Correlator receiver
First Claim
Patent Images
1. A correlation receiver comprising:
- an input signal;
a spread sequence being a pseudonoise (“
PN”
) sequence; and
a filtering means for filtering said spreading sequence, wherein alternating intervals of said pseudonoise sequence are applied to said filtering means to generate filtered intervals, said intervals being less than or equal to one bit in length, thereby interpolating said intervals up to a fixed oversampling ratio OSR=N;
said filtered intervals are then correlated with said input signal; and
said correlation is sent to an output means.
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Abstract
The present invention relates generally to receivers in DS-CDMA receivers, and more particularly to the need for providing a pulse-matched filter to eliminate interchip interference. A CDMA RAKE receiver is used. Instead of applying a pulse-matched filter to the input signal as in state of the art systems, a one-bit pulse-matched filter is applied to the spreading sequence, preferably a pseudonoise (PN) sequence, which interpolates up to the required oversampling ratio. Since the filter has a one-bit input, the multipliers can be replaced by adders which consume less power. Also, the number of adders does not increase with the oversampling ratio as do the number of multipliers in the prior art.
32 Citations
6 Claims
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1. A correlation receiver comprising:
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an input signal;
a spread sequence being a pseudonoise (“
PN”
) sequence; and
a filtering means for filtering said spreading sequence, wherein alternating intervals of said pseudonoise sequence are applied to said filtering means to generate filtered intervals, said intervals being less than or equal to one bit in length, thereby interpolating said intervals up to a fixed oversampling ratio OSR=N;
said filtered intervals are then correlated with said input signal; and
said correlation is sent to an output means. - View Dependent Claims (2, 3)
said correlation is performed using a correlation adding means and said correlation from each of said correlation adding means is sent to said output means.
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4. A correlation receiver comprising:
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an input signal;
a spread sequence being a pseudonoise (“
PN”
) sequence; and
a filtering means for filtering said spreading sequence, wherein said filtering means being a storing means and a number of adding means in said filtering means is reduced by storing, in said storing means, multiple filter responses corresponding to short PN sequences. - View Dependent Claims (5)
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6. A correlation receiver comprising:
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an input signal;
a spread sequence being a pseudonoise (“
PN”
) sequence; and
a filtering means for filtering said spreading sequence, wherein a bit clock which sends a dump signal to two registers Z−
1, one register corresponding to said filtering means, said dump signal being sent at either the positive or negative edge of the bit clock, and said dump signal setting the contents of said two registers to zero.
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Specification
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- Resources
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Current AssigneeOptis Wireless Technology, LLC (Brevet Capital)
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Original AssigneeTelefonaktiebolaget LM Ericsson
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InventorsHellberg, Richard
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Primary Examiner(s)Corrielus, Jean
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Application NumberUS09/330,003Time in Patent Office1,033 DaysField of Search375/130, 375/135, 375/136, 375/140, 375/141, 375/142, 375/146, 375/147, 375/148, 375/149, 375/150, 375/247, 370/320, 370/335, 370/342, 370/441, 341/143, 341/155, 348/606, 708/300, 708/314US Class Current375/150CPC Class CodesH04B 1/709 Correlator structureH04B 1/7093 Matched filter typeH04B 1/7115 Constructive combining of m...
