Abstract: A mobile device that operates in a wireless communication network is disclosed. The mobile device includes a transceiver that uses a first wireless communication technology, which can be Long Term Evolution (LTE) technology. The mobile device also includes a modem that coupled to the transceiver through a standard interface and uses a second wireless communication technology, which can be CDMA. The modem processes the received signal from the transceiver and processes a transmit signal for the transceiver. A first receiver first processing circuit has a matching filter to compensate for and resampling the received signal from the receiver so that that the received signal from the transceiver is compatible with the modem. A transmitter processing has a filter for resampling and adjusting a processed transmit signal for the transmitter.

Abstract: A method and apparatus mitigates spurious transmissions. An offset local oscillator signal is generated that is at a frequency that is offset from a nominal transmit channel carrier frequency by a spurious mitigation offset. An information signal is generated that comprises a series of modulation symbols and has a transmission bandwidth at baseband. A configured offset information signal is generated from the information signal, wherein the spectrum of the configured offset information signal is offset from DC by a channel configuration offset, and is further offset by a negative of the spurious mitigation offset. The offset local oscillator signal and the configured offset information signal are combined using a mixing technique. The spurious mitigation offset is zero when a spurious condition does not exist and is non-zero when the spurious condition does exist.

Abstract: A mobile device that operates in a wireless communication network is disclosed. The mobile device includes a transceiver that uses a first wireless communication technology, which can be Long Term Evolution (LTE) technology. The mobile device also includes a modem that coupled to the transceiver through a standard interface and uses a second wireless communication technology, which can be CDMA. The modem processes the received signal from the transceiver and processes a transmit signal for the transceiver. A first receiver first processing circuit has a matching filter to compensate for and resampling the received signal from the receiver so that that the received signal from the transceiver is compatible with the modem. A transmitter processing has a filter for resampling and adjusting a processed transmit signal for the transmitter.

Abstract: A method and apparatus mitigates spurious transmissions. An offset local oscillator signal is generated that is at a frequency that is offset from a nominal transmit channel carrier frequency by a spurious mitigation offset. An information signal is generated that comprises a series of modulation symbols and has a transmission bandwidth at baseband. A configured offset information signal is generated from the information signal, wherein the spectrum of the configured offset information signal is offset from DC by a channel configuration offset, and is further offset by a negative of the spurious mitigation offset. The offset local oscillator signal and the configured offset information signal are combined using a mixing technique. The spurious mitigation offset is zero when a spurious condition does not exist and is non-zero when the spurious condition does exist.

Abstract: A method for maintaining timing across discontinuous activity gaps for a non-real time data interface, in a radio frequency (RF) IC is disclosed. The method comprises starting a first receive mode in the RF IC to receive analog RF signals 210 in response to receiving a first command from a base band (BB) IC, converting the analog RF signals 215 into a first stream of digital data samples, and transmitting 225 the samples to the BB IC. Next, the RF IC stops the first receive mode 235 in response to receiving a second command from the BB IC and transmits 245 dummy data samples to the BB IC. Then the RF IC re-starts the first receive mode 275 in response to receiving a third command from the BB IC 270, converts analog RF signals received by the first receive mode into a second stream of digital data samples 285, and transmits the samples to the BB IC 298.

Abstract: A method and apparatus for synchronizing a system clock with a serving cell (102) associated with a first radio access technology and monitoring an adjacent cell (104) associated with a second radio access technology is provided. A communication device (100) includes a first synchronization device (205) capable of synchronization with the serving cell (102) and a second synchronization device (206) capable of independently synchronizing with the adjacent cell (104). The first synchronization device (205) and second synchronization device (206) include independent frequency correction modules (207,208). Thus, the second frequency synchronization device (206) may be corrected per the adjacent cell (104) while the first synchronization device (205) remains synchronized with the serving cell (102). Thus, the same corrected system clock may be used between two radio access technologies.

