Patent ID: 7305213

Claim:
A receiver, comprising: an antenna which receives a radio signal including N possible symbols {c 1 (n) , c 2 (n) , . . . c M−1 (n) , c M (n) }, where n is an integer satisfying the relation 1<n≦N, each symbol represented by M chips, M is an integer equal to or more than 2; N correlation units corresponding to said N possible symbols, respectively, each correlation unit detecting the degree of correlation with the radio signal received by said antenna; and a symbol determination unit which determines the symbol included in the radio signal received by said antenna based on the degree of correlation detected by said N correlation units, wherein said N correlation units detect the degree of correlation between the radio signal received by said antenna and the N possible symbols represented by M chips {α 0 c 1 (n) , α 0 c 2 (n) +α 1 c 1 (n) , . . . , α 0 c M−1 (n) +α 1 c M−2 (n) , α 0 c M (n) +α 1 c M−1 (n) }, where n is an integer satisfying the relation 1<n≦N, and α 0 and α 1 are non-zero constants, and a ratio bctween said α 0 and α 1 is a ratio between a channel impulse response coefficient of a preceding wave and a channel impulse response coefficient of a one-chip delay wave each included in the radio signal received by said antenna.