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Transceiver52M: Setup dual sample rate transceiver

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This patch applies oversampling, when selected with 4 sps,
to the downlink only, while running the receiver with
minimal sampling at 1 sps. These split sample rates allow
us to run a highly accurate downlink signal with minimal
distortion, while keeping receive path channel filtering
on the FPGA.

Without this patch, we oversample the receive path and
require a steep receive filter to get similar adjacent
channel suppression as the FPGA halfband / CIC filter
combination, which comes with a high computational cost.

Signed-off-by: Thomas Tsou <tom@tsou.cc>

git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6747 19bc5d8c-e614-43d4-8b26-e1612bc8e597
This commit is contained in:
Thomas Tsou
2013-10-17 06:19:05 +00:00
parent 8652b22386
commit 22bc28edc4
10 changed files with 229 additions and 162 deletions
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8
Transceiver52M/sigProcLib.h
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@@ -144,14 +144,6 @@ signalVector *convolve(const signalVector *a,
unsigned len = 0,
unsigned step = 1, int offset = 0);
/**
Generate the GSM pulse.
@param sps The number of samples per GSM symbol.
@param symbolLength The size of the pulse.
@return The GSM pulse.
*/
void generateGSMPulse(int sps, int symbolLength);
/**
Frequency shift a vector.
@param y The frequency shifted vector.