Abstract: The present invention relates to a transmitting apparatus (82) for transmitting signals in a multi carrier system on the basis of a frame structure, each frame comprising at least one signalling pattern and one or more data patterns, said transmitting apparatus (82) comprising frame forming means (59) adapted to arrange first signalling data in said at least one signalling pattern in a frame, and adapted to arrange data in said one or more data patterns in a frame, whereby the data of said one or more data patterns are arranged in data frames, each data frame comprising second signalling data and content data, transforming means (60) adapted to transform said at least one signalling pattern and said one or more data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means (61) adapted to transmit said time domain transmission signal.

Abstract: Inter-carrier interference caused by frequency fluctuations, amplitude fluctuations, phase fluctuations, or the like is reduced without reducing a transmission efficiency. A receiving end has a canceling filter section that alleviates the inter-carrier interference caused by the frequency fluctuations, the amplitude fluctuations, the phase fluctuations, or the like through filtering processing. A transmitting end has a precoding section that facilitates determination of demodulation data in a vector demodulation section on the receiving end through precoding processing. Or, the receiving end has a trellis decoding section that decodes the demodulation data through trellis decoding processing.

Abstract: A fast and simple method evaluates the capacity of OFDM-based radio networks using adaptive modulation and coding. From a mapping of SINR values to achievable data throughput, constant coefficients defining a linear function for the required channel activity of a single user are determined. Subsequently, linear equations for total uplink and downlink channel activity are obtained which allow fast numerical solutions.

Abstract: A data processing apparatus maps input symbols to be communicated onto a predetermined number of sub-carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processor includes an interleaver memory which reads-in the predetermined number of data symbols for mapping onto the OFDM sub-carrier signals. The interleaver memory reads-out the data symbols on to the OFDM sub-carriers to effect the mapping, the read-out being in a different order than the read-in, the order being determined from a set of addresses, with the effect that the data symbols are interleaved on to the sub-carrier signals. The set of addresses are generated from an address generator which comprises a linear feedback shift register and a permutation circuit.

Abstract: A method of delineation of a packet-based data stream in order to identify a boundary between neighbouring packets in the data stream, wherein the data stream comprises a predetermined number of bits (N); the method comprising the steps of: processing the data stream to search for the boundary between neighbouring packets in the data stream; characterised in that the method further comprises calculating the greatest common divisor (GCD) of a bit skip integer (n) where (N) and (n) are co-primes; iteratively checking after each n bits to identify the boundary between the neighbouring packets.

Abstract: Provided is a constellation rotation relay system and constellation rotation relay method which can acquire full diversity gain by performing constellation rotation for a channel matrix in a relay network when configuring a virtual MIMO channel. The constellation rotation system includes a matrix creator for creating a symbol matrix by configuring a symbol transmitted in parallel from a source of a relay network; and a constellation rotation unit constellation rotating the symbol in the symbol matrix by adding a constellation rotation matrix to the created symbol matrix.

Abstract: An apparatus and method for detecting a Cyclic Prefix (CP) length in a mobile communication system are provided. The apparatus includes first, second, third and fourth correlators, an average unit, and a length detector. The first, second, third and fourth correlators respectively correlate first, second, third and fourth CP parts within a frame boundary. The average unit averages the correlation values of the first, second, third and fourth correlators. The length detector determines the CP as an extended CP if the average value minus the correlation value of the fourth correlator is greater than a first threshold value. Accordingly, less memory may be required to determine a CP length as compared to the conventional art.

Abstract: The present invention relates to a transmitting apparatus (54) for transmitting signals in a multi carrier system on the basis of a frame structure, each frame comprising at least one signalling pattern and one or more data patterns, said transmitting apparatus comprising frame forming means (59) adapted to arrange signalling data in said at least one signalling pattern in a frame, and to arrange data and at least one pilot signal in said one or more data patterns in a frame, whereby the length of each of said one or more data patterns in the frequency direction is equal to or a multiple of a minimum data pattern length, transforming means (60) adapted to transform said at least one signalling pattern and said one or more data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means (61) adapted to transmit said time domain transmission signal.

