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This paper studies a novel iterative soft interference cancellation (SIC) aided beamforming receiver designed for high-throughput quadrature amplitude modulation systems communicating over additive white Gaussian noise channels. The proposed linear SIC aided minimum symbol error rate (MSER) multiuser detection scheme guarantees the direct and explicit minimisation of the symbol error rate at the output...
RECFEC is a REConfigurable processor optimized for soft implementation of Forward Error Correction (FEC) algorithms. Viterbi, Turbo, Reed-Solomon and LDPC coding algorithms are widely used in wired and wireless standards. The implantation of these algorithms on RECFEC for a multi-mode wireless system is explored and performance metrics are demonstrated. RECFEC is comprised of a pool of processing...
In this paper we analytically evaluate the performance of turbo frequency domain equalizers when the frequency selective channel is estimated erroneously. We generalize the bit error rate transfer chart method proposed with the assumption of perfect channel information to the case with imperfect channel state information to analyze the performance of a turbo frequency domain equalizer. Through a comparative...
This paper presents a new method that improves the performance of coded cooperation, especially in the error floor region. This method uses a modified repeat-punctured turbo code or double repeat-punctured turbo code with the cooperative scheme, where the modified repeat-punctured turbo code uses a repeater and an interleaver for both the first and second recursive systematic encoders. The analysis...
Circular trellis code modulators (CTCM) are low latency, short block codes. These codes were originally designed for spread spectrum communication systems operating in an anti- jam environment. For these applications, low-rate, non-systematic parallel concatenated encoders along with iterative turbo decoders were used to achieve Near Shannon limit performance. For applications that require high data...
The key implementation issue for most of the powerful error correcting codes is overall decoding complexity. Compared with 8-state turbo codes, proposed code can achieve nearly the same performance with significantly reduced decoding complexity. The proposed code is modified turbo code which uses parallel concatenation of component codes. First few component codes are series combination of zigzag...
The Long Term Evolution (LTE) of the WCDMA standard requires turbo decoding throughputs of up to 100 Mbps. Unfortunately, the existing WCDMA turbo interleaver does not permit an efficient high throughput implementation. The almost regular permutation (ARP) and quadratic polynomial permutation (QPP) interleavers were proposed to rectify this situation with QPP selected for LTE. In this paper, the interleavers...
In this paper we propose iterative turbo minimum mean squared error (MMSE) successive parallel arbitrated decision feedback (DF) receivers for direct sequence code division multiple access (DS-CDMA) systems. We describe the MMSE design criterion for DF multiuser detectors along with successive, parallel and iterative interference cancellation structures. A novel efficient turbo DF structure that employs...
We consider the problem of carrier frequency and phase synchronization at low SNR without a training sequence for short packet transmission. A low-complexity iterative joint symbol timing and carrier synchronization algorithm making use of the extrinsic information from the soft-input soft-output (SISO) decoder is proposed. The non-data-aided (NDA) algorithms are used for initial synchronization....
A recently proposed space-time block coding (STBC) signal construction method that combines orthogonal design with sphere packing, referred to here as (STBC-SP), has shown useful performance improvements over Alamouti's conventional orthogonal design. In this contribution, we propose a purely symbol-based LDPC-coded scheme, demonstrating that the performance of STBC-SP systems can be further improved...
With significant research being conducted in Ultra Wideband communications to increase error performance, this paper proposes a combination of user multiplexing and data encoding to achieve a BER improvement. Through the use of non-binary turbo coding, data is modulated to form a time hopping code which is applied to a time-reversed UWB system. Comparative results with conventional binary coding are...
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