Bit mapping/demapping method and apparatus for communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsSe Ho MYUNG, Jae Yoel Kim, Yeon Ju Lim, Sung Ryul Yun, Hak Ju Lee
Life of this patent
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Abstract
An improved bit mapping method and apparatus for a communication system is provided. A bit mapping method of the present invention includes arranging coded bits in a codeword in an order of recovery capability; setting a shift region including a number of coded bits; rearranging the coded bits in the shift region by shifting the shift region by a number of bits equal to a number of bits that is indicated by a shift factor; and mapping the rearranged coded bits into a modulation symbol in an order of reliability from a lowest reliability bit position to a highest reliability bit position of the modulation symbol.
Claims14
A bit mapping method for a communication system, comprising the steps of:
- arranging coded bits in a codeword in an order of recovery capability;
- setting a shift region including a number of coded bits;
- rearranging the coded bits in the shift region by shifting the shift region by a number of bits equal to a number of bits that is indicated by a shift factor;
- mapping the rearranged coded bits into a modulation symbol in an order of reliability from a lowest reliability bit position to a highest reliability bit position of the modulation symbol.
A bit demapping method for a communication system, comprising the steps of:
- extracting a shift factor from a signal demodulated from a received signal;
- demapping the demodulated signal to obtain a codeword of coded bits;
- and
- rearranging the coded bits in the codeword by shifting a shift region by a number of bits equal to a number of bits indicated by the shift factor.
A bit mapping apparatus for a communication system, comprising:
- a controller wfor arranging coded bits in a codeword in an order of recovery capability, setting a shift region including a number of coded bits, and generating a shift factor;
- a bit shifter for rearranging the coded bits by shifting the shift region by a number of bits equal to a number of bits that is indicated by the shift factor;
- and
- a bit mapper for mapping the rearranged coded bits into a modulation symbol in an order of reliability from a lowest reliability bit position to a highest reliability bit position of the modulation symbol.
A bit demapping apparatus for a communication system, comprising:
- a demodulator for demodulating a received signal and outputting the demodulated signal;
- a controller for extracting a shift factor from the demodulated signal and determining a shift scheme based on the shift factor;
- a bit demapper for demapping the demodulated signal to obtain a codeword of coded bits;
- and
- a bit shifter for rearranging the coded bits in the codeword by shifting a shift region by a number of bits equal to a number of bits indicated by the shift factor.
Dependencies are inferred from the claim text.