Abstract: A system and method for estimating sample clock frequency offset (?s) in a digital radio mondiale (DRM) system such as, for example, DRM receivers. The system and method includes using a relationship given by the following equation: ? s = linearfit ( angle ? ( P G m P G ? _ ? tr m P G m ? - ? cycle P G ? _ ? tr m ? - ? cycle ) , l ) × N 2 ? ? × cycle × ( N + L ) wherein the PGm is the gain pilot received in the mth symbol and PG—trm is the gain pilot transmitted in the mth symbol, the PGm-cycle is the gain pilot received in (m-cycle)th symbol, the PG—trm-cycle is the second gain pilot transmitted in (m-cycle)th symbol, the l is the index of the sub-carrier associated with the gain pilot, the N is a factor of a sample point number of a useful symbol, the L is a sample point number of a guard interval, and the cycle is the interval of two symbols which are inserted gain pilots at the same sub-carriers (l).

Abstract: A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel of the communications network. Digital data is encoded into DBPSK data using differential binary phase shift keying encoding. The DBPSK data is then sent across the cellular network using a vocoder having a linear predictive or other speech compression codec. At the receiving end, the DBPSK data is demodulated back into the original digital data. This approach permits data communication via a CDMA, GSM, or other type of voice traffic channel at a low bit error rate.

Abstract: A method and a device (4) for block interleaving of size K with N iterations of index j, N being greater than or equal to 1, of input digital data items indexed by a variable k={0, . . . , K?1}. The interleaving method uses a turbo structure that has two inputs and one output. At the end of each iteration j, the interleaving law I(j)(k) at the output of the interleaver (4) is modified in accordance with an input sequence formed by the position indices of the data items before interleaving (typically a ramp) and in accordance with an interleaved sequence (which provides the position of the data items after interleaving) resulting from the previous iteration of the same interleaving algorithm.

Abstract: A media access control (MAC) layer controller can manage base layer data and enhancement layer data in a layered modulation system. The MAC layer controller can process both base layer data and enhancement layer data and map the encoded symbols to a layered modulation constellation when both are present. If data for one of the layers terminates, then the MAC layer controller can generate and supply predetermined stuffing data to the layer lacking additional data. The MAC layer controller can send a control signal to the physical layer hardware to cause the hardware to map the layered signals having the stuffing data to a modified signal constellation. The MAC controller can also generate an overhead message that indicates the occurrence of the stuffing data. The receiver can receive the overhead message and can use the information to configure the receiver for the layered modulation constellation or the modified signal constellation.

Abstract: A method for providing communication in a wireless network comprising one or more simultaneously operating pico networks includes dividing UWB spectrum into a plurality of frequency bands. These bands are formed into band groups. At least one band group is assigned to each one of the pico networks. At least pne time frequency code is assigned to symbols associated with each one of the pico networks on a transmission-by-transmission basis. A system for channelization of the spectrum includes a frequency-synthesized oscillator and a time frequency code generator configured to assign time-frequency codes to successive transmissions of a pico network such that the successive transmissions are transmitted in all frequency bands of a band group assigned to the pico network.

Abstract: Improvements are provided in an OFDM network that uses superposition coding. A broadcast signal and e.g. a unicast signal are each subjected to OFDM modulation including processing by an IDFT, combined, and transmitted using non-orthogonal transmission resources. In one approach, the respective signals are combined after instead of before the IDFT processing. In specific examples, a respective cyclic prefix is appended to each signal after the IDFT processing but before the respective signals are combined. In another approach, a broadcast pilot signal and e.g. a unicast pilot signal are transmitted concurrently with the broadcast and unicast information signals. The pilot signals are transmitted using the same time and subcarrier resources, but are made more distinguishable by combining each with a respective scrambling or spreading code. In specific examples, embodiments, the unicast pilot signal is used for estimating the data rate for transmission of further unicast information signals.

