US 5,506,865 A · Pilot carrier dot product circuit

Abstract

An method and apparatus for computing a scalar projection of a vector onto another vector. The apparatus comprises a multiplying circuit and a summing circuit. The multiplying circuit is for multiplying a value representative of a first component of a first vector with a value representative of a first component of a second vector to provide a first intermediate value, and for multiplying a value representative of a second component of a first vector with a value representative of a second component of a second vector to provide a second intermediate value. The summing circuit sums the first and second intermediate values to provide a resultant value representative of the scalar projection of the first vector onto the second vector. The apparatus may further comprise a storing circuit and a selection circuit. The storing circuit is for storing the values representative of the first and second components of the first vector, and the values representative of the first and second components of the second vector. The selection circuit provides an ordered supply of these values to the multiplying circuit.

Claims23

Dependent claims

Apparatus for determining a relative magnitude for a portion of a data signal in a communication system which is in phase with a reference signal for that communication system comprising:

means for extracting first and second components of a reference signal;
means for extracting first and second components of a data signal, wherein said reference signal and said data signal are received over a common signal transfer path;
means for generating a product of said first components of said data and reference signals to provide a first intermediate value, and for generating a product of said second components of said data and reference signals to provide a second intermediate value;
and
means for summing said first and second intermediate values.

2 more elements

Apparatus for extracting data from a received signal in a communication system comprising:

a receiver for receiving a signal, said signal comprising one or more multipath propagations of the same transmitted signal emanating from one or more base stations, said transmitted signal comprising a data signal and a reference signal;
one or more demodulators, coupled in parallel to said receiver, each demodulator operating on a particular propagation of said multipath propagations, each of said demodulators comprising:
means for extracting in-phase (I) and quadrature phase (Q) components of the data signal from said particular propagation, and
means for extracting I and Q components of the reference signal from said particular propagation;
one or more dot product means, each coupled to a corresponding one of said demodulators, for determining for each particular propagation a relative magnitude of a portion of said data signal which is in phase with said reference signal, each of said dot product means comprising:
means for generating a product of said I components of said data and reference signals to provide a first intermediate value, and for generating a product of said Q components of said data and reference signals to provide a second intermediate value, and
first summing means for summing said first and second intermediate values to provide a first data output;
and
second summing means for summing said first data outputs.

6 more elements

Dependencies are inferred from the claim text.

Pilot carrier dot product circuit

Life of this patent

Pilot carrier dot product circuit

Life of this patent

Abstract

Claims23