Joint Turbo Receiver for LDPC-Coded MIMO Systems Based on Semi-definite Relaxation
نویسندگان
چکیده
Semi-definite relaxation (SDR) has been shown to have the capability of approaching maximum-likelihood (ML) performance. In this work, we first develop a new SDR-based detector that jointly uses forward error correction (FEC) code information in the detection stage. The joint SDR detector substantially improves overall receiver performance by generating highly reliable information to downstream decoder. For further performance improvement, the joint SDR detector is connected with decoder using a feedback link to form an iterative turbo receiver. Meanwhile, we propose a simplified SDR receiver that solves only one SDR problem per codeword instead of solving multiple SDR problems in the iterative turbo processing. This scheme significantly reduces the complexity of SDR turbo receiver, while the error performance remains similar as before.
منابع مشابه
LDPC Coded Turbo Equalization for MIMO System
—In this paper, MIMO (Multiple-Input-Multiple Output) system based on turbo equalization techniques which LDPC (Low Density Parity Check) codes were outer code and STTC (Space Time Trellis Code) were employed as an inner code are studied. LDPC decoder and STTC decoder are connected through the interleaving and de-interleaving that updates each other's information repeatedly. On the receiver si...
متن کاملWireless broadband single-carrier systems with MMSE turbo equalization receivers
Broadband single-carrier modulated signals experience severe multipath distortion when propagating through the physical medium. Correcting the distortion with channel equalization is the foremost task of the detector. Prior information about the transmitted signals in the form of channel decoder feedback can significantly enhance equalization accuracy. An algorithm that iteratively performs cha...
متن کاملLDPC-based space-time coded OFDM systems over correlated fading channels: Performance analysis and receiver design
We consider a space–time coded (STC) orthogonal frequency-division multiplexing (OFDM) system with multiple transmitter and receiver antennas over correlated frequencyand time-selective fading channels. It is shown that the product of the time-selectivity order and the frequency-selectivity order is a key parameter to characterize the outage capacity of the correlated fading channel. It is also...
متن کاملLow Dimensional MIMO Systems with Finite Sized Constellation Inputs
The seminal works in [1] and [2] on multiple antenna elements at the transmitter and the receiver show a huge increase in the throughput of this point-topoint channel referred to also as multiple input multiple output (MIMO) system. These promising results of high spectral efficiency and enhanced reliability shifted the focus of research on multi antenna communications and motivated the introdu...
متن کاملSemi-blind Channel Estimation and Iterative Detection for MIMO-OFDM Systems
The combination of MIMO and OFDM techniques has been recently explored for providing high speed data communication over fading dispersive channels. Bit interleaved coded modulation (BICM) architecture with iterative detection and decoding techniques (IDD) at the receiver has been found to attain good performance (close to Turbo MIMO) with moderate complexity. The scheme however relies on the av...
متن کامل