Wireless communication system mapping data bits to symbol bit positions according to error rates of those bit positions and data content

摘要

A transmitter-receiver pair encode data as transmitted symbols according to knowledge about variations in noise immunity between different bit positions of the symbols as a decoded. High usefulness data may be preferentially encoded at those bit positions having greatest noise immunity to improve transmission effectiveness.

主权项

1. A wireless transmitter for transmitting data elements having multi-bit data units distinct from error detection data, the wireless transmitter comprising:
a physical transmitter transmitting symbols characterized by one or more parameters of a transmitted wireless signal that together define a constellation of symbols each mapping to the multi-bit data units under an encoding system, bits of the multi-bit data units having bit positions; a prioritizer dividing received multi-bit data units of received data elements into at least two categories of high and low usefulness, the prioritizer changing the division with different multi-bit data units based on a pre-determinable and changing usefulness of the multi-bit data units to a consumer of the data elements; and interleaver receiving the multi-bit data units as divided into high and low usefulness and creating mixed multi-bit data units incorporating both high usefulness bits from high usefulness data units and low usefulness bits from low usefulness data units; an encoder mapping the mixed multi-bit data units to symbols and providing the symbols to the physical transmitter for transmission according to the encoding system; wherein the interleaver and encoder cooperate to map high usefulness bits to bit positions of symbols having lower date error rates and to map low usefulness bits to bit positions of symbols having higher bit error rates under the encoding system, wherein given symbols having lower data error rates are those having fewer contiguous symbols in the symbol constellation and given symbols having higher data error rates are those having more contiguous symbols in the symbol constellation.