Patent ID: 7570698
Filing Date: 2009-08-04
Classification: H04B,H04L

Abstract:
1. A multicarrier transmitter for transmitting at least first and second spatial streams comprising: a bit-grouping shifter to shift symbol-bit groupings of the second spatial stream among subcarriers of a multicarrier communication signal; and a bit-position permuter to rotate bits among bit positions within subgroupings of the symbol-bit groupings of the second spatial stream, wherein the first and second spatial streams comprise distinct data streams, wherein symbol-bit groupings of the first stream are modulated for transmission through a first spatial channel without shifting symbol bit groupings of the first stream and without rotating bits among bit positions, and wherein the symbol-bit groupings of the second spatial stream are modulated for transmission through a second spatial channel after shifting by the bit-grouping shifter and after rotating by the bit-position permuter.