WO1997032403A1 - Dual-mode radio receiver for receiving narrowband and wideband signals - Google Patents
Dual-mode radio receiver for receiving narrowband and wideband signals Download PDFInfo
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- WO1997032403A1 WO1997032403A1 PCT/US1996/003069 US9603069W WO9732403A1 WO 1997032403 A1 WO1997032403 A1 WO 1997032403A1 US 9603069 W US9603069 W US 9603069W WO 9732403 A1 WO9732403 A1 WO 9732403A1
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- 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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/24—Automatic control in frequency-selective amplifiers
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- 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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
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- 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
- H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- 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
- H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
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- 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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
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- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
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- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
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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
- H04B7/12—Frequency diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
- H04B7/2646—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for broadband transmission
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- 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
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
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- 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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B2001/1054—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal by changing bandwidth
Definitions
- the invention generally relates to radio receivers for operating in radio communication systems and more specifically to dual-mode radio receivers for receiving narrowband and wideband signals.
- Cellular communication systems can be based on a variety of different cellular standards employing Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), and combinations of FDMA and TDMA. These cellular communication systems use frequency modulation to transmit speech and data information on a variety of different radio channel frequencies.
- the channel spacing between the different radio channel frequencies used in a cellular communication system varies depending on the cellular standard employed. Wideband cellular standards such as IS-95 and GSM require wide channel spacing to receive wideband frequency- modulated signals ("wideband signals"), while narrowband cellular standards such as NAMPS and the IS-54 standard require a narrower channel spacing to receive narrowband frequency- modulated signals ("narrowband signals").
- Prior art cellular radios having dual-mode receivers have been designed to operate in cellular communication systems employing either a narrowband standard or a wideband standard, for example, IS-95 dual-mode phones, or the dual-mode satellite/cellular phone described in U.S. patent application Serial No. 08/305,780, filed September 14, 1994, and entitled “Dual-Mode Frequency Synthesizer for Satellite/Cellular Phones, " which is incorporated herein by reference.
- These prior art dual-mode receivers are capable of demodulating both wideband signals and narrowband signals.
- the dual-mode receivers of the prior art use duplicate receiver components.
- prior art dual-mode receivers use a wideband filter apparatus to filter the received wideband signals and a different narrowband filter apparatus to filter the narrowband signals.
- the duplication of receiver components in a dual-mode receiver increases the size and cost of the cellular radio.
- a dual-mode receiver is needed that reduces the duplication required to demodulate both wideband and narrowband signals.
- the present invention provides an improved dual-mode radio receiver operating in a radio communication system that uses either wideband or narrowband signals.
- the radio receiver demodulates wideband and narrowband signals with reduced duplication of receiver components.
- the radio receiver has a wideband mode (e.g., the GSM or IS-95 standard) for demodulating wideband signals and a narrowband mode (e.g., the IS-54 or INMARSAT-M satellite communications standard) for demodulating narrowband signals.
- a wideband filter apparatus adapted for a wideband mode and having a wide filter bandwidth is provided for filtering radio signals containing alternatively wideband signals and narrowband signals. When in the wideband mode, the wideband filter apparatus receives radio signals and extracts wideband signals. The extracted wideband signals are demodulated by well-known methods.
- the wide bandwidth filter apparatus When in the narrowband mode, receives radio signals containing narrowband signals and generates filtered signals which contain the narrowband signals in subbands of the wide filter bandwidth.
- the filtered signals are digitized and processed with a digital filter.
- the digital filter has a narrow filter bandwidth adapted to the narrowband signals and separates the desired narrowband signals by filtering out unwanted flanking signals.
- the radio receiver is adapted to perform the extraction of narrowband signals existing in off-center subbands of the wide filter bandwidth. Furthermore the radio receiver can be adapted to jointly extract two or more different narrowband signals that are at different radio channel frequencies and that are located in different subbands of the wide filter bandwidth.
- the extraction of different narrowband signals lying in off-center subbands of the wide filter bandwidth is an important useful feature of the invention claimed herein. In the parent application, the invention was described to receive narrowband signals lying nominally in the center of the wide filter bandwidth with the undesired flanking signals flanking the desired narrowband signals.
- Logpolar signal processing is the preferred digital processing method for processing the wide bandwidth filtered signal in order to allow for more efficient separation of desired narrowband signal from flanking signals.
- Logpolar signal processing is disclosed in U.S. Patent No. 5,048,059, issued on September 10, 1991, and entitled “Log-Polar Signal Processing,” and is incorporated in the present application by reference.
- Logpolar signal processing is a preferred method of digitizing the wide bandwidth filtered signal which avoids the complication of Automatic Gain Control (AGC).
- AGC Automatic Gain Control
- the extracted narrowband signals are then combined to provide diversity reception for improved signal decoding.
- the different narrowband signals are transmitted from two different orbiting satellites to create path diversity and enhance probability of receiving good signal quality.
- Another object of the present invention is to provide a radio receiver that uses logpolar processing in extracting narrowband signals existing in off-center subbands of a wide filter bandwidth.
- Another object of the present invention is to provide a radio receiver that uses logpolar processing in extracting two or more different narrowband signals that are located in different subbands of a wide filter bandwidth and to then combine the extracted narrowband signals to provide diversity reception.
- Figure 1 is a block diagram showing the dual-mode radio receiver in accordance with the present invention employed in a radio communication system.
- FIG. 2 is a block diagram of the dual-mode radio receiver in accordance with the present invention.
- FIG. 3 is a schematic diagram depicting the processing of digital signals in accordance with the present invention.
- the dual-mode radio receiver 2 of the present invention is shown implemented in a cellular radio 3 having a transmitter 4 and transmit/receive (T/R) coupler 5.
- the radio receiver 2 has a wideband mode and a narrowband mode designed to enable radio 3 to receive radio signals containing wideband frequency-modulated signals ("wideband signals”) and narrowband frequency-modulated signals (“narrowband signals").
- the narrowband signals can be continuous transmissions in a frequency division multiple access system (FDMA) or time division multiple access transmissions (TDMA).
- FDMA frequency division multiple access system
- TDMA time division multiple access transmissions
- An example of a narrowband TDMA system is the U.S. Digital cellular system conforming to the telecommunications Industry Association standard IS-54. This standard is incorporated by reference as an example of narrowband TDMA waveforms and protocols.
- the wideband signals can for example conform to the European digital cellular standard known as GSM.
- GSM European digital cellular standard
- the GSM standard is publicly available under that name and is hereby incorporated by reference in its entirety as an example of wideband TDMA waveforms and protocols.
- the wideband mode may conform to the Code Division Multiple Access system described in TIA standard IS-95, which is also incorporated by reference herein.
- the base station wideband transceiver 6 is land-based and the base station narrowband transceiver 7a, 7b are contained in different orbiting satellite relay stations and their associated ground stations, where the different satellite relay stations illuminate the same area on the earth.
