EP1080549A1 - Recepteur et procede de reception de communications sans fil - Google Patents

Recepteur et procede de reception de communications sans fil

Info

Publication number
EP1080549A1
EP1080549A1 EP99926406A EP99926406A EP1080549A1 EP 1080549 A1 EP1080549 A1 EP 1080549A1 EP 99926406 A EP99926406 A EP 99926406A EP 99926406 A EP99926406 A EP 99926406A EP 1080549 A1 EP1080549 A1 EP 1080549A1
Authority
EP
European Patent Office
Prior art keywords
frequency
signals
receiver
signal
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99926406A
Other languages
German (de)
English (en)
Inventor
Tapio Kuiri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Oyj
Original Assignee
Nokia Mobile Phones Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9811380.6A external-priority patent/GB9811380D0/en
Priority claimed from GBGB9828044.9A external-priority patent/GB9828044D0/en
Application filed by Nokia Mobile Phones Ltd filed Critical Nokia Mobile Phones Ltd
Publication of EP1080549A1 publication Critical patent/EP1080549A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04B7/12—Frequency diversity
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing
    • H03D7/165—Multiple-frequency-changing at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver

Definitions

  • the present invention relates to a receiver and receiving method for use in wireless communication.
  • the present invention relates to a receiver connectable to a main antenna and a diversity antenna.
  • the area covered by the network is divided into a plurality of cells each of which is served by a base transceiver station.
  • Each base station is arranged to communicate with a plurality of stations located in the cell associated with the base station. These stations are typically mobile telephones or other mobile stations.
  • CDMA Code division multiple access
  • IS- 95 is an example of a cellular standard using CDMA.
  • a plurality of users in a given cell will use the same frequency at the same time.
  • the users are distinguished by different spreading codes .
  • Different frequencies may by used in different cells.
  • CDMA systems use soft handoff .
  • soft handoff a mobile station is arranged in certain circumstances to communicate with more than one base station at the same time. The same information will be sent by the different base stations but a different spreading code and/or frequency may be used for the signals transmitted by the different base stations.
  • soft handoff will occur when a mobile station is close to the edge of the cell in which the mobile station is currently located.
  • a diversity receiver 1 which is known is shown in Figure 1.
  • the receiver 1 comprises a main antenna 2 connected to a first filter 6 which removes signals which fall outside the frequency range of the signals which could be received by the main antenna.
  • the output of the first filter 6 is input to a low noise amplifier 12, the output of , which is connected to a first mixer 14.
  • the first mixer 14 receives an input from a high frequency synthesizer 16 so that the output of the first mixer 14 represents the received signal at intermediate frequencies.
  • the output of the first mixer 16 is input to a second bandpass filter 18 which filters the output of the first mixer 16.
  • the second bandpass filter 18 has a much narrower bandwidth than the first bandpass filter 6 and filters out unwanted signals except the desired signal which is at the intermediate frequency to which the second bandpass filter is tuned.
  • the receiver of Figure 1 comprises a second antenna 30 which is physically spaced apart from the first antenna 2.
  • the second antenna 30 also receives signals and is connected to a third filter 32 which is tuned to the same frequency band as the first bandpass filter 6.
  • the output of the third filter 32 is connected to a second low noise amplifier 34, the output of which is connected to a second mixer 36.
  • the second mixer 36 has an input from a second high frequency synthesizer 38 so that the output of the second mixer 36 represents the received signal but at intermediate frequencies.
  • the output of the second mixer 36 is input to a fourth bandpass filter 22 which filters the output of the second mixer 38. In a similar manner to the second bandpass filter 18, the fourth bandpass filter 22 filters out all signals except the desired signal.
  • the second antenna 30 is used as a diversity antenna. For example, if the signal from the base station is not strongly received by one antenna, the signal from the base station may be strongly received by the other antenna and vice versa.
  • the signals received by the main antenna 2 and the diversity antenna 30 may be coherently combined using the maximum ratio combining technique, which gives a better performance, or, alternatively, the strongest signal selected.
  • the combining of the signals or the selection of the strongest signal is carried out by components of the receiver which are not shown in Figure 1.
  • the inventor has recognised that there is a problem with this known arrangement particularly if the desired signals are at different frequencies.
  • the intermediate frequencies to which the second and fourth bandpass filters are tuned are the same. This means that the identical components can be used downstream of each of the mixers and in the down conversion to the baseband or to another intermediate frequency the same oscillator can be used.
  • the inventor has appreciated that the use of a common intermediate frequency can lead to interference, particularly when the mixers and oscillators are all in close proximity.
  • the first oscillator 16 provides a signal at a first frequency and the second oscillator provides a signal at a second, different frequency. Leakage of signal from the first oscillator can occur to the second mixer and vice versa.
  • each of the first and second antennae will receive signals at more than one frequency.
  • the combined signal containing all of the signals received by the respective antenna will be passed to the respective mixer. All of these signals will be mixed with the signal from the associated local oscillator and will provide signals at different intermediate frequencies.
  • the bandpass filter is tuned to the intermediate frequency of the desired signal so that only the desired signal passes through the filter. The other signals at the other intermediate frequencies are filtered out.
  • the combined signal will be effectively mixed in each mixer with two different sets of oscillator signals.
  • two different signals may be at the intermediate frequency of the desired signal.
  • One of these signals is the desired signal which is obtained as described hereinbefore.
  • the other signal is initially at a different radio frequency to the desired signal but is at the same intermediate frequency due to having been mixed with the signal leaked from the other oscillator.
