Abstract: An optical medium, such as fiber, is tapped to provide an antenna port wherever radio service coverage is desired. Each antenna port is a bi-directional remote unit that receives a digital optical signal from a host unit and transforms the signal to a radio frequency signal for transmission by the remote unit. The remote unit receives radio frequency signals that are converted to digital signals and summed with signals from other remote units and converted to an optical signal for transmission to the host unit.

Abstract: Methods and systems for reconfiguring communications systems are provided. In one embodiment, a radio head interface for a communications system comprises: a first interface for communicating with a signal processing module digitally performing waveform processing to modulate and demodulate radio signals; a second interface for communicating with a radio head for transmitting and receiving wireless radio signals; a first buffer coupled to the first interface for receiving a page of data from the signal processing module, the page of data comprising a page header for communicating reconfiguration parameters and a plurality of digital radio frequency samples representing a modulated radio signal; at least one digital frequency converter coupled to the second interface; and a configuration management unit, the configuration management unit adapted to receive the reconfiguration parameters from the page header and reconfigure the at least one digital frequency converter based on the reconfiguration parameters.

Abstract: An apparatus for gain control in a communication system is disclosed. The apparatus includes means for receiving at least one aggregate communications signal, the at least one aggregate communications signal comprising a summation of distributed communications signals, means for detecting at least a sample of a signal level of the at least one aggregate communications signal, and means for attenuating the signal level of the at least one aggregate communications signal based on the signal level sample.

Abstract: A portable screw conveyor includes a conveyor boom assembly carrying a conveyor and supported by a portable base having wheels located at each corner of the base which provides support for the conveyor boom assembly. An actuator system preferably with a linear actuator, is provided between the conveyor boom assembly and the portable base to raise and lower one end of the conveyor boom assembly. A conveyor boom assembly preferably carries a flexible screw conveyor.

Abstract: A communications system dynamically reconfigurable for RF bandwidth and modulation protocols is disclosed. A server comprises one or more radio head interface modules and a call processing software module adapted to communicate with each other. The call processing software is adapted to perform modulation and demodulation of voice and data streams using one or more air interface protocols. A radio head unit coupled to the radio head interface module communicates with one or more subscriber units. The radio head interface module receives either air interface protocol configuration information, or RF signal bandwidth allocation information, from the call processing software module for one or more communication channels, the information providing a timing trigger and a protocol or bandwidth for one or more communication channels. The radio head interface module reconfigures itself for one or more communications channels, based on the change instructed by the call processing software.

Abstract: An apparatus for gain control in a communication system is disclosed. The apparatus includes means for receiving at least one aggregate communications signal, the at least one aggregate communications signal comprising a summation of distributed communications signals, means for detecting at least a sample of a signal level of the at least one aggregate communications signal, and means for attenuating the signal level of the at least one aggregate communications signal based on the signal level sample.

Abstract: A frequency hopping communications system is disclosed. A server is adapted to have one or more radio head interface modules and a call processing software module. The call processing software module performs modulation and demodulation of voice and data streams using one or more air interface standards. A radio head unit is coupled to the radio head interface module over one or more transport mediums and communicates with one or more subscriber units using the one or more air interface standards. The one or more radio head interface modules, are adapted to receive frequency channel hopping information, including a channel and a time to hop trigger, from the call processing software module for one or more of a plurality of communication channels.

Abstract: Systems and methods for handling buffer overflows and underflows in a software defined radio are presented. A communications system comprises one or more radio head interface modules and a call processing software module. The radio head interface modules are adapted to communicate with the call processing software module. The call processing software module performs modulation and demodulation of voice and data streams and transmits complex RF data samples to the radio head interface modules. A first radio head interface module is adapted to create zero value data samples when complex RF data samples are not received from the call processing software module at an expected data sample rate. The first radio head interface module is further adapted to count zero value data samples created and discard a number of complex RF data samples based on the number of zero value data samples counted by the first radio head interface module.

Abstract: System and methods for the dynamic readjustment of power are provided. In one embodiment a communications system comprises a base station including one or more radio head interface modules and a signal processing module, the radio head interface modules adapted to communicate with the signal processing module. The signal processing module performs modulation and demodulation of voice and data streams using one or more air interface protocols. The system further comprises a radio head unit coupled to the radio head interface modules over one or more transport mediums. The radio head unit communicates with one or more subscriber units using the air interface protocols. The radio head interface modules receive power level adjustment parameters from the signal processing module for one or more logical channels. The one or more radio head interface modules reconfigure a signal gain of one or more communications channels based on the power level adjustment parameters.

Abstract: Systems for dynamic reallocation of bandwidth and modulation protocols is provided. In one embodiment, a radio head interface module comprises: a transmit buffer adapted to receive a data stream from a signal processing module and store the data stream as a page of data samples having a page header; a transmit engine; a digital upconverter, the transmit engine adapted to transfer the page of data samples from the transmit buffer to the digital upconverter; a configuration management unit adapted to receive reconfiguration information from the signal processing module, the reconfiguration information including at least one of air interface protocol parameters and bandwidth allocation information; and a memory adapted with digital upconverter parameters. The configuration management unit is accesses the memory to lookup associated digital upconverter parameters based on the reconfiguration information.