Abstract: A multimode wireless communication device capable of communicating pursuant to first and second communication protocols, including a method wherein a determination is made (530) as to whether a harmonic generated during transmission in one protocol interferes with reception in another protocol, and wherein transmission is suspended while receiving only if a harmonic generated during transmission interferes with reception. In some embodiments, the transmitter is temporarily operated in compressed mode to enable the suspension.

Abstract: A multi-receiver wireless communication device includes a transmitter, a transmit oscillator communicatively coupled to the transmitter, a receive oscillator communicatively coupled to a first receiver and second receiver, and a switching assembly having a first state in which the receive oscillator is coupled to the first and second receivers and a second state in which the receive oscillator is de-coupled from the second receiver and the transmit oscillator is coupled to the second receiver. The first receiver and the second receiver of the wireless communication device are able to operate independent of one another when the switching assembly is in the second state.

Abstract: A method and apparatus for detecting a frequency band and mode of operation using recursive sampling and narrowing down is disclosed. The method comprises sampling (215) by a multi-mode wireless communication device, a broad operational frequency spectrum at a first sampling rate to produce a first set of discrete signal samples. Then, the wireless communication device compares (230, 240) at least one of the energy graphs of the first set of discrete signal samples with at least one protocol-specific signature to confirm (245), if an approximate match is found. When one or more approximate matches are found, the wireless communication device narrows down (250) the broad frequency spectrum to a reduced set of frequency band(s) that correspond to the matched protocol-specific signature(s). Then the steps of sampling (215), comparing (230, 240), confirming (245), and narrowing down (250) are recursively followed till a frequency band and mode of operation is confirmed.

Abstract: A method for maintaining timing across discontinuous activity gaps for a non-real time data interface, in a radio frequency (RF) IC is disclosed. The method comprises starting a first receive mode in the RF IC to receive analog RF signals 210 in response to receiving a first command from a base band (BB) IC, converting the analog RF signals 215 into a first stream of digital data samples, and transmitting 225 the samples to the BB IC. Next, the RF IC stops the first receive mode 235 in response to receiving a second command from the BB IC and transmits 245 dummy data samples to the BB IC. Then the RF IC re-starts the first receive mode 275 in response to receiving a third command from the BB IC 270, converts analog RF signals received by the first receive mode into a second stream of digital data samples 285, and transmits the samples to the BB IC 298.

Abstract: A method and apparatus for synchronizing a system clock with a serving cell (102) associated with a first radio access technology and monitoring an adjacent cell (104) associated with a second radio access technology is provided. A communication device (100) includes a first synchronization device (205) capable of synchronization with the serving cell (102) and a second synchronization device (206) capable of independently synchronizing with the adjacent cell (104). The first synchronization device (205) and second synchronization device (206) include independent frequency correction modules (207,208). Thus, the second frequency synchronization device (206) may be corrected per the adjacent cell (104) while the first synchronization device (205) remains synchronized with the serving cell (102). Thus, the same corrected system clock may be used between two radio access technologies.

Abstract: A multi-receiver wireless communication device includes a transmitter, a transmit oscillator communicatively coupled to the transmitter, a receive oscillator communicatively coupled to a first receiver and second receiver, and a switching assembly having a first state in which the receive oscillator is coupled to the first and second receivers and a second state in which the receive oscillator is de-coupled from the second receiver and the transmit oscillator is coupled to the second receiver. The first receiver and the second receiver of the wireless communication device are able to operate independent of one another when the switching assembly is in the second state.

Abstract: A method and apparatus for detecting a frequency band and mode of operation using recursive sampling and narrowing down is disclosed. The method comprises sampling (215) by a multi-mode wireless communication device, a broad operational frequency spectrum at a first sampling rate to produce a first set of discrete signal samples. Then, the wireless communication device compares (230, 240) at least one of the energy graphs of the first set of discrete signal samples with at least one protocol-specific signature to confirm (245), if an approximate match is found. When one or more approximate matches are found, the wireless communication device narrows down (250) the broad frequency spectrum to a reduced set of frequency band(s) that correspond to the matched protocol-specific signature(s). Then the steps of sampling (215), comparing (230, 240), confirming (245), and narrowing down (250) are recursively followed till a frequency band and mode of operation is confirmed.