Abstract: A wireless mobile device comprising a tuner for converting a received radio frequency signal to a base band signal or intermediate frequency signal and providing the base band signal or intermediate frequency signal to a receiver, wherein the receiver is arranged to provide received data associated with the base band signal or intermediate frequency signal to an application processor for storage in memory, wherein the application processor is arranged to extract the data from memory in an interleaved form and perform error correction on the interleaved data.

Abstract: An arrangement (300) and method, for iterative channel impulse response estimation in a system such as a GSM/EDGE system employing a transmission channel, by: producing (310) from a received signal (y) a channel impulse response estimate signal (p); and producing (320) from the received signal (y) a noise estimate signal (w) which is iteratively fed back to improve the channel impulse response estimate signal (p). The noise estimate signal comprises a matrix (w) respresenting the inverse of noise covariance; the matrix may be calculated at each iteration or may be selected from predetermined values corresponding to statistics of expected noise. This provides the advantages of reduced complexity, independence of the equalization method used to produce the channel impulse response estimate signal, and consequent performance improvement.

Abstract: A wireless mobile device comprising a tuner for converting a received radio frequency signal to a base band signal or intermediate frequency signal and providing the base band signal or intermediate frequency signal to a receiver, wherein the receiver is arranged to provide received data associated with the base band signal or intermediate frequency signal to an application processor for storage in memory, wherein the application processor is arranged to extract the data from memory in an interleaved form and perform error correction on the interleaved data.

Abstract: A wireless mobile device comprising a base band receiver for providing received data to an application processor for storage in memory, wherein the application processor is arranged to provide to the base band receiver the data extracted from the memory in interleaved form for error correction.

Abstract: An arrangement (300) and method, for iterative channel impulse response estimation in a system such as a GSM/EDGE system employing a transmission channel, by: producing (310) from a received signal (y) a channel impulse response estimate signal (p); and producing (320) from the received signal (y) a noise estimate signal comprises a matrix (w) which is iteratively fed back to improve the channel impulse response estimate signal (p). The noise estimate signal comprises a matrix (w) respresenting the inverse of noise covariance; the matrix may be calculated at each iteration or may be selected from predetermined values corresponding to statistics of expected noise. This provides the advantages of reduced complexity, independence of the equalization method used to produce the channel impulse response estimate signal, and consequent performance improvement.

Abstract: Transceiver circuitry 1 comprises a first portion 10,20,30,41,50,100, having a first modulation means 41 operating at a first order of modulation, for transmitting and receiving voice signals; a second portion 20,30,42,50,100, having a second modulation means 42 operating at a second order of modulation, for transmitting and receiving digital signals at a higher data rate than is achievable by the first portion; and a data conversion means 20,30,100 operable to convert from or into voice signals intended for processing by the first portion into or from digital signals for processing by the second portion.

Abstract: A device is provided for selecting reception signals as a function of their power, the reception signals being identified by their frequency and being structured into frames made up by a number of time slots. Power is calculated for each one of the signals being explored using as a basis measurements carried out on several selected time slots that correspond to the signal during a series of repetitive analysis periods. The selected time slot of the first signal explored during an analysis period bearing a number less than or equal to the number of time slots that make up a frame occupies a different position in the frame from the positions that it occupied during preceding analysis periods.

Abstract: A device for recovering an original bit stream from a received bit stream by processing the received bit stream in accordance with the Viterbi algorithm comprises an operator to establish the maximal metric of rank r of the state E.sub.j denoted Met.sub.r (E.sub.j) for r greater than n and the (r-n) th bit of the bit stream corresponding to the metric from input values which are maximal metrics of rank r-1 of states E.sub.2k and E.sub.2k+1 denoted Met.sub.r-1 (E.sub.2k) and Met.sub.r-1 (E.sub.2k+1) and the conditional probabilities related to the states E.sub.2k, E.sub.2k+1) that the r-th bit of the bit streams associated with these states has a determined value denoted (Pr(b(r)+0/E.sub.2k) and (Pr(b(r)=0/E.sub.2k+1) for example where k is equal to 2j for any value of j less than 2.sup.n-1 and has the value 2(j-2.sup.n-1) for any value of j greater than or equal to 2.sup.n-1, so that Met.sub.r (E.sub.j) takes the larger of the values of the expressions Met.sub.r (E.sub.j)+(Pr (b (r)=0/E.sub.2k) and Met.sub.

