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Request for Assistance with CFR Pulse File and Threshold Settings for BW 50MHz 5GNR Signal

		
	
				

			

									
					    PaulJung
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jul 15, 2024 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Software

    		        		            		    
Product Number:  ADRV9029  

    		        		        		        
Software Version: SW6.4.0.19

    		    		    

		    		    
		    			

			    
Hello ADI team,


Based on your advice regarding the question below, I applied a BW 50MHz 5GNR signal at a Tx data rate of 122.88Msps.


 RE: Inquiry Regarding DPD Usage with Tx Data Rate Below 122.88MSPS 


I created and used the attached CFR Pulse file for the test.







    

        Fullscreen
        CFR_pulse_50M_30k_122p88_osr1.txt
        Download
    

    
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
1 0
1 0
0 0
-1 0
0 0
1 0
1 0
0 0
-2 0
-1 0
1 0
2 0
0 0
-3 0
-2 0
2 0
4 0
1 0
-4 0
-4 0
2 0
5 0
2 0
-4 0
-5 0
1 0
7 0
4 0
-5 0
-8 0
0 0
8 0
6 0
-5 0
-10 0
-2 0
10 0
9 0
-5 0
-13 0
-4 0
11 0
12 0
-3 0
-16 0
-7 0
12 0
16 0
-1 0
-18 0
-12 0
11 0
21 0
2 0
-20 0
-17 0
10 0
25 0
7 0
-22 0
-22 0
7 0
29 0
13 0
-22 0
-29 0
3 0
33 0
19 0
-21 0
-35 0
-2 0
36 0
27 0
-19 0
-42 0
-10 0
37 0
36 0
-14 0
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37 0
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-8 0
-53 0
-29 0
36 0
55 0
1 0
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31 0
65 0
12 0
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25 0
73 0
25 0
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15 0
81 0
40 0
-56 0
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86 0
57 0
-50 0
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-14 0
89 0
76 0
-40 0
-107 0
-32 0
89 0
95 0
-26 0
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-54 0
84 0
114 0
-9 0
-125 0
-78 0
76 0
133 0
13 0
-129 0
-103 0
63 0
151 0
39 0
-129 0
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44 0
166 0
69 0
-124 0
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20 0
177 0
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184 0
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216 0
-38 0
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255 0
3 0
-263 0
-185 0
146 0
293 0
52 0
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113 0
329 0
110 0
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-299 0
70 0
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177 0
-253 0
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32767 0
25174 0
8553 0
-4515 0
-6575 0
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3890 0
2883 0
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258 0
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205 0
801 0
335 0
-530 0
-663 0
61 0
664 0
381 0
-375 0
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-47 0
543 0
404 0
-248 0
-547 0
-127 0
436 0
410 0
-143 0
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-186 0
340 0
403 0
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254 0
386 0
13 0
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177 0
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70 0
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52 0
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255 0
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186 0
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184 0
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102 0
177 0
20 0
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69 0
166 0
44 0
-130 0
-129 0
39 0
151 0
63 0
-103 0
-129 0
13 0
133 0
76 0
-78 0
-125 0
-9 0
114 0
84 0
-54 0
-117 0
-26 0
95 0
89 0
-32 0
-107 0
-40 0
76 0
89 0
-14 0
-94 0
-50 0
57 0
86 0
2 0
-81 0
-56 0
40 0
81 0
15 0
-67 0
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25 0
73 0
25 0
-54 0
-59 0
12 0
65 0
31 0
-41 0
-57 0
1 0
55 0
36 0
-29 0
-53 0
-8 0
46 0
37 0
-19 0
-48 0
-14 0
36 0
37 0
-10 0
-42 0
-19 0
27 0
36 0
-2 0
-35 0
-21 0
19 0
33 0
3 0
-29 0
-22 0
13 0
29 0
7 0
-22 0
-22 0
7 0
25 0
10 0
-17 0
-20 0
2 0
21 0
11 0
-12 0
-18 0
-1 0
16 0
12 0
-7 0
-16 0
-3 0
12 0
11 0
-4 0
-13 0
-5 0
9 0
10 0
-2 0
-10 0
-5 0
6 0
8 0
0 0
-8 0
-5 0
4 0
7 0
1 0
-5 0
-4 0
2 0
5 0
2 0
-4 0
-4 0
1 0
4 0
2 0
-2 0
-3 0
0 0
2 0
1 0
-1 0
-2 0
0 0
1 0
1 0
0 0
-1 0
0 0
1 0
1 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0








The results are shown in the image below (iBW 50MHz, TM1.1).


