Space-time coding method and apparatus in a mobile communication system
Disclosed is a space-time coding apparatus in a mobile communication system. The space-time coding apparatus includes a de-mapper for converting a non-binary symbol into a stream of m×a binary bits, and transmits the stream of binary bits output from the de-mapper via a plurality of antennas. The number of the antennas is m, and a distributor separately distributes the m×a binary bits to the m antennas.
1. A space-time coding apparatus in a mobile communication system, the apparatus including m antennas, the apparatus comprising:
a mapper for mapping a×m×K binary bits into K symbols according to a predetermined mapping rule;
an encoder for encoding the K symbols into N non-binary encoded symbols according to a predetermined code rate and coding scheme;
a de-mapper for de-mapping the N non-binary encoded symbols into a×m×N binary bits according to a de-mapping rule corresponding to the mapping rule; and
a distributor for dividing the a×m×N binary bits into N bit streams, and distributing each of the N bit streams such that the a×m binary bits constituting the bit stream are sequentially transmitted via the m antennas, respectively.
2. The space-time coding apparatus of claim 1 , further comprising m signal mappers each of which maps binary bits distributed by the distributor into a modulation symbol according to a predetermined constellation and transmits the modulation symbol via a corresponding antenna.
3. The space-time coding apparatus of claim 1 , wherein the mapper maps the a×m×K binary bits into the K symbols on a Galois field.
4. The space-time coding apparatus of claim 1 , wherein the de-mapper de-maps the N non-binary encoded symbols into the a×m×N binary bits on a Galois field.
5. A method for controlling a space-time coding apparatus in a mobile communication system, the apparatus including m antennas, the method comprising the steps of:
mapping a×m×K binary bits into K symbols according to a predetermined mapping rule;
encoding the K symbols into N non-binary encoded symbols according to a predetermined code rate and coding scheme;
de-mapping the N non-binary encoded symbols into a×m×N binary bits according to a de-mapping rule corresponding to the mapping rule; and
dividing the a×m×N binary bits into N bit streams, and distributing each of the N bit streams such that the a×m binary bits constituting the bit stream are sequentially transmitted via the m antennas, respectively.
6. The method of claim 5 , further comprising the step of mapping binary bits distributed separately to the m antennas into a modulation symbol according to a predetermined constellation before transmission.
7. The method of claim 5 , wherein the mapping step comprises the step of mapping the a×m×K binary bits into the K symbols on a Galois field.
8. The method of claim 5 , wherein the step de-mapping comprises the step of de-mapping the N non-binary encoded symbols into the a×m×N binary bits on a Galois field.