Decoding error correcting codes transmitted through multiple wire twisted pair cables with uneven noise on the wires
Decoding error correcting codes transmitted through multiple wire twisted pair cables with uneven noise on the wires
 CN 1,770,674 B
 Filed: 09/27/2005
 Issued: 12/12/2012
 Est. Priority Date: 09/28/2004
 Status: Active Grant
First Claim
1. the metric maker at the communications receiving equipment internal implementation is characterized in that, comprising:
 Input is used for;
Receive the first centrifugal pump modulation symbol, this symbol is corresponding to first signal path with first signal to noise ratio;
Receive the second centrifugal pump modulation symbol, this symbol is corresponding to the secondary signal path with second signal to noise ratio;
Metric computing function property module is used for;
Use amplification factor, the said first signal path noise variance and the said first signal path criteria for noise deviation to calculate the first symbol metric corresponding to the said first centrifugal pump modulation symbol with first signal to noise ratio with first signal to noise ratio;
Use said amplification factor, said secondary signal approach noise variance and said secondary signal approach noise standard deviation to calculate the second symbol metric corresponding to the said second centrifugal pump modulation symbol with second signal to noise ratio with second signal to noise ratio;
Said amplification factor is carried out accommodation according to the variation of condition;
Output is used for providing to errorcorrecting code decoder each symbol metric of said calculating;
The said first symbol metric is first and second '"'"'s a product;
Said first formula is;
Wherein, σ
_{a}It is the first signal path criteria for noise deviation with first signal to noise ratio;
Said second is exponential quantity, and its formula is;
Wherein, σ
_{a}^{2}Be the first signal path noise variance with first signal to noise ratio, a is said amplification factor;
The said second symbol metric adopts and the identical account form of the first symbol metric, wherein, and σ
_{a}Be secondary signal approach noise standard deviation with second signal to noise ratio, σ
_{a}^{2}Be the secondary signal approach noise variance with second signal to noise ratio, a is an amplification factor;
Said D _{SE}(y, s) be transmit y and receive Euclidean distance between the signal s square.
Chinese PRB Reexamination
Abstract
Decoding error correcting codes transmitted through multiple wire twisted pair cables with uneven noise on the wires. A novel approach is presented by which the metrics may be calculated for signals received over multiwire (or alternatively referred to as multichannel, and/or multipath) communication channels to exploit an uneven distribution of noise among those wires for improved performance. In addition, this approach may also be performed in combination with employing an amplification factor to modify the metrics employed when performing ECC (Error Correcting Code) decoding. Moreover, when information is known concerning which 1 or more paths (e.g., wires) has an SNR that is different (e.g., lower in some cases) from the others, an even better adapted means of calculating the metrics associated with each of the paths (e.g., wires) may be employed to provide for improved performance with respect to iterative decoding processing of signals encoded using ECCs.
6 Claims

1. the metric maker at the communications receiving equipment internal implementation is characterized in that, comprising:

Input is used for; Receive the first centrifugal pump modulation symbol, this symbol is corresponding to first signal path with first signal to noise ratio; Receive the second centrifugal pump modulation symbol, this symbol is corresponding to the secondary signal path with second signal to noise ratio; Metric computing function property module is used for; Use amplification factor, the said first signal path noise variance and the said first signal path criteria for noise deviation to calculate the first symbol metric corresponding to the said first centrifugal pump modulation symbol with first signal to noise ratio with first signal to noise ratio; Use said amplification factor, said secondary signal approach noise variance and said secondary signal approach noise standard deviation to calculate the second symbol metric corresponding to the said second centrifugal pump modulation symbol with second signal to noise ratio with second signal to noise ratio; Said amplification factor is carried out accommodation according to the variation of condition; Output is used for providing to errorcorrecting code decoder each symbol metric of said calculating; The said first symbol metric is first and second '"'"'s a product; Said first formula is;
Wherein, σ
_{a}It is the first signal path criteria for noise deviation with first signal to noise ratio;
Said second is exponential quantity, and its formula is;
Wherein, σ
_{a}^{2}Be the first signal path noise variance with first signal to noise ratio, a is said amplification factor;
The said second symbol metric adopts and the identical account form of the first symbol metric, wherein, and σ
_{a}Be secondary signal approach noise standard deviation with second signal to noise ratio, σ
_{a}^{2}Be the secondary signal approach noise variance with second signal to noise ratio, a is an amplification factor;
Said D _{SE}(y, s) be transmit y and receive Euclidean distance between the signal s square.