 


  


Looking at the image above, could you advise whether there is an issue with the CFR Pulse file or with the CFR threshold? Any suggestions would be appreciated.


Additionally, I set the OSR to 1, but could you also let me know how to use the OSR for DPD? Thank you.


If there is an issue with the CFR Pulse file, could you generate a new CFR Pulse file and send it to me?


    

  • BW 50MHz (CF +/-25MHz)
    • 

  • SCS 30KHz
    • 

  • Data rate 122.88Msps
    • 



Please let me know if you need any additional information regarding my request.


Thanks,
Paul

			

			
									    

			        
Edit Notes

    				..

[edited by: PaulJung at 2:45 AM (GMT -4) on 16 Jul 2024]
				

						
		                             
                        

    

                                            
                 software
                
                                                    
                 SW6.4.0.19
                
                                                    
                 ADRV9029
                
                                                    
                 cfr-pulse-generation
                
                                                    
                 dpd
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
                    Show More
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 16, 2024 12:45 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    PaulJung said:
    Looking at the image above, could you advise whether there is an issue with the CFR Pulse file or with the CFR threshold? Any suggestions would be appreciated.
    

    Are you getting the expected PAR? It looks like the ACLR was degraded, are you using Hard clipper?, if so, the Hard clipper threshold should be <= CFR peak threshold.
    

    What is the ACLR and PAR before applying CFR? What is the RMS signal level and peak threshold used?
    

    Have you configured OSR of 1 in CFR configuration as well?
    

    I have generated the pulse with 122.88xosr 4 for NR50MHz. Please configure accordingly and test for CFR.
    

    



    
    
    
        Fullscreen
        3223.NR50M_pulse_122P88Mxosr4.txt
        Download
    
    
    
    2 0
4 0
7 0
12 0
17 0
23 0
29 0
36 0
43 0
49 0
54 0
57 0
58 0
57 0
53 0
46 0
37 0
25 0
12 0
-2 0
-16 0
-30 0
-42 0
-51 0
-57 0
-59 0
-57 0
-51 0
-42 0
-28 0
-13 0
4 0
20 0
36 0
48 0
58 0
63 0
63 0
58 0
48 0
34 0
18 0
-1 0
-19 0
-37 0
-51 0
-62 0
-67 0
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-61 0
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-35 0
-16 0
4 0
24 0
43 0
58 0
68 0
73 0
71 0
63 0
50 0
32 0
11 0
-12 0
-33 0
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-63 0
-46 0
-24 0
0 0
24 0
46 0
65 0
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84 0
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74 0
58 0
37 0
13 0
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-79 0
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-91 0
-85 0
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-50 0
-25 0
3 0
32 0
57 0
78 0
92 0
98 0
95 0
83 0
63 0
37 0
7 0
-23 0
-53 0
-77 0
-95 0
-104 0
-104 0
-94 0
-76 0
-50 0
-19 0
15 0
47 0
75 0
97 0
110 0
113 0
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88 0
62 0
30 0
-5 0
-41 0
-73 0
-99 0
-116 0
-122 0
-117 0
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-76 0
-43 0
-5 0
34 0
70 0
99 0
121 0
131 0
128 0
114 0
89 0
55 0
16 0
-26 0
-65 0
-100 0
-125 0
-139 0
-140 0
-128 0
-103 0
-69 0
-28 0
17 0
61 0
99 0
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141 0
118 0
83 0
40 0
-7 0
-55 0
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-132 0
-154 0
-162 0
-155 0
-133 0
-98 0
-54 0
-3 0
48 0
96 0
135 0
162 0
174 0
169 0
149 0
114 0
68 0
15 0
-41 0
-93 0
-137 0
-169 0
-185 0
-184 0
-165 0
-131 0
-83 0
-27 0
32 0
89 0
139 0
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199 0
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41 0
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-56 0
11 0
79 0
140 0
188 0
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230 0
219 0
187 0
137 0
73 0
1 0
-72 0
-139 0
-194 0
-231 0
-246 0
-238 0
-208 0
-157 0
-91 0
-15 0
64 0
137 0
199 0
242 0
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258 0
230 0
179 0
110 0
30 0
-54 0
-135 0
-203 0
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-279 0
-280 0
-253 0
-202 0
-131 0
-46 0
44 0
131 0
207 0
264 0
297 0
301 0
278 0
227 0
154 0
65 0
-31 0
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-210 0
-275 0
-314 0
-324 0
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17 0
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333 0
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103 0
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37 0
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340 0
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429 0
304 0
149 0
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639 0
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162 0
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754 0
678 0
534 0
337 0
103 0
-145 0
-384 0
-590 0
-744 0
-829 0
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-763 0
-615 0
-404 0
-150 0
123 0
390 0
626 0
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709 0
484 0
207 0
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-982 0
-822 0
-580 0
-276 0
62 0
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1122 0
1180 0
1125 0
960 0
698 0
362 0
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-1062 0
-1263 0
-1348 0
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-848 0
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-38 0
411 0
835 0
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615 0
114 0
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-1844 0
-1660 0
-1307 0
-813 0
-220 0
419 0
1043 0
1593 0
2012 0
2252 0
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2095 0
1692 0
1103 0
378 0
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-1221 0
-1944 0
-2516 0
-2873 0
-2969 0
-2779 0
-2304 0
-1572 0
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423 0
1516 0
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3384 0
3961 0
4191 0
4023 0
3441 0
2461 0
1142 0
-425 0
-2114 0
-3779 0
-5259 0
-6390 0
-7023 0
-7027 0
-6310 0
-4821 0
-2559 0
426 0
4029 0
8101 0
12454 0
16872 0
21125 0
24985 0
28240 0
30706 0
32245 0
    

