Low Complexity Link Adaptatation for LTE/LTE-A Uplink with a Turbo Receiver

A method for link adaptation for an LTE/LTE-A uplink with a turbo SIC receiver, said method comprising the steps of:

• i) determining a precoding matrix index PMI and rank index RI selection for an LTE/LTE-A uplink when precoding of said uplink is enabled, responsive to channel state information of a subcarrier in said uplink, said PMI and RI being determinable for both sub-band precoding and wideband precoding with codeword decoding being jointly determinable with PMI and RI selection;
• ii) determining a decoding order for codewords in said uplink a) when said precoding of said uplink is not enabled and b) if needed when said precoding of said uplink is enabled, responsive to step i), said decoding order being one of enforced from an upper layer by a scheduler or determined on-the-fly, in case of a proportional fairness said scheduler an ordering being to set said decoding order as a reverse order of weights of said proportional fairness or said decoding order being jointly determined with said determining of said PMI and rank selection;
• iii) selecting modulation and coding scheme MCS indices on said uplink according to a hard decision successive interference cancellation signal-to-interference-noise-ratio SIC SINR or a partial hard decision SIC SINR, responsive to step ii), for a codeword in said uplink decoded first, said MCS being assigned according to its minimum mean square error MMSE-SINR and for a codeword decoded second, said MCS being assigned according to its single-user SINR;
• and
• iv) conveying said MCS indices to scheduling at a base station of said uplink for being applied to data transmission in said uplink.