Systems, methods, and devices for communicating in a wireless network are provided. In one aspect, a method for wireless communication is provided. The method includes inserting an indication of a scrambling sequence into a signal field of a first data unit. The signal field occurs before a service field in the first data unit. The method includes scrambling at least a portion of the first data unit based at least on the inserted indication of the scrambling sequence in the signal field of the first data unit. The method includes transmitting the first data unit. The signal field is transmitted at a first data rate and the service field is transmitted at a second data rate greater than the first data rate. The indication of the scrambling sequence comprises either a scrambler seed or one or more parameters indicative of the scrambling sequence.