System and method for coding WCDMA MIMO CQI reports

A user equipment, in a wideband code division multi access (WCDMA) system for reporting Multiple-Input-Multiple-Output (MIMO) channel quality indicators (CQI) and antenna weight indicators (AWI), the user equipment comprising:

• channel and signal-interference-plus noise ratio (SINR) estimator for generating channel quality indicator (CQI) bits and antenna weight indicator (AWI) bits;
• encoder for utilizing a (20,10,6) code to produce a codeword according to a ten bit sequence comprising the CQI bits and AWI bits, wherein the (20,10,6) code has a distance spectrum relative to an all-zero codeword of:
• one codeword, said codeword being the all-zero codeword, having zero Hamming distance;
• 40 codewords having Hamming distance 6;
• 160 codewords having Hamming distance 7;
• 130 codewords having Hamming distance 8;
• 176 codewords having Hamming distance 10;
• 320 codewords having Hamming distance 11;
• 120 codewords having Hamming distance 12;
• 40 codewords having Hamming distance 14;
• 32 codewords having Hamming distance 15;
• and
• 5 codewords having hamming distance 16;
• and
• transmitter for transmitting the produced (20, 10, 6) codeword to a receiver.

A base station in a wideband code division multi access (WCDMA) system, the base station comprising:

• a receiver for receiving and storing Multiple-Input-Multiple-Output (MIMO) channel quality indicators (CQI) and antenna weight indicators (AWI), the receiver comprising:
• a receiver for receiving a signal containing a codeword produced utilizing a (20,10,6) code;
• a processor for processing the received signal to produce twenty soft values, each soft value corresponding to a bit in the (20,10,6) codeword;
• and
• a CQI/AWI decoder for decoding the twenty soft values to recover the CQI bits and the AWI bits and passing the CQI bits to a rate controller and AWI bits to an Antenna Weight controller, wherein the (20,10,6) code has a distance spectrum relative to an all-zero codeword of:
• one codeword, said codeword being the all-zero codeword, having zero Hamming distance;
• 40 codewords having Hamming distance 6;
• 160 codewords having Hamming distance 7;
• 130 codewords having Hamming distance 8;
• 176 codewords having Hamming distance 10;
• 320 codewords having Hamming distance 11;
• 120 codewords having Hamming distance 12;
• 40 codewords having Hamming distance 14;
• 32 codewords having Hamming distance 15;
• and
• 5 codewords having Hamming distance 16.

A system in a wireless communication system comprising:

• a User Equipment (UE) comprising:
• a channel and signal-interference-plus-noise ratio estimator for generating CQI and AWI bits;
• a CQI/AWI encoder utilizing a (20,10,6) code for producing a codeword according to the generated CQI and AWI bits;
• and
• a transmitter for transmitting a signal containing the (20,10,6) codeword;
• and
• a base station comprising:
• a receiver for receiving the signal containing the (20,10,6) codeword;
• a processor for processing the received signal and producing twenty soft values, each of the soft values corresponding to a bit in the (20,10,6) codeword;
• and
• a CQI/AWI decoder for decoding the soft values to recover the CQI and AWI bits and passing the CQI bits to a Rate controller and the AWI bits to an Antenna weight controller, wherein the (20,10,6) code has a distance spectrum relative to an all-zero codeword of:
• one codeword, said codeword being the all-zero codeword, having zero Hamming distance;
• 40 codewords having Hamming distance 6;
• 160 codewords having Hamming distance 7;
• 130 codewords having Hamming distance 8;
• 176 codewords having Hamming distance 10;
• 320 codewords having Hamming distance 11;
• 120 codewords having Hamming distance 12;
• 40 codewords having Hamming distance 14;
• 32 codewords having Hamming distance 15;
• and
• 5 codewords having Hamming distance 16.