DE102008053359A1 - Automatic-gain-control-system supporting method for maximum-ratio-combining receiver, involves switching off receiving path by high-frequency portion of baseband chip, when receiving quality of path falls below preset reference value - Google Patents
Automatic-gain-control-system supporting method for maximum-ratio-combining receiver, involves switching off receiving path by high-frequency portion of baseband chip, when receiving quality of path falls below preset reference value Download PDFInfo
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- DE102008053359A1 DE102008053359A1 DE200810053359 DE102008053359A DE102008053359A1 DE 102008053359 A1 DE102008053359 A1 DE 102008053359A1 DE 200810053359 DE200810053359 DE 200810053359 DE 102008053359 A DE102008053359 A DE 102008053359A DE 102008053359 A1 DE102008053359 A1 DE 102008053359A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
- H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Unterstützung eines Automatic-Gain-Control-Systems (AGC-Systems) gemäß dem Oberbegriff des einzigen Anspruchs.The The invention relates to a method for supporting an automatic gain control system (AGC system) according to the generic term the only claim.
Die Anwendung des Maximum-Ratio-Combining (MRC) bei Empfängern mit mehreren Empfangspfaden erfordert eine gleiche Verstärkungseinstellung bei allen Empfangspfaden, unabhängig des am einzelnen Empfangspfad anliegenden Signals. Anders gesprochen liegt in der AGC-Einheit für alle Empfangspfade der gleiche Verstärkungsfaktor vor.The Application of Maximum Ratio Combining (MRC) for receivers with multiple receive paths require an equal gain setting at all reception paths, independent of the signal present at the individual reception path. In other words lies in the AGC unit for all receive paths have the same gain factor.
Der Begriff Empfangspfad bezieht sich hierbei a) bei mehreren Empfangsantennen entweder auf einen einzelnen Antennenempfangspfad, das heißt, eine einzelne Empfangsantenne ist gleich ein einzelner Empfangspfad, oder b) bei einer einzigen Empfangsantenne und mindestens zwei Empfangspfaden, welche nur mit einer Empfangsantenne empfangen werden und welche in der Zeit oder in der Frequenz getrennt sind.Of the Term receive path refers to a) at several receiving antennas either to a single antenna receive path, that is, one single receive antenna is equal to a single receive path, or b) at a single receiving antenna and at least two receiving paths, which are received only with a receiving antenna and which are separated in time or in frequency.
Das Problem, welches hierbei Auftritt, ist, dass bei signifikant unterschiedlichen Empfangssignalen pro Empfangspfad (Fall a betreffend) bei unterschiedlich starken Empfangssignalen pro Antenne) der Verstärkungsfaktor pro Empfangspfad auf allen Empfangspfaden konstant gehalten werden muss, damit der schlecht empfangene Empfangspfad gegenüber einem gut empfangenen Signal nicht überproportional verstärkt wird, was bei einem MRC-Verfahren zu einer Rauschverstärkung führen würde.The Problem, which occurs here, is that at significantly different Receive signals per receive path (case a) with different strong reception signals per antenna) the amplification factor per reception path must be kept constant on all receiving paths so that the poorly received reception path compared to a well received signal not disproportionately reinforced which would lead to noise amplification in an MRC process.
Im Fall, dass nur ein Empfangspfad einen nennenswerten Signalbeitrag liefert und der andere Empfangspfad nicht, werden bei einem MRC-Empfänger alle Empfangspfade ausgewertet und verbrauchen somit unnötig Resourcen in Form von Rechenleistung und Strom.in the Case that only one receive path a significant signal contribution and the other receive path does not, all are at an MRC receiver Receiving paths evaluated and thus consume unnecessary resources in the form of computing power and power.
Aufgabe der vorliegenden Erfindung ist es, ausgehend von einem Verfahren der eingangs genannten Art, dieses in der Weise technisch zu verbessern, dass im Fall, dass nur ein Empfangspfad einen nennenswerten Signalbeitrag liefert und der andere Empfangspfad nicht, bei einem MRC-Empfänger keine unnötigen Resourcen in Form von Rechenleistung und Strom verbraucht werden.task The present invention is based on a method of the type mentioned at the outset to technically improve this in the manner that in the case that only one receive path is a significant signal contribution and the other receive path is not, with an MRC receiver none unnecessary Resources in the form of computing power and electricity are consumed.
Diese Aufgabe wird erfindungsgemäß durch ein Verfahren gelöst, das den im kennzeichnenden Teil des einzigen Anspruchs angegebenen Verfahrensschritt aufweist.These The object is achieved by a Solved the procedure, that indicated in the characterizing part of the single claim Having method step.
