摘要:
A communication system capable of achieving a high usage efficiency of frequencies without the need for cooperation of multiplexed users is disclosed. The communication system communicates over frequency channels set by dividing a frequency bandwidth assigned to the system and allows interference between channels by overlapping the adjacent frequency channels with each other in the frequency domain. A transmitting and receiving device, which transmits and receives a signal by allowing the interference between symbols at a waveform level for each channel to decrease the occupied bandwidth, is provided. The receiving device is provided with an Inter-Channel Interference (ICI) removal and Inter-Symbol Interference (ISI) compensation filter serving as either an ICI removal filter for removing the interference between channels or an ISI compensation filter for compensating the interference between symbols.
摘要:
There is provided a communication system capable of achieving a high usage efficiency of frequencies without the need for cooperation of multiplexed users. A communication system communicates over frequency channels set by dividing a frequency bandwidth assigned to the system allows interference between channels by overlapping the adjacent frequency channels with each other in the frequency domain, or a transmitting and receiving device, which transmits and receives a signal by allowing the interference between symbols at a waveform level for each channel to decrease the occupied bandwidth, is provided with ICI removal and ISI compensation filter 111 serving as either an ICI removal filter for removing the interference between channels or an ISI compensation filter for compensating the interference between symbols.
摘要:
A communication apparatus used in a spectrum sharing environment in which multiple communication systems coexist using the same spectrum band is provided. The apparatus includes a transmission pulse shaper that performs bandwidth limitation on a pulse which is used to send data symbols; a monitoring unit that monitors in-band interference conditions from coexisting systems other than a target system to which the communication apparatus belongs, and availability of unused spectrum on adjacent channels of the target system; a controller that controls a pulse transmission period and a pulse width of the transmission pulse shaper based on the monitoring result; and a transmission unit that transmits the band-limited signal.
摘要:
In the communication system, a transmission signal based on the first radio access scheme is generated, and in the communication system a transmission signal based on the second radio access scheme different from the first radio access scheme is generated. A usage status of the frequency spectrum of the transmission signal based on the first radio access scheme, as well as the known parameters of the transmission signal based on the second radio access scheme, are determined by the pulse-shaping controller. Then, the pulse-shaping controller performs control so as to pulse-shape the transmission signal based on the first radio access scheme by means of the transmit filter on the basis of the result of the above determination, or performs control so as to pulse-shape the transmission signal based on the second radio access scheme by means of the transmit filter on the basis of the result of the above determination.
摘要:
A wireless transmitter comprises ID signal storage module for storing an ID signal that identifies a group to which a data signal to be transmitted belongs and provides, for each group, second or higher-order statistic properties unique to each group; modulator for modulating the data signal; wireless signal ID assignment module for associating the modulated signal thus modulated with the stored ID signal and for generating a signal to be transmitted, by assigning second or higher-order statistic properties that correspond with the ID signal to the modulated signal that is associated with the ID signal; and wireless signal transmission module for wirelessly transmitting the signal thus generated.
摘要:
A communication device used in a first communication system under a frequency sharing environment where the first communication system and a second communication system establish communications within the same frequency band is disclosed. The communication device comprises a detector for detecting an interfering signal from the second communication system; and a determiner for determining transfer characteristics of a shaping filter according to a result of the detection, the shaping filter being used for a desired signal of the first communication system.
摘要:
A communication apparatus used in a spectrum sharing environment in which multiple communication systems coexist using the same spectrum band is provided. The apparatus includes a transmission pulse shaper that performs bandwidth limitation on a pulse which is used to send data symbols; a monitoring unit that monitors in-band interference conditions from coexisting systems other than a target system to which the communication apparatus belongs, and availability of unused spectrum on adjacent channels of the target system; a controller that controls a pulse transmission period and a pulse width of the transmission pulse shaper based on the monitoring result; and a transmission unit that transmits the band-limited signal.
摘要:
A communication device used in a first communication system under a frequency sharing environment where the first communication system and a second communication system establish communications within the same frequency band is disclosed. The communication device comprises a detector for detecting an interfering signal from the second communication system; and a determiner for determining transfer characteristics of a shaping filter according to a result of the detection, the shaping filter being used for a desired signal of the first communication system.
摘要:
A wireless transmitter comprises ID signal storage module for storing an ID signal that identifies a group to which a data signal to be transmitted belongs and provides, for each group, second or higher-order statistic properties unique to each group; modulator for modulating the data signal; wireless signal ID assignment module for associating the modulated signal thus modulated with the stored ID signal and for generating a signal to be transmitted, by assigning second or higher-order statistic properties that correspond with the ID signal to the modulated signal that is associated with the ID signal; and wireless signal transmission module for wirelessly transmitting the signal thus generated.
摘要:
In the communication system, a transmission signal based on the first radio access scheme is generated, and in the communication system a transmission signal based on the second radio access scheme different from the first radio access scheme is generated. A usage status of the frequency spectrum of the transmission signal based on the first radio access scheme, as well as the known parameters of the transmission signal based on the second radio access scheme, are determined by the pulse-shaping controller. Then, the pulse-shaping controller performs control so as to pulse-shape the transmission signal based on the first radio access scheme by means of the transmit filter on the basis of the result of the above determination, or performs control so as to pulse-shape the transmission signal based on the second radio access scheme by means of the transmit filter on the basis of the result of the above determination.