Method and device for synchronization and channel estimation in a radio receiver

A method in a radio receiver of generating synchronization and channel estimation information for a received signal, said method comprising the steps of:

• generating a spatially and temporally stacked signal model by stacking successive samples of temporally adjacent received signal vectors and corresponding training vectors;
• generating an initial estimate of a whitening filter based on the spatially and temporally stacked signal model;
• generating a whitened signal and training sequence based on the initial estimate of the whitening filter;
• finding a synchronization position based on the whitened signal and whitened training sequence;
• and
• computing a channel estimate based on the whitened signal and whitened training sequence.

A method in a radio receiver of generating synchronization and channel estimation information for a received signal, said method comprising the steps of:

• generating a spatially and temporally stacked signal model by stacking successive samples of temporally adjacent received signal vectors and corresponding training vectors;
• generating an initial channel estimate based on the spatially and temporally stacked signal model;
• finding a synchronization position for the received signal based on the initial channel estimate:
• computing a whitening filter based on the initial channel estimate and the synchronization position;
• generating a whitened signal and training sequence based on the computed whitening filter;
• and
• computing an improved channel estimate based on the whitened signal and training sequence.

A method in a radio receiver of generating synchronization and channel estimation information for a received signal, said method comprising the steps of:

• generating a spatially and temporally stacked signal model by stacking successive samples of temporally adjacent received signal vectors and corresponding training vectors;
• generating initial estimates of a whitening filter and a synchronization position based on the spatially and temporally stacked signal model;
• generating a whitened signal and training sequence based on the initial whitening filter;
• computing a channel estimate based on the whitened signal and training sequence;
• determining whether a stopping criterion has been met;
• utilizing the latest estimate of the whitening filter, the latest estimate of the synchronization position, and the latest channel estimate to process the received signal if the stopping criterion has been met;
• and
• re-calculating an improved synchronization position, an improved whitening filter, and an improved channel estimate if the stopping criterion has not been met.

A method in a radio receiver of generating synchronization and channel estimation information based on three parameters, said parameters consisting of a synchronization position, at least one whitening filter parameter, and a channel estimate, said method comprising the steps of:

• generating a spatially and temporally stacked signal model by stacking successive samples of temporally adjacent received signal vectors and corresponding training vectors;
• generating initial estimates of a first one or two of the three parameters based on the spatially and temporally stacked signal model;
• computing the remainder of the three parameters based on the initial estimates of the first one or two parameters;
• determining whether the initial channel estimate is known to be accurate;
• and
• if the initial channel estimate is not known to be accurate, recomputing the three parameters based on the previously computed parameters.

A device in a radio receiver for generating synchronization and channel estimation information based on three parameters, said parameters consisting of a synchronization position, at least one whitening filter parameter, and a channel estimate, said device comprising:

• means for generating a spatially and temporally stacked signal model by stacking successive samples of temporally adjacent received signal vectors and corresponding training vectors;
• means for generating initial estimates of a first one or two of the three parameters based on the spatially and temporally stacked signal model;
• means for computing the remainder of the three parameters based on the initial estimates of the first one or two parameters;
• means for determining whether the initial channel estimate is known to be accurate:
• and
• means responsive to a determination that the initial channel estimate is not known to be accurate, for recomputing the three parameters based on the previously computed parameters.