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patrick.zou (21) 16 Articles, 5 Replies, 21 Points

Since 4/5/2012 6:12:52 AM, patrick.zou has written 16 articles and participated in 5 conversations.
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patrick.zou

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 Items(16) /2 Next >> Last >| GMSK, I, Q sample normalize 2 372 (3/12/2010 6:15:19 PM) comp.dsphi, I asked this before and still don't quite make it right. Here are the I, Q samples datas I captured from the receiver. I tried 1)revert to binary offset by deducting 65536 if the value is over32767 ...Pat GMSK: how to normalize I, Q sample 8 201 (3/9/2010 1:23:02 AM) comp.dspHi, in GSM, the I, Q sample values received at the tranceiver is between 0 and 65536. I want to verify this by the fact that I^2 + Q^2 =1. I choose the following formula: if I > 32767 choose I - 655...Pat GMSK recover from I, Q sample data 10 207 (2/27/2010 12:42:02 AM) comp.dspHi, Suppose in the GMSK receiver side, I got I & Q sample data. Are the following steps able to recover the original data? 1) calculate sqrt(I) + sqrt(Q) = C(t) to obtain the integrated signals 2) diffe...Pat Is my understanding of gmsk derotation correct? 0 30 (8/12/2009 7:02:11 PM) comp.dspHi, 1) the symbol that is supposed to be transmitted at 0, ie, I channel is actually transmitted at pi/2, and the sine data is transmitted at I channel. If this is correct, can I just treat switch I and Q? ie...Pat GSM datarate from RF to baseband 4 25 (6/1/2009 7:14:05 PM) comp.dspSuppose in GSM RF, one bit is sampled 128 times, will all of those samples enter baseband or decimate to 1 sample per symbol? thanks ...Pat basic question about GMSK derotation 1 42 (5/30/2009 6:37:04 PM) comp.dspHi, GMSK transmits 1 or 0 with +67.7k or -67.7k, and with each symbol, the phase change is pi/2. Now, is that true the receiver just corrolate and able to find out this is 1 or 0 already. why need to derotate...Pat GSM, I, Q receiving rate 2 46 (5/19/2009 7:12:00 PM) comp.dspHi, I have one question how many I, Q samples are generated per symbol? Is one IQ sample generated per symbol time, or a lot more? For GSM, one frame of 4.6ms got 114 samples. and with this get rate of 22k b...Pat gmsk, ROM table 3 41 (5/18/2009 6:18:20 PM) comp.dspHi, The book says signals after shaping filter will address ROM table to construct cos(x(t, a)). why needs the rom table, can I calculate the cos(x(t)) directly? thanks ...Pat gmsk demodulate 0 40 (5/14/2009 10:36:50 PM) comp.dspHi, in GMSK, the received I, Q samples should be reversed by pi/2. Can someone post a few matlab codes how to implement this? Suppose received samples I = {0xaaaa, 0xbbbb, 0xcccc..}, Q = {0x1111, 0x2222, 0x33...Pat NRZ stream data to gaussfir 0 45 (5/14/2009 2:00:17 AM) comp.soft-sys.matlabHi, how to convert an NRZ data stream like [-1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1] so that each symbols contain 8 samples? cause i specify 8 samples per symbol for the gaussfir. Should I descare a larger ...PZ

patrick.zou's replies:
 Items(4) /1 how to reverse a function? 4 47 (9/30/2006 5:11:39 PM) comp.soft-sys.matlablike x[n] = [1+2i, 3+4i, 5+6i], find out x[-n] ...patrick.zou (21) Phase of FFT #2 5 35 (3/6/2009 1:50:53 AM) comp.dspHi, How does Matlab FFT calcuate phase if the real or img are zero? For first 0, it returns zero, second return 90, but 3rd/4th return something weird. any ideas? thanks 0.0000 -0.0000 - 4.0000i 0.000...patrick.zou (21) gmsk, ROM table 3 41 (5/18/2009 6:18:20 PM) comp.dspHi, The book says signals after shaping filter will address ROM table to construct cos(x(t, a)). why needs the rom table, can I calculate the cos(x(t)) directly? thanks ...patrick.zou (21) GSM, I, Q receiving rate 2 46 (5/19/2009 7:12:00 PM) comp.dspHi, I have one question how many I, Q samples are generated per symbol? Is one IQ sample generated per symbol time, or a lot more? For GSM, one frame of 4.6ms got 114 samples. and with this get rate of 22k b...patrick.zou (21)