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2

Inverting a channel can only be done when the channel is a minimum phase system (trailing echos only). A minimum phase system is characterized as having all zeros in the left half plane (for the s plane, or equivalently in a sampled system and the z plane all zeros inside the unit circle). Inverting such a channel results in poles where every zero exists, ...

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You've got a system of equations with 2 unknowns ($A$ and the phase offsets). You hence need two equations. That means two samples.

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Addition and subtraction in 2's complement or unsigned is the same. The only difference is for overflows. Assuming 16-bit arithmetic, overflows occur in unsigned addition when you go over 0xFFFF (65535). For example, if you add 1 to 0xFFFF you will wrap around to 0. In 2's complement, the overflow will technically occur when you go over 0x7FFF (32767). If ...

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