Digital Radio Systems
First Claim
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1. An apparatus comprising channel estimation means for estimating a channel through which a receiver acquires a signal and Rake receiver means for operating on said signal, wherein the Rake receiver means is arranged to implement a finger for each tap in the channel estimate.
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Abstract
Apparatus comprising a pre-filter rake architecture with various features designed to, in at least some circumstances, to lessen the data processing burden associated with the architecture. In one embodiment, the pre-filter aspect can be disabled.
66 Citations
15 Claims
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1. An apparatus comprising channel estimation means for estimating a channel through which a receiver acquires a signal and Rake receiver means for operating on said signal, wherein the Rake receiver means is arranged to implement a finger for each tap in the channel estimate.
- 2. An apparatus comprising Rake receiver means, pre-filter means, configuring means and evaluation means, wherein the pre-filter means operates on an input to the Rake receiver means, the input represents a signal received through a physical channel, the evaluation means is arranged to evaluate the channel and the configuring means is arranged to re-configure the pre-filter means based on an assessment of the channel after an interval determined with regard to the properties of the channel as determined by the evaluating means.
- 4. An apparatus comprising Rake receiver means, pre-filter means and configuring means, wherein the pre-filter means operates on an input to the Rake receiver means, the pre-filter means and the Rake receiver means form the basis of an LMMSE receiver and the configuring means is arranged to calculate filter coefficients for use in the pre-filter means and is arranged to make those coefficients symmetrical.
- 6. An apparatus comprising pre-filter means and Rake receiver means, which together form the basis of an LMMSE receiver, means for determining filter coefficients for use in the pre-filter means from a signal that is provided for processing through the pre-filter means and the Rake receiver means and means for delaying the signal that is provided to the pre-filter means in order to reduce time misalignment at the pre-filter means between the signal and the coefficients.
- 8. A method of ameliorating channel effects present in a signal received through a channel, the method comprising assessing the interference affecting the signal and processing the signal to ameliorate channel effects, if intra-cell interference dominates inter-cell interference in the signal, in a manner comprising filtering the signal through filter means to ameliorate channel dispersion in the signal and then processing the signal through Rake receiver means or, if intra-cell interference does not dominate inter-cell interference in the signal, in a manner comprising processing the signal through the Rake receiver means without prior amelioration of channel dispersion by the filter means.
- 10. A method of quantising soft decisions, the method comprising determining a quantisation step and using the step to quantise soft decisions obtained by demodulating symbols constituting a signal, wherein the size of the quantisation step is determined with regard to an amplitude distribution of the symbols.
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13. An apparatus comprising pre-filter means, Rake receiver means, channel estimation means and a physical connection between the channel estimating means on the one hand and the Rake receiver means and the pre-filter means on the other hand, wherein the channel estimating means is arranged to, when a signal without transmit diversity is acquired, estimate the physical channel through which the signal is received and is arranged to, when a signal with transmit diversity is acquired, produce a combined channel estimate for the physical channels through which the signal is received and the apparatus is arranged such that said connection is used for providing both types of channel estimate to the Rake receiver means and to the pre-filter means.
- 14. An apparatus for processing a communications signal that has been acquired through a physical channel, the apparatus comprising a plurality of Rake receiver modules each arranged to process the signal under the guidance of a different channel estimate.
Specification