Abstract: In one embodiment, a method includes generating a set of sequences of chip values and calculating a correlation between a demodulated signal and each one of two or more of the sequences. Each of the correlations has an absolute value, and one of the correlations has a highest absolute value. The method includes selecting the one of the sequences with the correlation having the highest absolute value; identifying a sequence index corresponding to the selected one of the sequences; and, for each of one or more data symbols in the demodulated signal, determining a value of the data symbol based on the sequence index corresponding to the selected one of the sequences.

Abstract: A transmission circuit and method for transmitting a bit sequence to be transmitted is provided that includes a dividing device for dividing the bit sequence into an even-numbered bit sequence and into an odd-numbered bit sequence, a first device for forming the first sampled values of a first fundamental wave depending on the even-numbered bit sequence, a second device for forming second sampled values of a second fundamental wave depending on the odd-numbered bit sequence, the second fundamental wave being shifted relative to the first fundamental wave by a time period, and includes a summator for summation of the first sampled values of the first fundamental wave and the second sampled values of the second fundamental wave to form an output value sequence.

Abstract: A detection unit is disclosed for the detection of data symbols contained in a demodulated signal, whereby band spreading occurs transmit-side with the use of first sequences, whose first chips each assume one of two different first values.

Abstract: The invention relates to a detection unit for detecting data symbols which are contained in a differentially demodulated signal and to which one respective PN sequence from a supply of sequences can be allocated at the transmission end. The inventive detection unit comprises the following units: a) a sequence supplying unit that is configured for supplying a third group of derived sequences.

Abstract: A transmission circuit and method for transmitting a bit sequence to be transmitted is provided that includes a dividing device for dividing the bit sequence into an even-numbered bit sequence and into an odd-numbered bit sequence, a first device for forming the first sampled values of a first fundamental wave depending on the even-numbered bit sequence, a second device for forming second sampled values of a second fundamental wave depending on the odd-numbered bit sequence, the second fundamental wave being shifted relative to the first fundamental wave by a time period, and includes a summator for summation of the first sampled values of the first fundamental wave and the second sampled values of the second fundamental wave to form an output value sequence.

Abstract: A device for transmitting and receiving is disclosed that includes: a) an antenna, b) a transmitting/receiving unit for transmitting and receiving data according to a communications standard, which has a transmitting unit, connected to the antenna, for transmitting first data frames to a second transmitting/receiving device and a receiving unit, connected to the antenna, for receiving second data frames from the second transmitting/receiving device, and c) a control unit, connected to the transmitting/receiving unit for controlling the transmitting/receiving unit, whereby the control unit is designed (c1) to instruct the transmitting/receiving unit to transmit a first data frame and (c2) to receive the second data frame from the transmitting/receiving unit.

Abstract: A method for determining an unknown position of a transmitting/receiving unit of a number of transmitting/receiving units of a radio network, use of a signal quality, and radio network. In the method, a signal field strength and/or a transit time of a signal received through an antenna is measured. A signal quality of the signal received through the antenna is determined. The measured signal field strength and/or the transit time is weighted on the basis of the determined signal quality, wherein the unknown position of the transmitting/receiving unit among the transmitting/receiving units is calculated from multiple weighted signal field strengths and/or transit times and known positions of the transmitting/receiving units.

Abstract: A correlation device is provided that includes an adder for adding an input signal sequence and an auxiliary signal sequence to obtain an addition signal sequence, and a delay element for delaying the addition signal sequence to obtain the auxiliary signal sequence, whereby the delay element has a plurality of coefficient outputs for providing addition signal sequence coefficients. The correlation device comprises further a linking element for the coefficient-wise linking of an addition signal sequence coefficient with a linking coefficient to obtain a correlation result.

Abstract: A method and device is provided for the detection of data symbols contained in a received radio signal, whereby each data symbol is allocated transmit-side a symbol value-specific PN sequence of successive PN chips in the chip clock and the PN sequences allocated to the data symbols are offset QPSK modulated. The method of the invention for incoherent detection provides for converting the received radio signal into a complex baseband signal sampled in the chip clock, generating a demodulated signal by differential demodulation of the complex baseband signal sampled in the chip clock, providing the derived sequences, calculating correlation results by correlating the demodulated signal with the derived sequences, and deriving, i.e., detecting, the values of the data symbols by evaluating the correlation results.

Abstract: An antenna diversity method and a corresponding communication device are disclosed that may be used in wireless LAN receivers. An AGC (Automatic Gain Control) unit controls a gain when processing signals received from antennae. A periodical switching process is performed between at least two antennae. During this periodical switching process, signals from each of the antennae are received alternately. The gain obtained by processing each received signal by means of the AGC unit is monitored and the obtained gain is compared with a predetermined threshold value. When for one of the at least two antennae the gain is below the predetermined threshold value, the periodical switching process is stopped and the antenna used at the time when stopping the periodical switching process is selected. This technique may provide an improved antenna diversity of low complexity, high performance and a short settling time.

