改善这段话更流畅：In summary both of these codes are convolutional codes but the convolutional methods are different the staircase codes are backward convolutional while the BMST codes are forward convolutiona

To summarize, while both of these codes are convolutional codes, their convolutional methods differ. Staircase codes use backward convolutional methods, while BMST codes use forward convolutional methods. In staircase codes, each coded block is protected by two independent codewords to safeguard its bits. On the other hand, in BMST codes, the bits in each coded block can be considered as being transmitted twice through superposition.