Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.