Method of receiving a transmitted signal over a time-varying channel and receiver thereof

A receiver for receiving a transmitted signal over a time-varying channel, the receiver comprising:

• a memory;
• and
• at least one processor communicatively coupled to the memory and configured to perform a method of receiving the transmitted signal over the time-varying channel, the method comprising:
• obtaining a received symbol signal in frequency domain based on the transmitted signal;
• performing a first channel estimation with respect to the time-varying channel based on the received symbol signal to obtain a plurality of first estimated basis expansion model (BEM) coefficients, the time-varying channel being modeled based on a complex-exponential basis expansion model (CX-BEM);
• performing a first equalization based on the received symbol signal and the plurality of first estimated BEM coefficients to obtain a plurality of first detected source symbols;
• and
• performing one or more rounds of a second channel estimation and a second equalization, each round comprising:
• performing the second channel estimation with respect to the time-varying channel based on the received symbol signal and a plurality of detected source symbols to obtain a plurality of second estimated BEM coefficients;
• performing interference removal based on the received symbol signal, the plurality of detected source symbols and the plurality of second estimated BEM coefficients to obtain an interference reduced symbol signal in frequency domain;
• and
• performing the second equalization based on the interference reduced symbol signal and the plurality of second estimated BEM coefficients to obtain a plurality of second detected source symbols.

A computer program product, embodied in one or more non-transitory computer-readable storage mediums, comprising instructions executable by at least one processor to perform a method of receiving a transmitted signal over a time-varying channel, the method comprising:

• obtaining a received symbol signal in frequency domain based on the transmitted signal;
• performing a first channel estimation with respect to the time-varying channel based on the received symbol signal to obtain a plurality of first estimated basis expansion model (BEM) coefficients, the time-varying channel being modeled based on a complex-exponential basis expansion model (CX-BEM);
• performing a first equalization based on the received symbol signal and the plurality of first estimated BEM coefficients to obtain a plurality of first detected source symbols;
• and
• performing one or more rounds of a second channel estimation and a second equalization, each round comprising:
• performing the second channel estimation with respect to the time-varying channel based on the received symbol signal and a plurality of detected source symbols to obtain a plurality of second estimated BEM coefficients;
• performing interference removal based on the received symbol signal, the plurality of detected source symbols and the plurality of second estimated BEM coefficients to obtain an interference reduced symbol signal in frequency domain;
• and
• performing the second equalization based on the interference reduced symbol signal and the plurality of second estimated BEM coefficients to obtain a plurality of second detected source symbols.