Abstract: A method includes, in a transceiver (24), receiving from a repeater (32) a received signal, which includes a desired signal for reception and an undesired replica of a transmitted signal that was transmitted from the transceiver and retransmitted by the repeater. A local copy of the transmitted signal is generated in the transceiver. A filter response that, when applied to the transmitted signal before transmission, compensates for a difference in spectral response between the local copy and the undesired replica, is estimated in the transceiver. The undesired replica of the transmitted signal, which is received in the received signal, is matched with the local copy of the transmitted signal, by at least pre-filtering the transmitted signal before transmission with the estimated filter response. Interference caused by the undesired replica to the desired signal is canceled, by combining the local copy and the received signal.

Abstract: A method includes, in a transceiver (28, 160), receiving from a repeater (32, 168) a received signal that includes a desired signal for reception and an undesired replica of a transmitted signal that was transmitted from the transceiver and retransmitted by the repeater. A local copy of the transmitted signal is generated in the transceiver. The local copy is matched with the undesired replica of the transmitted signal in the received signal, by adapting the received signal while retaining the local copy non-adaptive. An interference caused by the undesired replica to the desired signal is canceled, by subtracting the local copy from the adapted received signal.

Abstract: A method includes receiving a signal, which carries data that is encoded with an Error Correction Code (ECC), and correcting the received signal with an adaptive receiver loop. Soft input metrics for the data are computed over the corrected signal. The ECC is decoded using a decoder, which estimates soft output metrics based on the soft input metrics, by operating the decoder in an alternating pattern of external iterations that update one or more of the soft input metrics based on one or more of the soft output metrics, and internal iterations that update the soft output metrics but not the soft input metrics. The adaptive receiver loop is adjusted in a schedule that is defined relative to the pattern of the external and the internal iterations of the decoder.

Abstract: A method includes accepting modulated symbols, which carry bits of a code word of a Low Density Parity Check (LDPC) code, and computing respective soft input metrics for the bits. The code word is decoded using an iterative LDPC decoding process that includes selecting, based on a predefined criterion, a number of internal iterations to be performed by an LDPC decoder (84) in the process, performing the selected number of the internal iterations using the LDPC decoder so as to estimate decoded bits and soft output metrics indicative of the input bits based on the soft input metrics, performing an external iteration that updates one or more of the soft input metrics based on one or more of the soft output metrics produced by the LDPC decoder, and repeating at least one of the internal iterations using the updated soft input metrics.

Abstract: A method includes, in a transceiver (28, 160), receiving from a repeater (32, 168) a received signal that includes a desired signal for reception and an undesired replica of a transmitted signal that was transmitted from the transceiver and retransmitted by the repeater. A local copy of the transmitted signal is generated in the transceiver. The local copy is matched with the undesired replica of the transmitted signal in the received signal, by adapting the received signal while retaining the local copy non-adaptive. An interference caused by the undesired replica to the desired signal is canceled, by subtracting the local copy from the adapted received signal.

Abstract: A method includes receiving a signal, which carries data in a sequence of symbols that are modulated in accordance with a pulse shape and transmitted in accordance with a timing clock. The received signal is filtered with a matched filter whose response is matched to the pulse shape of the symbols, to produce a filtered signal. The timing clock is initially recovered from the received signal prior to filtering with the matched filter. Upon meeting a predefined condition, a switch is made to recover the timing clock from the filtered signal after filtering with the matched filter. The symbols are demodulated using the recovered timing clock, so as to reconstruct the data.

Abstract: A communication method includes operating a communication unit (60, 124), which demodulates radio signals in accordance with a first air interface and applies at least one upper-layer process to the demodulated signals. A signal is received and demodulated in accordance with a second air interface, different from the first air interface. The demodulated signal is input to the communication unit so as to cause the communication unit to apply the upper-layer process to the signal that was demodulated using the second air interface, while superseding the first air interface.

Abstract: A method includes receiving a signal, which carries data in a sequence of symbols that are modulated in accordance with a pulse shape and transmitted in accordance with a timing clock. The received signal is filtered with a matched filter whose response is matched to the pulse shape of the symbols, to produce a filtered signal. The timing clock is initially recovered from the received signal prior to filtering with the matched filter. Upon meeting a predefined condition, a switch is made to recover the timing clock from the filtered signal after filtering with the matched filter. The symbols are demodulated using the recovered timing clock, so as to reconstruct the data.