  • the two different signals which are at the intermediate frequency to which the respective bandpass filter is tuned interfere. This can be a particular problem when the desired signal is weak and the interfering signal is strong. It is an aim of embodiments of the present invention to provide a receiver which is able to avoid or at least reduce the problems of the known arrangement discussed hereinbefore.
  • a receiver comprising a first input for receiving a first signal; a first processing path coupled to the first input for processing said first signal; a second input for receiving a second signal at a second different frequency; and a second processing path coupled to said second input for processing said second signal, each of said first and second paths comprising means for changing the frequency of the first and second signal to different frequencies, wherein the first and second signals are changed to different frequencies and the first and second input means are arranged to receive the first and second signals at the same time.
  • the first and second frequencies are radio frequencies .
  • the first and second frequencies may be the same or different.
  • the first and second frequencies are preferably reduced by the changing means .
  • the changing means may increase the first and second frequencies.
  • Each of the changing means preferably comprises mixing means for mixing the respective one of the first and second signals with a respective frequency signal from respective frequency sources.
  • the frequency sources are preferably first and second oscillators. Typically, the frequencies provided by the first and second frequency sources will differ although in certain circumstances they might be the same.
  • At least one of the changing means of the first and second receiving paths be arranged to downconvert the frequency of the first and/or second signals to an intermediate frequency.
  • An intermediate frequency is less than the radio frequency of the received signal but higher than the baseband frequency.
  • both of the first and second signals are downconverted to intermediate frequencies.
  • One intermediate frequency is preferably an integral multiple of the other.
  • further changing means may be provided in each of the first and second processing paths for reducing the frequency of the signals at the intermediate frequency.
  • the further changing means may each comprise a mixer.
  • Each of the further changing means may receive a mixing frequency from a common frequency source. In this way, the number of oscillators required can be reduced.
  • the further changing means may receive frequencies from different frequency sources .
  • the further changing means are preferably arranged to reduce the intermediate frequencies to a baseband frequency. In those circumstances, the frequencies provided by the common frequency source or two further frequency sources will be the same as the respective intermediate frequencies.
  • a frequency divider is preferably provided for dividing the frequency from the common frequency source to provide the intermediate frequency of one of said frequency paths and the frequency of the common frequency source is the same as the frequency of the other intermediate frequency. In this way, it is possible to use a single common frequency source, thus reducing the number of frequency sources required.
  • one of the first and second paths reduces the frequency of the respective first or second signal to an intermediate frequency whilst the other of the first and second paths is arranged to directly downconvert the received respective first or second signal to a baseband frequency signal.
  • the first input is coupled to a first antenna and the second input is coupled to a second different antenna.
  • the receiver may have a second mode of operation in which the first and second input means from the first and second processing paths are arranged to receive first and second signals respectively, the first and second signals being at the same frequency and the changing means may be arranged in the second mode of operation to change the first and second frequencies to the same frequency.
  • the receiver is arranged to receive and process code division multiple access signals.
  • code division multiple access signals Preferably, any other suitable access method including time division multiple access, frequency division multiple access, space division multiple access, other spread spectrum methods and hybrids thereof.
  • the receiver is incorporated in a transceiver.
  • the receiver or transceiver is incorporated in a mobile station.
  • a receiver comprising a first receive arrangement comprising a first input for receiving a plurality of signals including a first desired signal and a first processing path coupled to said first input means for processing said plurality of signals; and a second receive arrangement comprising a second input for receiving the plurality of signals including a second desired signal at a second, different frequency and a second processing path coupled to the second input for processing the plurality of signals, each of said first and second paths comprises means for changing the frequencies of the signals received from the respective input so that in use the frequencies of the plurality of signals are changed to fall within first and second frequency ranges respectively, wherein the frequency changed first signal is outside said second frequency range and said frequency changed second signal is outside said first frequency range.
  • a receiving method comprising the steps of receiving a first signal; processing the first signal, said processing step comprising changing the frequency of the first signal to a different frequency; receiving a second signal; and processing the second signal, said processing step comprising changing the frequency of the second signal to a different frequency, wherein the first and second signals are changed to different frequencies .
  • Figure 1 shows a known diversity receiver
  • Figure 2 shows a schematic diagram of a part of a wireless telecommunication network in which embodiments of the present invention may by incorporated;
  • Figure 3 shows a schematic view of a transceiver embodying the present invention.
  • the network 102 comprises a plurality of cells 104 each of which is served by a respective base transceiver station 106.
  • Each base transceiver station 106 is arranged to send radio signals to and to receive signals from mobile stations 108 located in the cell 104 associated with the base station 106 as well as mobile stations 108 located in the edge regions of adjacent cells 104.
  • the transceiver 40 of Figure 3 has a main antenna 2 which is arranged to transmit and receive signals and a diversity antenna 30 which is arranged to receive signals.
