diff options
| author | Thomas Tsou <tom@tsou.cc> | 2013-10-11 13:49:55 -0400 |
|---|---|---|
| committer | Thomas Tsou <tom@tsou.cc> | 2013-10-18 13:10:17 -0400 |
| commit | c1f7c42a33a1125f8b39f53a1b6e1bae38376857 (patch) | |
| tree | fd79543a262281b4cbf04bfb09f305b95a715dd4 /Transceiver52M/radioInterface.h | |
| parent | 2c282f5e1268146761413a145fd8ae2fb523fa4f (diff) | |
Transceiver52M: Setup dual sample rate transceiver
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>
Diffstat (limited to 'Transceiver52M/radioInterface.h')
| -rw-r--r-- | Transceiver52M/radioInterface.h | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/Transceiver52M/radioInterface.h b/Transceiver52M/radioInterface.h index 2a83417..98d0f9d 100644 --- a/Transceiver52M/radioInterface.h +++ b/Transceiver52M/radioInterface.h @@ -23,8 +23,6 @@ /** samples per GSM symbol */ #define SAMPSPERSYM 4 -#define INCHUNK (625) -#define OUTCHUNK (625) static const unsigned gSlotLen = 148; ///< number of symbols per slot, not counting guard periods @@ -38,7 +36,9 @@ protected: VectorFIFO mReceiveFIFO; ///< FIFO that holds receive bursts RadioDevice *mRadio; ///< the USRP object - + + int mSPSTx; + int mSPSRx; signalVector *sendBuffer; signalVector *recvBuffer; unsigned sendCursor; @@ -54,7 +54,6 @@ protected: RadioClock mClock; ///< the basestation clock! - int sps; ///< samples per GSM symbol int receiveOffset; ///< offset b/w transmit and receive GSM timestamps, in timeslots bool mOn; ///< indicates radio is on |