CDMA receiver
AssigneeNEC Corporation
InventorMotoya Iwasaki
Life of this patent
Estimating the term…
Abstract
A receiver for use in a CDMA communication system, which is designed for a small size, has a plurality of delay units for adding delays over transmission paths to a complex conjugate value of a spreading code, a plurality of multipliers for multiplying the delayed signals outputted from the delay units by complex conjugate values of coefficients representing respective phase/amplitude ratios of the transmission paths, and an adder for adding the product signals outputted from the multiplier, and a despreader for despreading a reception signal using the sum signal outputted from the adder.
Claims7
A receiver comprising:
- despreading code calculating means for calculating a code for despreading a reception signal based on delays given to the reception signal over a plurality of transmission paths through which the reception signal is transmitted and coefficients representing respective phase/amplitude ratios of the transmission paths;
- despreading means for despreading the reception signal using the code calculated by and output directly from said despreading code calculating means;
- and
- integrating means for integrating the reception signal despread by said despreading means.
A receiver comprising:
- memory means for storing a code for despreading a reception signal, calculated in advance based on delays given to the reception signal over a plurality of transmission paths through which the reception signal is transmitted and coefficients representing respective phase/amplitude ratios of the transmission paths;
- despreading means for despreading the reception signal using the code stored by and output directly from said memory means;
- and
- integrating means for integrating the reception signal despread by said despreading means.
Dependencies are inferred from the claim text.