Patent
Continuous phase modulation system and method with added orthogonal signals
James A. Norris,John W. Nieto +1 more
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TLDR
In this article, a signal generator generates a coded waveform having a trellis structure, such as a continuous phase modulated signal, and a modulator is operative with the signal generator and adds at least one orthogonal or amplitude modulated waveform to a tree-like structure of the waveform.Abstract:
A system and method of the present invention forms a hybrid encoded signal. A signal generator generates a coded waveform having a trellis structure, such as a continuous phase modulated signal. A modulator is operative with the signal generator and adds at least one orthogonal or amplitude modulated waveform to a trellis structure of the coded waveform to create a non-constant envelope modulated signal that has at least one of increased bandwidth, improved bit error rate, or an increased number of bits encoded into a single symbol.read more
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Patent
System and method for variable forward error correction (fec) protection
John W. Nieto,William N. Furman +1 more
TL;DR: In this paper, a variable forward error correction is added to different portions of the communications data in order to compensate for puncturing of the code rate and repetition rate on different parts of the communication data.
Patent
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John W. Nieto,William N. Furman +1 more
TL;DR: In this article, a frequency modulation circuit frequency modulates the communications symbols wherein a constant envelope orthogonal Walsh modulated communications signal is generated having a plurality of waveforms each forming a separate Walsh communications channel.
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QM-CPM modems with higher order signaling
TL;DR: In this paper, a quadrature-multiplexed continuous phase modulation (QM-CPM) signal is made up of the real parts of two underlying CPM signals whose information content can be recovered from just their real parts.
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System and method for communicating data using constant radius orthogonal walsh modulation
John W. Nieto,William N. Furman +1 more
TL;DR: In this article, a radio device includes a transmitter having a modulator for generating M-PAM communications symbols containing communications data, and a frequency modulation circuit frequency modulates the communications symbols wherein a constant radius orthogonal Walsh modulated communications signal containing the communications data is generated.
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Patent
Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same
David F. Sorrells,Michael J. Bultman,Robert W. Cook,Richard C. Looke,Charley D. Moses,Gregory S. Rawlins,Michael W. Rawlins +6 more
TL;DR: In this paper, the authors described a system for down-converting and up-concussing an EM signal by recursively operating on approximate half cycles (½, 1½, 2½, etc.) of the carrier signal.
Patent
Method of transmitting orthogonal frequency division multiplexing signal and receiver thereof
TL;DR: In this article, an orthogonal frequency division multiplexing signal transmitted from the transmitting end to the receiving end intermittently includes a particular symbol S0 having a predetermined particular pattern in addition to a symbol Sm including data to be transmitted.
Patent
Secure wireless LAN device including tamper resistant feature and associated method
TL;DR: In this paper, a secure wireless LAN device includes a housing, a wireless transceiver carried by the housing, and a cryptography circuit carried by a transceiver, which may operate using cryptography information and may also render unuseable the cryptography information based upon tampering.
Proceedings ArticleDOI
Turbo coded continuous phase modulation
A.Z. Yilmaz,Wayne E. Stark +1 more
TL;DR: The concatenation of a turbo encoder and a CPM modulator which can be decoded and demodulated iteratively and multiple iterations of this turbo-decoder/CPM demodulator operation enhances the performance of the system.
Patent
Symbol synchronization in a continuous phase modulation communications receiver
TL;DR: In this paper, an arctangent function of a digital sample of the output of a quadrature demodulator is calculated to synchronize the symbol phase in a continuous phase modulation receiver, where the signal is sampled by integration techniques or filtered to produce signals that represent a complex value whose phase changes at a rate which is half of the symbol rate.