Remove FreeDeviceMemory calls and related Cython bindings

Eliminated FreeDeviceMemory method and its usage from both the Cython interface and simulator_radar.pyx. This simplifies memory management, likely due to changes in the underlying C++ submodule or a refactor in resource handling.

Author: zpeng

src/radarsimcpp

@@ -178,23 +178,6 @@ cdef extern from "points_manager.hpp":
 # Radar transmitter components including antenna patterns and waveform modulation
 #------------------------------------------------------------------------------
 cdef extern from "transmitter.hpp":
-    cdef cppclass TxChannel[T]:
-        TxChannel() except +
-        
-        # Full transmitter channel constructor
-        TxChannel(const Vec3[T] & location,                      # Antenna location
-                  const Vec3[cpp_complex[T]] & polar,            # Polarization vector
-                  const vector[T] & phi,                         # Azimuth angle array
-                  const vector[T] & phi_ptn,                     # Azimuth pattern
-                  const vector[T] & theta,                       # Elevation angle array
-                  const vector[T] & theta_ptn,                   # Elevation pattern
-                  const T & antenna_gain,                        # Antenna gain (dB)
-                  const vector[T] & mod_t,                       # Modulation time array
-                  const vector[cpp_complex[T]] & mod_var,        # Modulation variables
-                  const vector[cpp_complex[T]] & pulse_mod,      # Pulse modulation
-                  const T & delay,                               # Channel delay (s)
-                  const T & grid) except +                       # Time grid resolution
-
     cdef cppclass Transmitter[H, L]:
         Transmitter() except +
 
@@ -231,18 +214,6 @@ cdef extern from "transmitter.hpp":
 # Radar receiver components including antenna patterns and RF/baseband processing
 #------------------------------------------------------------------------------
 cdef extern from "receiver.hpp":
-    cdef cppclass RxChannel[T]:
-        RxChannel() except +
-        
-        # Receiver channel constructor
-        RxChannel(const Vec3[T] & location,                      # Antenna location
-                  const Vec3[cpp_complex[T]] & polar,            # Polarization vector
-                  const vector[T] & phi,                         # Azimuth angle array
-                  const vector[T] & phi_ptn,                     # Azimuth pattern
-                  const vector[T] & theta,                       # Elevation angle array
-                  const vector[T] & theta_ptn,                   # Elevation pattern
-                  const T & antenna_gain) except +               # Antenna gain (dB)
-
     cdef cppclass Receiver[T]:
         Receiver() except +
 
@@ -282,7 +253,6 @@ cdef extern from "radar.hpp":
         void InitBaseband(H *bb_real,                            # Real baseband buffer
                           H *bb_imag) except +                   # Imaginary baseband buffer
         void SyncBaseband() except +                             # Synchronize device memory
-        void FreeDeviceMemory() except +                         # Release GPU memory
 
 #------------------------------------------------------------------------------
 # Simulation Engines

src/radarsimpy/includes/radarsimc.pxd

@@ -391,7 +391,6 @@ cpdef sim_radar(radar, targets, frame_time=None, density=1, level=None, interf=N
         debug)
 
     if err:
-        radar_c.get()[0].FreeDeviceMemory()
         raise_err(err)
 
     radar_c.get()[0].SyncBaseband()
@@ -461,12 +460,6 @@ cpdef sim_radar(radar, targets, frame_time=None, density=1, level=None, interf=N
         else:
             interference = np.asarray(bb_real) + 1j * np.asarray(bb_imag)
 
-        # Clean up interference radar memory
-        interf_radar_c.get()[0].FreeDeviceMemory()
-
-    # Clean up main radar memory
-    radar_c.get()[0].FreeDeviceMemory()
-
     # Return the simulation results as a structured dictionary
     return {
         "baseband": baseband,