Abstract: Data is transmitted by using continuous frames each of which includes a variable-length part having a length that varies depending on an input period and a fixed-length part containing data of one input period. The transmitted continuous frames are received, a frame period is detected, and data is reproduced based on the detected frame period.

Abstract: A base station, for allocating to a mobile station a radio resource in a time direction and a frequency direction of a frame to perform radio communications with the mobile station, includes a zone forming unit configured to apply to zones, into which the frame is partitioned in the time direction, one of pilot transmission methods different in terms of a pilot allocation or a pilot directivity and in an allocation of transmission data to a plurality of mobile stations in a first zone adjacent to a second zone with a pilot transmission method different from the pilot transmission method of the first zone applied to the second zone, a scheduler configured to schedule a first mobile station moving at a low speed to a vicinity of a boundary with the second zone at a higher priority than a second mobile station moving at a high speed.

Abstract: An electronic device includes a first circuit (111) operable to generate a precoding matrix index (PMI) vector associated with a plurality of configured subbands, and further operable to form a compressed PMI vector from the PMI vector wherein the compressed PMI vector includes one reference PMI and at least one differential subband PMI defined relative to the reference PMI; and a second circuit (113) operable to initiate transmission of a signal communicating the compressed PMI vector. Other electronic devices, processes and systems are also disclosed.

Abstract: An arithmetic process of a quadratic formula that is contained in an exponent of a CAZAC sequence-defining expression is converted to an arithmetic process of a recursion formula to find the above-described exponent, the above-described exponent that was found is used to generate a CAZAC sequence, and the above-described CAZAC sequence that was generated is taken as the reference signal for transmitting and receiving or as a random access preamble signal.

Abstract: A data processing apparatus communicates data bits on a predetermined number of sub-carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processing apparatus comprises a parity interleaver operable to perform parity interleaving on Low Density Parity Check (LDPC) encoded data bits obtained by performing LDPC encoding according to a parity check matrix of an LDPC code including a parity matrix corresponding to parity bits of the LDPC code, the parity matrix having a stepwise structure, so that a parity bit of the LDPC encoded data bits is interleaved to a different parity bit position. A mapping unit maps the parity interleaved bits onto data symbols corresponding to modulation symbols of a modulation scheme of the OFDM sub-carrier signals.

Abstract: A method of transmitting a scheduling request which is used to request a radio resource for uplink transmission includes configuring an uplink control channel for transmission of a scheduling request in a subframe, the subframe comprising two consecutive slots, a slot comprising a plurality of single carrier-frequency division multiple access (SC-FDMA) symbols, the scheduling request being carried by presence or absence of transmission of the uplink control channel, and transmitting the scheduling request on the uplink control channel.

Abstract: Modulation section 201 performs modulation processing on transmission data. Mapping control section 202 controls mapping of the baseband signal onto the subcarriers so that the important information conventionally transmitted by one subcarrier is transmitted by two subcarriers and one of the two subcarriers should be the subcarrier with a carrier frequency signal of frequency 0 which was conventionally not used. IFFT section 203 performs IFFT processing on the modulated transmission data. Transmission section 204 performs transmission processing on the IFFT-processed transmission data and transmits the processed transmission data from antenna 205.

Abstract: A method for generating a preamble of a data unit includes generating a short training field (STF) of the preamble to include one of a repeating series of a sequences or a repeating series of b sequences, such that a and b are complementary sequences, a sum of out-of-phase aperiodic autocorrelation coefficients of a and b is zero, and where the STF is associated with at least synchronization information, and generating a long training field (LTF) of the preamble after the STF to include a? sequences and b? sequences, such that a? is the sequence a cyclically shifted by zero or more positions, b? is the sequence b cyclically shifted by zero or more positions, and where the LTF is associated with channel estimation information.

