Abstract: Various example embodiments are disclosed herein. According to an example embodiment, an apparatus may include a multiple modulation index continuous phase encoder (CPE) configured to perform continuous phase encoding on one or more received symbols and to output CPE encoded symbols, the CPE being configured to a known initial state prior to receiving a data block of one or more symbols, and a termination symbol (TS) generator coupled to the CPE, the TS generator configured to generate one or more termination symbols to be appended to the received data block, wherein an ending state of the CPE after receiving the one or more termination symbols is the same as the known initial state of the CPE.

Abstract: A signal is generated in the time domain (e.g., GSM, CDMA waveform), digitally sampled at a rate N per symbol interval T over an observation window of length JT to achieve a vector of JN samples. The JN samples are transformed via a DFT of size JN to the frequency domain, where they are mapped using the DFT coefficients to subcarriers of an OFDM or SC-FDMA waveform. Then an IDFT is executed to convert the samples back to the time domain, which are then transmitted on the mapped subcarriers. For the case of a portable device cognitive radio, subcarriers other than the JN subcarriers may be used for pilots or zero weights may be applied to them. For the case of a network node, pilots or samples for other users may be mapped to the other subcarriers, in which case the IDFT is size M>JN for transforming all the user signals.

Abstract: A technique is provided to generate a sequence of symbols to be transmitted, comprising transmitting a block of symbols having data and redundancy symbols, the redundancy symbols generated based on the data symbols, a first part of the redundancy symbols transmitted as a prefix of the block, a second part of the redundancy symbols transmitted as a postfix of the block and a third part of the redundancy symbols transmitted as an intermediate part of the block between the prefix part and postfix part. The first part may be generated from the symbols transmitted at the end of a data portion of the block, the second part may be generated from the symbols transmitted at the start of the data portion of the block, the third part may be generated from an entire sequence of non-redundant data symbols transmitted in the first half of the data portion of the block.

Abstract: This invention relates to a method, a computer program, a computer program product, a transmitter and a receiver for a multicarrier modulation, wherein symbols are assigned to carriers of a set of N carriers, the method comprising assigning at least one of the symbols to a first carrier of the set of N carriers, and assigning an antipodal representative of the at least one of the symbols to a second carrier of the set of N carriers.

Abstract: Various example embodiments are disclosed herein. According to an example embodiment, a method may include receiving a plurality of data symbols, generating a continuous phase modulated waveform based on the data symbols, generating a plurality of coefficients which represent the continuous phase modulated waveform, and wirelessly transmitting the plurality of coefficients via a plurality of subcarriers.

Abstract: According to one general aspect, a method including receiving noisy data via a communications channel, wherein the noisy data includes a clean data component and a noise component. In various embodiments, the method may also include decoding, utilizing a low-density lattice code (LDLC) matrix, the received noisy data to substantially recover the clean data component. In some embodiments, the LDLC matrix may not include a matrix of less than a length of six cycles. In one embodiment, the LDLC matrix may be algebraically constructed. In various embodiments, the method may include storing the decoded clean data component.

Abstract: To reflect advantages of a constant phase modulation waveform, the invention provides a pulse amplitude modulated PAM waveform that is a superposition of Q0?2L?1 PAM component pulses in each symbol interval such that a significant portion of signal energy over each symbol interval is within the Q0 PAM component pulses. The present invention distributes most signal energy in one pulse and progressively lower energies in the remaining Q0?1 pulses of a symbol interval. The Laurent Decomposition is a special case of the present invention, but the present invention exhibits the energy distribution of the Laurent Decomposition in non-binary CPM waveforms and in multi-h (binary and non-binary) CPM waveforms, where h is a modulating index. All energy is distributed among only Q=2L?1 pulses in each symbol interval, though only Q0<Q pulses may in fact be transmitted in certain embodiments. A method, transmitter, receiver, and computer program are disclosed.

Abstract: To reflect advantages of a constant phase modulation waveform, the invention provides a pulse amplitude modulated PAM waveform that is a superposition of Q0?2L?1 PAM component pulses in each symbol interval such that a significant portion of signal energy over each symbol interval is within the Q0 PAM component pulses. The present invention distributes most signal energy in one pulse and progressively lower energies in the remaining Q0?1 pulses of a symbol interval. The Laurent Decomposition is a special case of the present invention, but the present invention exhibits the energy distribution of the Laurent Decomposition in non-binary CPM waveforms and in multi-h (binary and non-binary) CPM waveforms, where h is a modulating index. All energy is distributed among only Q=2L?1 pulses in each symbol interval, though only Q0<Q pulses may in fact be transmitted in certain embodiments. A method, transmitter, receiver, and computer program are disclosed.

