Abstract: A receiver for receiving a multi-carrier modulated symbol is arranged to suppress a burst noise signal which may have been induced in the symbol. The symbol includes a plurality of pilot carriers as well as a plurality of data bearing carriers. The receiver comprises a burst noise detection processor operable to detect the temporal position of the burst noise signal which may have corrupted the symbol within a period occupied by the symbol, and a channel estimation processor operable to generate a decimated noise signal corresponding to the burst noise, from the recovered pilot carriers. An inverse Fourier transform of the decimated noise signal provides a plurality of estimated versions of the burst noise signal. A noise signal processor is operable to generate an estimate of the burst noise signal by identifying one of the plurality of estimated burst noise versions at the detected temporal location of the burst noise signal.

Abstract: The invention relates to a receiver in a spread spectrum system, comprising reception means for receiving a spread spectrum signal. The receiver comprises interference cancellation means configured to cancel multiuser interference and external interference from the received spread spectrum signal in one or more interference cancellation stages. The invention further relates to an interference cancellation method in a spread spectrum system.

Abstract: A wireless mobile station comprising: a plurality of finger units for performing spread demodulation of a downstream signal transmitted from a base station through a transmission channel; and a rake unit for combining the spread-demodulated downstream signals which are outputted from each of the finger units, wherein both of the finger units and the rake unit share and perform arithmetic operation for compensating channel estimation of the spread-demodulated downstream signal.

Abstract: A measured signal, such as a high-speed digital pulse, transmitted through a system is corrected. The measured signal is sampled to a sampled signal sequence, and a signal series is provided as a plurality of the sampled signal sequences put together successively. The signal series is windowed with a window function, and a corrected measured signal is recalculated from the windowed signal series using information about the frequency-dependency of the system.

Abstract: A receiver system that receives signals and has a demapper device that is responsive to an equalizer output and generates a demapper output including one or more bit metrics. The receiver system also generates equalizer output, and the demapper uses distance measure to calculate bit metrics. The receiver system uses demapper output to generate a processed output. The receiver system further includes a convolutional decoder which is responsive to the processed output, and subsequently generates a decoded bit sequence, as well as uses the processed output to generate one or more path metrics. The convolutional decoder uses bit metrics and path metrics to the decode processed output, to generate a decoded bit sequence. The receiver system uses the distance measure to reduce the size of the bit metrics and the size of the path metrics to improve the performance of said convolutional decoder.

Abstract: Adaptive transition density data triggered PLL (Phase Locked Loop). A novel solution is presented within a data triggered PLL whereby the missing data edge transitions may be detected and used to modify a phase difference between a data signal and a feedback signal and/or a current of a CP (Charge Pump) thereby maintaining a substantially constant loop bandwidth of the PLL for varying data edge transition rates. In one embodiment, an estimation of a substantially linear shift in PLL phase relative to the data phase is employed in the absence of data edge transitions. Alternatively, other means of implementing the shifts may be employed (e.g., non-linear) as desired in particular applications. This solution provides for a data triggered PLL that is practically impervious to variations in data edge transition density.

Abstract: One code is generated by combining (including addition) 2 or more codes, correlation detection method which detects the correlation by multiplying such a generated code by the reception data. In communication system based on W-CDMA method, first spreading code (a·Cp) obtained by multiplying primary synchronization code with a predetermined coefficient and second spreading code (a·Cs) obtained by multiplying secondary synchronization code with a predetermined coefficient are added. Then, the third spreading code (a·Cp+a·Cs) obtained from such an addition is multiplied by the reception data, and correlation value is obtained after integrating the multiplication results. Thus, it is determined whether the reception data has been subjected to STTD diversity.

Abstract: Techniques for performing equalization of multiple signals received by a terminal in soft handoff with multiple base stations. The received signal at the terminal is conditioned and digitized to provide a stream of received samples, which is then equalized/filtered with multiple sets of coefficients to provide multiple streams of transmit chip estimates. One set of coefficients is provided for each base station and is used to provide a corresponding stream of transmit chip estimates. The multiple streams of transmit chip estimates are further processed to provide multiple streams of data symbol estimates, one stream of data symbol estimates for each base station. The multiple streams of data symbol estimates are then scaled with multiple scaling factors and combined to provide a stream of combined data symbol estimates. The processing for the multiple base stations may be performed by a single hardware unit in a time division multiplexed manner.

Abstract: A demodulation apparatus that can support various oscillation frequencies. The portable phone device includes a frequency synthesizer for generating a local-oscillation signal having a local oscillation frequency for converting the frequency of an input receiving signal into an intermediate frequency based on an oscillation signal generated by an TCXO and a synchronization hold portion provided with an NCO for generating a signal having a predetermined frequency based on the oscillation signal generated by TCXO. The frequency synthesizer makes the local oscillation frequency variable by setting the dividing ratio variable in accordance with an arbitrary oscillation frequency so that the intermediate frequency remains within a predetermined range regardless of the oscillation frequency, and an NCO makes the frequency of the signal variable by setting the dividing ratio variable in accordance with the oscillation frequency.

Abstract: A method and apparatus for controlling an antenna array for wireless communication are described. The method uses the statistical characteristics of the received signal noise in controlling the antenna array in order to achieve directional reception in a wireless communication system and suppress co-channel interference. Furthermore, the method can be used to power space-division multiple access and can be used in conjunction with multi-carrier modulation signaling.

