DEPENDENCE OF BER/Q FACTOR ON PSEUDO RANDOM & USER DEFINED SEQUENCE GENERATORS
HI EVERYBODY
I WOULD LIKE TO KNOW , IS BER DEPENDENT ON TYPE OF SEQUENCE GENERATORS(PSEUDO RANDOM OR USER DEFINED ) WE ARE USING? I HAVE DESIGNED AN CIRCUIT .IN THAT CIRCUIT IF I CHANGE USER DEFINED SEQ GENERATOR WITH PSEUDO RANDOM SEQ GENERATOR BER ALSO CHANGES.WHY IS IT SO?
SINCE PSEUDO RANDOM BITS ARE NOTHING BUT RANDOM NUMBER GENERATOR(UNPREDICTABLE NUMBER GENERATOR) AND PSEUDO RANDOM NUMBER CAN SOMETIMES BE SAME AS USER DEFINED BITS(LET US ASSUME THAT PSEUDO GENERATOR GENERATES SAME SEQ AS USER DEFINED SEQUENCE).IN THIS CASE BER SHOULD BE SAME BECAUSE BOTH GENERATES SAME NUMBER SEQUENCE…THEN WHY BER IS DEPENDENT ON TYPE OF SEQUENCE GENERATOR?
Responses (3):
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HI EVERYBODY
I WOULD LIKE TO KNOW , IS BER DEPENDENT ON TYPE OF SEQUENCE GENERATORS(PSEUDO RANDOM OR USER DEFINED ) WE ARE USING? I HAVE DESIGNED AN CIRCUIT .IN THAT CIRCUIT IF I CHANGE USER DEFINED SEQ GENERATOR WITH PSEUDO RANDOM SEQ GENERATOR BER ALSO CHANGES.WHY IS IT SO?
SINCE PSEUDO RANDOM BITS ARE NOTHING BUT RANDOM NUMBER GENERATOR(UNPREDICTABLE NUMBER GENERATOR) AND PSEUDO RANDOM NUMBER CAN SOMETIMES BE SAME AS USER DEFINED BITS(LET US ASSUME THAT PSEUDO GENERATOR GENERATES SAME SEQ AS USER DEFINED SEQUENCE).IN THIS CASE BER SHOULD BE SAME BECAUSE BOTH GENERATES SAME NUMBER SEQUENCE…THEN WHY BER IS DEPENDENT ON TYPE OF SEQUENCE GENERATOR? -
Hi vipul, actually from theory of information transmission BER can be dependent on particular sequence, i.e. long series of “0” and “1” can induce jitter in your system, and, hence, reduce your BER. Besides, clock signal can be lost after long series of “0”.
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Here is a paper which can give you a brief explanation about this topic. For deeper understanding I’d recommend Agrawal.
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By the way, can you also provide the sequencies you are using and the results you are getting?
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