- the transmitters 7a, 7b each transmit a narrowband signal which contains the same speech or data information on two different but nearby frequency channels.
- suitable satellite configurations can be used to relay signals from the satellites to an earth station connected to a public switched telephone network.
- the above-identified U.S. patent application Serial No. 08/179,953 is hereby incorporated by reference in its entirety.
- the radio receiver 2 is particularly designed to receive either wideband signals from the wideband transceiver 6 or narrowband signals from the narrowband transceivers 7a, 7b. As discussed in detail below, the receiver 2 has a wide filter bandwidth adapted to the wideband mode which filters received radio signals when the receiver 2 is in either the narrowband or wideband mode. In the preferred embodiment, the radio receiver 2 when operating in the narrowband mode extracts the narrowband signals from the filtered radio signals through digital processing and combines the extracted narrowband signals to provide for diversity combination.
- the radio receiver 2 of the present invention for implementing both wideband and narrowband modes is shown in more detail.
- the radio receiver 2 includes a duplex filter 10 for providing the transmit/receive (T/R) coupling needed to connect the receiver 2 and the transmitter 4 to the same antenna in the event that the transmitter 4 and receiver 2 must operate at the same time (Frequency Division Duplex).
- a T/R coupler 5 can also be implemented with a T/R switch in the event that a Time Division Duplex system is required.
- the duplex filter 10 receives radio signals that may include wideband or narrowband signals transmitted from the base station transceivers 6, 7a, 7b.
- the received radio signals are outputted by duplex filter 10 to low noise amplifier 20.
- the received radio signals are outputted to a downconverter 25 which can comprise an image reject filter 30, mixer 40 and local oscillator 41.
- the downconverter 25 converts the received radio signals to a suitable first intermediate frequency (IF) or first downconverted signal and outputs the first downconverted signal to a wideband filter 100.
- IF intermediate frequency
- the wideband filter 100 is adapted to the wideband signals transmitted by wideband transceiver 6 and restricts the signal bandwidth of the received radio signals in accordance with the bandwidth of the wideband signals.
- the filtered signal is outputted to an intermediate frequency (IF) amplifier circuit 120 and additional wideband filters 110 that are adapted for the wideband signals.
- the wideband filters 100, 110 form a wideband filter apparatus 115 that establishes a wide signal pass bandwidth ("wide filter bandwidth") for the receiver 2.
- the wide filter bandwidth of the wideband filter apparatus 115 is adapted to filter the received radio signal so as to provide a filtered signal having a wide bandwidth adapted to the wideband signal.
- Amplifier circuit 120 includes a logarithmic amplifier-detector chain (amplifiers 60) and a second downconverter 45.
- the amplifier circuit 120 produces an analog output including a Radio Signal Strength Indication (RSSI) and a hardlimited signal.
- RSSI is an analog voltage approximately proportional to the logarithm of the instantaneous amplitude of the radio signals + noise.
- the final amplifier 60 in the amplifier circuit 120 produces the analog hardlimited signal from which a representation of instantaneous phase angle of the radio signals -(-noise can be extracted.
- the filtered signals from the amplifier circuit 120 are processed differently by the receiver 2 depending on whether the receiver 2 is in the narrowband mode or the wideband mode.
- the filtered signals are inputted into digitizer 125 as shown in Figure 2.
- the digitizer 125 converts the filtered signals to digital signals with the aid of sampling and digitizing where the bandwidth and sampling rates of digitizer 125 are adapted to the wideband mode.
- the digital signals form a complex number stream, as shown in Figure 3, and are inputted to a wideband demodulator 314 which decodes the digital signals to recover speech and data information conveyed by the wideband signal.
- the filtered signals can be fed directly to the wideband demodulator 314 from wideband filter 100 for demodulation, as shown by the dotted lines in Figures 2 and 3.
- Various techniques for demodulating the filtered signals when receiver 2 is in the wideband mode can be used and are well-known in the prior art.
- the filtered signals from the amplifier circuit 120 are inputted into digitizer 125.
- the digitizer 125 includes a phase digitizer 130 and RSSI A-to-D converter 140.
- the phase digitizer 130 converts the hardlimited signals of the filtered signals to fixed-point phase words.
- the RSSI A-to-D converter 140 simultaneously produces RSSI amplitude words which are digital representations of the logamplitude signals of the filtered signals.
- the RSSI amplitude words and the phase words form logpolar digital signals which are the logpolar representations of the instantaneous radio signals + noise value inputted into the digitizer 125.
- logpolar signal processing involves generating a fixed-point, modulo-2Pi digital representation of instantaneous phase information, which can for example be performed by a direct phase digitizing circuit such as described in U.S. Patent No. 5,084,669, issued on January 28, 1992, and entitled “Direct Phase Digitization,” or U.S. Patent No. 5,148,373, issued on September 15, 1992, and entitled "Method and Arrangement for Accurate Digital
- the filtered signals are converted to logpolar digital signals by digitizer 125 so that logpolar signal processing of the radio signals can be performed.
- Logpolar signal processing enables the desired narrowband signals contained in the radio signals to be more efficiently extracted.
- Logpolar signal processing comprises adjusting signal amplitude and frequency of logpolar digital signals. Through logpolar signal processing, the amplitudes of the digital signals can be adjusted into a convenient range by addition of scaling factors to RSSI values.
- the signal frequencies of logpolar digital signals can also be adjusted to remove errors by modulo addition of incrementing or decrementing phase values to the phase values of the logpolar digital signals. These operations are more conveniently performed in the logpolar domain. In particular, scaling, which normally requires the more complex multiplication operation, becomes simply fixed point addition subtraction in the logamplitude domain. Frequency shifting, which normally requires complex multiplications in the Cartesian (X+jY or I,Q domain), requires only fixed point modulo additions in the phase domain.
- the configuration of digital signal processor 150 for providing logpolar processing and other processing of the digital signals, which includes one or more narrowband signals originally transmitted from transceivers 7a, 7b, is shown in Figure 3.
- the logpolar digital signals from digitizer 125 are first processed by a frequency shifter 300.
- the frequency shifter 300 is used to provide for more effective and efficient extraction of narrowband signals lying in off-center subbands of the wide filter bandwidth of wide filter apparatus 115. Because the wide filter apparatus 115 of the receiver 2 is adapted for the wideband mode, narrowband signals received by radio 2 may not be centrally located in the wide filter bandwidth. Instead, the narrowband signals could be located in various off-center subbands within the wide filter bandwidth.
- the digital frequency shifter 300 functions to frequency shift the digital signal so that the desired narrowband signals located in one or more off-set subbands are shifted to the center of the wide filter bandwidth.
