매트랩 질문 좀 드릴게요;;;

[매트랩(125.130)]

function [x_bpsk bpsk] = Mod_bpsk(bits)

global freq;
global t;

bpsk = [];
carrier = sin(freq * t);

for n = 1 : length(bits)
    if bits(n) == 0
        as = -1;
    else
        as = 1;
    end
    bpsk = [bpsk as*carrier];
    x_bpsk = 0 : 0.01 : (length(bpsk) / 100) - 0.01;
end

함수 하나를 이렇게 짰고

close all
clear all
clc

global freq;
global t;
global bits;

% Input Data
bit_len = input('How many bits do you want to generate? : ');
sim_loop = input('How many times to simulate? : ');
freq = input('What is frequency of carrier sinal? : ');
SNR_start = input('What is SNR of start point in this system? : ');
SNR_end = input('What is SNR of end point in this system? : ');

% Parameter
t = 0 : 2*pi/99 : 2*pi;
BER_avg = [];
SNR = SNR_start : 1 : SNR_end;

for ii = 1 : length(SNR)
    for sim = 1 : sim_loop
        % Generate Random bit
        bits = randi([0 1], 1, bit_len);

        % BPSK modulation
        [x_bpsk bpsk] = Mod_bpsk(bits);

        % Add AWGN
        [AWGN_sig] = AWGN(bpsk,SNR(ii),bits);

        % BPSK modulation
        [dbpsk] = dMod_bpsk(AWGN_sig,bits);

        % Calculate BER performance
        BER(sim) = sum(bits ~= dbpsk) / bit_len;
    end
    BER_avg = [BER_avg mean(BER)];
end

메인함수부분에서 이렇게 호출했는데  [x_bpsk bpsk] = Mod_bpsk(bits); 여기서 자꾸

Too many input arguments.라는 에러가 뜨네요

당췌 뭐가 문젠지 모르겠어요;; 도와주세요