| 摘要 |
PURPOSE: A turbo decoder in a mobile communication base station is provided to reduce hardware complexity in designing a chip set and variably use values of a look up table using a power control bit. CONSTITUTION: A selector(100) receives a power control bit among a transmission signal inputted through a demodulator. The selector(100) confirms the number of '0' and '1' in a power control bit and determines a Sel value according the number of confirmed '0' and '1'. A look up table(200) obtains and stores a deviation of a channel noise obtained in an initial synchronization of a mobile communication base station. A multiplexer(300) multiplies the Sel value from the selector(100) by an L value from the look up table(200) and outputs a channel noise N. A BM calculator(400) calculates a branch matrix using xk and yk from a demodulator an N from the multiplexer(300).
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