Abstract: A method of generating a data unit preamble includes generating a first field associated with at least one of packet synchronization information or frame boundary indication, and generating a second field associated with channel estimation, including generating a first channel estimation sequence (CES) symbol and generating a second CES symbol, so that at least one of 1) a sequence in the first field serves as a cyclic prefix of the first CES symbol, 2) a beginning portion of the second CES symbol serves as a cyclic postfix of the first CES symbol, or 3) an ending portion of the first CES symbol serves as a cyclic prefix of the second CES symbol.

Abstract: A wireless communications network, including a base station (10) and wireless units (UE), is disclosed. The wireless units (UE) request a connection with the base station (10) by the transmission of a preamble within time slots designated by the base station (10). The disclosed preambles are Walsh Hadamard code symbols, repeated a number of times so as to have the same length as a cell-specific scrambling code. The wireless unit (UE) requesting a connection pseudo-randomly selects a time slot from those available, and one of the Walsh Hadamard code symbols, replicates the code symbol into a spread interleaved bitstream, scrambles this bitstream and transmits it to the base station (10). Upon receipt, the base station (10) applies the incoming bitstream to a matched filter (98) to descramble the signal, following which the symbol is de-interleaved by way of a sequence of delay lines (100).

Abstract: The present invention provides a method and apparatus for multi-user multiplexing. The method includes: a transmission apparatus performing layer mapping on data steams to be transmitted of an open-loop user and a close-loop user respectively; the transmission apparatus performing pre-coding processing on a layer data matrix of the open-loop user and the close-loop user obtained by the layer mapping; and the transmission apparatus mapping the layer data matrix after the pre-coding processing to a plurality of transmission antennas to be sent. The method of the present invention can improve frequency spectrum utilization ratio in the case of the a cell being full load or other possible scenarios, and its performance is better than the multiplexing of two close-loop users who are completely not suitable for pairing. Therefore, the method of the present invention is an optimal scheme adopted in some specified scenarios.

Abstract: A cross-layer optimization framework for designing of multi-radio/multi-channel wireless mesh networks with network coding to support multiple unicast applications is used. A column-generation-based primal-dual method is used to solve the optimization problem. For network-layer formation, a code construction scheme based on linear programming is used. Delay constraints are imposed on the network code construction so the possible impact of the extra decoding delay to the upper-layer Transmission Control Protocol/Internet Protocol (TCP/IP) performance may be reduced without changing the upper-layer protocols.

Abstract: A data processor maps input symbols to be communicated onto a predetermined number of sub-carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processor includes an interleaver memory which reads-in the predetermined number of data symbols for mapping onto the OFDM sub-carrier signals. The interleaver memory reads-out the data symbols on to the OFDM sub-carriers to effect the mapping, the read-out being in a different order than the read-in, the order being determined from a set of addresses, with the effect that the data symbols are interleaved on to the sub-carrier signals. The set of addresses are generated from an address generator which comprises a linear feedback shift register and a permutation circuit.

Abstract: A transmission of information from a secondary to a primary node occurs in a plurality of N logical time durations. The transmission from the secondary to primary node in a wireless network is obtained using a first and a second sequence. Embodiments of the present invention mitigate interference by restricting the choice of the first sequence. Thus, in an embodiment of the invention, the first sequence is selected from a set of M sequences wherein M is strictly less than N. In order to accommodate high-velocity users, the restricted set contains a pair of sequences whose element-wise product is mirror symmetric. In other embodiments of the invention, the choices of the first sequence and second sequence in a time-frequency resource is arranged such that interference is mitigated. A transmission component for K-th logical time duration is obtained from the entire second sequence and K-th element of the first sequence.

Abstract: Systems (100) and methods (500) for method for providing a redundant or distinct transmission feature to a communication system (100). The methods involve (508) detecting if there is a communication system fault. If a communication system fault is detected (508:YES), then (512) a plurality of modified transmit signals are generated by combining a transmit signal with a plurality of complex weights (W1, W2, W3). The modified transmit signals are then (514) transmitted from a plurality of antenna elements (106a, 106b, 106c) of the communication system to an object of interest (108). If a communication systems fault is detected (508:NO), then (526) a plurality of redundant or distinct transmit signals are generated by combining the transmit signal with a plurality of first orthogonal or approximately orthogonal numerical sequences. The redundant or distinct transmit signals can then be (528) synchronously transmitted from the antenna elements.

