Title of Invention

A METHOD OF ACQUIRING SIGNAL INSTANCES IN A RECEIVED SIGNAL IN A WIRELESS COMMUNICATION SYSTEM

Abstract

Techniques to acquire and track pilots in a CDMA system. In an aspect, frequency acquisition of a number of signal instances (i.e. multipaths) in a received signal may be achieved concurrently based on a frequency control loop (RAFC) maintained for each finger processor of a rake receiver. Upon successful acquisition, frequency tracking of acquired multipaths may be achieved based on a combination of a frequency control loop (VAFC) maintained for an oscillagtor used for downconverting the received signal and the RAFCs for the finger processors. In a tracking mode, the VAFC tracks the average frequency of the acquired multipaths by adjusting the frequency of the oscillator. The RAFC of each finger processor tracks the residdula frequency error (e.g. due to Doppler frequency shift) of the individual acquired multipath by adjusting the frequency of a complex sinusoidal signal used in a rotator within the finger processor.

Full Text

WHAT IS CLAIMED IS: CLAIMS 1. In u wireless communication system, a method of acquiring signal in-u; ices :n a revived signal, comprising: acquiring a -frequency of each of one or rr.ore candidate signal instances -with a Kxp.-:ctive .first fuiquency control loop; deleting acquisition on at least cne candidate signal instance; and tracking a.-i average frequency of the at least one acquired signal instance with a sc.:cr;d frequency control loop. 2. The method of claim 1, further comprising: tracking a residual frequency error oi each acquired signal instance with the first fr'-qu^ncy control loop, 3. Ths metiod of ciaim 1, father comprising: transferrins a frequency «?.rror of each acquired signal instance from The first frtfLiiu-ncy control loop to the second frequency control loop. 4. TIK* :tic?!.hod of claim 3, wnercm the frequency error of each acquired sijuw! instance i:» iinn&fcrredhy scaling an ci;tput of a first accin.iLiIai.or for the first frequency eoiiirol loop and iiiiJii- uiv> of the ..Vequency error., and providing the scaled first accumulator output to an input of a second ac: .--utuulatcr for die second frequency control loop. 5. Thit method or claim 3, wherein the frequency error of each acquired sh'.n-u jnsnnce ■* transferred by writing to a second accumulator for the second frequency control loop a value derived from a first accumulator for the first frequency control loop used for the acquired signal instance. 6. Th* method of claim 3, wherein the frequency error of each acquired signal instance is arfcnsf erred by operatively coupling a loop accumulator output for the firs', frequency control loop :;o a loop accumulator input for the second frequency cortvol kv>p. 7. The, method of claim 1, further comprising: downconverting the received signal with a downconversion signal having a frequency determined by the second frequency control loop: and for each candidate signal instance, frequency translating data samples of the dov/frccroverted signal using a frequency determined by the first frequency control loop. 8. The method of claim 1, wherein the second frequency control loop is disabled during the acquisition of the ore or more candidate signal instances. 9. The method of claim I, wherein the first frequency control loop for each acquired signal instance ;\nd the second frequency control loop are enabled during the tracking of the at kast one acquired signal instance, K), The method of claim lv wherein the average frequency is derived via a nni :crm weighting of the frequency of the at least one acquired signal instance. 11. Tie method of claim 1, wherein i.he average frequency is derived via a nor -uniform weighting such that the frequency of a sponger acquired sigind instance is weighted more 'Liar:, the frequency of a weaker acquired signal instance. 12. Tha method of claim 1, wherein the f:vs? and second frequency control loops are configurable to operate in one of a plurality of loop modes. 13. The method of claim 12, wherein rhe first frequency control loop for each candidate signal instance is set to A first loop mode having a wider loop bandwidth for rhe acuuisition. J. 14. The method of clam. 12, wherein the first frequency centre] loop for each acquired signal instance is set to a second joep mode having & narrower loop bandwidth forr.be tracking." 15. The method cf claim 12, wherein each loop mode is associated with a respective scheme lor deriving inputs for a discriminator used to detect frequency error in t\i signal ins^nce. 16 The method of claim I, wherein tiie acquisition is performed concirrendy on a plurality of candidate signal instances. 17. The method of claim I, wherein acquisition on the at least one candidate siijn:ai instance is detected if at least one detector output exceeds a particular threshold ' valu: within a parti: ular time interval IS. The method of claim 1, wherein acquisition en each candidate signal instance is .letec^d cvith a received signal strength indicator (RSS1). 19. The method of claim 1, wherein acquisition on each candidate signal instance is detected using a frequency eiror estimator that estimates the amount of re-Jdiul frequency error in frequency -translated data samples for the candidate signal instance. 20. The method of claim 17, further comprising: perrbfi'nifig system acquisition on the acquired signal instance having a best dei en or ou:put ihai: exceeds the particular threshold value wichin the particular time iru.er/al. 21. The method of claim 20, further comprising: retaining acquisition information for each acquired signal instance for which system acquisition is nor performed. 22. The method of claim 17, further comprising: performing system acquisition on a plurality of acquired signal instances having dei:-e>r outputs exceeding the particular threshold value within the particular time inttTva,:. 