- the narrowband signals are shifted to the center by adding or subtracting suitable phase slopes to the inputted phase words, when the desired narrowband signals are centered, they will not exhibit a systematic phase rotation continuously in one direction or the other unless caused to do so by information modulation.
- the phase changes due to information modulation shall not of course be removed as they must be preserved for demodulation of the information.
- the frequency shifter 300 is adapted to extract first narrowband signals transmitted by transmitter 7a and second narrowband signals transmitted by transmitter 7b.
- the first and second narrowband signals contain the same information but are transmitted at different radio channel frequencies and from different transmitters 7a, 7b to provide for diversity transmission.
- the first narrowband signals and second narrowband signals after passing through wide filter apparatus 115, lie within the wide filter bandwidth and occupy off-center subbands. More specifically, the first and second narrowband signals may lie on opposite sides of the center frequency of the wide filter bandwidth.
- the frequency shifter 300 configured by digital signal processor 150 thus may correspondingly include a positive frequency shifter 302 for centering the first narrowband signals and a negative frequency shifter 304 for centering the second narrowband signals.
- the positive frequency shifter 302 frequency shifts samples of the digital signals upwards by an amount FI calculated to position the first narrowband signals in the center of the wide filter bandwidth and produces first frequency-shifted samples.
- the negative frequency shifter 304 frequency shifts the same samples of the digital signal downwards in an amount F2 calculated to position the second narrowband signal in the center of the wide filter bandwidth and produces second frequency-shifted samples.
- samples of the phase words are processed by both positive frequency shifter 302 and negative frequency shifter 304.
- the positive frequency shifter 302 adds positive phase slopes to positively shift the inputted phase words.
- the positive phase slopes added are calculated to shift the first narrowband signals to the center frequency of the wide filter bandwidth.
- Positively shifted phase words are generated by the positive frequency shifter 302 and together with samples of the amplitude words form first frequency-shifted signals in which the first narrowband signals are centered.
- the negative frequency shifter 304 adds negative phase slopes to negatively shift the inputted phase words.
- the negative phase slopes added are calculated to shift the second narrowband signals to the same center frequency to which the first narrowband signals have been shifted.
- Negatively shifted phase words are generated by the negative frequency shifter 304 and together with samples of the amplitude words form second frequency shifted signals in which the second narrowband signals are centered.
- the digital signal processor 150 also includes amplitude sealer 306 for normalizing the amplitude associated with the frequency-shifted signals generated by frequency shifter 300.
- the amplitude sealer 306 normalizes the frequency- shifted signals to a convenient level by adding or subtracting scaling factors to/from the digital logamplitude signal. This factor should only change slowly to avoid disturbing the relative values of samples in a consecutive block and means to perform such post-digitization AGC by computing a moving average are disclosed in the parent application.
- Digitally normalizing a signal after it has been digitized is advantageous because more accurate, flexible and intelligent scaling systems can be devised using numerical processing than are practical in the analog domain where the signals have not been digitized.
- polar-to-Cartesian converters 308a, 308b configured by digital signal processor 150 conve ⁇ each scaled and frequency-shifted digital signal from logpolar form to Cartesian form.
- the polar-to-Cartesian converter 308 includes a pair of 1,Q converters 308a, 308b for converting the frequency-shifted signals.
- ThexJigital signals when converted into Cartesian form have a real part, conventionally denoted by the symbol I and an imaginary part denoted by Q.
- the digital signals are converted to Cartesian form because the desired narrowband signals can be more effectively filtered when in Cartesian form. -12-
- first frequency-shifted signals represented by I,, Q, and second frequency-shifted signals represented by I 2 , Q 2 are processed by digital narrowband filter 310.
- the same physical filter logic can be time-shared to successively filter all four signals I,, Q I 2 , Q 2 alike.
- Digital narrowband filter 310 functions to extract the desired first and second narrowband signals which have been centered.
- the digital filter 310 has a low-pass cut-off frequency equal to the half-bandwidth of the desired centralized subband to which the desired narrowband signals have been shifted.
- Such filters can include FIR filters and IIR filters and are well known in the state of the art in digital filtering.
- the parent application discloses (parent application Figure 3) the use of 64-tap FIR filters that are defined by 64 coefficients which can be chosen to realize many different desirable filter frequency responses.
- the digital filter 310 computes digital signals 111, Qll and I,', Q,' and I 2 ', Q 2 ' which can occur at a lower computation rate than the input sampling rate, commensurate with the bandwidth reduction.
- the output sampling rate should be at least twice the low-pass filter bandwidth, that is at least equal to the subband 's whole bandwidth, in order to satisfy Nyquist's sampling theorem.
- the digital filter may thus perform reduction of sampling rate (downsampling) at the same time as filtering.
- two or more different narrowband signals falling within different subbands of the original wide bandwidth analog signal can be extracted simultaneously to provide for diversity demodulation.
- Different narrowband signals are simultaneously extracted from a wide bandwidth analog signal by converting the analog signal to a digital signal and then logpolar scaling, logpolar shifting, logpolar-to-Cartesian converting and I, Q filtering two or more subbands of the original wide bandwidth signal.
- the different narrowband signals are simultaneously or jointly extracted through use of duplicate frequency shifters 302, 304, amplitude sealer 306 and digital filters 310.
- the logpolar digital signal is subjected to an additive scaling and two (or more) modulo phase operations to produce two (or more) scaled and shifted signals lying centrally in the digital baseband.
- the different narrowband signals are simultaneously or jointly extracted by time sharing the discussed circuits used to extract the narrowband signals.
- the I,, Q and I 2 , Q 2 signals (four real sample streams in total) may be filtered using a single FIR filter 201 used in a time shared manner to produce two filtered subband signals.
- the downsampled digital samples I,', Q,, and I 2 ', Q 2 ' representing the extracted narrowband signals are inputted to diversity narrowband demodulator 312 which is then adapted to the method of modulation and coding used at the transceivers 7a, 7b.
- Diversity narrowband demodulator 312 can provide demodulation of the signals through various digital demodulation and decoding algorithms.
- Diversity narrowband demodulator 312, for example, can operate according to any of the methods described in U.S. patent application Serial No. 08/218,236 filed March 28, 1994, and entitled "Diversity Pi/4-DQPSK
- Demodulation which is hereby incorporated by reference
- other forms of processing may be used such as the combined demodulation and decoding method abbreviated to "decodulation” described in U.S. patent application Serial No. 08/305,787, filed September 14, 1994, and entitled “Simultaneous Demodulation and Decoding of a Digitally Modulated Radio Signal, " which is incorporated by reference.
- decodulation may be extended to perform diversity decodulation by use of metric combining.
- the technique of metric combining for diversity reception can also be used in the invention with or without decodulation, and is more fully described in the following references which are hereby incorporated by reference: U.S. Patent No.
- Receiver 2 can be adapted to operate for various different standards employing FDMA, TDMA, or a combination of FDMA and TDMA.
