Method and receiver for dynamically compensating for interference to a frequency division multiplex signal
AssigneeLucent Technologies Inc.
InventorsRobert Louis Cupo, Mohsen Sarraf, Mohammad Hossein Zarrabizadeh, Mojtaba Shariat
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Abstract
A method and a receiver for reducing adjacent-channel interference to a digitally modulated receive signal evaluates error rates of the receive signal associated with different receive bandwidths of the receive signal. The receiver selects a preferential bandwidth among the different bandwidths based on a suitably low error rate associated with the preferential bandwidth. The selection of the different bandwidths is achieved by digital signal processing that weighs desired data bits representing a desired bandwidth differently than rejected data bits representing a rejected bandwidth.
Claims34
A method for reducing interference to a receive signal, the method comprising the steps of:
- evaluating error rates of receive signal bits associated with different receive bandwidths of the receive signal;
- selecting receive data bits associated with a desired bandwidth of the different receive bandwidths based on a suitably low error rate associated with the evaluated receive signal bits, wherein the selecting step comprises weighting desired data bits representing the desired bandwidth differently than rejected data bits representing a rejected bandwidth, where the receive data bits include the desired data bits and the rejected data bits;
- and
- decoding the selected receive data bits associated with the desired bandwidth.
A method for reducing interference to a receive signal, the method comprising the steps of:
- evaluating error rates of receive signal bits associated with different receive bandwidths of the receive signal;
- selecting receive data bits associated with a desired bandwidth of the different receive bandwidths based on a suitably low error rate associated with the evaluated receive signal bits;
- and
- decoding the selected receive data bits associated with the desired bandwidth;
- identifying the receive data bits associated with a rejection bandwidth or the desired bandwidth;
- and
- realizing the desired bandwidth in the digital frequency domain through the identified data bits.
A method for reducing interference to a digitally modulated receive signal, the method comprising the steps of;
- selecting receive data bits associated with at least one corresponding bandwidth of a receive signal;
- measuring error rates associated with the selected receive data bits of the at least one corresponding bandwidth to determine a particular bandwidth that provides a suitable measured error rate;
- assigning weights to the data bits to represent the determined particular bandwidth;
- and
- decoding the receive data bits having the assigned weights.
A method of decoding data bits associated with a receive signal comprising the steps of:
- assigning soft representations associated with corresponding received data bits, each soft representation having a number of levels wherein each level represents a probability of a received data bit representing a particular symbol value;
- identifying interfering soft data bits for puncturing based on a frequency range associated with the interfering soft data bits among the soft representations, the interfering soft data bits potentially or actually corrupted by interference to the receive signal;
- puncturing the identified interfering soft data bits with an equiprobable level amongst possible levels;
- and
- decoding the soft representations to obtain a receive symbol.
A receiver for reducing interference to a receive signal comprising:
- a measurer for evaluating error rates of receive signal bits associated with different receive bandwidths of the receive signal;
- a masking filter for selecting the receive data bits associated with a desired bandwidth of the different receive bandwidths, based on a suitably low error rate associated with the receive signal bits for the desired bandwidth, wherein the masking filter is adapted to weigh desired data bits representing the desired bandwidth differently than rejected data bits representing a rejected bandwidth, where the receive data bits include the desired data bits and the rejected data bits.
A receiver for reducing interference to a receive signal comprising:
- a measurer for evaluating error rates of receive signal bits associated with different receive bandwidths of the receive signal;
- a masking filter for selecting the receive data bits associated with a desired bandwidth of the different receive bandwidths, based on a suitably low error rate associated with the receive signal bits for the desired bandwidth, wherein the masking filter is adapted to discount an initial received logical value of the rejected bits to a neutral logical value to facilitate the reduction of interference upon decoding of the receive data bits.
A receiver system for decoding data bits of a receive signal, the receiver system comprising:
- an assigner for assigning soft representations o received data its, each soft representation having a number of levels wherein each level represents a probability of a received data bit representing a particular symbol value;
- an identifier for identifying interfering soft data bits for puncturing based on a frequency range associated with the interfering soft data bits among the soft data bits, the interfering soft data bits potentially or actually corrupted by interference to the receive signal;
- a masking filter for puncturing the identified interfering soft data bits with an equiprobable level amongst possible levels;
- and
- a decoder for decoding the soft representations to obtain a receive symbol.
Dependencies are inferred from the claim text.