does scrambling increse the bandwidth In LTE systems the in the scrambling section, a gold sequence is used. But I've studied that gold sequences are used in spread spectrum communication. This generally increases the bandwidth. So doesn't this mean that scrambling results in an increase of bandwidth.?

regards,
phani tej
No, scrambling does not increase the bandwidth.  Scrambling does even out the bandwidth, such that the power is spread evenly over the signal bandwidth.

You are thinking of chipping, which is used in DSSS systems.  Scrambling and chipping are different processes.