Diversity reception device
First Claim
1. A diversity reception device for weighting and combining n reception signals, comprising:
- n phase demodulating means for demodulating a phase of a corresponding one of said n reception signals and outputting phase data;
n inphase-element ROMs which each, including a first input port, a second input port, and an output port, prestores cosine elements in places respectively specified by combinations of a weighting factor and phase data, receives said weighting factor through said first input port, receives, through said second input port, said phase data output from a corresponding phase demodulating means, reads a cosine element from a place specified by a combination of said weighting factor and said phase data respectively received through said first input port and said second input port, and outputs said read cosine element through said output port, each of said prestored cosine elements being obtained by an operation using said weighting factor and the cosine of said phase data, and said cosine elements prestored in each of said n inphase-element ROMs corresponding to all combinations of said weighting factor and said phase data;
n quadrature-element ROMs which each, including a first input port, a second input port, and an output port, prestores sine elements in places respectively specified by combinations of said weighting factor and said phase data, receives said weighting factor through said first input port, receives, through said second input port, phase data output from a corresponding phase demodulating means, reads a sine element from a place specified by said combination of said weighting factor and said phase data respectively received through said first input port and said second input port, and outputs said read sine element through said output port, each of said prestored sine elements being obtained by an operation using said weighting factor and the sine of said phase data, and said sine elements prestored in each of said n quadrature-element ROMs corresponding to all combinations of said weighting factor and said phase data;
a cosine element adding means for adding up n cosine elements output from said n inphase-element ROMs respectively corresponding to said n reception signals; and
a sine element adding means for adding up n sine elements output from said n quadrature-element ROMs respectively corresponding to said n reception signals.
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Accused Products
Abstract
A diversity reception device which weights in proportion to the reception level and combines a plurality of reception signals, includes a phase demodulator 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 to add up sine element of each reception signal, and a cosine element adder 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.
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Citations
5 Claims
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1. A diversity reception device for weighting and combining n reception signals, comprising:
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n phase demodulating means for demodulating a phase of a corresponding one of said n reception signals and outputting phase data; n inphase-element ROMs which each, including a first input port, a second input port, and an output port, prestores cosine elements in places respectively specified by combinations of a weighting factor and phase data, receives said weighting factor through said first input port, receives, through said second input port, said phase data output from a corresponding phase demodulating means, reads a cosine element from a place specified by a combination of said weighting factor and said phase data respectively received through said first input port and said second input port, and outputs said read cosine element through said output port, each of said prestored cosine elements being obtained by an operation using said weighting factor and the cosine of said phase data, and said cosine elements prestored in each of said n inphase-element ROMs corresponding to all combinations of said weighting factor and said phase data; n quadrature-element ROMs which each, including a first input port, a second input port, and an output port, prestores sine elements in places respectively specified by combinations of said weighting factor and said phase data, receives said weighting factor through said first input port, receives, through said second input port, phase data output from a corresponding phase demodulating means, reads a sine element from a place specified by said combination of said weighting factor and said phase data respectively received through said first input port and said second input port, and outputs said read sine element through said output port, each of said prestored sine elements being obtained by an operation using said weighting factor and the sine of said phase data, and said sine elements prestored in each of said n quadrature-element ROMs corresponding to all combinations of said weighting factor and said phase data; a cosine element adding means for adding up n cosine elements output from said n inphase-element ROMs respectively corresponding to said n reception signals; and a sine element adding means for adding up n sine elements output from said n quadrature-element ROMs respectively corresponding to said n reception signals. - View Dependent Claims (2, 3, 4, 5)
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Specification