US 8,275,078 B2 · Method and apparatus for signal detection

Abstract

In order to reduce the complexity of complex signal correlator and realize algorithm optimization, the present invention provides a method and an apparatus for implement complex signal correlation by means of shifter and adder instead of complex multiplier. In the method, the amplitude and radial angle of a corresponding received symbol is firstly adjusted based on a pre-stored local reference symbol. Then, the radial angle of the adjusted received signal is rotated based on a corresponding interchange indicator. Finally, all the processed received signals are combined to obtain a final complex correlation signal. With this method, the chip size and computing load can be greatly reduced.

Claims20

Dependent claims

A correlation method for complex signal, which is designed for processing one received signal and comprises steps of:

a) for each received symbol in said received signal, adjusting respectively the amplitude and radial angle of said received symbol based on one corresponding local reference symbol in one corresponding local reference signal so as to generate one corresponding adjusted received symbol;
b) rotating the radial angle of each adjusted received symbol based on one corresponding interchange indicator so as to generate one corresponding processed received symbol;
and
c) combining all of said processed received symbols to obtain one complex correlation signal.

1 more element

A complex signal correlator for detecting one received signal, comprising:

a first memory for storing said received signal which includes a plurality of received symbols;
a second memory for storing one local reference signal which includes a plurality of local reference symbols;
a processor for processing said received signal based on said local reference signal to generate a processed received signal and comprising a plurality of shifter pairs and a plurality of interchangers, wherein each shifter pair includes two shifters and is configured to adjust the amplitude and radial angle of one of said received symbols correspondingly based on the real and imaginary parts of one of said local reference symbols so as to generate correspondingly one adjusted received symbol, and each interchanger. is configured to rotate the radial angle of said adjusted received symbol based on the value of one corresponding interchange indicator so as to generate one processed received symbol;
and
a complex signal synthesizer for combining all of said processed received symbols to obtain one complex correlation signal.

2 more elements

A receiver for wireless communication system, comprising:

a front-end processor for receiving a radio frequency signal and converting it into a received signal;
a complex signal correlator for processing said received signal to obtain a complex correlation signal and comprising:
a first memory for storing said received signal which includes a plurality of received symbols;
a second memory for storing one local reference signal which includes a plurality of local reference symbols;
a processor for processing said received signal based on said local reference signal to generate a processed received signal and comprising a plurality of shifter pairs and a plurality of interchangers, wherein each shifter pair includes two shifters and is configured to adjust the amplitude and radial angle of one of said received symbols correspondingly based on the real and imaginary parts of one of said local reference symbols so as to generate correspondingly one adjusted received symbol, and each interchanger is configured to rotate the radial angle of said adjusted received symbol based on the value of one corresponding interchange indicator so as to generate one processed received symbol;
and
a complex signal synthesizer for combining all of said processed received symbols to obtain one complex correlation signal;
and
a detector for detecting correlation peak from said complex correlation signal to detect reception synchronization.

6 more elements

Dependencies are inferred from the claim text.

Method and apparatus for signal detection

Life of this patent

Method and apparatus for signal detection

Life of this patent

Abstract

Claims20