Abstract: A signal is generated in the time domain (e.g., GSM, CDMA waveform), digitally sampled at a rate N per symbol interval T over an observation window of length JT to achieve a vector of JN samples. The JN samples are transformed via a DFT of size JN to the frequency domain, where they are mapped using the DFT coefficients to subcarriers of an OFDM or SC-FDMA waveform. Then an IDFT is executed to convert the samples back to the time domain, which are then transmitted on the mapped subcarriers. For the case of a portable device cognitive radio, subcarriers other than the JN subcarriers may be used for pilots or zero weights may be applied to them. For the case of a network node, pilots or samples for other users may be mapped to the other subcarriers, in which case the IDFT is size M>JN for transforming all the user signals.

Abstract: The present invention provides a new and unique method and apparatus for providing an estimate of a mobile location of a wireless node, point or terminal in a wireless local area network (WLAN) or other suitable network, the estimate being based on a correlation of a radio frequency (RF) signal strength measurement and a grid point in a signal strength database or radio map. The signal strength database or radio map is built using a signal strength fingerprint algorithm. The signal strength fingerprint algorithm includes selecting and measuring a set of grid points in the wireless local area network (WLAN) or other suitable network.

Abstract: According to one general aspect, a method including receiving noisy data via a communications channel, wherein the noisy data includes a clean data component and a noise component. In various embodiments, the method may also include decoding, utilizing a low-density lattice code (LDLC) matrix, the received noisy data to substantially recover the clean data component. In some embodiments, the LDLC matrix may not include a matrix of less than a length of six cycles. In one embodiment, the LDLC matrix may be algebraically constructed. In various embodiments, the method may include storing the decoded clean data component.

Abstract: Various example embodiments are disclosed herein. According to an example embodiment, an apparatus may include a multiple modulation index continuous phase encoder (CPE) configured to perform continuous phase encoding on one or more received symbols and to output CPE encoded symbols, the CPE being configured to a known initial state prior to receiving a data block of one or more symbols, and a termination symbol (TS) generator coupled to the CPE, the TS generator configured to generate one or more termination symbols to be appended to the received data block, wherein an ending state of the CPE after receiving the one or more termination symbols is the same as the known initial state of the CPE.

Abstract: Various example embodiments are disclosed herein. According to an example embodiment, a method may include receiving a plurality of data symbols, generating a continuous phase modulated waveform based on the data symbols, generating a plurality of coefficients which represent the continuous phase modulated waveform, and wirelessly transmitting the plurality of coefficients via a plurality of subcarriers.

Abstract: Various example embodiments are disclosed herein. According to an example embodiment, an apparatus for use in a wireless transmitter may include a phase encoder adapted to generate a continuous time signal based on a symbol and a corresponding modulation index for a current symbol interval and one or more previous symbol intervals and based on a continuous phase modulation (CPM) phase response function, a filter and symbol-rate sampler adapted to filter and then symbol rate sample the continuous time signal to generate a symbol-rate statistic that is representative of the continuous time signal for each of the symbol intervals; a mapping circuit adapted to map each of the plurality of symbol-rate statistics to a corresponding constant modulus CPM symbol, and a transmitter circuit adapted to transmit a signal based on the constant modulus CPM symbols.

Abstract: A method is described for generating a M-D CPM waveform as a constant envelope, continuous phase signal capable of conveying a plurality of information symbols per symbol interval. Additionally, it provides for reducing the phase state space of the M-D CPM waveform, for reducing a number of trellis states required for demodulation of the M-D CPM waveform, and for implementing generalized tilted phase decomposition to reduce the cardinality of the phase state space of the multi-dimensional CPM waveform by a factor of 2. A device, computer program product and apparatus are also described.

Abstract: Apparatus, and an associated method, for a radio communication system having a sending station and a receiving station. The sending station sends data pursuant to a communication service and ultrawide band signals pursuant to a selected time-hopping sequence. An ultrawide band signal detector is positioned at the receiving station. The ultrawide band signal detects the ultrawide band signal transmitted thereto. Correlation is made between the detected ultrawide band signal and a locally-generated replica signal. Correlations therebetween are used to facilitate various receiving station operations, such as equalization operations upon received data, time synchronization of the receiving station to the sending station, and position determination of the positioning of the receiving station.

Abstract: Apparatus, and an associated method, for determining the geographical positioning of a mobile station operable in a mobile radio communication system. Wideband signals are generated during pseudo-random time periods by a plurality of base transceiver stations. The ultra-wideband signals are of large bandwidths, e.g., 2 GHz, and of low signal energy levels. The mobile station detects the wideband signals sent thereto and, responsive thereto, determination of the geographical positioning of the mobile station is determined.