Abstract: A communications device includes a signal input for receiving both wideband and in-band, narrowband communication signals having wideband communications data that is transmitted over a wideband communications channel and narrowband communications data that is transmitted within an in-band, narrowband channels over the same wideband communications channel. A circuit splits the communications signals into a wideband signal channel and narrowband signal channels. A narrowband filter within the wideband signal channel filters the wideband communications signal and removes any narrowband communications signals. A demodulator within the wideband signal channel demodulates the filtered wideband communications signal to obtain any wideband communications data. An in-band, narrowband demodulators are positioned within the narrowband signal channels and demodulate the narrowband communications signals to obtain any narrowband communications data.

Abstract: A decoding device may include a sequential convolutional code decoder, and a parallel convolutional code decoder. The decoding device may further include a controller for selectively processing a convolutionally encoded input signal via at least one of the sequential convolutional code decoder and the parallel convolutional code decoder. The selection of decoder may be based upon a signal-to-noise ratio or the passage of time, for example.

Abstract: A communications device includes a signal input for receiving signals such as a binary phase shift keyed (BPSK) communications signal having a repeated preamble bit or symbol pattern. A modem processes the communications signal and includes a demodulator and processor that generates an initial frequency offset estimate and phase error estimate by processing such as with a Fast Fourier Transform (FFT), that detects the repeated preamble pattern for a block of samples within the communications signal, correlates two halves of the block of samples with a plurality of different shifted sequences and determines a maximum correlation value for the shifted sequence that provides the maximum correlation value to establish a symbol timing estimate based on the known timing alignment of this shifted sequence. Radio circuitry is operative with the modem for processing communications data obtained from the communications signal.

Abstract: A communications device includes a signal input for receiving signals such as a binary phase shift keyed (BPSK) communications signal having a repeated preamble bit or symbol pattern. A modem processes the communications signal and includes a demodulator and processor that generates an initial frequency offset estimate and phase error estimate by processing a Fast Fourier Transform (FFT) that detects the repeated preamble pattern for a block of samples within the communications signal, correlates within a start of message correlator to search for a start of message sequence and correlates different phases of the repeated preamble pattern within training correlators for reducing false detections of the start of message. Radio circuitry is operative with the modem for processing communications data obtained from the communications signal.

Abstract: A radio device includes a transmitter having a modulator for generating M-PAM communications symbols containing communications data. A Fast Walsh Transform circuit orthogonally encodes and band-spreads the communications symbols using the Fast Walsh Transform. A frequency modulation circuit frequency modulates the communications symbols wherein a constant radius orthogonal Walsh modulated communications signal containing the communications data is generated.

Abstract: A mobile ad-hoc network includes a plurality of N mobile nodes and wireless communication links connecting the mobile nodes, which each include a communications device for transmitting and routing data packets wirelessly to other mobile nodes via the wireless communication links in accordance with a time division multiple access (TDMA) data transmission protocol using a TDMA epoch that is divided into a beacon interval, digital voice interval and digital data interval. The mobile nodes monitor channel conditions using the beacon, digital voice and digital data intervals and provide a network conductivity performance as valid receptions occur within mobile nodes. A data rate is calculated and set for other N?1 mobile nodes using monitored channel conditions for the beacon, digital voice and digital data intervals.

Abstract: A repeated preamble bit or symbol pattern such as for a binary phase shift keyed (BPSK) communications signal is received within a modem. An initial frequency offset and phase error estimate is generated by processing a Fast Fourier Transform (FFT) that detects the repeated preamble pattern for a block of samples within the communications signal. Two halves of the block of samples are correlated with a plurality of different BPSK shifted sequences to obtain a symbol timing alignment based on the shifted sequence providing the maximum correlation value. A frequency offset estimate is iteratively updated an N number of times using the shifted sequence providing the maximum correlation value to refine an acquisition estimate of the frequency offset and phase error of the received communications signal.

Abstract: Method for modulating an RF signal includes the steps of modulating an RF signal using frequency shift keying (FSK) modulation to define a plurality of symbols (2030, 2031). The FSK modulation includes transitioning the modulated signal (204) between at least two different frequencies (f1 and f0) during a guard period (210). The method includes the further step of varying a frequency of the modulated signal 204 during the guard period (210) in accordance with a predetermined rate of change. The predetermined rate of change is selected to minimize a bandwidth of the RF signal.

Abstract: A mobile wireless communications device may include an antenna, a transceiver coupled to the antenna, and a controller coupled to the transceiver. The controller may be configured to determine a received signal characteristic, and to configure parameters of a waveform for adjacent forward transmission blocks to be transmitted as sequential forward transmission blocks and based upon the received signal characteristic. Each forward transmission block may have a preamble portion and an associated body portion. The controller may be further configured to set the preamble portion of each forward transmission block to communicate the parameters of the configured waveform.

