Abstract: The invention relates to a method for synchronizing a mobile station to a base station, comprising in the base station a act of generating an information about a frequency of a channel which is used to transmit data about the identity of the base station and a act of transmitting the information from the base station to the mobile station.

Abstract: Embodiments of the invention relate generally to radio communication devices and to a method for controlling frequency selection. In an embodiment of the invention, a radio communication device is provided. The radio communication device may include a first medium access control unit, a second medium access control unit, a common scheduling unit configured to control the first medium access control unit and the second medium access control unit, and a communication interface configured for frequency selection communication between the first medium access control unit and the second medium access control unit, wherein at least one frequency channel to be used is exchanged between the first medium access control unit and the second medium access control unit.

Abstract: Embodiments of the invention relate generally to radio communication devices and to a method for controlling frequency selection. In an embodiment of the invention, a radio communication device is provided. The radio communication device may include a first medium access control unit, a second medium access control unit, a common scheduling unit configured to control the first medium access control unit and the second medium access control unit, and a communication interface configured for frequency selection communication between the first medium access control unit and the second medium access control unit, wherein at least one frequency channel to be used is exchanged between the first medium access control unit and the second medium access control unit.

Abstract: A radio communication device and a method for controlling frequency selection. In an embodiment of the invention, a radio communication device may include a first radio modem circuit, a first medium access control circuit assigned to the first radio modem circuit, a second radio modem circuit, a second medium access control circuit assigned to the second radio modem circuit, and a control interface circuit configured to control the first medium access control circuit and the second medium access control circuit.

Abstract: A base station for wireless communication comprises a receiver and a processor. The receiver has a first operating state and a second operating state with different power consumption levels. In the first operating state, the receiver is configured to receive a signal. The processor is coupled to the receiver to switch the receiver between the first and second operating states.

Abstract: Allocation of a plurality of channels in a wireless network is described. The allocation process has each base station serving the sectors in the network scan each unused channel of the plurality of channels in its served sector. The signal quality of each scanned, unused channel is measured and sorted according to the measured signal quality. The quality-sorted unused channels are then ordered according to a statistical algorithm. An ordered list of available channels is generated according to results of the statistical algorithm ordering. This ordered list is broadcast to each access terminal (AT) registered with the base station. New communication between the base station and its registered ATs is then initiated using one of the unused channels in the ordered list.

Abstract: The invention relates to a method for synchronizing a mobile station to a base station, comprising in the base station a act of generating an information about a frequency of a channel which is used to transmit data about the identity of the base station and a act of transmitting the information from the base station to the mobile station.

Abstract: Method and apparatuses are provided for frame-based voice data transmission. In one exemplary embodiment, synchronization information is transmitted in only some of the transmitted frames in an operating mode without payload data transmission.

Abstract: A base station for wireless communication comprises a receiver and a processor. The receiver has a first operating state and a second operating state with different power consumption levels. In the first operating state, the receiver is configured to receive a signal. The processor is coupled to the receiver to switch the receiver between the first and second operating states.

Abstract: Allocation of a plurality of channels in a wireless network is described. The allocation process has each base station serving the sectors in the network scan each unused channel of the plurality of channels in its served sector. The signal quality of each scanned, unused channel is measured and sorted according to the measured signal quality. The quality-sorted unused channels are then ordered according to a statistical algorithm. An ordered list of available channels is generated according to results of the statistical algorithm ordering. This ordered list is broadcast to each access terminal (AT) registered with the base station. New communication between the base station and its registered ATs is then initiated using one of the unused channels in the ordered list.

Abstract: Embodiments related to recording and retrieving of voice data signals are described and depicted.

Abstract: A radio communication device and a method for controlling frequency selection. In an embodiment of the invention, a radio communication device may include a first radio modem circuit, a first medium access control circuit assigned to the first radio modem circuit, a second radio modem circuit, a second medium access control circuit assigned to the second radio modem circuit, and a control interface circuit configured to control the first medium access control circuit and the second medium access control circuit.

