MBIT WIRELESS, INC.
|MBIT WIRELESS, INC. Patent applications|
|Patent application number||Title||Published|
|20100040156||Dual-pass joint channel estimation and data demodulation for OFDM systems - The present invention provides architectures and methods which implement dual-pass joint channel estimation and data demodulation in communication systems to provide enhanced performance of the communication link. While not limited to any particular communication protocol, such architectures and methods are particularly beneficial in OFDM systems. Channel estimates may be performed using reference symbols and demodulated data symbols according to certain patterns of subcarriers for OFDM symbols. The channel estimates obtained from different patterns may be combined for dual-pass channel estimate which may have reduced estimation error. Such a procedure enables more accurate channel estimation and improved data demodulation, thereby enhancing system performance.||02-18-2010|
|20090077256||Dynamic change of quality of service for enhanced multi-media streaming - The present invention describes a method and apparatus to change the QoS automatically to minimize the initial delay in multimedia streaming. Additional QoS parameters may be used to enable the automatic selection of initial data rate and transition to steady state date rate. The method enhances the user experience with minimum processing overhead.||03-19-2009|
|20090067554||High throughput and low latency map decoder - In digital communication systems forward error correction coding techniques are typically used to improve the bit error rate performance. The receiver of the digital communication systems employs a decoding apparatus which may use Maximum A posteriori Probability (MAP) algorithm and its variations such as Logarithmic-MAP (Log-MAP), Maximum-Logarithmic-MAP (Max-Log-MAP). MAP decoding apparatus is commonly used as a key component in of decoder for error correcting codes such as convolutional codes and turbo codes. The MAP decoding apparatus computes likelihood estimates as the output. The present invention performs faster MAP decoding by computing likelihood estimates in parallel.||03-12-2009|
|20090041166||Method and apparatus to improve information decoding when its characteristics are known a priori - The present invention provides systems and methods for decoding received messages using a priori characteristics of selected message portions. A message which has been encoded in a particular format, such as a tail-biting convolutional coding, is received and decoded by utilizing the a priori information about the message. In one case, static-type receive bits in a portion of the message, such as a Frame Control Header, are used to reduce the number of trellis states at particular stages of the decoding process. A Viterbi-type decoding process may be employed in either a soft or hard decision mode. Reducing the number of trellis states improves the success rate for message decoding and improves receiver throughput. Power consumption may also be reduced.||02-12-2009|
|20090017766||Adaptive use of multiple receive chains in wireless communication terminals - A wireless communication device is adaptively operated in a wireless communication network. The wireless communication device includes a receiver subsystem having a total number of available receive chains R||01-15-2009|
|20090016351||Error resilient protocol data unit boundary detection - The present invention provides systems and methods for boundary detection of protocol data units in a communication system. A protocol entity such as a header check sequence (HCS) validation circuit is used to compute header check sequences of protocol data units in a packet burst. If a given HCS is valid, then the payload of the respective protocol data unit may be used. However, if the given HCS is invalid, then a parallel sliding window is used to compute other possible HCSs to identify a protocol data unit boundary. Once the boundary is located, then the payload may be used. Even if a protocol data unit is invalid or a header is not found, other protocol data units in a packet burst may be used in accordance with aspects of the invention. Such operation reduces the number of retransmissions required due to invalid HCSs.||01-15-2009|
|20080310536||Adaptive joint channel estimation and data demodulation for OFDM systems - The present invention provides architectures and methods which implement adaptive joint channel estimation and data demodulation in wireless communication systems to provide enhanced performance of the communication link. While not limited to any particular air interface, such architectures and methods are particularly beneficial in OFDM systems. Channel estimates may be performed for pilot sub-carriers for a given OFDM symbol and filtering may then be performed for channel estimation of a given data subcarrier. Received symbols may be equalized and demodulated, and the channel estimate may be updated for the given data subcarrier. Such a procedure enables more accurate channel estimation and improved data demodulation, thereby enhancing system performance.||12-18-2008|
|20080287082||Method and apparatus to improve network acquisition - The present invention provides architectures and methods which use multiple radio receive chains in mobile devices to provide enhanced performance, such as when acquiring and maintaining network access. A plurality of receive chains simultaneously perform signal level measurements across one or more measurement cycles. The number of RF channels upon which measurements are performed may be determined adaptively/dynamically. One or more criterion may be used to set signal level thresholds. If a measured signal for a given channel fails to satisfy a threshold, then that RF channel may be removed from the network acquisition process. If a measured signal for a channel exceeds another threshold, then that channel may be employed in further network acquisition processes, such as identifying potential beacon signal channels, verifying beacon signal channels and synchronizing the device to one of the beacon channels.||11-20-2008|
|20080273634||Parallel preamble search architectures and methods - The present invention provides architectures and methods which enables faster and more power efficient detection of channel parameters used by a communication system. Various parallel preamble correlator structures are able to perform searches for multiple preambles in parallel. The received samples are correlated with different delays between the samples corresponding to the different possible channel parameters that may be used by the communication system. Processing elements used in the preamble search may be shared among the parallel preamble search sections of a given architecture to reduce costs and power consumption. Decimation and filtering may also be used to reduce the interference from adjacent channels.||11-06-2008|
|20080220807||Multiple radio receive chain wireless communication devices - The present invention provides architectures and methods which use multiple radio receive chains in mobile devices to boost performance of the mobile devices. While a first set of the receive chains are assigned to a serving base station, another set of receive chains are dynamically allocated to neighbor base stations and/or to the serving base station depending upon present or expected system conditions and timing. A first synthesizer is configured to provide signals to the first and second set of receive chains. Other synthesizers are also configured to provide signals to the second set of receive chains. Thus, depending on the mode of operation, the second set of receive chains utilizes signals from a given synthesizer as needed. A priori data may be used to allocate specific receive chains to the serving base station, neighboring base stations or both. Unused synthesizers may be turned off to conserve power.||09-11-2008|
Patent applications by MBIT WIRELESS, INC.