Baseband processors and methods and systems for decoding a received signal having a transmitter or channel induced coupling between bits

A method for decoding a signal received over a channel from a transmitter comprising:

• decoding a received signal having a first bit and a second bit based on a coupling of the first bit to the second bit introduced by at least one of the channel or the transmitter;
• wherein the coupling of the first bit to the second bit is introduced by a modulation scheme used at the transmitter to generate a symbol for transmission including the first bit and the second bit and wherein decoding a received signal having a first bit and a second bit based on a coupling of the first bit to the second bit introduced by at least one of the channel or the transmitter comprises:
• demodulating the received signal to provide demodulator intermediate soft values associated with the first bit and the second bit;
• decoding the received signal to provide decoder intermediate soft value information for the first bit;
• determining whether the decoder intermediate soft value information for the first bit is available;
• generating an output demodulator soft value associated with the second bit based on the decoder intermediate soft value information for the first bit and the demodulator intermediate soft value associated with the second bit if the decoder intermediate soft value information for the first bit is available;
• providing the demodulator intermediate soft value associated with the second bit as the output demodulator soft value associated with the second bit if the decoder intermediate soft value information for the first bit is not available;
• and
• decoding the received signal based on the output demodulator soft value associated with the second bit.

A method for decoding a signal received over a channel from a transmitter comprising:

• decoding a received signal having a first bit and a second bit based on a coupling of the first bit to the second bit introduced by at least one of the channel or the transmitter;
• wherein decoding a received signal having a first bit and a second bit based on a coupling of the first bit to the second bit introduced by at least one of the channel or the transmitter further comprises:
• demodulating the received signal to provide unadjusted soft information associated with the first bit and unadjusted soft information associated with the second bit;
• forward error correction decoding the received signal based on the provided unadjusted soft information associated with the first bit and the provided unadjusted soft information associated with the second bit;
• providing soft information associated with the second bit based on the forward error correction decoding of the first bit and the coupling of the second bit to the first bit to provide adjusted soft information associated with the second bit and providing soft information associated with the first bit based on the forward error correction decoding of the second bit and the coupling of the second bit to the first bit to provide adjusted soft information associated with the first bit;
• and
• forward error correction decoding the first bit and the second bit based on the adjusted soft information associated with the first bit and the second bit.

A method for decoding a signal received over a channel from a transmitter comprising:

• decoding a received signal having a first bit and a second bit based on a coupling of the first bit to the second bit introduced by at least one of the channel or the transmitter;
• wherein decoding a received signal having a first bit and a second bit based on a coupling of the first bit to the second bit introduced by at least one of the channel or the transmitter comprises:
• demodulating the received signal to provide demodulator intermediate soft values associated with the first bit and the second bit;
• storing the demodulator intermediate soft values;
• forward error correction decoding the received signal based on the demodulator intermediate soft values to provide decoder intermediate soft values associated with the first bit and the second bit;
• adjusting the demodulator intermediate soft values based on the decoder intermediate soft values associated with the first bit and the second bit;
• and
• repeating forward error correction decoding the received signal based on the demodulator intermediate soft values to provide decoder intermediate soft values associated with the first bit and the second bit using the adjusted demodulator intermediate soft values.

A method for decoding a signal received over a channel from a transmitter comprising:

• demodulating a received signal having a first bit and a second bit, the second bit having a coupling to the first bit introduce by at least one of the channel or the transmitter, to provide unadjusted soft information associated with the first bit;
• forward error correction decoding the received signal based on the provided unadjusted soft information associated with the first bit;
• providing path independent soft information associated with the second bit based on the forward error correction decoding of the first bit and the coupling of the second bit to the first bit to provide adjusted soft information associated with the second bit;
• and
• wherein forward error correction decoding the received signal based on the provided unadjusted soft information associated with the first bit further comprises the step of forward error correction decoding the received signal based on the adjusted soft information associated with the second bit.

