EDGE: Setup variable sampling on receive path

Allow setting the device to non single SPS sample rates - mainly
running at 4 SPS as the signal processing library does not support
other rates. Wider bandwith support is required on the receive path
to avoid 8-PSK bandlimiting distortion for EDGE.

Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
diff --git a/Transceiver52M/radioInterface.h b/Transceiver52M/radioInterface.h
index b359cbd..ce06578 100644
--- a/Transceiver52M/radioInterface.h
+++ b/Transceiver52M/radioInterface.h
@@ -87,7 +87,8 @@
 
   /** constructor */
   RadioInterface(RadioDevice* wRadio = NULL,
-                 size_t sps = 4, size_t chans = 1, size_t diversity = 1,
+                 size_t tx_sps = 4, size_t rx_sps = 1,
+		 size_t chans = 1, size_t diversity = 1,
                  int receiveOffset = 3, GSM::Time wStartTime = GSM::Time(0));
 
   /** destructor */