Abstract: The invention relates to a frequency hopping communication method in which the data travels over time-variable frequency bearers. A frequency bearer is defined as a subset pair of carriers in a channel of a set of frequency channels (RF). The choice of the frequency bearers is derived from a pseudo-random draw.

Abstract: A method for data transmissions in a wireless communication system includes: allocating resources for data to be transmitted; providing a seed number from the communication system; setting, based on the seed number, at least one parameter for a pseudo-random mapper having an input variable and an output variable; initializing an array with a number of base elements; increasing a current value of the input variable by a current value of a counter; and calculating a value of the output variable based on the pseudo-random mapper and the increased value of the input variable. The method further includes: swapping a first base element and a second base element in the array, the first base element being identified based on the current value of the counter, and the second base element being identified based on the value of the output variable; performing permutation on the resources by using the array as a permutation sequence; and transmitting the data.

Abstract: A receiver detects and recovers data from Orthogonal Frequency Division Multiplexed (OFDM) symbols, which are transmitted as first and second versions to form a multiple input multiple output (MISO) system and carry pairs of data symbols encoded to form Alamouti cells. A channel estimator and corrector is arranged to form an estimate of the data symbols by generating an estimate of first and second channels. A receiver includes a channel estimator and corrector comprising a pilot data extractor for extracting the pilot data from the OFDM symbols, a frequency dimension interpolator for interpolating between the pilot data received from each of the OFDM symbols in the frequency domain to form sum pilot data and difference pilot data, a sum and difference decoder for combining the sum and difference pilot data to form for each data symbol of the Alamouti pairs an estimate of a sample of the first channel and an estimate of the sample of the second channel, and an Alamouti decoder.

Abstract: A data processing apparatus maps input symbols to be communicated onto a predetermined number of sub-carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processor includes an interleaver memory which reads-in the predetermined number of data symbols for mapping onto the OFDM sub-carrier signals. The interleaver memory reads-out the data symbols on to the OFDM sub-carriers to effect the mapping, the read-out being in a different order than the read-in, the order being determined from a set of addresses, with the effect that the data symbols are interleaved on to the sub-carrier signals. The set of addresses are generated from an address generator which comprises a linear feedback shift register and a permutation circuit.

Abstract: The present invention relates to a fast uplink ranging system and method in a mobile communication system. According to the present invention, a fast uplink ranging system transmits two pairs of ranging codes having the same value at locations spaced by half of FFT pointers. The fast uplink ranging system calculates a correlation value using the received two pairs of ranging codes. An order in which complex exponential twiddle factors for removing complex exponential terms corresponding to a time delay are searched is determined using the correlation value. Therefore, it is possible to reduce a time required for searching a timing error of a terminal using non-periodic symmetry of complex exponential twiddle factors corresponding to the timing error, compared with a known method of searching a complex exponential twiddle factor.

Abstract: Interference management is provided through use of a user-based interference control and/or a network-based interference control. For user-based interference control, the terminals are informed of the inter-sector interference observed by the neighbor sectors and can adjust their transmit powers accordingly so that the inter-sector interference is maintained within acceptable levels. For network-based interference control, each sector is informed of the inter-sector interference observed by the neighbor sectors and regulates data transmissions for its terminals such that the inter-sector interference is maintained within acceptable levels. Each system may utilize only user-based interference control, or only network-based interference control, or both.

