초록 ▼

Multibit symbols from a signal that is received on a communications channel are decoded by combining a matched filtered signal that is derived from input signal samples, and hard decisions that are derived from the input signal samples, in order to obtain soft symbol values. MLSE-PSP processing may

Multibit symbols from a signal that is received on a communications channel are decoded by combining a matched filtered signal that is derived from input signal samples, and hard decisions that are derived from the input signal samples, in order to obtain soft symbol values. MLSE-PSP processing may be performed on prefiltered input signal samples to obtain the hard decisions. The original, unprefiltered input signal samples also may be match filtered to determine improved soft information, to thereby allow the symbol decisions to be refined over and the above the result provided by MLSE-PSP. The soft symbol values then may be processed to obtain soft bit values for each bit of the multibit symbols. In particular, the soft symbol values may be converted to soft bit values and interleaved to provide soft, coded bit values. Error correction decoding then may be applied to the soft, coded bit values to provided the decoded bits.

대표청구항 ▼

Multibit symbols from a signal that is received on a communications channel are decoded by combining a matched filtered signal that is derived from input signal samples, and hard decisions that are derived from the input signal samples, in order to obtain soft symbol values. MLSE-PSP processing may

Multibit symbols from a signal that is received on a communications channel are decoded by combining a matched filtered signal that is derived from input signal samples, and hard decisions that are derived from the input signal samples, in order to obtain soft symbol values. MLSE-PSP processing may be performed on prefiltered input signal samples to obtain the hard decisions. The original, unprefiltered input signal samples also may be match filtered to determine improved soft information, to thereby allow the symbol decisions to be refined over and the above the result provided by MLSE-PSP. The soft symbol values then may be processed to obtain soft bit values for each bit of the multibit symbols. In particular, the soft symbol values may be converted to soft bit values and interleaved to provide soft, coded bit values. Error correction decoding then may be applied to the soft, coded bit values to provided the decoded bits. 0, Berghager et al., 375/354; US-6002670, 19991200, Rahman et al., 370/238; US-6148010, 20001100, Sutton et al., 370/536; US-6205142, 20010300, Vallee, 370/394 s Amir Hindie and Karl Leinfelder, and entitled "MODEM USING A DIGITAL SIGNAL PROCESSOR AND SEPARATE TRANSMIT AND RECEIVE SEQUENCERS." U.S. patent application Ser. No. 09/160,571, filed Sep. 25, 1998, by inventors Amir Hindle and Karl Leinfelder, and entitled "A MODEM USING BATCH PROCESSING OF SIGNAL SAMPLES." U.S. patent application Ser. No. 09/160,570, filed Sep. 25, 1998, by inventors Amir Hindie and Karl Leinfelder, and entitled "A MODEM WITH CODE EXECUTION ADAPTED TO SYMBOL RATE." U.S. patent application Ser. No. 09/160,569, filed Sep. 25, 1998, by inventors Wesley Smith, Karl Nordling, Amir Hindie, Karl Leinfelder, Sebastian Gracias and Jim Beaney, and entitled "INTEGRATED AUDIO AND MODEM DEVICE." U.S. patent application Ser. No. 09/160,331, filed Sep. 25, 1998, by inventors Sebastian Gracias and Jim Beaney, and entitled "CODE SWAPPING TECHNIQUES FOR A MODEM IMPLEMENTED ON A DIGITAL SIGNAL PROCESSOR." U.S. patent application Ser. No. 09/160,572, filed Sep. 25, 1998, by inventors David Pearce, Wesley Smith, Karl Nordling, Amir Hindie, Karl Leinfelder, Sebastian Gracias and Jim Beaney, and entitled "A MULTI-MODEM IMPLEMENTATION WITH HOST BASED AND DIGITAL SIGNAL PROCESSOR BASED MODEMS." U.S. patent application Ser. No. 09/160,587, filed Sep. 25, 1998, by inventors Guozhu Long and Jim Beaney, and entitled "SYNCHRONIZATION TECHNIQUES USING AN INTERPOLATION FILTER." U.S. patent application Ser. No. 09/160,577, filed Sep. 25, 1998, by inventors (Guozhu Long and Jim Beaney, and entitled "A MODEM WITH A FAST GAIN TRACKER." U.S. patent application Ser. No. 09/160,538, filed Sep. 25, 1998, by inventor Jim Beaney, and entitled "A TONE DETECTOR FOR USE IN A MODEM."