2. metric maker according to claim 1 is characterized in that:

Said input is used to receive the 3rd centrifugal pump modulation symbol, and this symbol is corresponding to the 3rd signal path with said second signal to noise ratio; Said metric computing function property module is used to utilize the signal path noise variance of said amplification factor, said second signal to noise ratio and the signal path criteria for noise deviation of said second signal to noise ratio to calculate the 3rd symbol metric corresponding to said the 3rd centrifugal pump modulation symbol; Said the 3rd symbol metric adopts and the identical account form of the first symbol metric, wherein, and σ
_{a}Be the signal path criteria for noise deviation of second signal to noise ratio, σ
_{a}^{2}Be the signal path noise variance of second signal to noise ratio, a is said amplification factor.


3. metric maker according to claim 1 is characterized in that:

Said metric maker is implemented in communication sink, and this communication sink is used to receive the signal through a plurality of signal path emissions, and wherein, said a plurality of signal paths comprise said first signal path and said secondary signal path; Said a plurality of signal path comprises 4 cables in the 4 line twistedpair feeders, and they link together with said communication sink.


4. metric maker at the communications receiving equipment internal implementation comprises:

Input is used for; Receive the first centrifugal pump modulation symbol, this symbol is corresponding to first signal path with first signal to noise ratio; Receive the second centrifugal pump modulation symbol, this symbol is corresponding to the secondary signal path with second signal to noise ratio; Receive the 3rd centrifugal pump modulation symbol, this symbol is corresponding to the 3rd signal path with said second signal to noise ratio; Receive the 4th centrifugal pump modulation symbol, this symbol is corresponding to the 4th signal path with said second signal to noise ratio; A kind of metric computing function property module is used for; Use the signal path criteria for noise deviation of amplification factor, the said first signalnoise ratio signal approach noise variance and said first signal to noise ratio to calculate the first symbol metric corresponding to the said first centrifugal pump modulation symbol; Use the signal path criteria for noise deviation of said amplification factor, the said second signalnoise ratio signal approach noise variance and said second signal to noise ratio to calculate the second symbol metric corresponding to the said second centrifugal pump modulation symbol; Use the signal path criteria for noise deviation of said amplification factor, the said second signalnoise ratio signal approach noise variance and said second signal to noise ratio to calculate the 3rd symbol metric corresponding to said the 3rd centrifugal pump modulation symbol; Use the signal path criteria for noise deviation of said amplification factor, the said second signalnoise ratio signal approach noise variance and said second signal to noise ratio to calculate the 4th symbol metric corresponding to said the 4th centrifugal pump modulation symbol; Said amplification factor is carried out accommodation according to the variation of condition; Output is used for providing to errorcorrecting code decoder each symbol metric of said calculating; The said first symbol metric is first and second '"'"'s a product; Said first formula is;
Wherein, σ
_{a}It is the first signal path criteria for noise deviation with first signal to noise ratio;
Said second is exponential quantity, and its formula is;
Wherein, σ
_{a}^{2}Be the first signal path noise variance with first signal to noise ratio, a is said amplification factor;
The said second symbol metric adopts and the identical account form of the first symbol metric, wherein, and σ
_{a}Be the signal path criteria for noise deviation of second signal to noise ratio, σ
_{a}^{2}Be the second signalnoise ratio signal approach noise variance, a is an amplification factor;
Said the 3rd symbol metric adopts and the identical account form of the first symbol metric, wherein, and σ
_{a}Be the signal path criteria for noise deviation of second signal to noise ratio, σ
_{a}^{2}Be the second signalnoise ratio signal approach noise variance, a is an amplification factor;
Said the 4th symbol metric adopts and the identical account form of the first symbol metric, wherein, and σ
_{a}Be the signal path criteria for noise deviation of second signal to noise ratio, σ
_{a}^{2}Be the second signalnoise ratio signal approach noise variance, a is an amplification factor;
Said D _{SE}(y, s) be transmit y and receive Euclidean distance between the signal s square.


