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Chappaz, GB
David Chappaz, Cambridgeshire GB
| Patent application number | Description | Published |
|---|---|---|
| 20110159830 | RECEIVER - A receiver ( | 06-30-2011 |
David Chappaz, Cambridge GB
| Patent application number | Description | Published |
|---|---|---|
| 20100272168 | RECEIVER - A receiver for a telecommunications system in which a data signal is transmitted using a closed loop transmit diversity system and a pilot signal is transmitted using a space time transmit diversity system, the receiver comprising an equalizer for equalising a signal received by the receiver, wherein the equalizer is configured to produce an equalized signal in which effects caused by a propagation channel through which the data signal was transmitted are alleviated, the receiver further comprising a processor for processing the equalized received signal to recover the pilot signal. | 10-28-2010 |
| 20110065382 | SCHEMES FOR THE EFFICIENT RECEPTION OF RADIO COMMUNICATIONS SIGNALS - Receiving a Wi-Fi radio signal using a Bluetooth receiver architecture. Also, adapting a Wi-Fi receiver architecture to constrain a received radio signal to less than the bandwidth of a conveyed Wi-Fi signal for subsequent processing purposes. | 03-17-2011 |
| 20110122970 | DUAL PRUPOSE MODULATOR - The present invention provides a single modulator capable of transmitting an input according to a first and a second modulation technique. The first modulation technique represents changes in the input using a first set of carrier waveform parameters, such as phase variations, whereas the second modulation technique represents changes in the input using a second set of carrier waveform parameters, such as alternative phase variations. The present invention performs both modulation techniques by expressing the 10 second set of carrier waveform parameters as a subset of the first set of carrier waveform parameters. In a preferred embodiment, the first and second modulation techniques comprise the π/2-offset 2PSK (a good approximation of differential GMSK) and 3π/8-offset 8PSK (also known as EDGE) modulation techniques. | 05-26-2011 |
David F. Chappaz, Cambridgeshire GB
| Patent application number | Description | Published |
|---|---|---|
| 20100034251 | ESTIMATION OF SYMBOLS OF TRANSMITTED SIGNALS USING HYPOTHESES - A method of estimating a symbol that has been transmitted into a channel connecting a modulator for producing modulation symbols and an equaliser, wherein a channel estimate describes said channel and the method comprises: calculating a metric for each of a number of hypotheses of a sequence commencing with the symbol under estimation followed by a number of subsequently transmitted symbols, each symbol in the sequence occupying a respective node of the sequence; and deeming the symbol at the beginning of the hypothesis that has the best metric to be the symbol under estimation; wherein calculating a metric for a given hypothesis comprises: calculating a discrepancy metric at each node of the given hypothesis; and combining the discrepancy metrics of nodes in the given hypothesis to produce the metric; and wherein a discrepancy metric for a given node of a given hypothesis is an assessment of the difference between: a sample received from said channel at a time point corresponding to said given node; and a sample that would be received at that time point if said channel estimate were acting on a model signal comprising the symbols of the given hypothesis up to the given node preceded by any estimates of symbols transmitted into the channel immediately prior to said time point as may be required to fill the estimated channel. The invention also relates to corresponding apparatus. | 02-11-2010 |
| 20100197260 | SIGNAL POWER ESTIMATION - Two versions of the auto-covariance matrix of a received signal are obtained. One version is dependent upon the fraction of the power of a transmission site that goes into the wanted signals and a value is sought for this fraction that produces a good match between the two versions. | 08-05-2010 |
David F. Chappaz, Cambridge GB
| Patent application number | Description | Published |
|---|---|---|
| 20110019726 | METHOD AND APPARATUS FOR PERFORMING LOG-LIKELIHOOD CALCULATIONS - A method and apparatus for performing calculations relating to the derivation of log-likelihood ratio (LLR) is provided. Coefficients in the use of deriving LLRs are calculated the calculation being applicable to any one of a plurality of constellation diagrams (PAM, QAM, PSK). The coefficients may be stored in a table of coefficients, the table corresponding to a particular constellation diagram and modulation scheme. A number of tables may be stored, each table corresponding to a particular modulation scheme. The coefficients are related to a symbol estimated to be closest to the received sample and the closest symbol to the estimated symbol having a complementary value for a bit for which the LLR is to be calculated. Certain coefficients or parts of coefficients may be omitted where the corresponding constellation diagram has symmetries. | 01-27-2011 |
| 20110096765 | BRUTE FORCE CHANNEL DECODING - An embodiment of the present invention provides that pre-calculated code words corresponding to possible input bit sequences are stored in a UE, and then a similarity matching operation performed between a received coded bit sequence and the stored code words can be performed to identify that code word which most closely matches to the received sequence. Because the stored code words are associated with the original input bit sequences which produced those code words, by identifying the most closely correlating code word to a received coded sequence, then the input sequence which generated the matching code word can also be identified, and output as the decoder output. In this way, a more efficient decoding operation is obtained as decoding is no longer dependent upon a Viterbi decoding operation and moreover it is no longer necessary to implement a Viterbi decoder, instead merely requiring storage for the pre-calculated code words. In the specific case of the HS-SCCH Part | 04-28-2011 |
David Franck Chappaz, Cambridgeshire GB
| Patent application number | Description | Published |
|---|---|---|
| 20100185923 | DECODING OF RECURSIVE CONVOLUTIONAL CODES BY MEANS OF A DECODER FOR NON-RECURSIVE CONVOLUTIONAL CODES - Embodiments of the invention provide a decoder arrangement ( | 07-22-2010 |
David Franck Chappaz, Cambridge GB
| Patent application number | Description | Published |
|---|---|---|
| 20090147886 | Adaptive IQ Alignment Apparatus - A method and apparatus for aligning I- and Q-signals in a quadrature receiver based on an squared signal. A correction is evaluated in an iterative manner by finding an average of the squared signal. The average squared signal may be the received signal, in which case the iterations are applied in a feed forward manner. Alternatively, the average squared signal is the aligned signal in which case the iterations are applied in a feed back manner. The correction may include the evaluation of an normalisation or, in the feed back case, this can be implicitly included in the manner in which the iteration is applied. Various parameters to the iteration can be set to accommodate the operating environment of the receiver and characteristics of the received signal. | 06-11-2009 |
David Frank Chappaz, Cambridge GB
| Patent application number | Description | Published |
|---|---|---|
| 20100011271 | DEVICE AND METHOD OF DATA COMBINING - A device and method of combining a first version of an information block and a second version of the information block is disclosed. The method comprises calculating, prior to combining the first and second versions of the information block, a scaling factor to be applied in combining the first and second versions of the information block to produce a scaled combined information block. | 01-14-2010 |