correlator_sample_shifts[1]
a_re[j] += d_re[i] * code[i + sample_shift]
a_im[j] += d_im[i] * code[i + sample_shift]
Expand All @@ -278,10 +277,10 @@ function correlate(
end

function zero_accumulators(accumulators::SVector, signal)
zeros(MVector{length(accumulators), eltype(signal)})
zeros(MVector{length(accumulators), real(eltype(signal))})
end
function zero_accumulators(accumulators::Vector, signal)
zeros(eltype(signal), length(accumulators))
zeros(real(eltype(signal)), length(accumulators))
end

"""
Expand All @@ -297,21 +296,26 @@ function correlate(
start_sample,
num_samples,
) where {N}
accumulators = zero(MMatrix{N, length(correlator_sample_shifts), eltype(downconverted_signal)})
a_re = real.(accumulators)
a_im = imag.(accumulators)
a_re = zero_accumulators(get_accumulators(correlator), downconverted_signal)
a_im = zero_accumulators(get_accumulators(correlator), downconverted_signal)
d_re = downconverted_signal.re
d_im = downconverted_signal.im
@avx for i = start_sample:num_samples + start_sample - 1
for k = 1:size(accumulators, 2)
for j = 1:size(accumulators, 1)
for k = 1:size(a_re, 2)
for j = 1:size(a_re, 1)
shift = correlator_sample_shifts[k] - correlator_sample_shifts[1]
a_re[j,k] += d_re[i,j] * code[shift + i]
a_im[j,k] += d_im[i,j] * code[shift + i]
end
end
end

accumulators_new = SVector(eachcol(complex.(SMatrix(a_re), SMatrix(a_im)))...)
typeof(correlator)(map(+, get_accumulators(correlator), accumulators_new))
typeof(correlator)(map(+, get_accumulators(correlator), eachcol(complex.(a_re, a_im))))
end

function zero_accumulators(accumulators::SVector{NC, <:SVector{NA}}, signal) where {NC, NA}
zeros(MMatrix{NA, NC, real(eltype(signal))})
end
function zero_accumulators(accumulators::Vector{<:SVector{NA}}, signal) where NA
zeros(real(eltype(signal)), NA, length(accumulators))
end
73 changes: 44 additions & 29 deletions test/correlator.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -9,17 +9,33 @@
@test @inferred(get_prompt(correlator, correlator_sample_shifts)) == 0.0
@test @inferred(get_late(correlator, correlator_sample_shifts, early_late_index_shift)) == 0.0

correlator = @inferred EarlyPromptLateCorrelator(NumAnts(1), 3)
@test isa(get_accumulators(correlator), Vector)

correlator = @inferred EarlyPromptLateCorrelator(NumAnts(1))

@test @inferred(get_early(correlator, correlator_sample_shifts, early_late_index_shift)) == 0.0
@test @inferred(get_prompt(correlator, correlator_sample_shifts)) == 0.0
@test @inferred(get_late(correlator, correlator_sample_shifts, early_late_index_shift)) == 0.0

correlator = @inferred EarlyPromptLateCorrelator(NumAnts(1), 3)

@test @inferred(get_early(correlator, correlator_sample_shifts, early_late_index_shift)) == 0.0
@test @inferred(get_prompt(correlator, correlator_sample_shifts)) == 0.0
@test @inferred(get_late(correlator, correlator_sample_shifts, early_late_index_shift)) == 0.0

correlator = @inferred EarlyPromptLateCorrelator(NumAnts(2))

@test @inferred(get_early(correlator, correlator_sample_shifts, early_late_index_shift)) == SVector(0.0 + 0.0im, 0.0 + 0.0im)
@test @inferred(get_prompt(correlator, correlator_sample_shifts)) == SVector(0.0 + 0.0im, 0.0 + 0.0im)
@test @inferred(get_late(correlator, correlator_sample_shifts, early_late_index_shift)) == SVector(0.0 + 0.0im, 0.0 + 0.0im)

correlator = @inferred EarlyPromptLateCorrelator(NumAnts(2), 3)

@test @inferred(get_early(correlator, correlator_sample_shifts, early_late_index_shift)) == SVector(0.0 + 0.0im, 0.0 + 0.0im)
@test @inferred(get_prompt(correlator, correlator_sample_shifts)) == SVector(0.0 + 0.0im, 0.0 + 0.0im)
@test @inferred(get_late(correlator, correlator_sample_shifts, early_late_index_shift)) == SVector(0.0 + 0.0im, 0.0 + 0.0im)

end
@testset "Zeroing correlator" begin
correlator = @inferred EarlyPromptLateCorrelator(
Expand Down Expand Up @@ -154,6 +170,8 @@
)
)
end


@testset "Correlate" begin
gpsl1 = GPSL1()
signal = StructArray{Complex{Float32}}(
Expand All @@ -166,36 +184,33 @@
(1 + correlator_sample_shifts[1]:2500 + correlator_sample_shifts[end]) * 1023e3 / 2.5e6,
1
)
correlator = EarlyPromptLateCorrelator(SVector(0.0 + 0.0im, 0.0 + 0.0im, 0.0 + 0.0im))

correlator_result = Tracking.correlate(
correlator,
signal,
code,
correlator_sample_shifts,
1,
2500
)
@test get_early(correlator_result, correlator_sample_shifts, 1) ==
get_late(correlator_result, correlator_sample_shifts, 1)
@test get_prompt(correlator_result, correlator_sample_shifts) == 2500


signal_mat = repeat(signal, outer = (1,3))
correlator_sample_shifts = SVector(-1,0,1)
correlator = EarlyPromptLateCorrelator(NumAnts(3))

correlator_result = Tracking.correlate(
correlator,
signal_mat,
code,
correlator_sample_shifts,
1,
2500,
)
@test get_early(correlator_result, correlator_sample_shifts, 1) == get_late(correlator_result, correlator_sample_shifts, 1)
@test all(get_early(correlator_result, correlator_sample_shifts, 1) .== 1476)
@test all(get_prompt(correlator_result, correlator_sample_shifts) .== 2500)
@testset "↳ $na antennas" for na ∈ [1, 4, 15]
signal_mat = na == 1 ? signal : repeat(signal, outer=(1,na))

@testset "↳ $(string(type)) accumulator" for type ∈ [:SVector, :Vector]
if type == :SVector
correlator = EarlyPromptLateCorrelator(NumAnts(na))
else
correlator = EarlyPromptLateCorrelator(NumAnts(na), 3)
end

correlator_result = Tracking.correlate(
correlator,
signal_mat,
code,
correlator_sample_shifts,
1,
2500,
)
early = get_early(correlator_result, correlator_sample_shifts, 1)
prompt = get_prompt(correlator_result, correlator_sample_shifts)
late = get_late(correlator_result, correlator_sample_shifts, 1)
@test early == late
@test all(early .== 1476)
@test all(prompt .== 2500)
end
end
end

end

2 comments on commit f8e18d2

@dominformant
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Registration pull request created: JuliaRegistries/General/44645

After the above pull request is merged, it is recommended that a tag is created on this repository for the registered package version.

This will be done automatically if the Julia TagBot GitHub Action is installed, or can be done manually through the github interface, or via:

git tag -a v0.14.8 -m "<description of version>" f8e18d25de564fdd17178fefdcddca516a8923fe
git push origin v0.14.8

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