Patent ID: 7058143

Claim:
A correlation system including a frequency adding means having a predetermined plurality n of multiplying means (EXOR), an adder, a spreader, and a correlator, wherein the predetermined plurality n of multiplying means (EXOR) each receives a corresponding frequency component (F 1 –Fn) and a symbol data DO(t) as a base and multiplies both of the corresponding frequency component (F 1 –Fn) and said symbol data DO(t) to output a multiplied symbol data D 1 (t)–Dn(t), wherein n and t are integers, the adder receives said multiplied symbol data D 1 (t)–Dn(t) from a respective multiplying means (EXOR) and said symbol data DO(t) as the base and performs an adding process for said multiplied symbol data and said symbol data DO(t) to output a resultant additional symbol data D(t), the spreader receives a spread signal of said additional symbol data D(t) and superposes thereon a spread code L(t) to output a corrected reference signal R(t), and the correlator receives said corrected reference signal R(t) and a measurement signal S(t) and takes a correlation between said corrected reference signal R(t) and said measurement signal S(t) to output a correlation output signal.