Patent ID: 11943088
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A method for a second communication device, the method comprising:
receiving a time domain signal in a radio channel from a first communication device, wherein the received time domain signal is associated with a sequence;
applying Fourier transform to the received time domain signal to obtain the sequence in a frequency domain of the received time domain signal;
obtaining at least one local sequence from a subset of sequences with index q in a set of sequences comprising Q number of subsets of sequences, each subset of sequences comprising A number of orthogonal sequences, wherein any two sequences from different subsets of sequences are non-orthogonal, and wherein q is an integer greater than or equal to 0, Q is a positive integer, and A is an integer greater than 1;
mapping the local sequence onto a subset of subcarriers in a set of subcarriers to obtain the local sequence in the frequency domain, wherein the set of subcarriers are divided into t number of subbands;
phase rotating the local sequence in the frequency domain based on a constant value Δq to obtain a phase rotated local sequence in the frequency domain, wherein the constant value Δq is dependent on the Q number of subsets of sequences, the t number of subbands and the index q of the subset of sequences, and wherein t is a positive integer; and
estimating the radio channel based on the phase rotated local sequence in the frequency domain and the sequence in the frequency domain of the received time domain signal.