- receiver circuits shown in Figure 1 can be triggered by a TDMA timing generator to operate only in defined portions of a TDMA frame in order to collect samples over that timeslot in a memory.
- the samples in the memory can then be processed by the digital signal processor 150 configured as shown in Figure 3 to generate subband samples corresponding to the same timeslot on two different frequencies, or indeed different timeslots on the same frequency, or different timeslots on different frequencies in order to produce two subband sample blocks.
- These subband sample blocks containing the desired narrowband signals are then diversity processed according to any of the aforementioned incorporated references.
- the technique of receiving two narrowband signals simultaneously and diversity combining them in the above inventive way can be used with analog frequency modulated signals of NAMPS type, and can be useful in effecting a make-before-break or soft handover for radios 3 crossing the boundary between two cells having associated base station narrowband transceivers 7a, 7b.
- the base station narrowband transceivers 7a, 7b are each caused to transmit the same modulation on neighboring frequency channels for a period and the radio 3 receives and combines both when located in the border or handover zone. When one signal becomes dominant and the other of insignificant signal strength, transmission of the insignificant signal is discontinued from the no longer useful transceiver 7a or 7b.
- the no longer useful transceiver 7a or 7b can allocate the radio channel frequency of the insignificant signal to another radio.
- Soft handovers for radios crossing the boundaries between different transceivers i.e. , cell boundaries
- the invention of an advantageous method of diversity reception of narrowband signals from two signal sources can thus be translated into an improved method for performing glitch-free soft handover in a mobile radio communication system, or can be used merely to enhance communications link margin, as for example is usually desired in power-limited satellite communications applications.
- the method of selecting one or more subbandwidths by a radio receiver 2 with the aid of logpolar processing is however more general than either of these specific applications.
- receiver 2 can also be provided.
- digitizer 125 can be configured to convert the analog radio signal to a Cartesian or other digitized form which retains the full complex vector nature of the received radio signal. These other digitized forms can then be shifted and processed to extract one or more narrowband signals lying off-center of the wide filter bandwidth.
- Various methods are capable of digitizing a radio signal while preserving its full, complex- vector value.
- the radio signal can be digitized through quadrature downconversion, quadrature sampling, and the homodyne receiver technique described in U.S. Patent No.
- the inventive radio 3 embodying both wide and narrowband modes may be switched between modes as described in U.S. patent application Serial No. 08/305,780, filed September 14, 1994, and entitled "Dual-Mode Frequency Synthesizer for Satellite/Cellular Phones," which is incorporated herein. Switching between modes is not a likely occurrence when the radio 3 is in active use during a call, but is more likely to occur when the radio 3 is in the idle or standby condition.
- Radios 3, particularly of the TDMA variety can employ sleep-mode techniques to reduce battery drain in standby. Sleep modes comprise adoption of a particular formatting of the calling or paging channel to which radios 3 listen on standby for calls.
- the paging channel is divided into a number of timeslots known as sleep-mode slots and each radio 3 is allocated a particular sleep-mode slot to monitor.
- the slot allocation can for example be linked to the radio's number, e.g., the last digit of the number. Then the system will know that a call for a radio number ending in 9 should be sent in slot 9, when the radio 3 is awake and receiving the data. In this way, receivers 2 of the radio 3 only need to be awake for a fraction of the time during standby, saving battery power.
- a dual-mode radio 3 that may be served by a wideband system having a wideband transceiver 6 or a narrowband system having transceivers 7a, 7b
- the time between sleep-mode slots on one system may be used to scan for signals of the other system.
- the radio 3 may, while listening to the calling channel of one system, search for and determine the signal strength or quality of paging channels of another system. If the current paging channel being decoded is a wideband signal, the radio 3 can switch to a narrowband mode between sleep- mode slots of the wideband system in order to search for narrowband paging channels, e.g., those of a mobile satellite system.
- a radio 3 locked to a narrowband AMPS control channel, and incorporating intermittent reception may switch to the wideband mode to search for an IS-95 CDMA calling channel or pilot signal.
- the radio 3 adapted for AMPS incorporates the power-saving, intermittent reception features described in U.S. patent application Serial No. 08/059,932, filed May 11, 1993, and entitled "Standby Power Savings with Cumulative Parity Check in Mobile Phones,' which is hereby incorporated by reference, then it may utilize the time saved from listening to the AMPS channel to scan for energy in channels of other systems such as IS-95 without loss of AMPS information, even though the AMPS control channel does not specifically adopt a sleep-mode slotted format.
- the present invention may alternatively facilitate the construction of dual mode AMPS/IS-95 phones, triple-mode AMPS/IS-54/IS-95 phones, triple mode AMPS/NAMPS/IS-95 phones or quadruple-mode AMPS/NAMPS/IS-54/IS-95 radios. It will be appreciated by those of ordinary skill in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential character thereof. The presently disclosed embodiments are therefore considered in all respects to be illustrative and not restrictive.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Structure Of Receivers (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
Claims