Abstract: A WLAN (Wireless Local Area Network) receiver is provided that provides at least two acquisition units and at least two tracking units. The acquisition units perform a synchronization acquisition process, and the tracking units perform a synchronization tracking process. The acquisition units are arranged for being operated sequentially while the tracking units are arranged for being operated simultaneously. In an embodiment, frequency and phase error correction may be performed separately, and those units that operate at higher sampling rates may be located before lower-rate units. The synchronization process may include data-aided as well as non data-aided algorithms.

Abstract: A WLAN (Wireless Local Area Network) receiver is provided that has a power normalization unit that receives an input signal having a signal power within a given power range. The power normalization unit outputs a signal that is derived from the input signal by applying one of at least two different power normalization functions to the input signal. The power normalization unit comprises a power determination unit for determining the signal power, and a function selection unit for determining one of at least two subranges of the power range. The determined subrange includes the signal power. The function selection unit is further arranged for selecting one of the power normalization functions dependent on the determined subrange. By subdividing the power range and applying power normalization functions dependent on the respective subrange, simplified circuitry may be used by avoiding the calculation of the reciprocal square root function.

Abstract: A detection unit is disclosed for the detection of data symbols contained in a demodulated signal, whereby band spreading occurs transmit-side with the use of first sequences, whose first chips each assume one of two different first values.

Abstract: A device for transmitting and receiving is disclosed that includes: a) an antenna, b) a transmitting/receiving unit for transmitting and receiving data according to a communications standard, which has a transmitting unit, connected to the antenna, for transmitting first data frames to a second transmitting/receiving device and a receiving unit, connected to the antenna, for receiving second data frames from the second transmitting/receiving device, and c) a control unit, connected to the transmitting/receiving unit for controlling the transmitting/receiving unit, whereby the control unit is designed (c1) to instruct the transmitting/receiving unit to transmit a first data frame and (c2) to receive the second data frame from the transmitting/receiving unit.

Abstract: A phase error correction technique in data communication receivers such as WLAN (Wireless Local Area Network) receivers is provided. A signal having a phase error is received, and a phase error correction mechanism having a loop structure is operated on the input signal to correct the phase error. The corrected signal still has a residual phase error. The residual phase error is then compensated taking into account a loop time delay of the loop structure. Further, a phase change rate may be taken into account, and a smoothing process may additionally be performed.

Abstract: A signal pre-processing device particularly in wireless LAN devices is provided that comprises an AGC (Automatic Gain Control) unit, an ADC (Analog-to-Digital Converting) unit and a normalization unit. The AGC unit amplifies a received analog input signal and outputs an amplified analog signal. Further, it automatically controls an amplification gain when amplifying the analog input signal. The ADC unit receives the amplified analog signal, converts it into a digital signal and outputs the digital signal. The normalization unit is receives the digital signal, applies a normalization function to the digital signal and outputs the normalized digital signal. Thus, less precise AGC units can be used, thereby reducing production costs as well as the size and complexity of the AGC unit. Further, shorter circuit development times are obtainable.

Abstract: A WLAN (Wireless Local Area Network) receiver having a synchronization unit is provided. The synchronization unit comprises a first functional unit for performing a first signal processing function, a second functional unit for performing a second signal processing function different from the first signal processing function, and at least one signal processing circuit. In the synchronization unit the first functional unit is operating at least one of the signal processing circuits for performing the first signal processing function, and the second functional unit is arranged for operating the at least one signal processing circuit operated by the first functional unit for performing the second signal processing function. Since the above-described signal processing circuits or modules can be re-used for the antenna diversity unit and the preamble detection unit this results in a smaller number of gates and an improved density of the circuitry.

Abstract: A phase error correction technique in data communication receivers such as WLAN (Wireless Local Area Network) receivers is provided. A signal having a phase error is received, and a phase error correction mechanism having a loop structure is operated on the input signal to correct the phase error. The corrected signal still has a residual phase error. The residual phase error is then compensated taking into account a loop time delay of the loop structure. Further, a phase change rate may be taken into account, and a smoothing process may additionally be performed.

Abstract: A WLAN (Wireless Local Area Network) receiver having a synchronization unit is provided. The synchronization unit comprises a first functional unit for performing a first signal processing function, a second functional unit for performing a second signal processing function different from the first signal processing function, and at least one signal processing circuit. In the synchronization unit the first functional unit is operating at least one of the signal processing circuits for performing the first signal processing function, and the second functional unit is arranged for operating the at least one signal processing circuit operated by the first functional unit for performing the second signal processing function. Since the above-described signal processing circuits or modules can be re-used for the antenna diversity unit and the preamble detection unit this results in a smaller number of gates and an improved density of the circuitry.

Abstract: A WLAN (Wireless Local Area Network) receiver is provided that has a power normalization unit that receives an input signal having a signal power within a given power range. The power normalization unit outputs a signal that is derived from the input signal by applying one of at least two different power normalization functions to the input signal. The power normalization unit comprises a power determination unit for determining the signal power, and a function selection unit for determining one of at least two subranges of the power range. The determined subrange includes the signal power. The function selection unit is further arranged for selecting one of the power normalization functions dependent on the determined subrange. By subdividing the power range and applying power normalization functions dependent on the respective subrange, simplified circuitry may be used by avoiding the calculation of the reciprocal square root function.