Ubinetics Limited

Cambridge Silicon Radio Limited

Analog Devices,inc.

Qualcomm Technologies International, Ltd.

Diego Giancola

Andrew Papageorgiou

Gerald Alun Williams

David Chappaz

Jason Paul Woodard

Andrew Thurston

Andrew J Papgeorgiou

Jonathan Lucas

Bhimantoro Y Prasetyo

A radio receiver comprising a compensator arranged to compensate for intersymbol interference in a signal received at the receiver and a configurator arranged to configure the compensator, wherein the compensator comprises a programmable filter and the configurator is capable of configuring the filter in a first mode to operate as an ISI equaliser or in a second mode to implement a RAKE finger set.

Multimode receiver architecture

A receiver for a telecommunications system, wherein the receiver is capable of using a plurality of available alternative receiver sub-systems and the receiver comprises selection means for selecting one of the plurality of receiver sub-systems for use in processing a received signal according to conditions of the propagation channel through which the received signal was received.

Receiver comprising selectable signal processing sub-systems

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.

Device and method of data combining

Apparatus for classifying a ray is disclosed, wherein the ray is received at a code division multiple access receiver. The apparatus comprises: means for receiving a neighbouring cell list comprising at least information concerning scrambling codes used by, and timing information concerning at least one neighbouring cell; means for selecting a cell from the neighbouring cell list, the cell having associated therewith one or more scrambling codes; means for determining whether the number of cells in the neighbouring cell list exceeds a threshold; means responsive to a positive determination for attempting to classify the ray to the selected cell without utilising means for mixing a received signal with a scrambling code; and means responsive to a negative determination for mixing a received signal with a scrambling code used by the selected cell to provide a mixed signal, and for examining the mixed signal to determine if the ray originates from the cell.

Method and apparatus for fast W-CDMA acquisition

A method of classifying a ray is disclosed, the ray being received at a code division multiple access receiver. The method comprises: determining if a timing characteristic of the ray falls within a predetermined range of a timing characteristic of a ray classified to a given cell; in response to a positive determination, mixing a received signal with a scrambling code used by the given cell to provide a mixed signal; and examining the mixed signal to determine if the ray originates from the given cell.

Apparatus for classifying a ray is disclosed, wherein the ray is received at a code division multiple access receiver. The apparatus comprises: means for receiving a neighbouring cell list comprising at least information concerning scrambling codes used by at least one neighbouring cell; means for selecting a scrambling code used by a given neighbouring cell; means for mixing a received signal with the selected scrambling code to provide a mixed signal; and means for examining the mixed signal to determine if the ray originates from the given neighbouring cell.

An input signal is mixed with a scrambling code and with an OVSF code, and then accumulated over a period of time equal to one symbol of the pilot channel before being reset. The resultant complex signals are mixed with the conjugate of complex signals provided by a pilot pattern generator, with the result being fed to a delay line (). A multiplier multiplies the complex value at a location P(n) in the delay line () by the conjugate of a complex value at another location P(n+k), and provides the resulting complex number (which is a complex vector whose phase is a coherent measurement of the phase rotation occurring between the symbols corresponding to the two locations) at an output (). The real part of the complex signal provided at the output () is provided to a first combiner (), and the imaginary part is provided to a second combiner (). These combiners () also receive corresponding signals from all of the other fingers (not shown) of the rake receiver. Each combiner () coherently sums all of the signals at its inputs and provides the result to its respective accumulator (), which provide coherent filtering. The phase rotation of the combined and accumulated signals is then calculated. Once convergence of the frequency of an LO with the frequency of the received signals is achieved, the value of k is increased.

Rake receiver and a method of providing a frequency error estimate

An input signal is a complex vector whose phase is a coherent measurement of the phase rotation occurring between two separated symbols of a received CDMA signal. A processing block () provides a first signal showing the magnitude and the sign of the imaginary part of the input signal, and a second signal showing the magnitude and sign of the real part of the input signal to an initialisation block (). A quadrant determination block () examines the signs of the signals to determine the quadrant in which the phase of the input signal exists. A comparator block () determines if the magnitude of the first signal is greater than or equal to the magnitude of the second signal. If a negative determination is made, the magnitude of the first signal is doubled in a multiplication block () to form a multiplied signal, and a counter incremented, initially from zero. The comparator block () then determines if the multiplied signal is greater than or equal to the magnitude of the second signal. This continues until the multiplied signal is equal to or exceeds the magnitude of the second signal. Carried to an upscaling block () is the multiplied signal (or the first signal if there is no multiplied signal), the magnitude of the second signal and the count of the counter (M). The upscaling block () examines the multiplied signal (or the first signal) and determines an upscaling factor. The multiplied signal (or the first signal) is multiplied by the scaling factor, as is the second signal, and the upscaled signals are provided to an angle determination block (). The phase error &#x3b8;in degrees is estimated by the formula &#x3b8;=45&#xb0;/2.

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Cambridge, United Kingdom

Diego Giancola