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/383,036 US5668837A (en) | 1993-10-14 | 1995-02-03 | Dual-mode radio receiver for receiving narrowband and wideband signals |
PCT/US1996/003069 WO1997032403A1 (en) | 1993-10-14 | 1996-03-01 | Dual-mode radio receiver for receiving narrowband and wideband signals |
CA002247911A CA2247911A1 (en) | 1993-10-14 | 1996-03-01 | Dual-mode radio receiver for receiving narrowband and wideband signals |
CN96180258.8A CN1106720C (en) | 1993-10-14 | 1996-03-01 | Dual-mode radio receiver for receiving narrowband and wide band signals |
JP53090297A JP3846738B2 (en) | 1993-10-14 | 1996-03-01 | Dual mode radio receiver for receiving narrowband and wideband signals |
BR9612534A BR9612534A (en) | 1993-10-14 | 1996-03-01 | Radio receiver process for receiving radio signals and radio communication system |
AU54191/96A AU716365B2 (en) | 1993-10-14 | 1996-03-01 | Dual-mode radio receiver for receiving narrowband and wideband signals |
EP96911249A EP0883934B1 (en) | 1993-10-14 | 1996-03-01 | Dual-mode radio receiver for receiving narrowband and wide band signals |
KR1019980706871A KR19990087447A (en) | 1996-03-01 | 1996-03-01 | Dual-mode radio receiver for receiving narrowband and wideband signals |
DE69623337T DE69623337T2 (en) | 1993-10-14 | 1996-03-01 | TWO-MODE RADIO RECEIVERS FOR RECEIVING BROADBAND AND NARROWBAND SIGNALS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13554293A | 1993-10-14 | 1993-10-14 | |
PCT/US1996/003069 WO1997032403A1 (en) | 1993-10-14 | 1996-03-01 | Dual-mode radio receiver for receiving narrowband and wideband signals |
Publications (1)
Publication Number | Publication Date |
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WO1997032403A1 true WO1997032403A1 (en) | 1997-09-04 |
Family
ID=51452935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/003069 WO1997032403A1 (en) | 1993-10-14 | 1996-03-01 | Dual-mode radio receiver for receiving narrowband and wideband signals |
Country Status (9)
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---|---|
US (1) | US5668837A (en) |
EP (1) | EP0883934B1 (en) |
JP (1) | JP3846738B2 (en) |
CN (1) | CN1106720C (en) |
AU (1) | AU716365B2 (en) |
BR (1) | BR9612534A (en) |
CA (1) | CA2247911A1 (en) |
DE (1) | DE69623337T2 (en) |
WO (1) | WO1997032403A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999023790A1 (en) * | 1997-11-03 | 1999-05-14 | Intermec Ip Corp. | Multi-mode radio frequency network system |
EP1111803A1 (en) * | 1999-12-23 | 2001-06-27 | Motorola, Inc. | Dual mode with a single receiver circuit |
WO2004030387A1 (en) * | 2002-09-26 | 2004-04-08 | Lars Edman | Direct cellular communication |
CN100346579C (en) * | 2005-11-18 | 2007-10-31 | 杭州天寅无线通信有限公司 | Double mode transmission mode for antenna feed line signal |
US8774101B2 (en) | 2006-12-04 | 2014-07-08 | Samsung Electronics Co., Ltd. | Apparatus and method for frame structure in wide-band wireless communication system |
WO2019170875A1 (en) * | 2018-03-09 | 2019-09-12 | Nokia Solutions And Networks Oy | Reception of signals from multiple sources |
Families Citing this family (96)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7924783B1 (en) | 1994-05-06 | 2011-04-12 | Broadcom Corporation | Hierarchical communications system |
US6970434B1 (en) * | 1995-06-07 | 2005-11-29 | Broadcom Corporation | Hierarchical communication system providing intelligent data, program and processing migration |
US6195555B1 (en) | 1994-01-11 | 2001-02-27 | Ericsson Inc. | Method of directing a call to a mobile telephone in a dual mode cellular satellite communication network |
US6868270B2 (en) | 1994-01-11 | 2005-03-15 | Telefonaktiebolaget L.M. Ericsson | Dual-mode methods, systems, and terminals providing reduced mobile terminal registrations |
EP0662758B1 (en) * | 1994-01-11 | 2000-11-29 | Ericsson Inc. | Position registration for cellular satellite communication systems |
US6418324B1 (en) | 1995-06-01 | 2002-07-09 | Padcom, Incorporated | Apparatus and method for transparent wireless communication between a remote device and host system |
US5914990A (en) * | 1995-11-22 | 1999-06-22 | Telefonaktiebolaget Lm Ericsson | Filtering in a receiver that uses log-polar signal processing |
KR0159201B1 (en) * | 1995-12-06 | 1998-12-01 | 양승택 | Coherent dual-channel qpsk modulator, demodulator and modulating and demodulating method for cdma systems |
US7590083B2 (en) * | 1995-12-07 | 2009-09-15 | Transcore Link Logistics Corp. | Wireless packet data distributed communications system |
SE512927C2 (en) * | 1997-01-30 | 2000-06-05 | Ericsson Telefon Ab L M | Wireless terminal operating according to more than one air interface protocol |
US6151373A (en) * | 1997-04-03 | 2000-11-21 | At&T Corp. | Weak signal resolver |
US6169733B1 (en) * | 1997-05-12 | 2001-01-02 | Northern Telecom Limited | Multiple mode capable radio receiver device |
US6178314B1 (en) * | 1997-06-27 | 2001-01-23 | Visteon Global Technologies, Inc. | Radio receiver with adaptive bandwidth controls at intermediate frequency and audio frequency sections |
JPH11346172A (en) * | 1998-03-30 | 1999-12-14 | Kokusai Electric Co Ltd | Receiver |
US5970105A (en) * | 1998-05-11 | 1999-10-19 | Cleveland Medical Devices Inc. | Apparatus and method for efficient wireless communications in the presence of frequency error |
US5978365A (en) * | 1998-07-07 | 1999-11-02 | Orbital Sciences Corporation | Communications system handoff operation combining turbo coding and soft handoff techniques |
US6496546B1 (en) * | 1998-07-15 | 2002-12-17 | Lucent Technologies Inc. | Software-defined transceiver for a wireless telecommunications system |
US6192239B1 (en) | 1998-07-29 | 2001-02-20 | Nortel Networks Limited | Handset based automatic call re-initiation for multi-mode handsets |
JP3974712B2 (en) * | 1998-08-31 | 2007-09-12 | 富士通株式会社 | Digital broadcast transmission / reception reproduction method, digital broadcast transmission / reception reproduction system, digital broadcast transmission apparatus, and digital broadcast reception / reproduction apparatus |
US6714898B1 (en) * | 1998-09-02 | 2004-03-30 | Anritsu Company | Flexible noise figure measurement apparatus |
GB2341993B (en) | 1998-09-25 | 2003-03-12 | Nec Technologies | Radio receivers |
US6134427A (en) * | 1998-09-30 | 2000-10-17 | Conexant Systems, Inc. | Using a single low-noise amplifier in a multi-band wireless station |
