diff --git a/matlab/updated_scripts/calculate_channel.m b/matlab/updated_scripts/calculate_channel.m
index 8665d91..e39fc37 100644
--- a/matlab/updated_scripts/calculate_channel.m
+++ b/matlab/updated_scripts/calculate_channel.m
@@ -1,15 +1,17 @@
-% Calculate channel taps based on the 4th OFDM symbol (first ZC sequence)
+% Calculate channel taps based on the 4th or 6th OFDM symbol (both are ZC sequences)
 %
 % There is almost certainly a better way to do this, but this gets the job done
 %
-% @param zc_seq Frequency domain ZC sequence from OFDM symbol number 4 (all FFT bins, no cyclic prefix)
+% @param zc_seq Frequency domain ZC sequence from OFDM symbol number 4 or 6 (all FFT bins, no cyclic prefix)
 % @param sample_rate Sample rate (in Hz) of `zc_seq`
-% @return taps Result of dividing `zc_seq` into a golden reference copy of the first ZC sequence
-function [taps] = calculate_channel(zc_seq, sample_rate)
+% @param symbol_idx Which symbol (must be 4 or 6) is in the `zc_seq` vector
+% @return taps Result of dividing `zc_seq` into a golden reference copy of the selected ZC sequence
+function [taps] = calculate_channel(zc_seq, sample_rate, symbol_idx)
+    assert(symbol_idx == 4 || symbol_idx == 6, "Symbol index must be 4 or 6");
     fft_size = get_fft_size(sample_rate);
     
     % The golden reference needs to be in the frequency domain
-    gold_seq = fftshift(fft(reshape(create_zc(fft_size, 4), size(zc_seq))));
+    gold_seq = fftshift(fft(reshape(create_zc(fft_size, symbol_idx), size(zc_seq))));
     
 %     figure(400);
 %     subplot(1, 2, 1);
diff --git a/matlab/updated_scripts/process_file.m b/matlab/updated_scripts/process_file.m
index aae64d2..b2a51a8 100644
--- a/matlab/updated_scripts/process_file.m
+++ b/matlab/updated_scripts/process_file.m
@@ -101,7 +101,7 @@ for burst_idx=1:size(bursts, 1)
     [time_domain_symbols, freq_domain_symbols] = extract_ofdm_symbol_samples(burst, file_sample_rate);
     
     % Calculate the channel based on the first ZC sequence which is in OFDM symbol #4
-    channel = calculate_channel(freq_domain_symbols(4,:), file_sample_rate);
+    channel = calculate_channel(freq_domain_symbols(4,:), file_sample_rate, 4);
 
     % Place to store the demodulated bits
     bits = zeros(9, 1200);