EP0683571A2
Expired / Lapsed
EP
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Diversity reception device
Assignee: Sanyo Electric Co Ltd
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Filing: 1995-05-15
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Granted: —
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Expires: 2015-05-15
Abstract
Abstract A diversity reception device which weights in proportion to the reception level and combines a plurality of reception signals, includes a phase demodulator (329-332) for demodulating the phase of the reception signal, a converter to output the sine and cosine elements of the reception signal, a sine element adder (326) to add up sine element of each reception signal, and a cosine element adder (325) to add up cosine element of each reception signal. The converter fetches and outputs predetermined values on sine and cosine elements of the reception signal upon input of the reception signal's reception level and phase data that is sent from phase demodulator. Therefore, the present device does not require expensive electronic circuits and can be made of small digital circuits suitable for IC including a memory.
Inventors
- 👤 Toshinori Iinuma
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 07:46
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0837; H04B7/0842; H04B7/0865
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
A diversity reception device for weighting and combining a plurality of reception signals, comprising: a plurality of phase demodulating means for demodulating a phase of a respective one of said plurality of reception signals and outputting phase data consisting of a predetermined number of bits; a converting means, having a first input port which receives said phase data, a second input port which receives a combination coefficient consisting of a predetermined number of bits, a first output port, a second output port, and a storage, for outputting predetermined values stored in a place in said storage specified by a combination of said phase data and said combination coefficient, from said first output port and said second output port upon input of said phase data and said combination coefficient, said predetermined values concerning respectively sine elements and cosine elements corresponding to said plurality of reception signals; a sine elements adding means for adding up said predetermined values output from said first output port; and a cosine element adding means for adding up said predetermined values output from said second output port.
Claim 2
Dependent Claim
85 words
The diversity reception device as defined in CLAIM 1 wherein said plurality of phase demodulating means each comprises: a phase detection means for detecting and outputting a phase of said respective one of said plurality of reception signals; a delay means for delaying, one symbol time, data output from said phase detection means; and a calculation means for calculating a difference between data output from said phase detection means and data output from said delay means, and outputting a result as a phase difference data.
Claim 3
Dependent Claim
175 words
The diversity reception device as defined in CLAIM 2 wherein said converting means comprises: a plurality of first storage means, corresponding to said plurality of reception signals and storing calculation results obtained by a certain calculation on all the combinations of sine of said phase data multiplied by said combination coefficient, for fetching and outputting, upon entering of laid phase data and said combination coefficient, one of said calculation results stored in a place specified by a combination of said phase data as a first address and said combination coefficient as a second address; and a plurality of second storage means, corresponding to said plurality of reception signals and storing calculation results obtained by a certain calculation on all the combinations of cosine of said phase data multiplied by said combination coefficient, for fetching and outputting, upon entering of said phase data and said combination coefficient, one of said calculation results stored in a place specified by a combination of said phase data as a first address and said combination coefficient as a second address.
Claim 4
Dependent Claim
355 words
The diversity reception device as defined in CLAIM 2 wherein said converting means comprises: a first storage means storing calculation results obtained by a certain calculation on all the combinations of sine of said phase data multiplied by said combination coefficient, for fetching and outputting, upon entering of said phase data and said combination coefficient, one of said calculation results stored in a place specified by a combination of said phase data as a first address and said combination coefficient as a second address; a second storage means storing calculation results obtained by a certain calculation on all the combinations of cosine of said phase data multiplied by said combination coefficient, for fetching and outputting, upon entering of said phase data and said combination coefficient, one of said calculation results stored in a place specified by a combination of said phase data as a first address and said combination coefficient as a second address; a phase selecting means containing a plurality of input ports connected to said plurality of phase demodulating means, and an output port connected to said first storage means and to said second storage means, for selecting a piece of phase data according to a certain instruction out of said phase data input to said plurality of input ports, and outputting said piece of phase data to said output port; a combination coefficient selecting means containing a plurality of input ports which receive a plurality of combination coefficients, and an output port connected to said first storage means and to said second storage means, for selecting a combination coefficient according to a certain instruction out of said plurality of combination coefficients input to said plurality of input ports, and outputting said combination coefficient to said output port; and a timing generating means for providing instructions to said phase selecting means and said combination coefficient selecting means so that each of said plurality of reception signals is selected sequentially by time division and that said phase data and said combination coefficient of each of said plurality of reception signals are sent synchronously to said first storage means and said second storage means respectively.
Claim 5
Dependent Claim
59 words
The diversity reception device as defined in CLAIM 4 wherein said first storage means stores calculated results of sine of said phase data multiplied by said combination coefficient raised to a power of 2, and said second storage means stores calculated results of cosine of said phase data multiplied by said combination coefficient raised to the power of 2.
Claim 6
Dependent Claim
174 words
The diversity reception device as defined in CLAIM 5 further comprising: a plurality of comparing means, corresponding to said plurality of reception signals and containing an input port and an output port, for comparing a reception level input to said input port consisting of a predetermined number of bits with a predetermined value, and outputting a result from said outputting port; a plurality of likelihood detecting means, corresponding to said plurality of reception signals, for detecting a distance between said phase data and a decision point, and outputting said distance; and a plurality of outputting means, corresponding to said plurality of reception signals, for outputting said reception level as said combination coefficient if said result output from said plurality of comparing means shows that said reception level is less than said predetermined value, and outputting, as said combination coefficient, a predetermined value based on said distance output from said plurality of likelihood detecting means multiplied by said reception level if said result shows that said reception level is not less than said predetermined value.
Claim 7
Dependent Claim
47 words
The diversity reception device as defined in CLAIM 4 wherein said first storage means stores calculated results of sine of said phase data multiplied by said combination coefficient, and said second storage means stores calculated results of cosine of said phase data multiplied by said combination coefficient.
Claim 8
Dependent Claim
55 words
The diversity reception device as defined in CLAIM 7 further comprising: a plurality of combination coefficient calculating means, corresponding to said plurality of reception signals, for detecting said distance between said phase data and said decision point, and outputting, as said combination coefficient, a value obtained by performing a certain calculation on the detected distance.
References Cited (Backward Citations)
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