Abstract: A method includes receiving a signal, which carries data that is encoded with an Error Correction Code (ECC), and correcting the received signal with an adaptive receiver loop. Soft input metrics for the data are computed over the corrected signal. The ECC is decoded using a decoder, which estimates soft output metrics based on the soft input metrics, by operating the decoder in an alternating pattern of external iterations that update one or more of the soft input metrics based on one or more of the soft output metrics, and internal iterations that update the soft output metrics but not the soft input metrics. The adaptive receiver loop is adjusted in a schedule that is defined relative to the pattern of the external and the internal iterations of the decoder.

Abstract: A method for communication includes receiving a Radio Frequency (RF) channel containing a desired signal conforming to a first air interface and an interfering signal conforming to a second air interface. A first receiver configured for the first air interface and a second receiver configured for the second air interface are synchronized to a common frequency and timing reference. While the first and second receivers are synchronized, the desired signal is decoded from the RF channel using the first receiver to generate a first output, the interfering signal is decoded from the RF channel using the second receiver to generate a second output, and the desired signal is reconstructed while suppressing the interfering signal by jointly processing the first and second outputs.

Abstract: A method for communication includes modulating data to produce a series of symbols defined in a signal space. The symbols are pulse-shaped using a given pulse shape. A signal, which includes a sequence of the pulse-shaped symbols (104A . . . 104C) transmitted at a symbol rate that is higher than a Nyquist rate defined for the given pulse shape, is transmitted to a receiver (40). Prior to pulse-shaping the symbols, Inter-Symbol Interference (ISI) in the signal is pre-compensated for by applying a lattice precoding operation to the symbols. The lattice precoding operation confines the symbols to a predefined volume (110) in the signal space and is computed independently of any feedback from the receiver.

Abstract: A method for communication includes receiving a Radio Frequency (RF) channel containing a desired signal conforming to a first air interface and an interfering signal conforming to a second air interface. A first receiver configured for the first air interface and a second receiver configured for the second air interface are synchronized to a common frequency and timing reference. While the first and second receivers are synchronized, the desired signal is decoded from the RF channel using the first receiver to generate a first output, the interfering signal is decoded from the RF channel using the second receiver to generate a second output, and the desired signal is reconstructed while suppressing the interfering signal by jointly processing the first and second outputs.

Abstract: A method includes accepting modulated symbols, which carry bits of a code word of a Low Density Parity Check (LDPC) code, and computing respective soft input metrics for the bits. The code word is decoded using an iterative LDPC decoding process that includes selecting, based on a predefined criterion, a number of internal iterations to be performed by an LDPC decoder (84) in the process, performing the selected number of the internal iterations using the LDPC decoder so as to estimate decoded bits and soft output metrics indicative of the input bits based on the soft input metrics, performing an external iteration that updates one or more of the soft input metrics based on one or more of the soft output metrics produced by the LDPC decoder, and repeating at least one of the internal iterations using the updated soft input metrics.

Abstract: A communication method includes operating a communication unit (60, 124), which demodulates radio signals in accordance with a first air interface and applies at least one upper-layer process to the demodulated signals. A signal is received and demodulated in accordance with a second air interface, different from the first air interface. The demodulated signal is input to the communication unit so as to cause the communication unit to apply the upper-layer process to the signal that was demodulated using the second air interface, while superseding the first air interface.

Abstract: A method for communication includes modulating data to produce a series of symbols defined in a signal space. The symbols are pulse-shaped using a given pulse shape. A signal, which includes a sequence of the pulse-shaped symbols (104A . . . 104C) transmitted at a symbol rate that is higher than a Nyquist rate defined for the given pulse shape, is transmitted to a receiver (40). Prior to pulse-shaping the symbols, Inter-Symbol Interference (ISI) in the signal is pre-compensated for by applying a lattice precoding operation to the symbols. The lattice precoding operation confines the symbols to a predefined volume (110) in the signal space and is computed independently of any feedback from the receiver.