27 lines
856 B
Python
27 lines
856 B
Python
import numpy as np
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# TODO: Unify the interface regarding [0, 1]^n and [-1, 1]^n
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# TODO: Should the encoder be responsible for mapping the message from [0, 1]^n to [-1, 1]^n?
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# (ie. should the encoder perform modulation?)
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class Encoder:
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"""Class implementing an encoder for block codes.
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"""
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def __init__(self, G: np.array):
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"""Construct a new Encoder object.
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:param G: Generator matrix
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"""
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self._G = G
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def encode(self, d: np.array) -> np.array:
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"""Map a given dataword onto the corresponding codeword.
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The returned codeword is mapped from [0, 1]^n onto [-1, 1]^n.
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:param d: Dataword (element of [0, 1]^n)
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:return: Codeword (already element of [-1, 1]^n)
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"""
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# TODO: (0 -> 1), (1 -> -1); Not (0 -> -1), (-1 -> 1)
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return np.dot(d, self._G) * 2 - 1
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