CPC H04L 25/0216 (2013.01) [H04L 25/0228 (2013.01); H04L 27/261 (2013.01)] | 18 Claims |
1. A method performed by a receiving node for determining a channel window length (l ) for a transformed domain channel estimator, the channel window length (l ) to be applied for a particular reference signal, RS, carrying symbol, the method comprising:
obtaining at least two subsets (A1, A2, . . . ) of RS carrying symbols out of a set of RS carrying symbols ({S1, S2, . . . }) received at the receiving node, the particular RS carrying symbol being comprised in at least one of the at least two subsets (A1, A2, . . . ) of RS carrying symbols;
determining, for the at least one of the at least two subsets (A1, A2, . . . ) of RS carrying symbols, a corresponding hypothesis channel window length (l*) based on a set of channel responses, each channel response in said set of channel responses corresponding to a respective RS carrying symbol of said at least one of the at least two subsets (A1, A2, . . . ) of RS carrying symbols, determining the corresponding hypothesis channel window length (l*) for the at least one of the at least two subsets (A1, A2, . . . ) of RS carrying symbols performed by: 1) calculating a likelihood of each hypothesis channel window length (l) in a set of hypothesis channel window lengths based on samples, taken in the RS carrying symbols comprised in the at least one of the at least two subsets (A1, A2, . . . ) of RS carrying symbols, within the respective hypothesis channel window length (l), and 2) selecting, as the corresponding hypothesis channel window length (l*) for the at least one of the at least two subsets (A1, A2, . . . ) of RS carrying symbols, the hypothesis channel window length with highest likelihood, out of the set of hypothesis channel window lengths; and
determining the channel window length (l ) for the particular RS carrying symbol comprised in the at least one of the at least two subsets (A1, A2, . . . ) of RS carrying symbols based on the determined corresponding hypothesis channel window length (l*).
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