| 摘要 |
PROBLEM TO BE SOLVED: To overcome the problem of a conventional demodulation correlation unit adopting the multi-carrier spread spectrum communication system or the orthogonal modulation spread spectrum communication system that has conducted frequency conversion to a base band signal and a correlation arithmetic operation of a spread code by separate circuits and has required provision of a highly accurate analog/digital converter in addition. SOLUTION: This invention proposes a demodulation correlation device that is provided with a coefficient output means that respectively outputs a product between a code sequence value and a sine wave with a carrier frequency corresponding to each carrier of a multi-carrier spread spectrum signal by each carrier, an arithmetic means that respectively multiplies the received multi- carrier spectrum signal with an output signal of the coefficient output means, a ΔΣ modulation means that applies ΔΣ modulation to an output signal of the arithmetic means, and a digital accumulation means that accumulates digital output signals of the ΔΣmodulation means and outputs its arithmetic result as a correlation value of the code sequence. |
