Patent EP0690588A2 successfully refreshed from Google Patents.
EP0690588A2
Expired / Lapsed
EP
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RAKE receiver combining all the useful multipath components of a spread spectrum signal
Assignee: Roke Manor Research Ltd
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Filing: 1995-06-14
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Granted: —
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Expires: 2015-06-14
Abstract
Abstract The present invention extends the Rake architecture as discussed in co-pending patent application number 9316989.5 in which the need for a set of Rake fingers covering a continuous range of delays in one chip steps is removed. The apparatus only comprises a small number of Rake fingers, one or more of which is assigned at any given time to perform a searching operation. Whenever the searching Rake finger or fingers finds a path with higher energy than the current lowest Rake finger the roles of the Rake finger are exchanged.
Inventors
- 👤 Anthony Peter Hulbert
- 👤 Robert Julian Steadman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 16:21
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7097; H04B1/711; H04B1/7115; H04B1/7117; H04B1/709; H04B1/712; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70707; H04B2201/7071
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
Apparatus for use in equipment providing a digital radio link between a fixed and a mobile radio unit, said apparatus comprising a plurality of Rake fingers and means for controlling the operation of each Rake finger so that at any given time one Rake finger is arranged to search the delay spread, and means for examining the energy of each Rake finger so that whenever a Rake finger is found to have an energy lower than that found by the Rake finger currently searching, the Rake finger with the lower energy takes over the searching function while the previous Rake finger that was searching becomes all active Rake finger.
Claim 2
Dependent Claim
53 words
Apparatus as claimed in claim 1, wherein a shift register receives a digital complex baseband signal and each stage of the shift register is connected in parallel to each Rake finger, and each Rake finger is arranged with means for selecting which shift register stage is to be accepted by the Rake finger.
Claim 3
Dependent Claim
18 words
Apparatus claimed in claim 2, wherein the means of selecting the shift register stage comprises a multiway switch.
Claim 4
Dependent Claim
23 words
Apparatus as claimed in claim 2, wherein the means for selecting the shift register stage comprises a memory arranged to use memory pointers.
Claim 5
Dependent Claim
59 words
Apparatus as claimed in any preceding claim, wherein the means for selecting the shift register stage comprises a controller including means for receiving the outputs from each Rake finger and means for selecting the smallest measured signal received, and is used to control a further switch in the respective Rake finger to control the output from that Rake finger.
Claim 6
Dependent Claim
48 words
Apparatus as claimed in claim 5, wherein the output from the means of selecting the smallest measured level is applied to an input of a respective ring counter under the control of a conflict resolver, and is used to control the means for selecting the shift register stage.
Claim 7
Dependent Claim
17 words
Apparatus as claimed in any preceding claim, wherein the apparatus comprises a differential phase shift keying receiver.
Claim 8
Dependent Claim
30 words
Apparatus as claimed in any one of the preceding claims 1 to 6, wherein the apparatus comprises a binary phase shift keying receiver in which a pilot signal is utilised.
Claim 9
Dependent Claim
18 words
Apparatus as claimed in any preceding claim, wherein a plurality of Rake fingers perform the searching function simultaneously.
References Cited (Backward Citations)
No citation records indexed.
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