Patent ID: 6771705
Filing Date: 2004-08-03
Classification: H04B,H04L

Abstract:
For use in a wireless communications system, a system for turbo encoding with transmit diversity, said system comprising:first and second physically displaced antennas sufficiently spaced to produce substantially independent fading of signals received at a receiving station; a first encoding unit coupled to said first antenna, said first encoding unit receiving systematic data and generating first and second subsets of parity data for said systematic data; a second encoding unit coupled to said second antenna, said second encoding unit receiving interleaved systematic data and generating first and second subsets of parity data for said interleaved systematic data, said first subset of parity data for said systematic data and said first subset of parity data for said interleaved systematic data forming first parity data for transmission via said first antenna, a first antenna processor coupled between said first encoding unit and said first antenna and receiving said systematic data and said first parity data, said first antenna processor coding said systematic data and said first parity data in a first manner for transmission via said first antenna, said first antenna processor logically dividing said first parity data into first and second portions, transmitting said first portion of said first parity data together with said systematic data during a first transmission period, and transmitting said second portion of said first parity data during a second transmission period subsequent to said first transmission period, said second subset of parity data for said systematic data and said second subset of parity data for said interleaved systematic data forming second parity data for transmission via said second antenna, a second antenna processor coupled between said second encoding unit and said antenna and receiving one of said systematic data and said interleaved systematic data, and said second parity data, said second antenna processor coding one of said systematic data and said interleaved systematic data, and second parity data in a second manner substantially orthogonal to said first manner for transmission via said second antenna, said second antenna processor logically dividing said second parity data into first and second portions, transmitting said first portion of said second parity data together with one of said systematic data and said interleaved systematic data during said first transmission period, and transmitting said second portion of said second parity data during said second transmission period, wherein either one of said first parity data or said second parity data may be employed without an other of said first parity data or said second parity data for error correction in decoding said systematic data.