US8078727B2 (en) | 1998-10-09 | 2011-12-13 | Netmotion Wireless, Inc. | Method and apparatus for providing mobile and other intermittent connectivity in a computing environment |
US7293107B1 (en) | 1998-10-09 | 2007-11-06 | Netmotion Wireless, Inc. | Method and apparatus for providing mobile and other intermittent connectivity in a computing environment |
US8060656B2 (en) | 1998-10-09 | 2011-11-15 | Netmotion Wireless, Inc. | Method and apparatus for providing mobile and other intermittent connectivity in a computing environment |
US7136645B2 (en) | 1998-10-09 | 2006-11-14 | Netmotion Wireless, Inc. | Method and apparatus for providing mobile and other intermittent connectivity in a computing environment |
US7778260B2 (en) | 1998-10-09 | 2010-08-17 | Netmotion Wireless, Inc. | Method and apparatus for providing mobile and other intermittent connectivity in a computing environment |
US6546425B1 (en) * | 1998-10-09 | 2003-04-08 | Netmotion Wireless, Inc. | Method and apparatus for providing mobile and other intermittent connectivity in a computing environment |
DE69803574T2 (en) * | 1998-10-27 | 2002-08-29 | Robert Bosch Gmbh | Method for estimating the channel impulse response of a signal transmission channel and mobile station |
US6205334B1 (en) * | 1998-11-24 | 2001-03-20 | Ericsson Inc. | Accelerated scanning of cellular channels by cellular radiotelephones |
US6334059B1 (en) | 1999-01-08 | 2001-12-25 | Trueposition, Inc. | Modified transmission method for improving accuracy for e-911 calls |
US7783299B2 (en) | 1999-01-08 | 2010-08-24 | Trueposition, Inc. | Advanced triggers for location-based service applications in a wireless location system |
US6873290B2 (en) * | 1999-01-08 | 2005-03-29 | Trueposition, Inc. | Multiple pass location processor |
US6646604B2 (en) | 1999-01-08 | 2003-11-11 | Trueposition, Inc. | Automatic synchronous tuning of narrowband receivers of a wireless location system for voice/traffic channel tracking |
AU3120500A (en) * | 1999-01-08 | 2000-07-24 | Trueposition, Inc. | Multiple demodulation protocols for a wireless location system |
WO2000041402A2 (en) | 1999-01-08 | 2000-07-13 | Trueposition, Inc. | A signal collection system |
US6463290B1 (en) | 1999-01-08 | 2002-10-08 | Trueposition, Inc. | Mobile-assisted network based techniques for improving accuracy of wireless location system |
US6782264B2 (en) | 1999-01-08 | 2004-08-24 | Trueposition, Inc. | Monitoring of call information in a wireless location system |
US6184829B1 (en) * | 1999-01-08 | 2001-02-06 | Trueposition, Inc. | Calibration for wireless location system |
US6765531B2 (en) | 1999-01-08 | 2004-07-20 | Trueposition, Inc. | System and method for interference cancellation in a location calculation, for use in a wireless location system |
FR2788904A1 (en) * | 1999-01-27 | 2000-07-28 | France Telecom | Mobile telephone/TV receiver logic preprocessing digital architecture having input signal filtered/level set and signal standard found/narrow band conversion and digital demodulation effected. |
US7882247B2 (en) | 1999-06-11 | 2011-02-01 | Netmotion Wireless, Inc. | Method and apparatus for providing secure connectivity in mobile and other intermittent computing environments |
US20010030988A1 (en) * | 2000-03-31 | 2001-10-18 | Fry Terry L. | Spread spectrum, frequency hopping transceiver with frequency discriminator quadrature filter |
JP2001345731A (en) * | 2000-06-06 | 2001-12-14 | Matsushita Electric Ind Co Ltd | Multi-mode portable telephone terminal |
JP2002033675A (en) * | 2000-07-13 | 2002-01-31 | Sony Corp | Multi-band transmission reception signal generator and its method, and multi-band radio signal transmitter/ receiver |
US6823170B1 (en) * | 2000-07-26 | 2004-11-23 | Ericsson Inc. | Satellite communications system using multiple earth stations |
US6859652B2 (en) | 2000-08-02 | 2005-02-22 | Mobile Satellite Ventures, Lp | Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis |
US7289461B2 (en) * | 2001-03-15 | 2007-10-30 | Qualcomm Incorporated | Communications using wideband terminals |
US20020193090A1 (en) * | 2001-05-23 | 2002-12-19 | Sugar Gary L. | System and method for dynamic sampling rate adjustment to minimize power consumption in wideband radios |
US7644171B2 (en) | 2001-09-12 | 2010-01-05 | Netmotion Wireless, Inc. | Mobile networking system and method using IPv4 and IPv6 |
CN100403401C (en) * | 2001-09-28 | 2008-07-16 | 诺基亚西门子通信有限责任两合公司 | Speech extender and method for estimating broadband speech signal from narrowband speech signal |
US7020230B2 (en) | 2001-12-28 | 2006-03-28 | Tropian, Inc. | Frequency synthesizer for dual mode receiver |
GB0204108D0 (en) * | 2002-02-21 | 2002-04-10 | Analog Devices Inc | 3G radio |
US7221688B2 (en) * | 2002-07-31 | 2007-05-22 | Ibiquity Digital Corporation | Method and apparatus for receiving a digital audio broadcasting signal |
TW566011B (en) * | 2002-09-23 | 2003-12-11 | Ind Tech Res Inst | Dual mode receiving method and device |
US7203488B2 (en) * | 2002-11-08 | 2007-04-10 | Louis Luneau | Flexible software radio transceiver |
US6970685B2 (en) * | 2003-02-14 | 2005-11-29 | Ibiquity Digital Corporation | Method and apparatus for dynamic filter selection in radio receivers |
JP2004349805A (en) * | 2003-05-20 | 2004-12-09 | Alpine Electronics Inc | Iboc broadcast receiver |
US8204149B2 (en) | 2003-12-17 | 2012-06-19 | Qualcomm Incorporated | Spatial spreading in a multi-antenna communication system |
US7336746B2 (en) * | 2004-12-09 | 2008-02-26 | Qualcomm Incorporated | Data transmission with spatial spreading in a MIMO communication system |
US7433708B2 (en) | 2004-02-04 | 2008-10-07 | Nokia Corporation | Variable bandwidth in a communication system |
US20050180312A1 (en) * | 2004-02-18 | 2005-08-18 | Walton J. R. | Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system |
US8169889B2 (en) | 2004-02-18 | 2012-05-01 | Qualcomm Incorporated | Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system |
US20050238111A1 (en) * | 2004-04-09 | 2005-10-27 | Wallace Mark S | Spatial processing with steering matrices for pseudo-random transmit steering in a multi-antenna communication system |
US8923785B2 (en) * | 2004-05-07 | 2014-12-30 | Qualcomm Incorporated | Continuous beamforming for a MIMO-OFDM system |
