Patent ID: 8498357

Claim:
A receiving apparatus for an Interleaver Division Multiple Access (IDMA) system, the apparatus comprising: a channel estimator for estimating a channel using a multi-user signal received through at least one RX antenna; an estimator for estimating the noise power and the signal power for each transmission layer of each user by using the estimated channel value from the channel estimator; and a determiner for determining the number of transmission layers for each user and an Modulation and Coding Scheme (MCS) level for each transmission layer of each user by using the signal power and the noise power estimated by the estimator, wherein the multi-user signal includes multiple user signals being interleaved in different interleaving schemes with each other, wherein the determiner comprises a preliminary determiner for preliminarily determining the number of transmission layers and the MCS level for each transmission layer on a user-by-user basis on the basis of a Signal-to-Noise Ratio (SNR) with respect to each of users that gain multiple access in different interleaving schemes, and wherein the preliminary determiner calculates a data rate R t for selection of t transmission layers by using Equation (1) or Equation (2) depending on a structure of a corresponding transmitter R t = t · MCS ( ∑ l = 1 t ⁢ ⁢ P k , l / t ⁢ ⁢ σ 2 ) ( 1 ) R t = ∑ l = 1 t ⁢ ⁢ MCS ⁡ ( P k , l t ⁢ ⁢ σ 2 ) ( 2 ) where P k,l denotes the signal power for the l th transmission layer of the k th user, σ 2 denotes noise power, and MCS( )denotes a function for calculating a data rate depending on the MCS level.