Memory system and operating method thereof

A memory system comprising:

• a nonvolatile memory device having an observation memory cell and a plurality of interference memory cells adjacent to the observation memory cell;
• and
• a controller to control the nonvolatile memory device, wherein:
• the nonvolatile memory device includes a reading/writing circuit to read the observation memory cell and the interference memory cells at least one time with different read voltages, and
• the controller comprises:
• a first data buffer unit to store a first read data symbol which is configured with data of the read observation memory cell;
• a second data buffer unit to store second read data symbols which are respectively configured with data of the read interference memory cells;
• and
• a determination unit to determine a logical value of the observation memory cell, based on the first read data symbol and the second read data symbols.

A method of operating a memory system including at least one nonvolatile memory device, the method comprising:

• receiving data from at least one memory cell of a selected word line of the nonvolatile memory device, determining a first read data symbol, and storing the first read data symbol in a first data buffer;
• receiving data from memory cells of an unselected word line of the nonvolatile memory device that are adjacent to the at least one memory cell of the selected word line, and storing the received data in a second data buffer;
• and
• determining the interference that a first memory cell of the at least one memory cell of a selected word line receives from the memory cells of the unselected word line.