Patent ID: 7782966
Filing Date: 2010-08-24
Classification: H04L

Abstract:
1. A base station demodulator for demodulating channel quality information (CQI) or an automatic repeat request (ARQ) response signal transmitted from a subscriber station to a base station, the base station demodulator comprising: a vector index demodulator for demodulating quadrature phase shift keying (QPSK) modulation signals transmitted by using m subcarriers in a tile by multiplying the QPSK modulation signals, in parallel, by m conjugate complexes corresponding to the m subcarriers, and determining the greatest value of the demodulation results as a vector index when the CQI tiles or the ARQ acknowledgement/negative-acknowledgement (ACK/NACK) channel tiles are sequentially inputted; and a channel value detector for inputting n vector indexes demodulated by the vector index demodulator to a first shift register, inputting n subsequent vector indexes to a second shift register, performing the above vector index input to the first and second shift registers m-times, and detecting a channel value for the CQI or the ARQ ACK/NACK; wherein m and n are integers.