diminish reception of some parts of the signal at the receiver the transmitted signal can be encoded using forward error correction coding techniques which allows the receiver to recover all of the signal information despite some diminished reception such randomization provides time diversity so that receivers can have more consistent performance for broadcasted data where users with the worst channel condition dictates the overall performance having consistent performance across users can improve the overall network performance application_number US 95470504 A description in a tdm scheme a time slot is the minimum transmission unit for data for various purposes it is sometimes desirable to transmit other information in addition to payload data in the same time slot for example a pilot signal can be transmitted to aid the mobile 39 s estimation of the channel fig2 shows an example of tdm structure within a time slot where payload data 120 124 and pilot data 122 are time division multiplexed within the same time slot as shown the payload data is spread into two parts 120 and 124 in this example referring to fig3 a series of five time slots includes some time slots that are used for transmitting unicast data 100 104 and others that are used for transmitting broadcast data 102 106 108 in one implementation a system modulates each block of broadcast data 102 106 108 with a random time varying phase rotation where a different random modulation patterns are used among the sectors in the system and the phase rotation is fixed for the duration of each block referring to fig6 a transmitter includes and outer encoder 200 an interleaver 202 an inner encoder 204 a mapping function f 206 a rotation function.