  • the diversity antenna 30 does not transmit signals. However in alternative embodiments of the present invention, the diversity antenna may also transmit signals.
  • the main antenna 2 is connected to a first receive processing path 42 and to a transmit processing path 44.
  • the first receive processing path 42 will now be described.
  • the first receive path 42 has a first bandpass filter 6 which is connected to the main antenna 2.
  • the main antenna 2 receives a number of signals within a given radio frequency range .
  • the first bandpass filter 6 allows all of those signals within the given range to pass therethrough. Any noise or the like falling outside that range is filtered out by the first bandpass filter 6. Accordingly, the output of the first bandpass filter 6 will include the desired signal as well as unwanted signals at other frequencies .
  • the output of the first bandpass filter 6 is input to a first amplifier 12 which amplifies the received signals.
  • the output of the first amplifier 12 is input to a second bandpass filter 46 which removes any noise signals or the like introduced by the first amplifier 12 which fall outside the given range.
  • the output of the second bandpass filter 46 is input to a first mixer 14.
  • the first mixer also receives an input from a first local oscillator 16 which provides a signal at a first frequency FI .
  • the first mixer 14 mixes the outputs of the second bandpass filter 46 with the output of the first local oscillator 16. Signals which are received by the antenna 2 and pass through the first and second bandpass filters 6 and 46 are at a radio frequency. By mixing the output of the second bandpass filter 46 with the output of the first local oscillator 16, the received signals are reduced to an intermediate frequency.
  • the output of the first mixer 14 is connected to the input of a third bandpass filter 18.
  • the third bandpass filter 18 is tuned to the intermediate frequency of the desired signal .
  • the third bandpass filter 18 has a much narrower bandwidth than the first and second bandpass filters 6 and 46. Accordingly, only the signal which is at the desired intermediate frequency is output by the third bandpass filter 18. The signals at the other intermediate frequencies are removed by the third bandpass filter 18.
  • the output of the third bandpass filter is input to a first mixing arrangement 48.
  • the mixing arrangement 48 is shown as having two separate mixers. One mixer provides the I baseband component of the desired signal whilst the other mixer provides the Q baseband component of the desired signal.
  • the first mixing arrangement 48 receives an input from a second oscillator 50 which provides a signal at the intermediate frequency to which the third bandpass filter 18 is tuned. The first mixer arrangement 48 thus mixes the desired signal at the intermediate frequency from the third bandpass filter 18 with a signal having the intermediate frequency. The output of the first mixing arrangement 48 therefore provides the desired signals at the baseband frequency.
  • I and Q signals at the base band frequency are input to a second mixing arrangement 52.
  • the second mixing arrangement 52 also receives an input from a further local oscillator 70.
  • the signal received from the local oscillator 50 is at the intermediate frequency, for example 570MHz.
  • the output of the second mixing arrangement 52 is input to a second amplifier 54 which amplifies the output of the second mixing arrangement 52.
  • the output of the second amplifier 54 is input to a fourth bandpass filter 56 which removes any noise introduced by the second amplifier 54.
  • the fourth amplifier will have a bandwidth similar to that of the third bandpass filter.
  • the output of the fourth bandpass filter 56 is input to a second mixer 58.
  • the second mixer 58 also receives an input from the first local oscillator 16.
  • the output of the fourth bandpass filter 56 is thus mixed by the second mixer 58 with the output from the first local oscillator 16 to provide a signal at the radio frequency.
  • the signal will be in the range 1920-1980MHZ.
  • the output of the second mixer 58 is input to a fifth bandpass filter 60 which removes any noise introduced by the second mixer 58.
  • the fifth bandpass filter 60 has a bandwidth similar to that of the third bandpass filter 18.
  • the output of the fifth bandpass filter 60 is input to an amplifying arrangement 62 which amplifies the signals for transmission.
  • the output of the amplifying arrangement 62 is input to a sixth bandpass filter 64 which removes any noise introduced by the amplifying arrangement 62.
  • the output of the sixth bandpass filter is connected to the antenna 2 so that the signals can be transmitted. It should be appreciated that in practice the first and sixth bandpass filters 6 and 64 will define a duplex filter.
  • the diversity antenna 30 is connected to a second receive processing path 66.
  • the second receive processing path 66 contains similar components to the first receive processing path 42.
  • the diversity antenna 30 is also arranged to receive a number of signals within a given radio frequency range. It should be appreciated that the given radio frequency range may be the same as or different to that of the main antenna 2.
  • the output of the diversity antenna 30 is connected to a seventh bandpass filter 32 which filters out any signals falling outside the given radio frequency range .
  • the output of the seventh bandpass filter 32 is connected to the input of a third amplifier 34 which amplifies the received signal.
  • the output of the third amplifier 34 is connected to the input of an eighth bandpass filter 68 which filters out noise introduced by the third amplifier 34.
  • the output of the eighth bandpass filter 68 is connected to the input of a third mixer 36.
  • the third mixer 36 receives a signal from a third local oscillator 38.
  • the output of the eighth bandpass filter 68 is mixed with the output of the third local oscillator 38 by the third mixer 36 to provide signals at intermediate frequencies.
  • the output of the third mixer 36 is input to a ninth bandpass filter 22 which is tuned to the intermediate frequency of the desired signal, in a similar way to the third bandpass filter 18 of the first received processing path.
  • the output of the ninth bandpass filter 22 thus provides the desired signal at the intermediate frequency to which that bandpass filter is tuned.
  • the other undesired signals which are received at the same time are filtered out by the ninth bandpass filter 22.
  • the output of the ninth bandpass filter 22 is connected to the input of a third mixing arrangement 70 which mixes the desired signal at the intermediate frequency with a signal received from a frequency divider 72.