Abstract: It is an object to provide a wireless communication base station device that can prevent the decline of a system throughput due to the degradation of a utilization efficiency of a communication resource of a channel for carrying out a frequency diversity transmission when a frequency scheduling transmission and a frequency diversity transmission are concurrently carried out in multiple carrier communication. In the wireless communication base station device, a modulation unit (12) carries out modulation processing for Dch data after coding to generate a Dch data symbol. A modulation unit (22) carries out modulation processing for Lch data after coding to generate an Lch data symbol. An allocation unit (103) allocates the Dch data symbol and Lch data symbol to each sub-carrier composing an OFDM symbol and outputs the allocated sub-carrier to a multiplex unit (104).

Abstract: A method of fighting interference in a frequency-hopping communication system is disclosed. The system has at least one main sensor and one or more auxiliary sensors. According to at least one embodiment, frequency-hopping signals are received. The frequency-hopping signals are arranged to include useful bands and one or more guard bands inserted between the useful bands, and a ratio of the useful bands to the guard bands being chosen according to a predetermined value of probability of interference interception. Signals of the inserted guard bands having a signal level greater than a predetermined threshold are selected. A set of spatial-filtering weightings are calculated according to a correlation matrix of noise plus jammers alone on the signals selected. Baseband signals of the received frequency-hopping signals are filtered by the set of the calculated spatial-filtering weightings.

Abstract: A method of TMCC information acquisition in an ISDB-T/TSB receiver comprises detecting coarse frequency offset in the receiver to identify bins that have TMCC information; and acquiring TMCC and symbol number information from the identified bins. The detecting process may be conducted using different methods and the acquiring process may be conducted using different methods. The TMCC information acquisition method saves memory space and provides enhanced performance by using coarse frequency offset to identify the bins that have TMCC information and obtaining the TMCC and symbol number information from the identified bins.

Abstract: A data processing apparatus maps input symbols to be communicated onto a predetermined number of carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processor includes an interleaver memory which reads-in the predetermined number of data symbols for mapping onto the OFDM carrier signals. The interleaver memory reads-out the data symbols on to the OFDM carriers to effect the mapping, the read-out being in a different order than the read-in, and the order being determined from a set of addresses. The set of addresses are generated from an address generator. The address generator includes a linear feedback shift register and a permutation circuit.

Abstract: Method and apparatus for a wireless receiver are described which derive at least a first stream of first digitized samples from a received analog signal at a first sampling rate and identify a first frequency offset based on a plurality of parallel correlations using complex reference signals which differ from each other by phase offsets. A second frequency offset is identified based on tracking a demodulation accuracy for each symbol which is demodulated from the first stream of digitized samples. These frequency offsets can be used to rotate decision areas in the demodulator. The methods and apparatus may be used in a Bluetooth receiver.

Abstract: A method for soft demapping of complex-valued symbols y(k) (k=1, 2, . . . , K) by calculation of a Logarithm of Likelihood Ratio (LogLR) such that: Log ? ? LR ? ( b I , q ) = ln ? ? ? ? ? S l , q ( 1 ) ? exp ( - 1 2 ? ? ? ? y ~ ? ( k ) - ? ? 2 ) ? ? ? ? S q , l ( 0 ) ? exp ( - 1 2 ? ? ? ? y ~ ? ( k ) - ? ? 2 ) wherein bI,q is the qth coded bit of an in-phase part of a transmitted signal, ? is an asymptotic Signal-to-Interference-plus-Noise Ratio, {tilde over (y)}(k) is a standardized symbol associated with y(k), ? is a reference symbol of QAM constellation associated with a M-QAM modulation, S(1)I,q and S(0)I,q are complex plane partitions that bring together, respectively, all reference symbols ? having a “1” at the position (I, q) and all reference symbols ? having a “0” at the position (I, q), a formula similar to LogLR being given for the bit bQ,p, pth coded bit of a quadrature part of the transmitted signal.

Abstract: A data processing apparatus maps input symbols to be communicated onto a predetermined number of sub-carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processor includes an interleaver memory which reads-in the predetermined number of data symbols for mapping onto the OFDM sub-carrier signals. The interleaver memory reads-out the data symbols on to the OFDM sub-carriers to effect the mapping, the read-out being in a different order than the read-in, the order being determined from a set of addresses, with the effect that the data symbols are interleaved on to the sub-carrier signals. The set of addresses are generated from an address generator which comprises a linear feedback shift register and a permutation circuit.

