Here’s a quick approximation, using CommunicationsSequences.jl to generate the spreading sequence.

using CommunicationsSequences
# 7-bit spreading sequence
l = LFSR(lfsrtaps[3], mapping = (1, -1))
seq = first(l, 7)
# 10 data bits to be transmitted
tx_data = rand((0,1),10)
# generate DSSS sequence
dsss = Int[]
for i in 1:10
if tx_data[i] == 1
append!(dsss, seq)
else
append!(dsss, -seq)
end
end
# recover bits from DSSS sequence
rx = reshape(dsss, 7, 10) # one bit per column
rx_data = Int[]
for i in 1:10
if sum(rx[:,i] .* seq) > 0
append!(rx_data, 1)
else
append!(rx_data, 0)
end
end
# verify
tx_data .== rx_data

You also mentioned generating an analog sampled spread spectrum signal. How to do this depends on the details: are you using pulse shaping? Adding noise? Matched filtering?