  • the frequency divider 72 receives the signal from the second local oscillator 50 and divides it by a factor of n to provide a signal which is at the same intermediate frequency of the signal which is output by the ninth bandpass filter 22.
  • n may, but not necessarily be an integer.
  • the third mixing arrangement 70 thus provides I and Q signals at the baseband frequency.
  • the main antenna is arranged to receive signals within the range 2110-2170MHz and the first bandpass filter 6 is tuned to this range.
  • the first local oscillator is arranged to provide signals at a frequency falling within the range 2490-2550MHz .
  • the frequency of the first local oscillator 16 is selected so that the desired signal is always output from the first mixer 14 at the same intermediate frequency, regardless of the radio frequency of the desired signal.
  • the desired signal output of the first mixer 14 will be at 380MHz. Accordingly, this is the frequency to which the third bandpass filter 18 is tuned.
  • the diversity antenna is arranged to receive signals falling within the range 2110-2170MHz and the third local oscillator 38 is arranged to provide signals within the range 2205-2265 MHz. Accordingly, the desired signal output by the third mixer 36 will be at the intermediate frequency of 95MHz.
  • 95MHz is the frequency to which the ninth bandpass filter 22 is tuned.
  • the third local oscillator could alternatively provide frequencies in the range of 2015-2075 MHz to provide an intermediate frequency of 95MHz.
  • the second local oscillator 50 is thus arranged to provide a frequency of 380MHz.
  • the 380MHz output of the second local oscillator 50 is input to the first mixing arrangement 48 to provide a baseband signal.
  • the intermediate frequencies of the desired signals output by the first and third mixers 14 and 36 respectively are quite different. In this way, the problems of the prior art can be avoided.
  • the first and third mixing arrangements 48 and 70 receive an input from a common local oscillator.
  • separate local oscillators can be provided for the first and third mixing arrangements.
  • the main antenna 2 will also receive a signal falling outside the range 2110-2170MHz and these signals are eventually filtered out by the third bandpass filter 18.
  • the diversity antenna 30 will also receive signals falling outside the range 2110-2170MHZ and those signals are eventually filtered out by the ninth bandpass filter 22.
  • the frequency of the signals provided by the first and third oscillators 16 and 38 should be carefully selected so that when the output of the third oscillator 38 is mixed with the signals output by the second bandpass filter 46, none of those signals are at the intermediate frequency of the desired signal, i.e. the frequency to which the third bandpass filter 18 is tuned.
  • the output of the eighth bandpass filter 68 is mixed with the output of the first oscillator 16, it should be ensured that none of the signals are at the intermediate frequency of the desired signal i.e. the frequency to which the ninth bandpass filter 22 is tuned.
  • embodiments of the present invention may also be advantageous from the point of view of the transmit side.
  • the second mixer 58 receives leakage signals from the third oscillator 38
  • the results of the mixing of the output of the fourth bandpass filter 56 with the leakage signals from the third oscillator should fall outside the bandwidth of the fifth bandpass filter 60.
  • the leakage signal would fall within the bandwidth of filter 60.
  • a single intermediate frequency step is used in each of the received processing paths 42 and 66.
  • two or more intermediate frequencies may be used. Accordingly, the _ radio frequency is reduced to a first intermediate frequency and then to a second lower intermediate frequency before being downconverted to the baseband frequency.
  • the desired signals received by the two different antennae are at different frequencies. However, the desired signals may be at the same frequency. However, the respective intermediate frequencies would be different.
  • the two receive paths are arranged to receive the signals from one base station.
  • the first and second signals from the respective antennae may be downconverted to the same or different frequencies.
  • the first and third oscillators would provide the same frequency and the divider connected to the second oscillator would be bypassed.
  • the frequency provided by the first and third oscillators can be varied.
  • the second oscillator is not required to be variable.
  • the second oscillator may be variable.
  • Embodiments of the present invention can also be used in situations where the main channel is used for communication with a base station whilst the diversity antenna is used to monitor the strength of signals from neighbouring base stations to assist in the making of hand-off decisions. With this arrangement, it is not necessary to interrupt the signal received in the main channel .
  • the two antenna may not receive signals at the same time so that at any given time, only one receive path is active.
  • the signal received from one antenna is converted to an intermediate frequency and then to a baseband frequency whilst the signal received by the other antenna is directly converted to the baseband frequency. In other words, with the signal received by the other antenna there is no conversion to an intermediate frequency.
  • embodiments of the present invention has been described in the context of a receiver having two antennae. It should be appreciated that embodiments of the present invention may incorporate more than two antennae. The receiver could then use a different intermediate frequency for the signals received from the respective antennae. Alternatively, the same intermediate frequency can be used more than once but not in receive paths which are physically adjacent.
  • Embodiments of the present invention are applicable to any arrangement where at least two signals at different frequencies are arranged to be received by at least two different antenna and the processing paths are close enough that interference between the paths might arise .
  • embodiments of the present invention have been described in the context of a CDMA system, embodiments of the present invention are also applicable to other types of spread spectrum techniques .
  • Embodiments of the present invention may also be used in systems which use time division multiple access (TDMA) , frequency division multiple access (FDMA) , space division multiple access (SDMA) or hybrids of any of the access systems discussed.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • SDMA space division multiple access
  • Embodiments of the present invention can also be included in devices other than mobile stations.
  • base stations or fixed stations may incorporate the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radio Transmission System (AREA)

