Hi All, PN-sequence and orthogonal sequences (e.g. WH codes) are used for different purposes. I understand that, typically, PN-sequences have low auto-correlation which is good for synchronization but unfortunately have higher cross- correlation bad for multiple access (like in CDMA case) On the other hand, orthogonal sequences have low cross correlation properties (zero in the time synchronized case) but suffer high auto correlation. Since PN sequence can be easily generated. Can one generate a near orthogonal pn-sequence(s) for a given LSFR with polynomial? Just for sake of discussion, take an example as 256 sample PN sequence generated using polynomial says X^8+X^6+X^5+X^4+1. How can we generate a near orthogonal sequence from this original PN sequence? Any ideas will be very much appreciated. Thank you Best, Sutter
Generating "Orthogonal" Sequences from a PN sequence
Started by ●March 26, 2009
Reply by ●March 26, 20092009-03-26
suterr@gmail.com wrote:> Hi All, > > PN-sequence and orthogonal sequences (e.g. WH codes) are used for > different purposes.[...]> How can we generate a near orthogonal sequence from this original PN > sequence?P. Fan, M. Darnell. �Sequence design for communications applications� ISBN 0-471-96557 Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com