Reception circuit in spread spectrum communication system

Abstract

Abstract PURPOSE:To allow the circuit to trace the fluctuation of a correlation peak point of time without reducing S/N by coupling organically a correlation circuit taking correlation between a reception code string and a detection pseudo noise code, a deciding circuit deciding the polarity of an output value of the correlation circuit, a maximum value detection circuit, a ring counter and a storage circuit or the like. CONSTITUTION:The correlation circuit 1 takes correlation between the reception code string and the detection pseudo noise code and a maximum value of its output signal phi(f) is detected by a sample-and-hold circuit 21 in the reception circuit. When a coefficient value of the ring counter is N, a coefficient value (N-1) is stored in (N-1) storage circuits 23, 24 and its content is stored in timing storage circuits 27-29 in response to a signal from a timing signal generating circuit 26. When the content of fetched in latch circuits 31-33 is coincident with the content of the (N-1) storage circuit, a sample signal E is generated, and also an output of a deciding circuit 3 deciding the polarity of the output value of the correlation circuit is fetched in a flip-flop 5 in response to the said sample signal E and outputted as an information data.

Inventors

• 👤 Kenichi Onishi
• 👤 謙一 大西

Bibliographic Details