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Sample-timing error can cause significant performance degradation for the interleave-division multiple-access systems (Wang et al. 2009). In this paper, we propose a non-data-aided timing acquisition scheme to mitigate sample-timing error due to the asynchronous transmission of random allocated user ends (UEs) on the uplink. A closed-loop timing control scheme is constructed for the asynchronous IDMA...
A new hybrid multiple access scheme called SC-FDMA-IDMA is proposed, which combines IDMA (interleaved division multiple access) and SC-FDMA (single carrier frequency division multiple access). SC-FDMA-IDMA inherits many attractive features of SC-FDMA and IDMA. However, carrier frequency offsets (CFOs) also exist in this system since its inheritance. Moreover, the effect of CFO on the performance of...
OFDM-IDMA scheme has raised lots of research interests recently as it appears to be quite suitable for future broadband wireless transmission. OFDM-IDMA inherits many attractive features of OFDM and IDMA. However, OFDM-IDMA is also sensitive to carrier frequency offset (CFO) due to OFDM Furthermore, the performance of OFDM-IDMA with CFO has not been reported in the literature. In this paper, we investigate...
According to the high complexity of pre-coder in single-carrier interleave-division multiple access (IDMA) systems, in this paper, we propose a precoding technique based on time-reversal (TR) for single-carrier IDMA systems. The proposed scheme gets the channel impulse responses (CIR) through time-division duplexing (TDD) mode, and uses the time-reversed version of the CIR to pre-coder the transmitted...
This paper presents the performance comparison of interleave division multiple access (IDMA) and code division multiple access (CDMA) systems based on Simulink. We investigate the basic principle that illustrates the similarities and differences of the two different schemes. According to these schemes, we analyze every model function and build simulation platforms for these systems. The simulation...
IDMA can be regarded as a special case of CDMA, where the spreading can be done by an arbitrary low rate channel code equal for all users and the separation can be done by user-specific interleavers. In this paper, we provide the anti-jamming performance analysis of partial band for IDMA systems. First, we investigate the basic principle of IDMA briefly. Then introduce the generation of the partial...
Interleave-division multiple access systems (IDMA) has been extensively studied. In this paper, we present the performance analysis of anti-jamming for IDMA systems. The theoretic analysis and simulation results show that the performance of anti-jamming for IDMA systems is related to spread gain, code-bit rate, and the number of iterations, respectively. And our research work can provide a reference...
The effect of sample-timing error on the bit-error-rate (BER) performance of the interleave-division multiple access (IDMA) systems are studied in this paper. We construct an asynchronous IDMA system model to investigate the effect of sample-timing error caused by the asynchronous transmission from different user ends (UEs) on the BER performance. The theoretic analysis shows that sample-timing error...
Interleave-division multiple-access (IDMA) is one of the key multiple access techniques in the new wireless communication systems. In this paper, we investigate the basic principle of IDMA systems, analyze every model function, and build a simulation platform for IDMA systems. It is convenient to set the main parameters of the model of IDMA systems according to the simulation platform, and thus realize...
The effect of channel estimation error on the performance of the interleave-division multiple access (IDMA) systems are studied in this paper. For comparison, a channel estimation approach based on expectation maximization (EM) algorithm is also presented. The theoretic analysis and simulation results show that the variance of the channel estimation error affects the bit-error-rate (BER) performance...
In this paper, we propose a hybrid multiple access scheme which combines interleave division multiple access (IDMA) and code division multiple access (CDMA), therefore, we refer to this scheme as IDMA/CDMA. We employ IDMA technique as the uplink transmission and CDMA technique as the downlink transmission. Thus, IDMA/CDMA can achieve a very simple chip-by-chip iterative multi-user detection (MUD)...
A new channel estimation approach based on expectation maximization (EM) algorithm is proposed for the interleave-division multiple access systems (IDMA). The combination channel estimation is used in the proposed algorithm. The pilot sequences are used to estimate the channel information at the first iteration. The pilot and the soft estimates from the decoders are combined to refine the channel...
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...
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