Method and arrangement for use in a single user detector for a CDMA multi-path system
AssigneeIP Wireless, Inc.
InventorSteven Nicholas Geers
Life of this patent
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Abstract
A method and arrangement for use in a single user detector in a CDMA multi-path system, comprising providing a finite impulse response (FIR) filter; and configuring the FIR filter to derive at least a first, then a second, then a third, then a fourth of the following parameters for single user detection: R (auto-correlation) function; L (Cholesky decomposition) value; X value representative of the complex conjugate of a channel impulse response multiplied and summed with time shifted versions of a received signal; back substitution value Y (function of R, X and L); and back substitution value S (function of R, X, Y and L).
Claims16
A method for utilizing a single configurable finite impulse response (FIR) filter for use in a single user detector in a code division multiple access (CDMA) multi-path system, comprising:
- providing a single finite impulse response (FIR) filter;
- configuring the FIR filter to derive at least a first, then a second, then a third, then a fourth of the following parameters for single user detection:
- auto correlation function R,
- X value representative of the complex conjugate of a channel impulse response multiplied and summed with time shifted versions of a received signal,
- back substitution value Y determined from a first set of linear equations, wherein the back substitution value Y is a function of the auto correlation function R, the X value, and a Cholesky decomposition value L, and
- back substitution value S determined from a second set of linear equations, wherein the back substitution value S is a function of the auto correlation function R, the X value, the back substitution value Y, and the L value;
- and
- using the auto correlation function R, the X value, the back substitution value Y, and the back substitution value S in the single user detector to recover single user data transmitted from a transmitter.
An arrangement for utilizing a single configurable finite impulse response (FIR) filter for use in a single user detector in a code division multiple access (CDMA) multi-path system, comprising:
- a single finite impulse response (FIR) filter;
- means for configuring the FIR filter to derive at least a first, then a second, then a third, then a fourth of the following parameters for single user detection:
- auto correlation function R,
- X value representative of the complex conjugate of a channel impulse response multiplied and summed with time shifted versions of a received signal,
- back substitution value Y determined from a first set or linear equations, wherein the back substitution value Y is a function of the auto correlation function R, the X value, and a Cholesky decomposition value L, and
- back substitution value S determined from a second set of linear equations, wherein the back substitution value S is a function of the auto correlation function R, the X value, the back substitution value Y, and the L value;
- and
- means for using the auto correlation function R, the X value, the back substitution value Y, and the back substitution value S to recover single user data transmitted from a transmitter.
Dependencies are inferred from the claim text.