Patent
Subcarrier communication system
David J. Chadwick,Howard H. Ma,Frank J. Mammano,J. Marshall,Vijaykumar M. Patel,Lyle G. Saxton +5 more
TLDR
In this article, a communication system for transmitting data to mobile receivers utilizing a subcarrier within a commercial FM channel of a radio station is described, where the data transmitted is first encoded in encoder (112), utilizing a forward error correction code.Abstract:
A communication system (100) is provided for transmitting data to mobile receivers utilizing a subcarrier within a commercial FM channel of a radio station (55). The data transmitted is first encoded in encoder (112), utilizing a forward error correction code. The sequence of the encoded data is altered in interleaver (116), subdivided into a plurality of subframes, in framing and synchronization circuit (120), which also adds channel state bits to each subframe. The framed data is modulated onto the subcarrier in the differential quadrature phased shift keying modulator (130), the output of which is coupled to the FM modulator (52) of radio station transmitter (50). The transmitted radio frequency signals may be received by a vehicle antenna (12) for coupling to the vehicle's FM receiver (80). The modulated subcarrier is recovered from the FM demodulator (84) of the receiver (80), the modulated subcarrier being demodulated to recover the encoded digital data therefrom. The channel state bits included with the data are extracted from the digital data and utilized to form a data reliability factor for each bit of the encoded data. The data reliability factors thus obtained are associated with each bit of the data in a deinterleaver (360). Deinterleaver (360) provides each data bit in proper sequence, with its associated data reliability factor to a decoder (370). The decoded digital data is provided to a vehicle traffic computer (90) for processing and presentation of traffic information to a user on a display (92).read more
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Patent
Ultrawide-band communication system and method
Larry W. Fullerton,Ivan A. Cowie +1 more
TL;DR: In this paper, an impulse radio communication system using one or more subcarriers to communicate information from a radio transmitter to a receiver is described. But the system is not suitable for the use of a single antenna.
Patent
Full duplex ultrawide-band communication system and method
TL;DR: In this article, an impulse radio transceiver for full duplex ultrawide-band communications is described, where the transceiver consists of an IR transmitter to transmit impulse radio signal pulses, an IR receiver to receive them, and a blanking means for blanking selected pulses of the received or transmitted IR signal pulses.
Patent
Fast locking mechanism for channelized ultrawide-band communications
TL;DR: In this paper, a receiver for acquisition and lock of an impulse radio signal comprising an adjustable time base to output a sliding periodic timing signal having an adjustable repetition rate, and a decode timing modulator to output the decode signal in response to the periodic timing signals is presented.
Patent
System and apparatus for performing broadcast and localcast communications
TL;DR: In this paper, a communication system including mobile communication devices is described, where the mobile devices may be wrist-worn watches such as are in common use today, except that the watches are specially configured to receive data in a "broadcast" mode and transmit and/or receive data (localcast) mode.
Patent
Received signal quality determination methods and systems for convolutionally encoded communication channels
TL;DR: In this article, the received signal quality (bit error rate) estimates for a communication channel are provided by a receiver apparatus which is connected to the communication channel and which includes a convolutional decoder providing an estimate of a transmitted data frame and an associated final decision metric.
References
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Patent
Method and apparatus for digital audio broadcasting and reception
John L. Murphy,Mark J. Rich +1 more
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