    


    

    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 16, 2024 3:11 AM
            
            
												
						in reply to Ramarao
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hello Ramarao,
    

    I tested with the pulse file. It looks fine with EVM and CCDF.
    But nothing has improved in ACLR.
    

     
    

     
    

     
    

    The configurations for CFR:
    

    cfrMode = 0,
cfrTxDelay = 511, 
cfrPeakThreshold = 0.48,
cfrEngine1PeakThresholdScaler = 0.98, 
cfrEngine2PeakThresholdScaler = 0.985,
cfrEngine3PeakThresholdScaler = 0.99,
cfrCorrectionThresholdScaler = 0.98,
cfrInterpolationFactor = 2,
cfrEngine1MaxNumOfPeaks = 5, 
cfrEngine2MaxNumOfPeaks = 5,  
cfrEngine3MaxNumOfPeaks = 5
cfrEngine1Enable = 1,
cfrEngine1BypassEnable = 0,
cfrEngine2Enable = 1,
cfrEngine2BypassEnable = 0, 
cfrEngine3Enable = 1,
cfrEngine3BypassEnable = 0
cfrHardClipperEnable = 1,
cfrHardClipperThreshold = 0.55
    

    Please review.
    

    Regards,
    Jake
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 16, 2024 7:09 AM
            
            
												
						in reply to JakeJang
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Are you testing with PA or just the Transceiver Tx out? How is the ACLR before applying CFR?
    

    Test just at the Tx out of transceiver.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 17, 2024 12:20 AM
            
            
												
						in reply to Ramarao
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    I'm testing with PA. As there is no issue with 100M bandwidth, I don't need to test without PA.
    Do you think I should test without PA? 
    

    I turned off/on CFR and the ACLR is not changed.
    

     
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 17, 2024 12:38 AM
            
            
												
						in reply to JakeJang
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    If you are testing with PA, you need to make sure that you test at back off from its rated power so that the Peak clipping comes from CFR and not from PA peak compression.
    

    Please test without PA and make sure that the CFR works as expected.
    

    JakeJang said:
    I turned off/on CFR and the ACLR is not changed.
    

    This is what expected. Due to CFR, ACLR should not have any impact other than peak clipping.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 17, 2024 1:35 AM
            
            
												
						in reply to Ramarao
					
										
			            		
    
		
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    I tested without PA, and got follow results:
    

     
    

     
    

     
    

    Please review.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 17, 2024 1:42 AM
            
            
												
						in reply to JakeJang
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    I can see PAR as expected from CCDF plot. Why is ACLR bad? Before applying CFR, how is the ACLR?
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 17, 2024 2:00 AM
            
            
												
						in reply to Ramarao
					
										
			            		
    
		
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    I tested without PA and CFR. Only DPD is enabled.
    

