Patent ID: 7400607
Filing Date: 2008-07-15
Classification: H04L

Abstract:
1. A method of transmitting packet data in a mobile communication system using a hybrid automatic retransmission request (HARQ) scheme and a high-order modulation scheme, comprising: bit-scrambling a plurality of data bits included in a transport block; attaching an error correction code to the bit-scrambled transport block; channel-encoding the error correction code-attached transport block on a per-coding block basis; and modulating the channel-coded transport block and transmitting the modulated transport block; wherein the bit scrambling comprises: summing in a first summation device a predetermined number of selected values of an initial value stored in a shift register device in a first summation device; feeding the sum of the predetermined number of selected values of an initial value to a most significant bit of the shift register device; summing the transport block and the sum of the predetermined number of selected values of an initial value in a second summation device; shifting the bits of the shift register device and feeding a predetermined number of selected values from the shift register device to the first summation device; and continuing to sum the transport block with the sum of the first summation device to output scrambled bits.