Danach wird ein Empfangspfad ausgeschaltet, wenn die Empfangsqualität dieses Empfangspfads einen vorgegebenen Schwellwert unterschreitet.After that A receive path is switched off if the reception quality of this Receive paths falls below a predetermined threshold.
Es wird in Abhängigkeit einer Funktion der Signalstärke im einzelnen Empfangspfad, zum Beispiel in Abhängigkeit des in englischer Sprache: radio signal strength indicator (RSSI) bei Unterschreiten eines zuvor festgelegten Schwellwertes der Empfangspfad im Hochfrequenz-Teil temporär abgeschaltet und in ein englischer Sprache: Idle-Pattern an das in englischer Sprache: Baseband übergeben. An Hand des Idle-Pattern kann das Baseband den nicht vorhandenen Beitrag des Pfades erkennen und entsprechend berücksichtigen.It becomes dependent a function of signal strength in individual reception path, for example, depending on the English Language: radio signal strength indicator (RSSI) when falling below a predetermined threshold, the receive path in the high-frequency part temporary switched off and in English: idle pattern to the in english: Pass baseband. On the basis of the idle pattern, the baseband can not be present Recognize the contribution of the path and take it into account accordingly.
Der besondere Vorteil ist, dass die Eigenschaften eines in englischer Sprache: Maximum-Ratio-Combiners sowohl im Normalbetrieb ausgenutzt werden können, das heißt, wenn die Signalanteile auf unterschiedlichen Empfangspfaden nicht signifikant unterschiedlich sind, als auch in einem Betrieb ausgenutzt werden können, in dem die Empfangssignale signifikant unterschiedlich sind, weil dann anhand einer Schwellwertfunktion ein Empfangspfad, das heißt eine Empfangs-Antenne und ein Hochfrequenz-Empfangspfad, und die korrespondierende Wei terverarbeitung im in englischer Sprache: Basisbandchip zur Stromverbrauchsreduzierung ausgeschaltet wird.Of the special advantage is that the properties of one in English Language: Maximum Ratio Combiners are exploited in both normal operation can, this means, if the signal components on different receiving paths are not are significantly different, as well as exploited in a company can be in which the received signals are significantly different, because then using a threshold function, a receive path, that is a Receive antenna and a high-frequency reception path, and the corresponding Further processing in English: Baseband chip for power consumption reduction is turned off.
Bei abgeschaltetem Empfangspfad wird vom Hochfrequenz-Teil zum Basisbandchip mittels eines zwischen Hochfrequenz-Teil und Baseband-Verarbeitungsteil übertragenen Idle-Pattern das Ausschalten mindestens eines Empfangspfads signalisiert beziehungsweise gesteuert.at turned off reception path is from the high-frequency part to the baseband chip by means of a transmitted between high-frequency part and baseband processing part Idle pattern signals the switching off of at least one receive path respectively controlled.
Diese Schwellwertfunktion beinhaltet insbesondere den Fall, dass das Nutzsignal pro Empfangssignal einer hohen Kanaldämpfung unterliegt und das zugehörige additive Rauschen beziehungsweise thermische Rauschen sehr hoch ist, so dass sich für den abzuschaltenden Empfangspfad ein sehr schlechtes Signal-Rausch-Verhältnis (englisch Signal-to-noise ratio, kurz SNR) in Relation zu dem gut empfangenen Empfangssignal ergibt.These Threshold function includes in particular the case that the useful signal subject to a high channel attenuation per received signal and the associated additive Noise or thermal noise is very high, so that for the disconnected receiving path a very poor signal-to-noise ratio (English Signal-to-noise ratio, SNR for short) in relation to the well-received Receive signal results.
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DE200810053359 DE102008053359A1 (en) | 2008-10-27 | 2008-10-27 | Automatic-gain-control-system supporting method for maximum-ratio-combining receiver, involves switching off receiving path by high-frequency portion of baseband chip, when receiving quality of path falls below preset reference value |
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DE200810053359 DE102008053359A1 (en) | 2008-10-27 | 2008-10-27 | Automatic-gain-control-system supporting method for maximum-ratio-combining receiver, involves switching off receiving path by high-frequency portion of baseband chip, when receiving quality of path falls below preset reference value |
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DE102008053359A1 true DE102008053359A1 (en) | 2010-04-29 |
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DE200810053359 Withdrawn DE102008053359A1 (en) | 2008-10-27 | 2008-10-27 | Automatic-gain-control-system supporting method for maximum-ratio-combining receiver, involves switching off receiving path by high-frequency portion of baseband chip, when receiving quality of path falls below preset reference value |
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US20050136856A1 (en) * | 2003-10-20 | 2005-06-23 | Bar-Giora Goldberg | Diverse antenna system |
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US20050136856A1 (en) * | 2003-10-20 | 2005-06-23 | Bar-Giora Goldberg | Diverse antenna system |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20110502 |