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In this paper, we propose a IDMA system with relays. We describe the system model and the detection algorithm of the destination. The detection algorithm is based on the chip-by-chip detection algorithm. The proposed system raise no burden to the mobiles and needs very simple relays. Simulation results shows that the proposed system does a role of a multiple access scheme and obtains the diversity...
In this paper, we propose a novel detection algorithm for the elementary signal estimator of an IDMA system considering channel estimation error. To develop the algorithm, we derive new probability density function of decision variable reflecting channel estimation error and modify the conventional algorithm based on it. Through computer simulations, it is shown that the proposed algorithm achieves...
In this paper, we propose a new design method of interleavers for interleave-division multiple access (IDMA) system, 2-dimension interleavers. Through a same interleaving rule Gamma, we scramble the row indices and column indices of a traditional block interleaving matrix, and obtain an interleaver. We mark this interleaver as master interleaver. Different interleavers are generated by circular shifting...
In this paper, we propose a downlink transmission and receiving scheme for interleave-division multiple access (IDMA) system based on time-division duplexing (TDD) mode and time-reversal (TR) technique. The proposed scheme uses the time-reversed version of the channel impulse responses (CIR) obtained from the uplink to pre-process the transmitted signal at base station. By exploiting the weak correlations...
In this paper, we propose a fast converging multiuser detection for interleave-division multiple access (IDMA) system based on time-reversal (TR) technique. The proposed algorithm uses the time-reversed version of the channel impulse responses (TR-CIR) obtained from the uplink to process the received signal before the elementary signal estimator (ESE). With the help of the weak correlation of fading...
Interleave-division multiple access (IDMA) is a multi-user scheme in which chip interleavers are the only means of user separation. The receiver involves a chip-by-chip iterative multi-user detection. Its complexity increases in a linear manner with the number of users, the number of iterations and the number of paths in the case of multipath channels. In spite of this linear increase, this can be...
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