5. method that is used for the compute sign metric comprises:

Receive the first centrifugal pump modulation symbol, this symbol is corresponding to first signal path with first signal to noise ratio; Receive the second centrifugal pump modulation symbol, this symbol is corresponding to the secondary signal path with second signal to noise ratio; Use the signal path criteria for noise deviation of amplification factor, the said first signalnoise ratio signal approach noise variance and said first signal to noise ratio to calculate the first symbol metric corresponding to the said first centrifugal pump modulation symbol; Use the signal path criteria for noise deviation of said amplification factor, the said second signalnoise ratio signal approach noise variance and said second signal to noise ratio to calculate the second symbol metric corresponding to the said second centrifugal pump modulation symbol; Said amplification factor is carried out accommodation according to the variation of condition; In the error correction decoding process of carrying out signal, use said first symbol metric and the said second symbol metric; The said first symbol metric is first and second '"'"'s a product; Said first formula is;
Wherein, σ
_{a}It is the first signal path criteria for noise deviation with first signal to noise ratio;
Said second is exponential quantity, and its formula is;
Wherein, σ
_{a}^{2}Be the first signal path noise variance with first signal to noise ratio, a is said amplification factor;
The said second symbol metric adopts and the identical account form of the first symbol metric;
wherein, and σ
_{a}Be the signal path criteria for noise deviation of second signal to noise ratio, σ
_{a}^{2}Be the signal path noise variance of second signal to noise ratio, a is an amplification factor;
Said D _{SE}(y, s) be transmit y and receive Euclidean distance between the signal s square.


6. communication equipment comprises:

AFE(analog front end) is used for; From the communication channel that comprises one group of cable, receive continuous time signal;
It is characterized in that;
First subclass of said one group of cable comprises the first signalnoise ratio signal approach noise variance and the said first signalnoise ratio signal approach noise standard deviation, and second subclass of said one group of cable comprises the second signalnoise ratio signal approach noise variance and the said second signalnoise ratio signal approach noise standard deviation;
Comprise the path in the cable subclass;
The path that first subclass comprises has the first signalnoise ratio signal approach noise variance and the first signalnoise ratio signal approach noise standard deviation, and the path that second subclass comprises has the second signalnoise ratio signal approach noise variance and the second signalnoise ratio signal approach noise standard deviation;To receive conversion of signals continuous time is discretetime signal;
Employed method is;
carry out initialization process;
Obtain first group of discrete time and receive signal, its modulation rate is corresponding to said first subclass of said one group of cable, simultaneously;
Obtain second group of discrete time and receive signal, its modulation rate is corresponding to said second subclass of said one group of cable;The metric maker is used for; Said first group of discrete time received signal and said second group of discrete time, and to receive conversion of signals is a centrifugal pump modulation symbol sequence and compute sign metric, and this modulation symbol sequence comprises corresponding to first group of centrifugal pump modulation symbol of first subclass of said one group of cable with corresponding to second group of centrifugal pump modulation symbol of second subclass of said one group of cable; Use amplification factor, the signal path noise variance of said first signal to noise ratio and the signal path criteria for noise deviation calculation first group code metric of said first signal to noise ratio, this metric is corresponding at least one centrifugal pump modulation symbol of said first group of centrifugal pump modulation symbol; Use the signal path criteria for noise deviation calculation second group code metric of the signal path noise variance and said second signal to noise ratio of said amplification factor, said second signal to noise ratio, this metric is corresponding at least one centrifugal pump modulation symbol of said second group of centrifugal pump modulation symbol;
Said amplification factor is carried out accommodation according to the variation of condition;Decoder;
Be used for said first group of discrete time being received signal and said second group of discrete time reception signal execution error correction decode process;
Use said first group code metric and the said second group code metric, generate the best estimate of centrifugal pump modulation symbol sequence and coded information bits wherein;Each symbol metric of the said first group code metric is first and second '"'"'s a product; Said first formula is;
Wherein, σ
_{a}It is the first signal path criteria for noise deviation with first signal to noise ratio;
Said second is exponential quantity, and its formula is;
Wherein, σ
_{a}^{2}Be the first signal path noise variance with first signal to noise ratio, a is said amplification factor;
The said second group code metric adopts and the identical account form of the first group code metric, wherein, and σ
_{a}Be the signal path criteria for noise deviation of second signal to noise ratio, σ
_{a}^{2}Be the signal path noise variance of second signal to noise ratio, a is an amplification factor;
Said D _{SE}(y, s) be transmit y and receive Euclidean distance between the signal s square.

Specification(s)