Skip to content

Channel

Bases: object

Class that is representation of the channel.

Attributes:

Name Type Description
noise_type str

Type of noise in channel.
_noise_method Callable[[float, int, int], NDArray[float64]]

Method responible for generating noise.

Methods:

Name Description
gwn

Function returns samples of gaussian white noise.
send_through

Function retunrs samples of signal after channel noise.
Source code in src\transmission_simulation.py 
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
class Channel(object):
    """
    Class that is representation of the channel.

    Attributes
    ----------
    noise_type : str
        Type of noise in channel.
    _noise_method: Callable[[float, int, int], NDArray[np.float64]]
        Method responible for generating noise.
    Methods
    -------
    gwn()
        Function returns samples of gaussian white noise.
    send_through()
        Function retunrs samples of signal after channel noise.
    """

    def __init__(self, noise_type: str):
        """"""
        self.noise_type = noise_type
        noise_method = getattr(self, noise_type)
        if not isinstance(noise_method, (FunctionType, MethodType)):
            raise ValueError(f"There is no such method '{noise_type}' in Channel class.")
        self._noise_method = noise_method


    def gwn(self, EbN0dB: float, K: int, N: int) -> NDArray[np.float64]:
        """"""
        N0Eb = 10 ** (-EbN0dB/10)
        std_dev = sqrt(0.5 * N/K * N0Eb)

        return np.random.randn(N) * std_dev


    def send_through(self, mod_seq: NDArray[np.int8], EbN0dB: float, K: int) -> NDArray[np.float64]:
        """"""
        N = mod_seq.size
        return mod_seq + self._noise_method(EbN0dB, K, N)

__init__(noise_type)

Source code in src\transmission_simulation.py 
34
35
36
37
38
39
40
def __init__(self, noise_type: str):
    """"""
    self.noise_type = noise_type
    noise_method = getattr(self, noise_type)
    if not isinstance(noise_method, (FunctionType, MethodType)):
        raise ValueError(f"There is no such method '{noise_type}' in Channel class.")
    self._noise_method = noise_method

gwn(EbN0dB, K, N)

Source code in src\transmission_simulation.py 
43
44
45
46
47
48
def gwn(self, EbN0dB: float, K: int, N: int) -> NDArray[np.float64]:
    """"""
    N0Eb = 10 ** (-EbN0dB/10)
    std_dev = sqrt(0.5 * N/K * N0Eb)

    return np.random.randn(N) * std_dev

send_through(mod_seq, EbN0dB, K)

Source code in src\transmission_simulation.py 
51
52
53
54
def send_through(self, mod_seq: NDArray[np.int8], EbN0dB: float, K: int) -> NDArray[np.float64]:
    """"""
    N = mod_seq.size
    return mod_seq + self._noise_method(EbN0dB, K, N)