Abstract: A full duplex speaker-phone that performs adaptive filtering to provide increased loop stability between users of the speaker-phone. The invention employs a sliding filter that performs adaptive frequency dependent attenuation of the speech signals within a speaker-phone. By detecting the mode of operation of the speaker-phone in real time, the speaker-phone performs adaptive filtering to ensure a high perceptual quality for the users of the speaker-phone. The sliding filtering is performed using a sliding low pass filter (LPF) in certain embodiments of the invention. Perceptually, the speaker-phone does not surrender the appearance of a full duplex speaker-phone from the perspective of the users. In addition, by performing frequency dependent filtering of the speech signals, the speaker-phone offers improved stability in the speaker-phone loop and reduces residual echoes significantly over conventional technology employed in speaker-phones.

Abstract: A speaker-phone that is operable to perform system change detection, double-talk detection and if desired, optimal step-size control. The invention differentiates between system change and double-talk and is operable to these two situations differently. The invention does not rely solely on the energy measurements that are employed by conventional speaker-phones. Highly reliable system change detection is offered when compared to conventional speaker-phones. The direction and the amplitude of the system change is measured with very good detection probability in the invention. For double-talk detection, the invention does not rely on assumptions that the far-end echoes are of lower amplitude that the near-end signal in performing double-talk detection. The invention performs double-talk detection within a large diversity of echo-paths and background noise levels. A designer may tune the speaker-phone system to ensure proper double-talk detection near low levels of the near-end signal.

Abstract: A tone predictor may be employed in a modem system to cancel periodic interference components present in a received signal. The tone predictor may be implemented in a receiver arrangement to cancel such periodic interference and to condition a decision error signal utilized to update the adaptive equalizers. The tone predictor may also be implemented in an echo canceler arrangement to cancel such periodic interference and to condition the error signal used to update the echo canceler filter. The tone predictor includes a delay element, configured to decouple the periodic interference component from other noise components, and an adaptive filter structure configured to generate a periodic interference estimate.

Abstract: A preferred timing recovery scheme is particularly suitable for a high speed digital data communication system that employs T-spaced equalization in the receiving device, where echo cancellation occurs after equalization. The timing recovery technique is based upon an analysis of the impulse response of the equalizer structure (e.g., a structure having a feedforward equalizer and a decision feedback equalizer). The filter tap coefficients of the equalizer elements are analyzed and the sampling phase is adjusted such that a cost function associated with the performance of the equalizer structure is substantially optimized. The sampling phase of the receiver is adjusted in response to a control signal generated as a result of the timing recovery techniques.

Abstract: A pulse code modulation (PCM) modem system employs a relatively white training signal to optimize the adaptive filter coefficients in the receiver equalizers. During the training mode, any line coding or equivalent spectral shaping is disabled to provide a training signal sequence having a substantially even spectral content. The presence of DC within the training signal reduces the likelihood that the error function of the equalizers will settle at a local minimum. Following the training interval, the encoder enables the line coder to condition the digital input sequences, introduce DC nulls, and reduce the detrimental effects of baseline wander.

Abstract: A pulse code modulation (PCM) modem system employs a relatively white training signal to optimize the adaptive filter coefficients in the receiver equalizers. During the training mode, any line coding or equivalent spectral shaping is disabled to provide a training signal sequence having a substantially even spectral content. The presence of DC within the training signal reduces the likelihood that the error function of the equalizers will settle at a local minimum. Following the training interval, the encoder enables the line coder to condition the digital input sequences, introduce DC nulls, and reduce the detrimental effects of baseline wander.

Abstract: A pulse code modulation (PCM) modem system employs a relatively white training signal to optimize the adaptive filter coefficients in the receiver equalizers. During the training mode, any line coding or equivalent spectral shaping is disabled to provide a training signal sequence having a substantially even spectral content. The presence of DC within the training signal reduces the likelihood that the error function of the equalizers will settle at a local minimum. Following the training interval, the encoder enables the line coder to condition the digital input sequences, introduce DC nulls, and reduce the detrimental effects of baseline wander.