Abstract:
Methods and apparatus for generating and processing wideband signals having reduced discrete power spectral density (PSD) components are disclosed. A wideband signal having reduced discrete PSD components is achieved by generating data symbols responsive to data for transmission, transforming one or more of the data symbols into a frame including one or more orthogonal frequency division multiplexing (OFDM) symbols, selectively inverting the frame responsive to a pseudo-random data sequence, and modulating wideband signal pulses of the wideband signal with the selectively inverted frame.
Abstract:
Methods, systems, and apparatus for use in a communication system utilizing multiple bands to improve transmission error rates are disclosed. Error rates are improved by mapping (204) a portion of an input bit stream within a data stream to s first and second bands of the multiple bands, transmitting (206) the portion of this bit stream in the first and second bands, receiving (208) bit streams in the first and second bands corresponding to the portion of the bit stream, demapping (210) the first and second bands, and processing (212) the first and second band bit streams to yield the original portion of the input bit stream.
Abstract:
A broadcast gateway system for interaction of iDTV and home networks via a broadcast gateway includes a broadcast carousel, an interactive DTV (iDTV) platform, and a home networking (HN) platform. Interaction of the broadcast carousel, the iDTV platform, and the HN platform allows applications, content, and services to be delivered to a home network via a DTV broadcast stream.
Abstract:
Method and computer program products for enhancing wireless communication in a wireless network are disclosed. In the wireless network, frames of data are transmitted in bursts. Wireless communication is enhanced by transmitting a first frame of source data that is scrambled using a scrambling sequence in a first burst, storing an indicator corresponding to the scrambling sequence for the first frame, identifying the scrambling sequence of the first frame for retransmission of the first frame, retransmitting the first frame (which is scrambled using the identified scrambling sequence) in a subsequent burst, receiving the trasmitted and retransmitted first frames, and processing the received transmitted and retransmitted first frames to recover the source data.
Abstract:
Scrambling methods for scrambling ultra wideband (UWB) data are disclosed. UWB data (420) having payload data and non-payload data is scrambled (422, 424) by shifting a first bit string (412) a first number of bits, shifting a second bit string (410) a second number of bits, combining (414A - 414N) the first and second shifted bit strings, generating (418) scrambler control bits (416) from the combined first and second shifted bit strings, and scrambling (424) at least a portion of the UWB data responsive to the scrambler control bits. According to another aspect, UWB data is scrambled by scrambling payload data using a pseudo-random number generator having a seed set of multiple seeds having low seed correlation, each seed within the seed set having a predefined number of bits, and selective applying random frame reversion (428, 430) to non-payload data and/or to entire frame of data.
Abstract:
A broadcast gateway system for interaction of iDTV and home networks via a broadcast gateway includes a broadcast carousel, an interactive DTV (iDTV) platform, and a home networking (HN) platform. Interaction of the broadcast carousel, the iDTV platform, and the HN platform allows applications, content, and services to be delivered to a home network via a DTV broadcast stream.
Abstract:
A control method of synchronizing communications between or among a plurality of devices in a communication system includes detecting beacons from the devices in the communication system and establishing a reservation for at least a portion of the devices in the communication system. Each reservation is a frame interval in which to transmit symbols from one device to other devices in the communications system. Each frame interval and inter-frame interval may be set according to the established reservation. Each frame interval and inter-frame interval may be a plural, integral number of symbol periods in duration. Each device may determine a time-frequency code (TFC) for each of the other devices in the communication system according to the detected beacons from the other devices and may adjust a frequency band for transmission according to the determined TFC to transmit one or more symbols from the respective device using the adjusted frequency band.
Abstract:
Methods, systems, and apparatus for use in a communication system utilizing multiple bands to improve transmission error rates are disclosed. Error rates are improved by mapping (204) a portion of an input bit stream within a data stream to s first and second bands of the multiple bands, transmitting (206) the portion of this bit stream in the first and second bands, receiving (208) bit streams in the first and second bands corresponding to the portion of the bit stream, demapping (210) the first and second bands, and processing (212) the first and second band bit streams to yield the original portion of the input bit stream.
Abstract:
Methods and apparatus for use in a multi-band OFDM wideband transmission systems are disclosed. A frame of source data is mapped by a transmitter for transmission using a first mapping. The frame of source data is then mapped by the transmitter for retransmission using a second mapping to increase frequency diversity. A receiver may identify source data that experiences fading and communicate the tone/frequency on which the fading occurred to the transmitter so that the transmitter may map the source data that experienced fading during transmission to another tone/frequency for retransmission.
Abstract:
Scrambling methods for scrambling ultra wideband (UWB) data are disclosed. UWB data (420) having payload data and non-payload data is scrambled (422, 424) by shifting a first bit string (412) a first number of bits, shifting a second bit string (410) a second number of bits, combining (414A - 414N) the first and second shifted bit strings, generating (418) scrambler control bits (416) from the combined first and second shifted bit strings, and scrambling (424) at least a portion of the UWB data responsive to the scrambler control bits. According to another aspect, UWB data is scrambled by scrambling payload data using a pseudo-random number generator having a seed set of multiple seeds having low seed correlation, each seed within the seed set having a predefined number of bits, and selective applying random frame reversion (428, 430) to non-payload data and/or to entire frame of data.