Patent ID: 6256341
Filing Date: 2001-07-03
Classification: H04B

Abstract:
A spread spectrum receiver for de-spreading reception signals subjected to spectrum spreading and modulation, comprising:m stages of coefficient registers (where m is an integer of 2 or more), each storing corresponding one of spreading code coefficients of m chips from a spreading code sequence for de-spreading;m stages of taps, each multiplying the spreading code coefficient stored in corresponding one of said m stages of said coefficient registers by the reception signal to obtain a multiplication result, and outputting the multiplication result;m stages of delay elements provided in one-to-one correspondence to said m stages of taps, respectively, each for delaying an input by one chip and outputting an output signal;m stages of adders, said adder of an i-th stage (where i is an arbitrary one of integers of 2 to m) among second to m-th stages of said m stages of adders adding a multiplication result outputted from said tap of an i-th stage to an addition result outputted from said adder of an (i-1)-th stage through said delay element of a corresponding (i-1)-th stage to obtain an addition result and outputting the addition result, and said adder of a first stage adding a multiplication result outputted from said tap of the first stage to an addition result of said adder of the m-th stage through said delay element of the corresponding m-th stage and outputting an addition result; anda switch for outputting the addition result outputted from said delay element of the m-th stage among said m stages of said delay elements as either one of an output as a correlation value or an input to said adder of the first stage among said m stages of said adders.