Abstract: A wireless communication network includes a plurality of base stations capable of wireless communication with a plurality of subscriber stations within a coverage area of the network. At least one of the plurality of base stations is capable of selecting up to four orthogonal frequency-division multiplexing (OFDM) symbols in a subframe of a physical uplink shared channel. The up to four OFDM symbols are selected starting from the bottom a resource grid of the of the physical uplink shared channel in a bottom-up manner. And one or more rank information (RI) coded bits are repeated in each of the selected up to four OFDM symbols.

Abstract: A transmitting equipment is used in a mobile communication system in which a signal obtained by cyclically shifting a predetermined sequence is used for communication. An inverse fast Fourier transform device of the transmitting equipment converts a signal obtained by signal processing on a predetermined sequence in a frequency region into a time region by inverse fast Fourier transform. A cyclic shift device cyclically shifts by a predetermined amount of shift the sequence in the signal converted into the time region by the inverse fast Fourier transform device.

Abstract: An apparatus is provided for transmitting a signal in a communication system. Upon receipt of an information vector, the apparatus includes converting the information vector into a plurality of sub-information vectors; performing coding and modulation on each of the sub-information vectors according to a corresponding mode thereby generating a modulation symbol; interleaving the modulation symbol generated for each of the sub-information vectors; allocating power to the interleaved modulation symbol for each individual mode; and beamforming the modulation symbols power-allocated for each individual mode, and transmitting the beamforming symbols.

Abstract: The invention comprises a method for de-spreading of a data signal spread with a spread spectrum sequence. The invention is especially suited for the improvement of correlations of spread data signals after transmission. Therefor it can be integrated as software or hardware module into existing transmission systems.

Abstract: A technique for channel sounding in a wireless communication system includes determining respective geometries of multiple subscriber stations with respect to a serving base station. Respective time periods for sounding a channel between the multiple subscriber stations and the serving base station are then set based on the respective geometries of the multiple subscriber stations.

Abstract: A wireless receiver detects signals received at two or more antennas, with each antenna coupled to an input receive chain. A switch is employed to couple selected input receive chains to one or more corresponding output receive chains during listening, coarse-detection, and fine-adjustment modes. At least one channel selection filter (CSF) is employed in each output receive chain, and the receiver employs sub-ranging. During idle mode, one antenna's input receive chain is connected to two or more CSFs to detect the packet. When the packet is detected, during a coarse-adjustment mode, the CSFs are reconfigured to couple each antenna's input receive chain to a corresponding output receive chain using low-gain signals. During fine-adjustment mode, the various gains are adjusted to be either high- or low-gain to maintain signals within the dynamic range of the corresponding CSFs.

Abstract: Techniques, systems and apparatus are described for estimating a frequency shift. An apparatus for estimating a frequency shift includes a fast Fourier transform unit to transform a signal of a time domain into a frequency domain and output fast Fourier transform symbols. A complex conjugate multiplier is in communication with the fast Fourier transform unit and output a continual pilot correlation between every two of the fast Fourier transform symbols output from the fast Fourier transform unit. A correlation memory unit is in communication with the complex conjugate multiplier to store the continual pilot correlation output from the complex conjugate multiplier. An adder is in communication with the correlation memory unit to add the continual pilot correlations stored in the correlation memory unit and generate an output signal comprising estimated values of the frequency shift.

Abstract: The present invention relates to a transmission apparatus for transmitting OFDM-signals comprising modulation means 4 for modulating said signals onto a plurality of subcarriers using a OFDM-modulation method, transformation means 5 for transforming said modulated signals into the time domain, and transmission means for transmitting said signals, whereby in said modulation means every M-th subcarrier is modulated, wherein M is an integer and M?2. The present invention also relates to a corresponding transmission method for transmitting OFDM-signals.