Registered
DEMODULATOR OF BASE STATION IN ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS
- Inventors
-
Young Ha Lee, 박윤옥
- Application No.
-
11721155 (2005.11.09)
- Publication No.
-
20090225904 (2009.09.10)
- Registration No.
- 7782966 (2010.08.24)
- Country
- UNITED STATES
- Abstract
- A base station demodulator according to the exemplary embodiment of the present invention includes a vector index demodulator, and a channel value detector. The vector index demodulator demodulates CQI or ARQ ACK/NACK channels by multiplying QPSK modulation signals transmitted as m subcarriers in a tile by m conjugate complexes corresponding to the m subcarriers, and determines the greatest value of the demodulation results as a vector index. The channel value detector inputs n vector indexes demodulated by the vector index demodulator to a first shift register, inputs n subsequent vector indexes to a second shift register, and detects a channel value for the CQI or the ARQ ACK/NACK by repeating the above vector index input to the first and second shift registers m-times.
- KSP Keywords
- Frequency division, Frequency division multiple access(FDMA), Orthogonal Frequency Division Multiple Access(OFDMA), QPSK modulation, Shift Register, base station(BS), multiple access