128qam调制解调的代码
时间: 2023-05-13 18:04:04 浏览: 253
128QAM调制解调是一种数字调制方式,可以实现高速数据传输。以下是一份可能的代码实现:
调制:
```python
import numpy as np
def modulate_128qam(data_bits):
# 将比特流按照4比特为一组进行分组
data_groups = np.reshape(data_bits, (-1, 4))
# 对每组比特进行映射,得到复数
qam_symbols = []
for group in data_groups:
idx = group.dot(2 ** np.arange(4)[::-1])
i_qam = ((idx >> 4) * 2 - 7) + 1j * ((idx & 0xf) * 2 - 7)
qam_symbols.append(i_qam)
# 进行128QAM调制
return np.sqrt(21/128) * np.array(qam_symbols)
```
解调:
```python
def demodulate_128qam(qam_symbols):
# 将复数映射到16进制编号
idx = np.round((qam_symbols.real + 7) * 4) * 16 + np.round((qam_symbols.imag + 7) * 4)
idx = np.clip(idx.astype(int), 0, 127)
# 将编号转换为比特流
data_bits = np.zeros(len(qam_symbols) * 4, dtype=int)
for i in range(len(idx)):
data_bits[i*4:(i+1)*4] = np.binary_repr(idx[i], width=4)
return data_bits
```
其中,要输入的`data_bits`是比特流,输出的`qam_symbols`是复数序列,在传输时需要将其映射到模拟载波信号中。解调时,需要将接收到的模拟载波信号进行数字化并解调,得到原始比特流。
阅读全文