编程实现 输入:长度为4的任意二进制序列。 输出:输入数据经Hamming(7,4)编码器编码之后,通过二元对称信道模拟器(错误概率为0.1)传输后,再经过Hamming(7,4)译码器译码输出得到信宿端的长度为4的二进制序列。
时间: 2024-01-21 14:18:18 浏览: 103
以下是Python实现代码:
```python
import random
# 构造Hamming(7, 4)编码器和译码器对应的矩阵
G = [[1, 0, 0, 0, 1, 1, 0],
[0, 1, 0, 0, 1, 0, 1],
[0, 0, 1, 0, 0, 1, 1],
[0, 0, 0, 1, 1, 1, 1]]
H = [[1, 0, 1, 0, 1, 0, 1],
[0, 1, 1, 0, 0, 1, 1],
[0, 0, 0, 1, 1, 1, 1]]
# Hamming(7, 4)编码函数
def hamming_encode(bits):
code = [0] * 7
for i in range(4):
for j in range(7):
code[j] ^= bits[i] * G[i][j]
return code
# 二元对称信道模拟器函数
def channel_transmit(bits, error_prob):
transmitted_bits = []
for bit in bits:
if random.random() < error_prob:
transmitted_bits.append(1 - bit)
else:
transmitted_bits.append(bit)
return transmitted_bits
# Hamming(7, 4)译码函数
def hamming_decode(bits):
syndrome = []
for i in range(3):
s = 0
for j in range(7):
s += bits[j] * H[i][j]
syndrome.append(s % 2)
error_index = sum([2**i * syndrome[i] for i in range(3)])
if error_index == 0:
return bits[:4]
else:
corrected_bits = bits[:]
corrected_bits[error_index-1] = 1 - corrected_bits[error_index-1]
return corrected_bits[:4]
# 测试
bits = [random.randint(0, 1) for i in range(4)]
print("原始数据:", bits)
encoded_bits = hamming_encode(bits)
print("编码后数据:", encoded_bits)
transmitted_bits = channel_transmit(encoded_bits, 0.1)
print("传输后数据:", transmitted_bits)
decoded_bits = hamming_decode(transmitted_bits)
print("译码后数据:", decoded_bits)
```
这个程序会先随机生成一个长度为4的二进制序列,然后通过Hamming(7, 4)编码器编码,再通过二元对称信道模拟器进行传输,最后通过Hamming(7, 4)译码器译码输出得到信宿端的长度为4的二进制序列。你可以自己修改代码中的参数进行测试。
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