Abstract: A digital signal is equalized, for example in cellular radio systems, to combat intersymbol interference. Each sample received is associated with an estimated symbol representing the transmitted symbol. The equalization process comprises an iterative stage of intersymbol interference elimination, each iteration comprising for each sample of a set of received samples whose value has not been determined during a previous iteration: comparing said sample with at least one confidence threshold and if said sample exceeds any of said thresholds: associating with said sample an estimated symbol whose value depends on said threshold exceeded, the value of said sample being then determined; and eliminating the intersymbol interference caused to other samples belonging to said set of received samples by said estimated symbol.

Abstract: A digital cellular radiocommunication system includes a circuit for evaluating the frequency difference between a local signal and the carrier wave of a receive signal which are close together in frequency, the receive signal having been subjected to phase state modulation by a modulation signal and thus having a phase that includes a transmission phase shift, a modulation phase shift corresponding to one of a plurality of phase states, and a synchronization phase shift due to the frequency difference. The circuit produces samples of the receive signal from which the transmission phase shift has been eliminated, detects the modulation phase shift of the samples in order to eliminate it, produces the mean phase of a series of samples, and produce the frequency difference on the basis of the mean phase of at least two series of samples and on the basis of the time interval between the middles of the series.

Abstract: The present invention relates to a measurement circuit for providing the digital value of an analog electrical signal. The digital measurement circuit for measuring an analog electrical signal produces a measurement signal (M) and includes an amplifier (1) which receives said electrical signal (I), followed by an analog-to-digital converter (2) which delivers digital data (N). The gain of the amplifier (1) is controlled by a control signal (C) and said gain can take up at least two values. The measurement circuit further includes a control unit (3) producing said control signal (C) and storing the digital data corresponding to different gain values, and includes means for producing the measurement signal (M) on the basis of said digital data (N).

Abstract: A circuit for recovering the carrier of a digitally modulated wave having a phase symmetry 2.pi./M, wherein M is the order of the symmetry, includes means for automatic and fast acquisition comprising a voltage-controlled oscillator having an output supplying said carrier and a control input to which an error signal .epsilon.(.phi.) is applied in order to change the oscillator phase and to adjust it to the phase of the digital modulated wave. This wave is introduced in two channels, one being in phase and the other being in quadrature with the carrier, each comprising the series arrangement of: a demodulator, a low-pass filter, reconstruction means for reconstructing a signal and for determining the error between the filtered and reconstructed signals, the quadrature channel comprising in addition a 90.degree. phase shifter, the two channels being joined together with the aid of a phase comparator arrangement which produces a comparison signal and a variable-rate sampling clock.

Abstract: A digital data receiving arrangement, which adapts itself to channel variations of a transmission system, comprises an adaptive receiver stage (11), having an adaptive equalizer and at least one sampler, and producing, at a certain rate, complex samples y.sub.k from the input signal x(t), a decision circuit (14) supplying detected complex samples a.sub.k and an adaptive timing recovery circuit (12) determining the optimal sampling instant by minimizing a quadratic function J which represents the difference between y.sub.k and a.sub.k. The adaptive timing recovery circuit comprises a device (121) for shaping a primary clock signal in accordance with a secondary clock signal, whose period is twice the period of the primary clock and whose consecutive ascending edges are spaced in time by T.sub.1 and T.sub.2, said secondary clock producing alternately two sampling instants .tau. and .tau.+.DELTA..tau.. By minimizing the function J, on the basis of the difference determined for two instants .tau..sub.k and .tau..

Abstract: An adaptive equalizer arrangement for digital transmission system comprises at the output of the transmission channel a first in-phase path and in parallel with this first path, a second quadrature path, both paths being of the non-recursive transversal filter type having n branches and (n-1) delay circuits between the inputs of these branches, each of these n branches comprising, arranged in series, a mixer, a low-pass filter, a multiplier, and having their outputs connected to an adder which is followed by a sampling circuit and thereafter by a comparator circuit to decide the symbols to be transmitted from the outputs of these paths. The arrangement also comprises a third control path which comprises two subtracting circuits to determine the differences between the signals before and after decision and a control circuit of a voltage-controlled oscillator, 2n phase shifters and 2n multipliers.