23. The method of claim 22, further comprising; combining demodulated symbols for the plurality of acquired signal instances lor »vhich system acquisition is performed, 21 The method of claim 1, further comprising: acquiring a frequency of each of one or more additional candidate signal ins-tances based on a respective first frequency control loop. 25. The method of claim 24, wherein the second frequency control loop is operative to omit contributions from the first frequency control 'loop for each additional candidate signal instance during the acquisition of the signal instance by the first Lc&:uencv control loop. 26. The method of claim 24-, further comprising: decectms inquisition on at least one additional candidate signal instance, and tucking th:: average frequency of all acquired signal instances with the second ■;.re:.;nene> eonuol :oop. 27. The method of claim 1, wherein each first frequency control loop includes t rotaivr operative to frequency translate a signal instance. 2?. The method of claim 1, wherein the second frequency control ioop incudes an oscillator to wh:ch a downeonversion signal for the receiver! signal is lod;,;d. 2i\ Th:; method of claim 1, wherein the communication system is a CDMA t yii.'.trill, 3C The method of claim 29, v/hersin the CDMA system conforms to the IS-P5 or odma20liO standard. 3L The method of claim 297 wherein the CDMA system conforms to the W-C1MA or TS-CDMA standard. 32. A method of acquiring one or more pilots in a CDMA communication system, comprising; acq airing a frequency of each of one or more candidate signal instances with a reactive -first frequency control loop; detecting acquisition on at least one candidate signal instance; transferring, a frequency error of each acquired signal instance from the first frequency control loop to the second frequency control loop; tracking an average frequency of the at least one acquired signal instance with a se.;ond frec'.uency control loop; and tracking a residual frequency error of each acquired signal instance with the first frequency control lcop. 33. The method of claim 32, further comprising: accuirnn? a frequency of each of one or more additional candidate signal ir.;tr.ices based en -a. respective first frequency control loop; delecting" acquisition on &i least one additional candidate signal instance; and tracking the average frequency of all acquired signal instances with The second fn qoency controi loop. 34. In a wireless communication system^ a method of acquiring sijmal ■ir-;t;..ices in a ro-wed .signal, comprising: acquiring a frequency of each of one or more candidate signal instances; detecting frequency acquisition on at least one candidate signal instance based on a: least OT& d:-tec?or; perionnbg system acquisition on an acquired signal instance having a best detector output; and retaining frequency acquisition information for each acquired signal instance for vjhk'.\ system acquisition is not performed. 35. Ths method of claim 34, wherein frequent;;/ acquisition on a candidate signal instance if. detected if the detector output for the signal instance exceeds a particular threshold value within a particular time interval. 36. Th£ method of claim 34, wherein system acquisition is performed on a pkiiTality of acquired signal instances having detector outputs exceeding a particular ihr-ishold value within a particular Lime interval. 37. A receiver unit in a wireless communication system* comprising: one or mors finger processors operative to acquire frequency of one or more <:ai lidate signal: instances in a received signal.with one or more respective first .frequency control loops> at least oni- detector operative to detect acquisition on at least one candidate ;:iigf a] insiance, $iui a second frequency control loop operative to truck an average frequency of the at IVis-st one acquired signal instance. 33. The receiver arm of claim 37, wherein the one or moxe finger processors ;:re further opsiuria to tracx residual frequency error of each acquired signal instance villi the first fr=»"ju?ney control loop. 39. The recei vei unit of claim 37, further comprising: a ieuxc:,t:-j operative to ^arch for sirj:ii-ii instances in the received signal TO provide the oik; or more candidate signal instances. 40. 'live receiver unit of claim 37, wherein the each finger processor includes 41. Ths receiver unit of claim 37, wherein the second frequency control loop ];■; operative to adjust the frequency of an oscillator used as a reference to derive the :ve:]uency used for downeon version cf the received signal From radio frequency to baseband. 42. A terminal in a CDMA system comprising: one or more finger processors operative to acquire frequency of one cr more candidate signal instances in a received signal with onr, or more respective first frequency control loops; at least cms detector operative 1:0 detect acquisition on at least one candidate si2T.fi] instance; and a second frequency control loop operative to track an average frequency of the at leisi. one acquired signaJ instance. 43. The terminal of claim 42; wherein the one or more finger processors are funhar operative to track residual frequency error of each acquired signal instance with th;- first frequency control loop. 44. The terminal of claim 42, further comprising: a stsarchsjr operative to search for signal instanr.es in the received signal to provide the one armore candidate signal instances. 45. The :?rniinal of cbtrn 42, wherein the each finger processor includes a raravi,! operative 1:0 frequency translate a signal instance assigned to the finger pr^-ssor.

Documents:

0093-chenp-2004 abstract-duplicate.pdf

0093-chenp-2004 claims-duplicate.pdf

0093-chenp-2004 descripition(completed)-duplicate.pdf

0093-chenp-2004 drawings-duplicate.pdf

093-chenp-2004-claims.pdf

093-chenp-2004-correspondnece-others.pdf

093-chenp-2004-correspondnece-po.pdf

093-chenp-2004-description(complete).pdf

093-chenp-2004-drawings.pdf

093-chenp-2004-form 1.pdf

093-chenp-2004-form 13.pdf

093-chenp-2004-form 3.pdf

093-chenp-2004-form 5.pdf

093-chenp-2004-pct.pdf

93-chenp-2004 form-18.pdf

93-chenp-2004 form-3.pdf

93-chenp-2004 petitions.pdf

93-chenp-2004 power of attorney.pdf