US 6,389,058 B1 · Apparatus and method for performing fast acquisition of PN sequences by transferring distributed samples

Abstract

This invention is to provide an apparatus and method for performing fast distributed sample acquisition (DSA) which is applicable to DS/CDMA system with a long-period PN sequence. The apparatus includes a spreader which generates a data signal by spreading an incoming data stream over a predetermined range of spectrum according to a locally generated first main sequence and samples the state sample of said main sequence, a sample spreader which makes the state sample output from a spreader corresponding to one of binary orthogonal symbols having a predetermined length and outputs a first state signal by spreading the symbol according to a locally generated first subsequence, a sample despreader which reconstructs the transmitted binary orthogonal symbols by despreading the first state signal obtained from the sample spreader according to a locally generated second subsequence and therefrom detects the state sample of the first main sequence, and a despreader which compares the state sample obtained from the sample despreader with a locally generated state sample and makes correction on the SRG installed within itself as many as a predetermined number of times, generates a second main sequence having new states, and reconstructs the incoming data stream by despreading the data signal obtained from the spreader according to the second main sequence.

Claims14

Dependent claims

An apparatus for performing a fast acquisition of PN sequence by transmitting a distributed sample, comprising:

a first spreader to spread a data stream over a prescribed spectrum by using a locally generated first main sequence and to sample a state of the first main sequence;
a sample spreader to receive a first state sample from the first spreader, to generate at least one corresponding binary orthogonal symbol having a prescribed length, and to output a first state signal generated by spreading the at least one binary orthogonal symbol according to a locally generated first igniter sequence;
a sample despreader coupled to reconstruct the at least one binary orthogonal symbol by despreading the first state signal received from the sample spreader according to a locally generated second igniter sequence, and to detect the first state sample of the first main sequence therefrom;
and
a first despreader to execute a comparison-correction operation on the first state sample received from the sample despreader using a locally generated second state sample for a prescribed number of times, to generate a second main sequence having a new state, and to reconstruct the data stream by despreading a data signal received from the first spreader according to the second main sequence.

2 more elements

An apparatus for performing a fast acquisition of a PN sequence, comprising:

a first despreader configured to receive and reconstruct at least one binary orthogonal symbol by despreading a first state signal received from a transmitter using a locally generated igniter sequence and detecting a first state sample of a first main sequence from the first state signal;
and
a second despreader coupled to the first despreader to receive the first state sample and generate a second state sample a prescribed number of times, and generate a second main sequence having a state that is different than a state of the first main sequence, and to reconstruct a data stream by despreading a data signal received from the transmitter according to the second main sequence.

Dependencies are inferred from the claim text.

Apparatus and method for performing fast acquisition of PN sequences by transferring distributed samples

Life of this patent

Apparatus and method for performing fast acquisition of PN sequences by transferring distributed samples

Life of this patent

Abstract

Claims14