Abstract: A communication system compensates pulse positioned modulated data signals for channel induced intersymbol interference and extracts pulse positioned encoded data from a received signal corrupted with the channel induced intersymbol interference. The communication system has a transmitter and a receiver. The transmitter includes a modulation apparatus that has a symbol mapping circuit, which receives data symbols to be transmitted and maps the data symbols to a transmission code. The receiver has a demodulation apparatus to recover data symbols in the presence of the channel induced intersymbol interference. The demodulation apparatus has a sampling circuit in communication with a signal receiving circuit within the receiver to sample at a regular period received data symbols acquired by the receiving circuit. The samples of the data samples are retained by a sample retaining circuit in communication with the sampling circuit.

Abstract: The present invention provides a UWB transmitter and receiver, the transmission rate of which is increased, and the SN ratio of which is improved. By investigating the polarity of an echo at ½ position of the chip period Tc, the chip period is shortened to Tc/2 where the polarity of the echo is the same and a pulse signal of the same polarity is continued, whereby it becomes possible to increase the transmission rate. Because the echo and the pulse signal are caused to overlap each other, the SN ratio can be improved.

Abstract: An audio data transmitting device with a varying channel count which on the transmission side includes, data of n channels divided into blocks each defined for m channels where n?m. In addition, prior to a transmission of the audio data, a transmitted-data stream matching a predetermined transmission format is generated to include determination information used for determining which portions of each block is allocated to which portions of each block containing no valid data. On the reception side, the determination information included in the received transmitted-data stream matching the predetermined transmission format is used to identify the unused channels not assigned to valid data in each of the blocks composing the transmitted-data stream which allows data of the valid channels to be extracted from the stream.

Abstract: An adaptive multicarrier wireless communication system, apparatus and associated methods are generally disclosed herein. In at least one embodiment, channel state information is used to perform bit loading and power allocation within a multicarrier system. In an example technique, after active subcarriers have been identified for a multicarrier channel and an initial power distribution has been made, a subset of active subcarriers may be found that exceed a channel quality performance threshold. Excess power may then be identified by determining how much power could be reduced in the identified subcarriers so that they still meet, but do not exceed the channel quality performance threshold. In one possible approach, the excess power may be re-allocated to other subcarrier subsets.

Abstract: A digital receiver comprises a quadrature zero intermediate frequency tuner supplying I and Q components to adjustable low pass analog filters. In the case of OFDM signals, a demodulator contains a measuring arrangement which determines the average power of carriers at the band edges and the average power of the OFDM carriers. These are compared and a controller increases the passbands of the filters 7 and 8 until the average level of the edge carrier is substantially equal to the average level of all of the carriers.

Abstract: A method and apparatus for adaptive signal compression of unknown signals uses minimal power and bandwidth to transmit data. The method provides adaptive signal compression with minimal loss and distortion by extracting only information of interest and recreating the full signal. The method uses a single resolution filter bank for channelizing a data stream for transmission. The method removes unwanted or unneeded information before transmitting the data by using fidelity and user controls and detection capabilities. The method provides significant signal compression where signals are sparse in frequency, time, or both and does not rely on a priori knowledge of the signal. After transmission, the system generates a signal using the data received as well as filling in the non-transmitted portions of the signal by manipulating the transmitted data. The system then formats the signal into the original data stream using a reconstruction filter bank.

Abstract: A system for clockless synchronous data recovery is provided. The system includes an input rate demultiplexer receiving a serial data stream of bits of data transmitted at a bit rate and generating two or more parallel data streams from the serial data stream. One or more delays coupled to the input rate demultiplexer each receives one of the generated parallel serial data streams and delays bits of data and feeds them back to the input rate demultiplexer.

Abstract: A method for determining the presence of multiple carrier frequency components in an electrical signal by calculating a value for at least one characteristic of the set of peaks in a defined portion of the frequency spectrum, such as the number of peaks within a defined portion of the frequency spectrum or the average spacing between pairs of peaks, and defining a range of values of the characteristic that would indicate the presence of multiple carrier components, and comparing this calculated characteristic value against the values in the defined range of values.

Abstract: A PCM encoder which receives asynchronous serial data and incorporating the serial data and eight channels of analog data into a PCM data stream. The encoder includes a microprocessor which processes the serial data provided in eight bit digital words and the analog data which the microprocessor converts to twelve bit digital words. The encoder also has a programmable gate array which receives six bits of data during each transfer of data from the microprocessor to the gate array. The gate array for the PCM encoder also receives a Frame Sync, and then processes the data to provide a data stream containing NRZL data and Bi Phase data.

Abstract: The present invention is a filtering apparatus in an 8 Phase Shift Keying (8PSK) system. The filtering apparatus comprises a ?/16 phase shift module, a weight distribution module, and a combination module. The ?/16 phase shift module is used for shifting a second vector from a 3?/8 phase shift module with ?/16 radians to generate a corresponding third vector. The weight distribution module is used for distributing a plurality of selected weights to a predetermined distribution waveform and storing a plurality of corresponding weighted distribution waveforms. The combination module, according to the third vector, is used for determining which weight distribution waveforms to be selected from the weight distribution module and combining the selected weighted distribution waveforms to generate a modulation signal. The filtering apparatus and method of the present invention may save a lot of memory in the filtering process.