METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING BIT INTERLEAVED CODED MODULATION SIGNAL

摘要

A transmitter for generating a transmit signal comprises a forward error correction encoder (202) for generating a first number of code bits from a second number of information bits, the first number being larger than the second number, a ratio between the second number and the first number defining a code ratio; a mapper (212) for mapping a group of code bits to a transmit symbol, the group of code bits including at least three codes, wherein a sequence of transmit symbols represent the transmit signal, wherein the mapper is operative to map in accordance with a constellation diagram having a plurality of constellation points, each constellation point corresponding to a transmit symbol, and wherein at least two different possible groups of code bits correspond to the same constellation point, and wherein the at least two different possible groups of code bits have at least two primary bits at mutual corresponding positions in the groups, which are identical to each other and at least one secondary bit, at a mutual corresponding position which is different in the two groups of bits.