A method for decoding a signal received over a channel from a transmitter comprising:

• demodulating a received signal having a first bit and a second bit, the second bit having a coupling to the first bit introduce by at least one of the channel or the transmitter to provide unadjusted soft information associated with the first bit and unadjusted soft information associated with the second bit;
• forward error correction decoding the received signal based on the provided unadjusted soft information associated with the first bit and the provided unadjusted soft information associated with the second bit;
• providing soft information associated with the second bit based on the forward error correction decoding of the first bit and the coupling of the second bit to the first bit to provide adjusted soft information associated with the second bit and providing soft information associated with the first bit based on the forward error correction decoding of the second bit and the coupling of the second bit to the first bit to provide adjusted soft information associated with the first bit;
• and
• forward error correction decoding the first bit and the second bit based on the adjusted soft information associated with the first bit and the second bit.

A baseband processor for decoding a signal received over a channel from a transmitter comprising:

• a demodulator that demodulates the received signal to provide demodulator soft information associated with a plurality of bits in the received signal;
• an intermediate value memory configured to store the demodulator soft information associated with a plurality of bits in the received signal;
• a soft information generator circuit coupled to the intermediate value memory;
• a decoder configured to process soft information associated with the plurality of bits in the received signal from the soft information generator circuit to provide decoder soft information associated with ones of the plurality of bits in the received signal;
• and
• wherein the soft information generator circuit is configured to generate the soft information associated with the plurality of bits in the received signal based on a coupling of one of the plurality of bits to another of the plurality of bits introduced by at least one of the channel or the transmitter and responsive to the decoder soft information associated with ones of the plurality of bits in the received signal.

A system for decoding a signal received over a channel from a transmitter comprising:

• a receiver configured to receive the signal;
• and
• means for decoding a received signal having a first bit and a second bit based on a coupling of the first bit to the second bit introduced by at least one of the channel or the transmitter;
• and
• wherein the means for decoding a received signal having a first bit and a second bit based on a coupling of the first bit to the second bit introduced by at least one of the channel or the transmitter comprises:
• means for demodulating the received signal to provide unadjusted soft information associated with the first bit;
• means for forward error correction decoding the received signal based on the provided unadjusted soft information associated with the first bit;
• means for providing soft information associated with the second bit based on the forward error correction decoding of the first bit and the coupling of the second bit to the first bit to provide adjusted soft information associated with the second bit;
• and
• wherein the means for forward error correction decoding the received signal further comprises means for forward error correction decoding the received signal based on the adjusted soft information associated with the second bit.

A system for decoding a signal received over a channel from a transmitter comprising:

• a receiver configured to receive the signal;
• and
• means for decoding a received signal having a first bit and a second bit based on a coupling of the first bit to the second bit introduced by at least one of the channel or the transmitter;
• and
• wherein the means for decoding further comprises:
• means for demodulating the received signal to provide unadjusted soft information associated with the first bit and unadjusted soft information associated with the second bit;
• means for forward error correction decoding the received signal based on the provided unadjusted soft information associated with the first bit and the provided unadjusted soft information associated with the second bit;
• means for providing soft information associated with the second bit based on the forward error correction decoding of the first bit and the coupling of the second bit to the first bit to provide adjusted soft information associated with the second bit and providing soft information associated with the first bit based on the forward error correction decoding of the second bit and the coupling of the second bit to the first bit to provide adjusted soft information associated with the first bit;
• and
• means for forward error correction decoding the first bit and the second bit based on the adjusted soft information associated with the first bit and the second bit.

A wireless terminal comprising:

• a receiver that receives a signal over a channel from a transmitter;
• and
• a baseband processor comprising:
• a demodulator that demodulates the received signal to provide demodulator soft information associated with a plurality of bits in the received signal;
• an intermediate value memory configured to store the demodulator soft information associated with a plurality of bits in the received signal;
• a soft information generator circuit coupled to the intermediate value memory;
• a decoder configured to process soft information associated with the plurality of bits in the received signal from the soft information generator circuit to provide decoder soft information associated with ones of the plurality of bits in the received signal;
• and
• wherein the soft information generator circuit is configured to generate the soft information associated with the plurality of bits in the received signal based on a coupling of one of the plurality of bits to another of the plurality of bits introduced by at least one of the channel or the transmitter and responsive to the decoder soft information associated with ones of the plurality of bits in the received signal.