     
    

     
    

     
    

    ACLR is bad, too.
    

    Please review.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 17, 2024 2:40 AM
            
            
												
						in reply to JakeJang
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Please disable DPD as well. My point is before applying CFR and after applying CFR, the ACLR should not be impacted.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 17, 2024 2:59 AM
            
            
												
						in reply to Ramarao
					
										
			            		
    
		
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    I tested without DPD, CFR & PA.
    

     
    

     
    

     
    

    It's same results.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 17, 2024 3:10 AM
            
            
												
						in reply to JakeJang
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    The ACLR at Transceiver TX out is very bad and is about ~-41Bc. You may have to add additional filtering in the FPGA or the waveform may be bad. You wont get ACLR better than ~-41dBc even with DPD as the BB input itself is bad and having ~-41dBc ACLR.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 18, 2024 8:24 PM
            
            
												
						in reply to Ramarao
					
										
			            		
    
		
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    After issues fixed in FPGA, ACLR become OK.
    

    However the CCDF is not OK.
    

     
    

    With 100MHz bandwidth, there is no issue on CCDF.
    

    cfrMode = 0,
cfrTxDelay = 511, 
cfrPeakThreshold = 0.48,
cfrEngine1PeakThresholdScaler = 0.98, 
cfrEngine2PeakThresholdScaler = 0.985,
cfrEngine3PeakThresholdScaler = 0.99,
cfrCorrectionThresholdScaler = 0.98,
cfrInterpolationFactor = 2,
cfrEngine1MaxNumOfPeaks = 5, 
cfrEngine2MaxNumOfPeaks = 5,  
cfrEngine3MaxNumOfPeaks = 5
cfrEngine1Enable = 1,
cfrEngine1BypassEnable = 0,
cfrEngine2Enable = 1,
cfrEngine2BypassEnable = 0, 
cfrEngine3Enable = 1,
cfrEngine3BypassEnable = 0
cfrHardClipperEnable = 1,
cfrHardClipperThreshold = 0.55
    

    Do I need to change the above settings depending on bandwidth changes? So what values ​​should I change?
    

    Regards,
    Jake
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 19, 2024 2:19 AM
            
            
												
						in reply to JakeJang
					
										
			            		
    
		
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    The RMS signal level would have reduced, please reduce the CFR Peak threshold and test it.
    

    Also, the Info BW in SA should be same as that of the input signal BW.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 19, 2024 4:01 AM
            
            
												
						in reply to Ramarao
					
										
			            		
    
		
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    Hello Ramarao,
    

    Thank you so much. Now I got fine CCDF.
    

    By the way, can I also get pulse files for 10/20/40M bandwidth?
    

    Regards,
    Jake
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 19, 2024 5:40 AM
            
            
												
						in reply to JakeJang
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Please follow the below link and generate the CFR pulse files as required.
    

     CFR Pulse Generation 
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 21, 2024 10:32 PM
            
            
												
						in reply to Ramarao
					
										
			            		
    
		
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    Unfortunately, I don't have matlab license.
    

    So I tried with octave of GNU, but got follow error:
    

    error: 'quantizer' undefined near line 62, column 5
error: called from
    cfr_outputcorrectpulse at line 62 column 3
    ex_gen_correct_pulse at line 79 column 9
    

    Could you change the code for octave?
    

    Regards,
    Jake
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 22, 2024 4:49 AM
            
            
												
						in reply to JakeJang
					
										
			            		
    
		
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    If you able to generate the pulse, you can ignore these errors.
    

    Please see below for the CFR pulse files.
    

    



    
    
    
        Fullscreen
        NR20M_pulse_122P88Mxosr4.txt
        Download
    
    
    
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29056 0
30015 0
30841 0
31527 0
32066 0
32455 0
32690 0
    

    





    
    
    
        Fullscreen
        NR10M_pulse_122P88Mxosr4.txt
        Download
    
    
    
    3 0
3 0
2 0
1 0
0 0
-2 0
-4 0
-7 0
-11 0
-15 0
-20 0
-26 0
-33 0
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31527 0
32066 0
32455 0
32690 0
    

    





    
    
    
        Fullscreen
        NR40M_pulse_122P88Mxosr4.txt
        Download
    
    
    
    3 0
3 0
2 0
1 0
0 0
-2 0
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-26 0
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