摘要:
A method of signal processing, or corresponding apparatus, includes providing multiple analog receive signals at respective antennas and selecting one antenna at a time in an iterative manner, to cycle through the antennas and provide a multiplexed analog signal. The multiplexed analog signal is filtered at a filter to pass a predetermined frequency band. The multiplexed analog signal is sampled at a single analog to digital converter to generate a multiplexed digital signal. The multiplexed digital signal is demultiplexed to generate multiple digital signals for digital processing. Sharing a receiver and ADC among multiple antennas results in reduced cost and power. Such cost and power reductions in turn enable larger antenna arrays than are available with prior art techniques, thereby promoting increased throughput and coverage.
摘要:
A control unit 19 switches four antennas 111 to 114 at predetermined time intervals, receives signals from an LTE base station 2 using four receiving antennas 111 to 114, and receives signals from a GSM base station 3 using the four antennas 111 to 114. The control unit 19 determines the reception level in a cell 2c of the LTE base station 2 on the basis of signal strengths detected by a received signal detector 14p when signals are received from the LTE base station 2 using the four antennas 111 to 114. In addition, the control unit 19 determines the reception level in a cell 3c of the GSM base station 3 on the basis of four signal strengths detected by the received signal detector 14p when signals are received from the GSM base station 3 using the four antennas 111 to 114.
摘要:
In an information processing apparatus such as a notebook type personal computer having radio communication functions, for communication units to simultaneously carry out transmission/reception independently of each other without increasing the number of antennas, and for sufficiently utilizing a diversity function in the case of only a portion of the communication units, there are provided antennas, communication units capable of carrying out radio communications through the use of the antennas, respectively, and a switching unit for switching connection states between the antennas and the communication units. When radio communications are simultaneously made through the use of all the communication units, the switching unit establishes connections between the communication units and the antennas while, when radio communication is made through the use of the communication unit, the switching unit connects the antennas, the number of which depends on communication modes of the communication unit, with this communication unit.
摘要:
The invention discloses a method (700) for finding differences in path loss between a plurality of RF paths between a first (120, 130) and a second (120, 130) transceiver in a wireless communications system (100). During defined 5 intervals of time (SACCH1-SACCH4), only one RF path is used to transmit from one of said transceivers to the other of said transceivers, and the receiving transceiver measures the strength of the signal received during at least a number of said intervals, thus making it possible to compare signal strength and thereby path loss between different RF paths, which in turn 10 makes it possible to find imperfections in one or more of said RF paths.
摘要:
A method of determining relative phase data of a signal received at multiple antennas, the signal being a phase-modulated data signal having a plurality of periods of constant frequency, the method comprising: within each period of constant frequency, sampling the signal received by a first one of the multiple antennas and sampling the signal received by at least one different one of the multiple antennas; determining from the received samples a data symbol value represented by the received signal for each of the periods of constant frequency; and using the determined data symbol value information to eliminate phase variations between the samples received by the different antennas within each constant frequency period arising from the modulation of the data signal to generate relative phase data for said different antennas.
摘要:
A terminal apparatus adapted to receive a wireless signal by antenna diversity, wherein provisions are made to reduce the number of receive circuits while also reducing the time required for antenna selection. The a terminal apparatus is adapted to receive a wireless signal by antenna diversity, and includes: a mode-of-use detection unit for detecting the mode of use of the terminal apparatus as set up by a user; a storage unit for storing priority information that predefines an antenna to be selected for use by prioritizing the plurality of antennas according to the mode of use that can be detected by the mode-of-use detection unit; and a comparator for outputting selection control information specifying at least one antenna from among the plurality of antennas by comparing the mode of use detected by the mode-of-use detection unit with the priority information stored in the storage unit.
摘要:
A broadcast receiver for receiving a broadcasting of a prescribed channel transmitted from a broadcasting station by a directivity switching antenna capable of switching directivity to a plurality of preset directions, includes a control unit for controlling the directivity switching antenna to switch a directive direction, a memory for storing channel information showing the prescribed channel and direction information showing the directive direction of the directivity switching antenna, and an instructing unit for allowing a user to instruct the prescribed channel to be set as a receiving channel. When the instructing unit instructs the user to set the prescribed channel as the receiving channel, the control unit stores only the channel information of the prescribed channel in the memory.
摘要:
In an information processing apparatus such as a notebook type personal computer having radio communication functions, for communication units to simultaneously carry out transmission/reception independently of each other without increasing the number of antennas, and for sufficiently utilizing a diversity function in the case of only a portion of the communication units, there are provided antennas, communication units capable of carrying out radio communications through the use of the antennas, respectively, and a switching unit for switching connection states between the antennas and the communication units. When radio communications are simultaneously made through the use of all the communication units, the switching unit establishes connections between the communication units and the antennas while, when radio communication is made through the use of the communication unit, the switching unit connects the antennas, the number of which depends on communication modes of the communication unit, with this communication unit.
摘要:
A system and method for receiving communication signals is provided. According to the method, a plurality of communication signals is received, each communication signal comprising one or more source signals. The plurality of communication signals are multiplexed into a multiplexed signal, which is then converted into a baseband signal. The baseband signal is sampled to produce a digital multiplexed signal comprising a plurality of samples. The samples are interpolated to generate respective interpolated digital signals, which are then subject to a blind signal separation operation to separate each of the source signals.
摘要:
A wireless LAN system has auto gain control with no work load applied to its baseband processing block. When the wireless LAN system gets ready to receive a signal, the gain control circuit switches between the receiving antennas. The gain control circuit sets gain setting value time divisional data according to the level of a received signal to roughly control the gain to be set in the LAN and the gain to be set in two programmable gain amplifiers.