US8285226B2 (en) * | 2004-05-07 | 2012-10-09 | Qualcomm Incorporated | Steering diversity for an OFDM-based multi-antenna communication system |
US7110463B2 (en) * | 2004-06-30 | 2006-09-19 | Qualcomm, Incorporated | Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system |
US7978649B2 (en) * | 2004-07-15 | 2011-07-12 | Qualcomm, Incorporated | Unified MIMO transmission and reception |
US7978778B2 (en) | 2004-09-03 | 2011-07-12 | Qualcomm, Incorporated | Receiver structures for spatial spreading with space-time or space-frequency transmit diversity |
US7672258B1 (en) * | 2004-09-24 | 2010-03-02 | Nortel Networks Limited | Signalling channel and radio system for power saving in wireless devices |
US20070015472A1 (en) * | 2005-07-15 | 2007-01-18 | Simo Murtojarvi | Multimode transmitter, module, communication device and chip set |
US7933577B2 (en) * | 2005-11-29 | 2011-04-26 | Electronics And Telecommunications Research Institute | Method and apparatus for sharing portable terminal in CDMA system and mobile RFID system |
US8543070B2 (en) | 2006-04-24 | 2013-09-24 | Qualcomm Incorporated | Reduced complexity beam-steered MIMO OFDM system |
US8290089B2 (en) * | 2006-05-22 | 2012-10-16 | Qualcomm Incorporated | Derivation and feedback of transmit steering matrix |
EP2051391A4 (en) * | 2006-08-31 | 2012-03-14 | Clarion Co Ltd | Iboc broadcast receiver |
US8660104B2 (en) * | 2006-09-29 | 2014-02-25 | Broadcom Corporation | Method and system for communicating information in a multi-antenna system |
WO2008054306A2 (en) * | 2006-11-01 | 2008-05-08 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and arrangement for reducing power consumption in user equipments in multi-carrier radio systems. |
JP4274240B2 (en) * | 2006-12-28 | 2009-06-03 | ブラザー工業株式会社 | Communication device |
US20080169878A1 (en) * | 2007-01-12 | 2008-07-17 | Giuseppe Resnati | Low loss combiner for narrowband and wideband rf signals |
US9019934B2 (en) | 2007-10-24 | 2015-04-28 | Hmicro, Inc. | Systems and networks for half and full duplex wireless communication using multiple radios |
GB2469420B (en) * | 2008-02-06 | 2012-10-17 | Hmicro Inc | Wireless communications systems using multiple radios |
EP2239860B1 (en) * | 2009-04-07 | 2012-08-15 | The Swatch Group Research and Development Ltd. | High-sensitivity, low-rate fsk modulation signal receiver |
US8213957B2 (en) | 2009-04-22 | 2012-07-03 | Trueposition, Inc. | Network autonomous wireless location system |
CN102893530B (en) * | 2010-05-06 | 2014-09-17 | 联发科技股份有限公司 | Signal receiving apparatus and related signal receiving method thereof |
WO2018126197A1 (en) | 2016-12-30 | 2018-07-05 | Waviot Integrated Systems, Llc | A method for multichannel signal search and demodulation and tech nique to demodulate and detect dbpsk fdma ultra-narrow band signal |
WO2018126195A1 (en) * | 2016-12-30 | 2018-07-05 | Waviot Integrated Systems, Llc | System-on-chip for low-speed noise-resistant data transmission |
US10326556B2 (en) | 2016-12-30 | 2019-06-18 | Waviot Integrated Systems, Llc | Method and system of frequency correction in LPWAN networks |
WO2018126204A1 (en) | 2016-12-30 | 2018-07-05 | Waviot Integrated Systems, Llc | Simultaneous confirmation of many messages in lpwan & frequency correction for data transmission |
US10419063B2 (en) | 2016-12-30 | 2019-09-17 | Waviot Integrated Systems, Llc | Method and system for receiving telemetry messages over RF channel |
US10813014B2 (en) | 2017-03-24 | 2020-10-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Receiving a periodic, wideband synchronization signal in a narrowband receiver |
EP3602851B1 (en) | 2017-03-24 | 2022-09-28 | Telefonaktiebolaget LM Ericsson (PUBL) | Nr wideband sync detection |
US10711762B2 (en) | 2017-07-20 | 2020-07-14 | Jmcc Wing, Llc | Wind energy systems |
CN111030715B (en) * | 2019-02-26 | 2022-07-15 | 安天科技集团股份有限公司 | Method, device and storage medium for receiving broadband radio frequency signal by narrow-band radio frequency front end |
CN111426889B (en) * | 2020-04-14 | 2022-04-29 | 中国科学院国家天文台 | Broadband dual-mode digital receiver and signal processing method thereof |
CN113630732B (en) * | 2020-05-07 | 2022-07-22 | 海能达通信股份有限公司 | Converged communication method, terminal, system and storage medium |
CN116155301B (en) * | 2023-02-13 | 2024-07-05 | 深圳市烽云技术有限公司 | Multi-antenna width integration ad hoc network communication equipment based on minimum communication |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5179360A (en) * | 1991-03-20 | 1993-01-12 | Sony Corporation | Transmitting/receiving apparatus switchable between digital and analog modulation modes |
GB2258104A (en) * | 1991-06-13 | 1993-01-27 | Hughes Aircraft Co | Digital receiver with multiple channels translated simultaneously into adjacentif slots |
EP0550146A1 (en) * | 1991-12-31 | 1993-07-07 | AT&T Corp. | Digital block processor for processing a plurality of transmission channels in a wireless radiotelephony system |
Family Cites Families (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51127609A (en) * | 1975-04-28 | 1976-11-06 | Trio Kenwood Corp | Switching circuit for band width of intermediate frequency amplifying stage of fm receiver |
US4045740A (en) * | 1975-10-28 | 1977-08-30 | The United States Of America As Represented By The Secretary Of The Army | Method for optimizing the bandwidth of a radio receiver |
US4356567A (en) * | 1977-06-28 | 1982-10-26 | Pioneer Electronic Corporation | Radio receiver with bandwidth switching |
US4267605A (en) * | 1979-02-26 | 1981-05-12 | Trio Kabushiki Kaisha | Interference eliminator in communication receiver |
US4262361A (en) * | 1979-06-29 | 1981-04-14 | Edmac Associates, Inc. | Variable bandwidth filtering and frequency converting system |
US4352208A (en) * | 1980-03-04 | 1982-09-28 | Motorola, Inc. | Automatic IF selectivity for radio receiver system |
FR2490427B1 (en) * | 1980-09-16 | 1986-04-18 | Thomson Csf | DEMODULATOR OF A FREQUENCY MODULATED SIGNAL AND TELEVISION SYSTEM COMPRISING SUCH A DEMODULATOR |
JPS5793704A (en) * | 1980-12-03 | 1982-06-10 | Alps Electric Co Ltd | Fm demodulation circuit |
CA1190289A (en) * | 1981-04-28 | 1985-07-09 | Nippon Hoso Kyokai | Fm signal demodulation system |