Abstract

On décrit un récepteur et un procédé d'utilisation dudit récepteur. Le récepteur comprend une première borne d'entrée pour recevoir un premier signal, une première voie de traitement couplée à la première borne d'entrée pour traiter ledit premier signal, une deuxième borne d'entrée pour recevoir un deuxième signal à une deuxième fréquence différente, et une deuxième voie de traitement couplée à la deuxième borne d'entrée pour traiter ledit deuxième signal. Chacune desdites première et deuxième voies inclut un moyen pour changer la fréquence desdits premier et deuxième signaux et leur conférer des fréquences différentes. Les première et deuxième bornes d'entrée sont arrangés de manière à recevoir les premier et deuxième signaux en même temps.
EP99926406A 1998-05-27 1999-05-25 Recepteur et procede de reception de communications sans fil Withdrawn EP1080549A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB9811380.6A GB9811380D0 (en) 1998-05-27 1998-05-27 A transciever for wireless communication
GB9811380 1998-05-27
GB9828044 1998-12-18
GBGB9828044.9A GB9828044D0 (en) 1998-12-18 1998-12-18 A receiver and receiving method for wireless communication
PCT/EP1999/003597 WO1999062199A1 (fr) 1998-05-27 1999-05-25 Recepteur et procede de reception de communications sans fil

