Changes between Version 1 and Version 2 of OFDM/MIMO/Docs/ModelSharedMem

Timestamp:

Jan 2, 2007, 11:41:35 PM (18 years ago)

Author:

murphpo

Comment:

--

OFDM/MIMO/Docs/ModelSharedMem

@@ -3 +3 @@
 [wiki:/sysgen2opb sysgen2opb]
 
-== Receive Packet Buffer ==
-=== Address: 0x10000 ===
+= Programmable Modulation Schemes =
+== Transmitter Modulation ==
+=== Address: 0x40000 ===
 
 == Receiver Modulation ==
 === Address: 0x20000 ===
 
+{{{
+#!c
+void setModuation()
+{
+        //The following modulation schemes match the 802.11a/g standard
+        // Each places data on 48 subcarriers
+        // Zeros are inserted at the remaining 16 subcarriers:
+        //   Subcarrier 0 (DC) must always be zero
+        //   Subcarriers 7, 21, -7, -21 are used for pilot tones (i.e. zero data)
+        //   Subcarriers [27:31] and [-32:-27] are zero to meet spectral mask requirements
+
+        //The modulation is specified as a vector with 192 4-bit elements
+        //The indicies below represent the subcarrier index:
+        // x[0:63] specify the full-rate modulation for antenna A
+        // x[64:127] specify the full-rate modulation for antenna B
+        // x[128:191] specify the base-rate modulation
+
+        //When re-cast as a vector of unsigned ints, the subcarrier indicies are mapped like:
+        // [ [7 6 5 4 3 2 1 0] [15 14 13 12 11 10 9 8] [23 22 21 20 19 18 17 16] ...]
+        //Thus, 
+        //  unsigned int modMasks_qpsk[24] = {0x02222220, 0x22222222, 0x22022222 ...
+        //results in zeros at subcarriers 0, 7 and 21...
+
+        //QPSK modulation on 48 subcarriers
+        unsigned int modMasks_qpsk[24] = {0x02222220, 0x22222222, 0x22022222, 0x00000222, 0x22000000, 0x22220222, 0x22222222, 0x22222202, 0x02222220, 0x22222222, 0x22022222, 0x00000222, 0x22000000, 0x22220222, 0x22222222, 0x22222202, 0x02222220, 0x22222222, 0x22022222, 0x00000222, 0x22000000, 0x22220222, 0x22222222, 0x22222202};
+
+        //16-QAM on 48 subcarriers
+        unsigned int modMasks_16qam[24] = {0x04444440, 0x44444444, 0x44044444, 0x00000444, 0x44000000, 0x44440444, 0x44444444, 0x44444404, 0x04444440, 0x44444444, 0x44044444, 0x00000444, 0x44000000, 0x44440444, 0x44444444, 0x44444404, 0x04444440, 0x44444444, 0x44044444, 0x00000444, 0x44000000, 0x44440444, 0x44444444, 0x44444404};
+
+        //64-QAM on 48 subcarriers
+        unsigned int modMasks_64qam[24] = {0x06666660, 0x66666666, 0x66066666, 0x00000666, 0x66000000, 0x66660666, 0x66666666, 0x66666606, 0x06666660, 0x66666666, 0x66066666, 0x00000666, 0x66000000, 0x66660666, 0x66666666, 0x66666606, 0x06666660, 0x66666666, 0x66066666, 0x00000666, 0x66000000, 0x66660666, 0x66666666, 0x66666606};
+
+        unsigned char i;
+
+        for(i=0; i<24; i++)
+        {
+                //Uncomment one of the following lines to select the modulation scheme at the Transmitter
+                *((volatile unsigned int*)(XPAR_OFDM_TXRX_MIMO_OPBW_0_BASEADDR+ofdm_TxRx_mimo_SMWO_TxModulation_OFFSET+i*sizeof(int))) = modMasks_qpsk[i];
+                //*((volatile unsigned int*)(XPAR_OFDM_TXRX_MIMO_OPBW_0_BASEADDR+ofdm_TxRx_mimo_SMWO_TxModulation_OFFSET+i*sizeof(int))) = modMasks_16qam[i];
+                //*((volatile unsigned int*)(XPAR_OFDM_TXRX_MIMO_OPBW_0_BASEADDR+ofdm_TxRx_mimo_SMWO_TxModulation_OFFSET+i*sizeof(int))) = modMasks_64qam[i];
+        }
+
+        for(i=0; i<24; i++)
+        {
+                //Uncomment one of the following lines to select the modulation scheme at the Receiver
+                *((volatile unsigned int*)(XPAR_OFDM_TXRX_MIMO_OPBW_0_BASEADDR+ofdm_TxRx_mimo_SMWO_RxModulation_OFFSET+i*sizeof(int))) = modMasks_qpsk[i];
+                //*((volatile unsigned int*)(XPAR_OFDM_TXRX_MIMO_OPBW_0_BASEADDR+ofdm_TxRx_mimo_SMWO_RxModulation_OFFSET+i*sizeof(int))) = modMasks_16qam[i];
+                //*((volatile unsigned int*)(XPAR_OFDM_TXRX_MIMO_OPBW_0_BASEADDR+ofdm_TxRx_mimo_SMWO_RxModulation_OFFSET+i*sizeof(int))) = modMasks_64qam[i];
+        }
+}
+}}}
+
+== Receive Packet Buffer ==
+=== Address: 0x10000 ===
+
+
 == Transmit Packet Buffer ==
 === Address: 0x30000 ===
 
-== Transmitter Modulation ==
-=== Address: 0x40000 ===