US4406019A (en) * | 1981-11-16 | 1983-09-20 | The Bendix Corporation | Selectivity means in amplitude modulated radio receivers |
US4479257A (en) * | 1982-12-30 | 1984-10-23 | Yaesu Musen Co., Ltd. | Superheterodyne circuit having variable bandwidth and center frequency shift function |
US4792993A (en) * | 1985-10-30 | 1988-12-20 | Capetronic (Bsr) Ltd. | TVRD receiver system with automatic bandwidth adjustment |
US4761829A (en) * | 1985-11-27 | 1988-08-02 | Motorola Inc. | Adaptive signal strength and/or ambient noise driven audio shaping system |
DE3724604A1 (en) * | 1987-04-15 | 1988-12-01 | H U C Elektronik Gmbh | ARRANGEMENT FOR FILTERING AN FM VHF RECEPTION SIGNAL |
US4816770A (en) * | 1987-07-10 | 1989-03-28 | Satellite Transmission Systems | Adaptive FM threshold extension demodulator |
US5136645A (en) * | 1987-07-17 | 1992-08-04 | Brockman Milton H | Bandwidth controller for phase-locked-loop |
JPS6489709A (en) * | 1987-09-30 | 1989-04-04 | Toshiba Corp | Band width variable circuit |
SE8802229D0 (en) * | 1988-06-14 | 1988-06-14 | Ericsson Telefon Ab L M | MOBILE RADIO STATION PROCEDURE |
JPH02186723A (en) * | 1988-08-25 | 1990-07-23 | Nec Corp | Receiver |
SE463540B (en) * | 1988-09-19 | 1990-12-03 | Ericsson Telefon Ab L M | SEAT TO DIGITALIZE ANY RADIO SIGNALS IN A RADIO COMMUNICATION SYSTEM AND DEVICE TO EXERCISE THE SET |
CH676179A5 (en) * | 1988-09-29 | 1990-12-14 | Ascom Zelcom Ag | |
US4885553A (en) * | 1988-11-30 | 1989-12-05 | Motorola, Inc. | Continuously adaptive phase locked loop synthesizer |
US5105164A (en) * | 1989-02-28 | 1992-04-14 | At&T Bell Laboratories | High efficiency uhf linear power amplifier |
SE463584B (en) * | 1989-04-20 | 1990-12-10 | Ericsson Telefon Ab L M | SET AND DEVICE PROVIDES ANY DIGITAL SEATING OF THE TIME OR PHASES OF A SIGNAL PULSE TAG |
US5058204A (en) * | 1989-08-02 | 1991-10-15 | Motorola, Inc. | Synthesized selective call receiver having variable characteristics |
US5012490A (en) * | 1989-12-26 | 1991-04-30 | At&T Bell Laboratories | Varying bandwidth digital signal detector |
SE465597B (en) * | 1990-02-16 | 1991-09-30 | Ericsson Telefon Ab L M | PROCEDURE TO REDUCE THE EFFECT OF BREATHING ON A WHITE RECEIVER WITH AT LEAST TWO ANTENNA |
DE4005272A1 (en) * | 1990-02-20 | 1991-08-22 | Bosch Gmbh Robert | METHOD FOR ZF BANDWIDTH SWITCHING AND ZF BANDWIDTH SWITCHING DEVICE |
US5084669A (en) * | 1990-03-08 | 1992-01-28 | Telefonaktiebolaget L M Ericsson | Direct phase digitization |
US5241702A (en) * | 1990-09-06 | 1993-08-31 | Telefonaktiebolaget L M Ericsson | D.c. offset compensation in a radio receiver |
US5287556A (en) * | 1990-09-28 | 1994-02-15 | Motorola, Inc. | Interference reduction using an adaptive receiver filter, signal strength, and BER sensing |
US5068625A (en) * | 1990-12-14 | 1991-11-26 | Motorola, Inc. | Method for fast frequency acquisition in a phase locked loop |
US5097221A (en) * | 1990-12-21 | 1992-03-17 | The United States Of America As Represented By The Secretary Of The Navy | Adaptive filter technique for suppression of wideband or offset narrowband radio frequency interference |
US5233626A (en) * | 1992-05-11 | 1993-08-03 | Space Systems/Loral Inc. | Repeater diversity spread spectrum communication system |
US5323391A (en) * | 1992-10-26 | 1994-06-21 | Motorola, Inc. | Multi-channel digital transmitter and receiver |
-
1995
- 1995-02-03 US US08/383,036 patent/US5668837A/en not_active Expired - Lifetime
-
1996
- 1996-03-01 AU AU54191/96A patent/AU716365B2/en not_active Ceased
- 1996-03-01 CA CA002247911A patent/CA2247911A1/en not_active Abandoned
- 1996-03-01 BR BR9612534A patent/BR9612534A/en active Search and Examination
- 1996-03-01 EP EP96911249A patent/EP0883934B1/en not_active Expired - Lifetime
- 1996-03-01 JP JP53090297A patent/JP3846738B2/en not_active Expired - Lifetime
- 1996-03-01 WO PCT/US1996/003069 patent/WO1997032403A1/en active IP Right Grant
- 1996-03-01 DE DE69623337T patent/DE69623337T2/en not_active Expired - Lifetime
- 1996-03-01 CN CN96180258.8A patent/CN1106720C/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5179360A (en) * | 1991-03-20 | 1993-01-12 | Sony Corporation | Transmitting/receiving apparatus switchable between digital and analog modulation modes |
GB2258104A (en) * | 1991-06-13 | 1993-01-27 | Hughes Aircraft Co | Digital receiver with multiple channels translated simultaneously into adjacentif slots |
EP0550146A1 (en) * | 1991-12-31 | 1993-07-07 | AT&T Corp. | Digital block processor for processing a plurality of transmission channels in a wireless radiotelephony system |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999023790A1 (en) * | 1997-11-03 | 1999-05-14 | Intermec Ip Corp. | Multi-mode radio frequency network system |
US6295461B1 (en) | 1997-11-03 | 2001-09-25 | Intermec Ip Corp. | Multi-mode radio frequency network system |
EP1111803A1 (en) * | 1999-12-23 | 2001-06-27 | Motorola, Inc. | Dual mode with a single receiver circuit |
US6931241B2 (en) | 1999-12-23 | 2005-08-16 | Freescale Semiconductor, Inc. | Dual digital low IF complex receiver |
KR100736057B1 (en) * | 1999-12-23 | 2007-07-06 | 프리스케일 세미컨덕터, 인크. | Dual digital low IF complex receiver |
WO2004030387A1 (en) * | 2002-09-26 | 2004-04-08 | Lars Edman | Direct cellular communication |
US7486963B2 (en) | 2002-09-26 | 2009-02-03 | Lars Edman | Direct cellular communication |
CN100346579C (en) * | 2005-11-18 | 2007-10-31 | 杭州天寅无线通信有限公司 | Double mode transmission mode for antenna feed line signal |
US8774101B2 (en) | 2006-12-04 | 2014-07-08 | Samsung Electronics Co., Ltd. | Apparatus and method for frame structure in wide-band wireless communication system |
WO2019170875A1 (en) * | 2018-03-09 | 2019-09-12 | Nokia Solutions And Networks Oy | Reception of signals from multiple sources |
Also Published As
Publication number | Publication date |
---|---|
CN1217100A (en) | 1999-05-19 |
JP2000505628A (en) | 2000-05-09 |
US5668837A (en) | 1997-09-16 |
CA2247911A1 (en) | 1997-09-04 |
DE69623337T2 (en) | 2003-01-16 |
BR9612534A (en) | 1999-07-20 |
AU716365B2 (en) | 2000-02-24 |
DE69623337D1 (en) | 2002-10-02 |
CN1106720C (en) | 2003-04-23 |
EP0883934A1 (en) | 1998-12-16 |
AU5419196A (en) | 1997-09-16 |
JP3846738B2 (en) | 2006-11-15 |
EP0883934B1 (en) | 2002-08-28 |
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