System object: comm.SphereDecoder
Decode received symbols using sphere decoding algorithm
Y = step(H, RXSYMBOLS, CHAN)
Y = step(H, RXSYMBOLS, CHAN) decodes the
received symbols, RXSYMBOLS, using the sphere decoding algorithm.
The algorithm can be employed to decode Ns channel realizations in
one call, where in each channel realization, Nr symbols are received.
The inputs are:
RXSYMBOLS: a [Ns Nr] complex double matrix
containing the received symbols.
CHAN: a [Ns Nt Nr] or [1 Nt Nr] complex double
matrix representing the fading channel coefficients of the flat-fading
MIMO channel. For the [Ns Nt Nr] case, the object applies each channel
matrix to each Nr symbol set. For the block fading case, i.e., when
the size of
CHAN is [1 Nt Nr], the same channel
is applied to all of the received symbols.
Y, which depends on the setting
is a double matrix containing the Log-Likelihood Ratios (LLRs) of
the decoded bits or the bits themselves. For both cases, the size
of the output is [Ns*bitsPerSymbol Nt], where
the number of bits per transmitted symbol, as determined by the
The object performs an initialization the first time the