Abstract: An apparatus for gain control in a communication system is disclosed. The apparatus includes means for receiving at least one aggregate communications signal, the at least one aggregate communications signal comprising a summation of distributed communications signals, means for detecting at least a sample of a signal level of the at least one aggregate communications signal, and means for attenuating the signal level of the at least one aggregate communications signal based on the signal level sample.

Abstract: An apparatus for gain distribution in a system comprising a plurality of distributed antennas and a total system dynamic range is disclosed. The apparatus includes means for sensing a signal level at each of the plurality of distributed antennas, means for comparing at least one of the plurality of signal levels with a dynamic range fair share threshold, and means for attenuating each of the at least one of the compared signal levels that is greater than the dynamic range fair share threshold with a gain factor that is determined in response to a remaining portion of the total system dynamic range after attenuation of other signal levels of the plurality of signal levels.

Abstract: A portable screw conveyor includes a conveyor boom assembly carrying a conveyor and supported by a portable base having wheels located at each corner of the base which provides support for the conveyor boom assembly. An actuator system preferably with a linear actuator, is provided between the conveyor boom assembly and the portable base to raise and lower one end of the conveyor boom assembly. A conveyor boom assembly preferably carries a flexible screw conveyor.

Abstract: The present invention relates to dynamically configured wireless communication systems. In particular, in one embodiment, dynamically configured up and down converters in a communication system is provided. The method comprises receiving a request to change a protocol in a communication channel. Obtaining one or more parameters associated with the change in protocol of the communication channel and applying the parameters to the up and down converters.

Abstract: Methods and systems for reconfiguring communications systems are provided. In one embodiment, a radio head interface for a communications system comprises: a first interface for communicating with a signal processing module digitally performing waveform processing to modulate and demodulate radio signals; a second interface for communicating with a radio head for transmitting and receiving wireless radio signals; a first buffer coupled to the first interface for receiving a page of data from the signal processing module, the page of data comprising a page header for communicating reconfiguration parameters and a plurality of digital radio frequency samples representing a modulated radio signal; at least one digital frequency converter coupled to the second interface; and a configuration management unit, the configuration management unit adapted to receive the reconfiguration parameters from the page header and reconfigure the at least one digital frequency converter based on the reconfiguration parameters.

Abstract: Systems and methods for maintaining data stream synchronization are provided. A system comprises one or more radio head interface modules and a call processing software module each adapted to communicate with each other. The call processing software module performs modulation and demodulation of voice and data streams using one or more air interface standards. The call processing software module communicates a forward data stream to a first radio head interface module. The forward data stream comprises a plurality of data samples representing voice and data streams and a plurality of fixed synchronization words. When the first radio head interface module does not observe the receipt of a first fixed synchronization word of the plurality of fixed synchronization words word from the call processing software module when expected, the first radio head interface module concludes that it has lost synchronization with the call processing software module.

Abstract: Methods and systems for reconfiguring communications systems are provided. A communications system comprises one or more radio head interface modules and a call processing software module. The one or more radio head interface modules are adapted to communicate with the call processing software module. The call processing software module performs modulation and demodulation of voice and data streams using one or more air interface standards. The one or more radio head interface modules receive reconfiguration parameters from the call processing software module for one or more logical channels. The call processing software module and the one or more radio head interface modules communicate one or more pages of data samples to each other, each of the one or more pages of data samples having a page header. Reconfiguration parameters are contained in the page header.

Abstract: System and methods for the dynamic readjustment of power are provided. In one embodiment a communications system comprises a base station including one or more radio head interface modules and a signal processing module, the radio head interface modules adapted to communicate with the signal processing module. The signal processing module performs modulation and demodulation of voice and data streams using one or more air interface protocols. The system further comprises a radio head unit coupled to the radio head interface modules over one or more transport mediums. The radio head unit communicates with one or more subscriber units using the air interface protocols. The radio head interface modules receive power level adjustment parameters from the signal processing module for one or more logical channels. The one or more radio head interface modules reconfigure a signal gain of one or more communications channels based on the power level adjustment parameters.

Abstract: Systems for dynamic reallocation of bandwidth and modulation protocols is provided. In one embodiment, a radio head interface module comprises: a transmit buffer adapted to receive a data stream from a signal processing module and store the data stream as a page of data samples having a page header; a transmit engine; a digital upconverter, the transmit engine adapted to transfer the page of data samples from the transmit buffer to the digital upconverter; a configuration management unit adapted to receive reconfiguration information from the signal processing module, the reconfiguration information including at least one of air interface protocol parameters and bandwidth allocation information; and a memory adapted with digital upconverter parameters. The configuration management unit is accesses the memory to lookup associated digital upconverter parameters based on the reconfiguration information.

Abstract: An optical medium, such as fiber, is tapped to provide an antenna port wherever radio service coverage is desired. Each antenna port is a bi-directional remote unit that receives a digital optical signal from a host unit and transforms the signal to a radio frequency signal for transmission by the remote unit. The remote unit receives radio frequency signals that are converted to digital signals and summed with signals from other remote units and converted to an optical signal for transmission to the host unit.