EP0180339A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A multi-mode radio transceiver
Assignee: STC PLC
•
Filing: 1985-10-02
•
Granted: —
•
Expires: 2005-10-02
Abstract
Abstract A multi-mode radio transceiver comprising a sequence of bi-directional circuit modules including a radio frequency input/output amplifier module (1), a radio frequency/baseband I and Q quadrature channel conversion module (2), an analogue/ digital conversion module (3), a digital signal processor (4, 5), and a digital signal input/output interface (6), with a control means (7) whereby for transmission a radio frequency signal is formed from analogue quadrature I and Q channel components of a digitised signal at baseband and translated to the radio tranmission frequency and for reception the radio frequency signals are transformed into I and Q quadrature analogue components at baseband and subsequently digitised.
Inventors
- 👤 John Masterton
- 👤 Peter Alan Ramsdale
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 23:50
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/403; H04B1/406; H03; H03C; H03C5/00; H03D; H03D1/00; H03D1/22; H03D1/2245; H03D3/00; H03D3/007; H03D3/008; H03D3/009; H03D5/00; H03D2200/00; H03D2200/0001; H03D2200/0025; H03D2200/0029; H03D2200/0041; H03D2200/0047; H03D2200/005; H03D2200/0052
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A multi-mode radio transceiver comprising a sequence of circuit modules characterised in that the modules are each bi-directional and include a radio frequency input/output amplifier module, a radio frequency/baseband I and Q quadrature channel conversion module, an analogue/digital conversion module, a digital signal processor, and a digital signal input/output interface, with a control means whereby for transmission a radio frequency signal is formed from analogue quadrature I and Q channel components of a digitised signal at baseband and translated to the radio transmission frequency and for reception the radio frequency signals are transformed into I and Q quadrature analogue components at baseband and subsequently digitised.
Claim 2
Dependent Claim
105 words
A multi-mode radio transceiver comprising a sequence of circuit modules characterised in that the modules are each bi-directional and include a radio frequency input/output amplifier module, a radio frequency/baseband I and Q quadrature channel conversion module, an analogue/digital conversion module, a digital signal processor, and a digital signal input/output interface, with a control means whereby for transmission a radio frequency signal is formed from analogue quadrature I and Q channel components of a digitised signal at baseband and translated to the radio transmission frequency and for reception the radio frequency signals are transformed into I and Q quadrature analogue components at baseband and subsequently digitised.
Claim 3
Dependent Claim
39 words
A multi-mode radio transceiver according to claim 1 characterised in that the digital signal processor module includes digital filtering means for the I and Q quadrature components and means for balancing the signals in the I and Q channels.
Claim 4
Dependent Claim
55 words
A multi-mode radio transceiver according to claim 2 characterised in that the balance means includes means for long term averaging of the signals to remove AC components of the I and Q signals respectively to derive correction terms and means for applying said correction terms in a feedforward loop to the I and Q channels.
Claim 5
Dependent Claim
72 words
A multi-mode radio transceiver according to claim 2 characterised in that the balance means includes means for deriving a long term average of the product of the I & Q channels, determining the sign of the phase imbalance error signal proportional to the product, means for generating corrections terms according to the sign and means for applying said correction terms in a feedback loop to phase balance the I & Q channels.
Claim 6
Dependent Claim
69 words
A multi-mode radio transceiver according to claim 2 characterised in that the balance means includes respective zero crossing detector means for the I and Q channels, phase comparison means to which the zero crossing detector outputs are applied, means for filtering the phase comparison output to derive a correction signal and means for applying said correction signal in a feedback loop to phase balance the I and Q channels.
Claim 7
Dependent Claim
82 words
A multi-mode radio transceiver according to claim 2 characterised in that the balance means includes means for rectifying separately the I & Q signals, means for deriving separately long term averages for the rectified I & Q signals, means for dividing the long term average of one channel by the long term average of the other channel to produce an amplitude balance correction factor and means for applying said correction factor in a feedforward loop to the signals in the other channel.
Claim 8
Dependent Claim
13 words
A multi-mode radio transceiver substantially as described with reference to the accompanying drawings.
Claim 9
Dependent Claim
13 words
A multi-mode radio transceiver substantially as described with reference to the accompanying drawings.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.