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block_4by4_complex
------------------

This block is used for simulations of the channel. It implements
a NxM MIMO-system, where N and M are <= 4.
 One can give the size of the block in samples as well as the
precision of the A/D converter.
 The channel-matrix h[n][m] represents the channel between the
tx-antenna (input) 'm' and the rx-antenna (output) 'n'.
 For the receiving-antenna you can give the sigma of the white noise.
Please be aware that the sigma is between -32767 and 32767, and compares
to a signal-amplitude set by the modules (usually around 10000), whereas
the more conventional sigma compares to a signal-amplitude of 1.

Inputs:
	SYMBOL_COMPLEX[4]

outputs:
	SYMBOL_COMPLEX[4]

Config:
	double h[MAX_NO_RX][MAX_NO_TX]<complex>: 0.5 + 0.5j
		channel entries over rows  

	double sigma[MAX_NO_RX]<complex>: 100 + 100j
		The sigma of the gaussian-noise at the receiver

	precision<int>: 12
		The precision of the A/D converter

	size<int>: 2560
		The number of symbols of the block


Stats:
	max_no_rx<int>:
		The maximum number of reception antennas

	max_no_tx<int>:
		The maximum number of transmission antennas