Performance of Iterative Multiuser Decoding and Channel Estimation in WCDMA systems
نویسندگان
چکیده
This paper studies the performance of iterative multiuser decoding, interference cancellation, and channel estimation techniques applicable to third generation WCDMA systems. The concept uses a posteriori probabilities of code symbols to enhance detection, decoding and channel estimation in an iterative fashion. Performance is analyzed in a multi-path channel with simulations. It is seen that the proposed concept combats multiuser interference eeectively and performs almost as well as single user systems.
منابع مشابه
Channel estimation for multiuser MIMO-OFDM systems based on Kalman algorithms
The use of multiple antenna’s at both transmitter and receiver to form multiple input and multiple output(MIMO) channels currently hold the potential to drastically improve the spectrum efficiency and capacity of future wireless communication system. For broadband systems ,OFDM turns a frequency selective channel into a set of parallel flat channels which reduces the receiver complexity. Design...
متن کاملIterative Detection, Decoding and Channel Parameter Estimation for Orthogonally Modulated DS-CDMA Systems
In this thesis, we study iterative detection, decoding and channel parameter estimation algorithms for asynchronous direct-sequence code division multiple access (DS-CDMA) systems employing orthogonal signalling formats and long scrambling codes. Multiuser detection techniques are widely used to combat the detrimental effects of multipath fading and multiple access interference (MAI), which are...
متن کاملIterative LMMSE Channel Estimation, Multiuser Detection, and Decoding via Spatial Coupling
Spatial coupling is utilized to improve the performance of iterative channel estimation, multiuser detection, and decoding for multiple-input multiple-input (MIMO) bitinterleaved coded modulation (BICM). Coupling is applied to both coding and BICM—the encoder uses a protograph-based spatially-coupled low-density parity-check (SC LDPC) code. Spatially and temporally coupled (STC) BICM is propose...
متن کاملIterative interference cancellation scheme with pilot-aided space-time estimation in DS-CDMA systems
Iterative multiuser interference cancellation schemes for Direct Sequence Code Division Multiple Access systems exhibit good performance results for a reasonable complexity. We study an efficient iterative scheme, combining interference cancellation, soft input soft output decoding and beamforming. To deal with unknown channels, we add a pilot-aided space-time channel estimation in each iterati...
متن کاملIterative Space-Time Interference Cancellation for W-CDMA Systems
Iterative multiuser interference cancellation schemes for Direct Sequence Code Division Multiple Access systems exhibit good performance results for a reasonable complexity. We study an efficient iterative scheme, combining interference cancellation, soft input soft output decoding and beamforming. To deal with unknown channels, we follow two approaches: on one hand the addition of a pilot-aide...
متن کامل