Abstract: A wireless communication device operates in a wireless communications system including a plurality of wireless communication devices and communicates over a wireless medium. The wireless communication device includes an antenna, a transceiver coupled to the antenna, and a controller to cooperate with the transceiver. The controller is configured to generate and transmit a waveform having a waveform frame format including data blocks and repeating training blocks, and to modulate the repeating training blocks to reduce spectral artifacts. The controller may be configured to modulate the repeating training blocks with a pseudo-random phase, a frequency offset or with an amplitude modulation, for example.

Abstract: A receiver includes a signal input for receiving a differentially-encoded quadrature phase-shift keyed (DEQPSK) communication signal. A demodulator performs bit decisions on a received coherent symbol and bit decisions on a received differential symbol. A processor is operative with the demodulator and scales a soft decision by a factor from 0 to 1 when the results of the bit decisions on the received coherent branch and differential branch are different.

Abstract: A system communicates data and includes an encoder for encoding communications data. A modulator maps the communications data based on a specific mapping algorithm to form a communications signal over which the communications data can be transmitted. The communications signal includes a preamble that has set-up or transmission parameters used for acquiring the signal at a modem and at least one extended preamble for conveying additional set-up or transmission parameters. This extended preamble includes N extended preamble bits having at least one of information, transmission parameter and control bits and M map bits that identify a predetermined mapping for the N extended preamble bits.

Abstract: A communication system receives a modulated signal that carries encoded communication data. An adaptive filter has a plurality of adaptive filter taps and weighted coefficients and a variable delay circuit operative before the adaptive filter taps for separating the spacing of multipath introduced by adaptive filter and producing a filtered output signal with improved multipath performance. A demodulator and decoder receive the filtered output signal from the adaptive filter and demodulate and decode the signal to obtain the communications data.

Abstract: A system apparatus and method generates a communications signal having an error detection mechanism. A circuit generates a data packet. An encoder multiplies and accumulates data words with values in a distance table containing non-repeated n-bit multipliers having “m” number of one bits that are set to obtain accumulated sum bits and appends the accumulated sum bits to the data packet as an error detection code to form a communications signal to be transmitted.

Abstract: A communications system receives a modulated signal that carries encoded communications data. An adaptive filter has an input, a plurality of non-adaptive and adaptive filter taps with weighted coefficients, and an output. The received signal is passed through the adaptive filter and around adaptive filter and a switch selects which signal to pass to demodulator based on measured output power of the adaptive filter and of the original received signal. A demodulator and decoder receive the filtered output signal and demodulate and decode the signal to obtain the communications data.

Abstract: A decoder includes at least one programming input for a plurality of programmable reduced-state trellis parameters. A programmable device is connected to the at least one programming input and implements a reduced-state maximum likelihood decoder that is operable for processing a continuous phase modulated (CPM) signal and returning up to N bits that were transmitted based on a maximum likelihood and current winning super-state and corresponding survivor full-state. The programmable device calculates the path metrics for every super-state and determines a best path based on the reduced-state trellis parameters.

Abstract: A programmable decoder includes at least one programming input for a plurality of programmable, reduced state trellis parameters. A programmable device is connected to the at least one programming input and implements a Reduced-State Sequence Estimation (RSSE) decoder comprising at least one reduced-state trellis structure based upon the plurality of programmable reduced-state trellis parameters, including one of at least the number of super-states, the number of full-states, the number of branches per super-state, a reverse super-state trellis table, a decoder super-state survivor as a full-state, a forward full-state table, a full-state to super-state mapping table, a decoder super-state path metric and decoder super-state traceback array.

Abstract: A mobile ad-hoc network (MANET) may include mobile nodes establishing wireless communications links therebetween. The mobile nodes may communicate based upon an avalanche or relay communications protocol. Each mobile node may comprise a wireless transceiver, and a decorrelation filter cooperating therewith for reducing interference from other mobile nodes. For example, the decorrelation filter also reduces one or more of multi-path interference from other mobile nodes or narrow band interference from other sources.

Abstract: A wireless communication system may include a first wireless communications device, and a second wireless communications device. The first wireless communications device may include a wireless transmitter, and a modulator coupled to the wireless transmitter for modulating input data to generate a Gaussian phase shift keyed signal having a selected data symbol mapping. The second wireless communications device may include a wireless receiver, and a demodulator coupled to the wireless receiver for demodulating the Gaussian phase shift keyed signal using memory-less symbol decisions based upon the selected data symbol mapping.

Abstract: A wireless communications device may include a wireless receiver for receiving a Gaussian phase shift keyed signal having a selected data symbol mapping, and a demodulator coupled to the wireless receiver for demodulating the Gaussian phase shift keyed signal using memory-less data symbol decisions based upon the selected data symbol mapping.