SYMBOL INVERSION TECHNIQUE FOR DC BALANCING DIGITAL DATA
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-14
In digital data transmission systems, it is generally desirable to have DC balanced data (equal number of "ones" and "zeroes"). Tbis is often accomplished by some encryption or randomizer scheme. When random or pseudo-random sequences are used however, the trans- mit and receive processes must be synchronized at all times. Sync information must be sent at the start of a transmission and also periodically throughout the mes- sage because receivers may lose sync or miss the begin- ning of the message. Additional channel capacity is needed for sending this information as well as proces- sor resources to manage synchronization. In order to avoid the complexities of these methods, a simple sym- bol inversion technique can be used to provide the same level of DC balancing.