Publications (1)

Publication Number Publication Date
EP1080549A1 true EP1080549A1 (fr) 2001-03-07

Family

ID=26313748

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99926406A Withdrawn EP1080549A1 (fr) 1998-05-27 1999-05-25 Recepteur et procede de reception de communications sans fil

Country Status (4)

Country Link
EP (1) EP1080549A1 (fr)
JP (1) JP2002517124A (fr)
AU (1) AU4367899A (fr)
WO (1) WO1999062199A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009044446A (ja) * 2007-08-08 2009-02-26 Sanyo Electric Co Ltd 受信装置
CN106301516B (zh) 2016-08-08 2020-07-21 华为技术有限公司 一种分集接收机及终端

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI76227C (fi) * 1986-11-18 1988-09-09 Nokia Mobira Oy Koppling foer aotergivningsdelen i en foer ett telefonsystem avsedd fm-mottagare.
DE3779638T2 (de) * 1987-09-03 1993-01-21 Philips Nv Empfaenger mit parallelen signalstrecken.
JPH05102899A (ja) * 1991-08-16 1993-04-23 Shiyoudenriyoku Kosoku Tsushin Kenkyusho:Kk 多周波通信方式
US5579341A (en) * 1994-12-29 1996-11-26 Motorola, Inc. Multi-channel digital transceiver and method
FI951918A (fi) * 1995-04-21 1996-10-22 Nokia Mobile Phones Ltd Lähetin-vastaanotinlaite ja menetelmä kompleksien I/Q-signaalin synnyttämiseksi ja käsittelemiseksi
CA2190545A1 (fr) * 1995-12-26 1997-06-27 Mihai Banu Architecture de systeme et methode de traitement de signaux recus via un trajet donne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9962199A1 *

Also Published As

Publication number Publication date
JP2002517124A (ja) 2002-06-11
WO1999062199A1 (fr) 1999-12-02
AU4367899A (en) 1999-12-13

Similar Documents

Publication Publication Date Title
EP0966115B1 (fr) Emetteur-récepteur pour un réseau de communication sans fil
US5881369A (en) Dual mode transceiver
US6643522B1 (en) Method and apparatus providing simultaneous dual mode operations for radios in the shared spectrum
EP1708372B1 (fr) Circuit intégré pour un émetteur-récepteur de conversion directe multibande
EP1708371B1 (fr) Circuit intégré à entrées multiples et à sorties multiples pour un émetteur-récepteur multibande
ES2202377T3 (es) Radio con la capacidad de comunicarse simultaneamente sobre mas de una frecuencia.
US6256511B1 (en) Dual-mode radio architecture
CA2504248A1 (fr) Systemes et procedes d'augmentation de la capacite et/ou de la qualite du service de systemes satellites et cellulaires terrestres au moyen de la reception terrestre de frequencesde bandes satellites
US6374093B1 (en) Shifting of frequency range and bandwidth of receivers using a mixer attenuating the image frequency
CA2817195A1 (fr) Station de base bimode
US7536163B2 (en) Apparatus and method generating multi RF tone signals in UWB communication system
US20090275357A1 (en) Wireless receiver, wireless transceiver including the same and mobile terminal
KR100453501B1 (ko) 이동 통신망에서 대역 변환 중계 장치 및 방법
EP1111821B1 (fr) Dispositif de combinaison dans un système sans fil et son procédé
US6628960B1 (en) Multi-mode radio receiver
EP1080549A1 (fr) Recepteur et procede de reception de communications sans fil
EP1207627B1 (fr) Une architecture d'émetteur-récepteur radio efficace pour GSM/DCS/UMTS (UTRA/FDD)
US6829469B1 (en) Method and a device for producing a signal
US10790563B1 (en) Reconfigurable phase-shifting networks
KR20010060268A (ko) 전자기 신호용 송신/수신 장치, 송신/수신 셀, 송신/수신국 및 주파수 호핑 방법
US20080304466A1 (en) Wireless multipoint voice network
GB2344724A (en) Transceiver operable in two frequency bands
MXPA97004997A (es) Transceptor de modo dual

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20001030

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE ES FR IT LI NL

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NOKIA CORPORATION

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 20020606