Abstract: The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas is formed, and multiple second data streams are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving of multiple respective ones of said second data streams is individually performed. During successive transmission intervals, the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols.

Abstract: The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas is formed, and multiple second data streams are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving of multiple respective ones of said second data streams is individually performed. During successive transmission intervals, the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols.

Abstract: A system, apparatus and method are described for recording, processing, measuring and transmitting electrical data relating to audible signals originating from within a human body. Acoustic signals originating from a human body are detected by a hand-held device that converts these acoustic signals into corresponding electrical signals. Within the housing of this hand-held device, these signals are processed in the electrical domain, such as filtering, amplifying, storing and analyzing, so that they may be provided in a preferred output format. In certain embodiments of the invention, a speaker on the device housing outputs audible signals relating to the detected inner-body acoustic signals. In other embodiments, a port is provided that outputs electrical signals which may be transmitted over a connection to a distant remote device or stored on a computing device external to the hand-held device.