Beam forming method adapted to wide band CDMA system
Beam forming method adapted to wide band CDMA system
 CN 1,549,473 B
 Filed: 05/07/2003
 Issued: 12/05/2012
 Est. Priority Date: 05/07/2003
 Status: Active Grant
First Claim
1. one kind is applicable to the wave beam formation method in the broadband CDMA system, and said wave beam formation method may further comprise the steps:
 The array signal carries out the spatial domain to be handled, and said array signal is the baseband signal X of time delay alignment, comprising;
to each frame,During the pilot bit of first time slot;
With the heavily expansion scrambled symbols of known up channel frequency pilot sign signal r as a reference;
Carry out computing crosscorrelation with said baseband signal X;
Obtain crosscorrelation matrix and calculate the suboptimum weights, up to all pilot bit end of first time slot;
During the pilot bit of information symbol position and other time slot;
With said suboptimum weights is initial value;
The heavily expansion scrambled signals that heavily expands scrambled signals and known pilot bits with the information symbol position of despreading descrambling is a reference signal respectively;
Carry out iteration according to minimum mean square error criterion;
Obtain self adaptation suboptimum weights and carry out wave beam formation, obtain Y=W * X with said self adaptation suboptimum weights W;
Wherein, Carry out iteration according to minimum mean square error criterion;
Obtain self adaptation suboptimum weights and carry out wave beam formation, obtain Y=W * X and comprise with said self adaptation suboptimum weights W;
Weights when finishing the pilot bit of first time slot are input to multiplier;
Multiply each other with said baseband signal X, the wave beam that obtains each array element forms signal, forms signal to the wave beam of each array element through synthetic one road signal of adder;
Be input to the calculating iteration error module that heavily expands iteration module and the descrambling module of time domain processing module to this signal respectively again;
Wherein, be input to the signal of the calculating iteration error module that heavily expands iteration module, the quilt during as the error of calculation subtracts vector;
Be divided into I circuitswitched data and Q circuitswitched data after being input to the signal descrambling of descrambling module of time domain processing module, said Q circuitswitched data gets into the despreading module;
Data are handled after utilizing channel estimating and compensating module to despreading, adjudicate again, and the sign bit that obtains is input to and heavily expands iteration module;
During current time is the information symbol position;
The sign bit that obtains after the said judgement is input to the calculating iteration error module that heavily expands iteration module after overweight expansion, scrambling;
Adder signal subtraction with previous input;
Obtain error signal, be input to the spatial domain wave beam and form in the new weights module of calculating of module;
During when current time being the pilot bit of other time slot;
Heavily expand scrambled signals as an input of heavily expanding the calculating iteration error module of iteration module by known up channel pilot bit;
Adder signal subtraction with previous input;
Obtain error signal, be input to the spatial domain wave beam and form in the new weights module of calculating of module;
Judge that weights with the new weights module output of said calculating carry out iteration error that wave beam formation obtains whether within convergence threshold;
As not, then return the array signal and carry out the spatial domain treatment step;
In this way, then preserve said weights, be used for carrying out wave beam and form as said self adaptation suboptimum weights W.
Chinese PRB Reexamination
Abstract
The present invention relates to a beam forming method applicable in wideband codedivision multiple access system, which comprises the steps of carrying out the spatial processing on array signals, wherein the array signals are baseband signals X aligned in time delay; during the pilot bit period of a first time slot, performing the crosscorrelation operation on a symbol obtained through respreading and scrambling a known pilot symbol in an uplink channel for each frame as a reference signal and the baseband signals X, so as to obtain a crosscorrelation matrix r*r=E[Xr*]; calculating a suboptimum weighted value till all pilot bits in the first time slot are over; during the periods of information symbol bits and other time slots, performing the iteration operation on the suboptimum weighted value as an initial value, the respread and scrambled signals of despread and descrambled information symbol bits and the respread and scrambled signals of known pilot bits as reference signals respectively, based on the principle of the minimum mean square error, so as to figure out a selfadaptive suboptimal weighted value W=r*r; and forming beams by means of the suboptimal weighted value W to obtain Y=W*X. The beam forming method simplifies the structure of the system and also greatly reduces the technical difficulty and the amount of calculation.
2 Claims

1. one kind is applicable to the wave beam formation method in the broadband CDMA system, and said wave beam formation method may further comprise the steps:

The array signal carries out the spatial domain to be handled, and said array signal is the baseband signal X of time delay alignment, comprising;
to each frame,During the pilot bit of first time slot;
With the heavily expansion scrambled symbols of known up channel frequency pilot sign signal r as a reference;
Carry out computing crosscorrelation with said baseband signal X;
Obtain crosscorrelation matrix and calculate the suboptimum weights, up to all pilot bit end of first time slot;
During the pilot bit of information symbol position and other time slot;
With said suboptimum weights is initial value;
The heavily expansion scrambled signals that heavily expands scrambled signals and known pilot bits with the information symbol position of despreading descrambling is a reference signal respectively;
Carry out iteration according to minimum mean square error criterion;
Obtain self adaptation suboptimum weights and carry out wave beam formation, obtain Y=W * X with said self adaptation suboptimum weights W;
Wherein, Carry out iteration according to minimum mean square error criterion;
Obtain self adaptation suboptimum weights and carry out wave beam formation, obtain Y=W * X and comprise with said self adaptation suboptimum weights W;
Weights when finishing the pilot bit of first time slot are input to multiplier;
Multiply each other with said baseband signal X, the wave beam that obtains each array element forms signal, forms signal to the wave beam of each array element through synthetic one road signal of adder;
Be input to the calculating iteration error module that heavily expands iteration module and the descrambling module of time domain processing module to this signal respectively again;
Wherein, be input to the signal of the calculating iteration error module that heavily expands iteration module, the quilt during as the error of calculation subtracts vector;
Be divided into I circuitswitched data and Q circuitswitched data after being input to the signal descrambling of descrambling module of time domain processing module, said Q circuitswitched data gets into the despreading module;
Data are handled after utilizing channel estimating and compensating module to despreading, adjudicate again, and the sign bit that obtains is input to and heavily expands iteration module;During current time is the information symbol position;
The sign bit that obtains after the said judgement is input to the calculating iteration error module that heavily expands iteration module after overweight expansion, scrambling;
Adder signal subtraction with previous input;
Obtain error signal, be input to the spatial domain wave beam and form in the new weights module of calculating of module;During when current time being the pilot bit of other time slot;
Heavily expand scrambled signals as an input of heavily expanding the calculating iteration error module of iteration module by known up channel pilot bit;
Adder signal subtraction with previous input;
Obtain error signal, be input to the spatial domain wave beam and form in the new weights module of calculating of module;Judge that weights with the new weights module output of said calculating carry out iteration error that wave beam formation obtains whether within convergence threshold;
As not, then return the array signal and carry out the spatial domain treatment step;
In this way, then preserve said weights, be used for carrying out wave beam and form as said self adaptation suboptimum weights W.


2. a kind of wave beam formation method that is applicable in the broadband CDMA system as claimed in claim 1;
 It is characterized in that it is to be directed against the unique user individual paths that said array signal carries out the spatial domain processing, and multipath and multiuser are the result'"'"'s of said unique user individual paths stacks.
Specification(s)