Showing papers by "Aarno Parssinen published in 2012"

Wideband 2 to 6 GHz RF Front-End With Blocker Filtering

Abstract: This paper presents a wideband blocker filtering technique for an RF front-end. A wideband LNA and a transferred impedance filter are implemented as part of a receiver to demonstrate the feasibility of the system. The transferred impedance filter includes an adjustable polyphase filter to compensate for the phase shift in the system in order to maintain correct operating frequency. The transferred impedance filter with passive mixers and the wideband LNA are analyzed by means of frequency transformation to demonstrate the different design trade-offs. The front-end achieves a gain of 43 and 41 dB and a noise figure of 3.2 and 5.7 dB with an IIP3 of -13 and -5 dBm with the transferred-impedance filter turned off and on, respectively. An added selectivity of 6 dB is achieved by using the solutions described in this paper.

Receiver for non contiguous carrier aggregation schemes

Abstract: Data is received that has been transmitted via a combination of radio frequency signals using carrier aggregation, each radio frequency signal occupying a respective radio frequency band, the bands being arranged in two groups separated in frequency by a first frequency region, the first of the two groups occupying a wider frequency region than the second group. The radio frequency signals are down converted using quadrature mixing (906a, 906b, 906c, 906d) to give in phase and quadrature components, and the in phase and quadrature components are filtered using a first bandpass filter bandwidth (902a, 902b) to give first bandpass filtered in phase and quadrature components and filtered using a second bandpass filter bandwidth (904a, 904b), different from the first bandpass filter bandwidth, to give second bandpass filtered in phase and quadrature components. A reconfigurable receiver is configurable to a first mode to receive the combination of radio frequency signals, and is also configurable to at least a second mode. At least one first filter is configured, in the first mode, to use a first bandpass filter bandwidth (902a, 902b) and, in the second mode, to use a low pass filter bandwidth (900a, 900b). At least one second filter is configured, in the first mode, to use a second bandpass filter bandwidth (904a, 904b), different from the first bandpass filter bandwidth (902a, 902b).

Method of receiving data transmitted using carrier aggregation corresponding receiver

Abstract: A receiver uses a local oscillator to receive data transmitted via a combination of radio frequency signals using carrier aggregation. Each radio frequency signal occupies a respective radio frequency band and the radio frequency bands (504, 502, 524) are arranged in two groups, a first group (534) and a second group (532), separated in frequency by a first frequency region, each of the groups including one or more radio frequency bands and the first group occupying a wider frequency region than the second group. The radio frequency signals are processed using the local oscillator by setting the local oscillator, during the processing, to a frequency (506) that is offset from the centre of a band defined by outer edges of the frequency regions occupied by the two groups.

Direct conversion receiver for contiguous carrier aggregation schemes

Abstract: Embodiments provide a receiver and a method for receiving data transmitted via a combination of a first signal modulated at a first carrier frequency, and a second signal modulated at a second carrier frequency, different to the first carrier frequency. In one embodiment the receiver comprises a local oscillator and is configured to adaptively configure the local oscillator to operate at a first local oscillator frequency and a second local oscillator frequency, different to the first frequency, in dependence on a signal strength of the first signal relative to a signal strength of the second signal.

Récepteur pour mécanismes d'agrégation de porteuses non contiguës

Abstract: Des donnees sont recues, lesquelles ont ete emises par une combinaison de signaux de radiofrequences utilisant l'agregation de porteuses, chaque signal de radiofrequences occupant une bande de radiofrequences respective, les bandes etant agencees en deux groupes separes en frequence par une premiere region de frequences, le premier des deux groupes occupant une region de frequences plus large que le second groupe. Les signaux de radiofrequences sont abaisses par un melange en quadrature (906a, 906b, 906c, 906d) pour donner des composantes en phase et en quadrature et les composantes en phase et en quadrature sont filtrees a l'aide d'une premiere largeur de bande de filtre passe-bande (902a, 902b) pour donner des composantes en phase et en quadrature avec une premiere bande passante, et a l'aide d'une seconde largeur de bande de filtre passe-bande (904a, 904b), differente de la premiere largeur de bande de filtre passe-bande, pour donner des composantes en phase et en quadrature avec une seconde bande passante. Un recepteur reconfigurable peut etre configure dans un premier mode pour recevoir la combinaison de signaux de radiofrequences et peut egalement etre configure dans au moins un second mode. Au moins un premier filtre est configure dans le premier mode pour utiliser une premiere largeur de bande de filtre passe-bande (902a, 902b) et dans un second mode une largeur de bande de filtre passe-bande basse (900a, 900b). Au moins un second filtre est configure dans le premier mode pour utiliser une seconde largeur de bande de filtre passe-bande (904a, 904b), differente de la premiere largeur de bande de filtre passe-bande (902a, 902b).