This paper outlines that when decoding an arbitrary analog block codes, i.e., a block codes over the complex or real numbers, in an iterative fashion by splitting the H-Matrix in two, leads to a least-squares estimate. Such a Turbo-like algorithm represents iterative projections in Euclidean space. A step size controls the convergence speed. The paper generalized an earlier result based on arra...

The discovery of Turbo Codes in 1996 by Berrou et. al. proved to be a huge boost for the research of channel coding. The Turbo Principle behind turbo codes was found to be applicable in other areas. One of these areas is Multiuser Detection. In this thesis, Turbo Multiuser Detection is investigated in order to answer two main questions. The questions concern the performance gain that is obtaine...

Following the trend of turbo codes and low density parity check (LDPC) codes, single-parity turbo product codes (TPC/SPC) are being seriously considered for application in future high-density recording systems. Recent work on TPC/SPC codes has focused on ideal partial response channels with additive white Gaussian noise. This work extends the investigation to a more realistic equalized Lorentzi...

Due to their near Shannon-capacity performance, turbo codes have received a considerable amount of attention since their introduction [1]. They are particularly attractive for cellular communication systems and have been included in the specifications for both the WCDMA (UMTS) and cdma2000 third-generation cellular standards. At this time, the reasons for the superior performance of turbo codes...

Third Generation Partnership Project-2 proposed cdma2000 standards, which offers two error correcting coding techniques, Convolutional Codes and Turbo Codes. In this paper we analyze the encoding and decoding techniques of the convolutional codes of cdma2000 standards. The performance, in the form of BER (Bit Error Rate) vs. 0 / b E N (bit energy per noise spectral ratio), by varying code rate,...

The publication of turbo codes in 1993 proved that there were error-correcting codes with performance close to the theoretical limit and which can be used in industrial products. Quickly, turbo codes have been adopted in several standards such as DVB-RCS, UMTS, CDMA2000 and 3GPP-LTE. The increasing demand for high throughput applications in broadband applications until 1 Gb/s and beyond is stro...

Previous research which analyzed the performance of a convolutionally coded CDMA system with a MMSE receiver for interference suppression showed that lower rate codes are not always the best choice on Rayleigh fading channels. In this paper, we analyze the performance of a turbo-coded CDMA system with the MMSE receiver. Theoretical bounds are derived based on the optimum tap weights of the MMSE...

Absrract-This paper presents parallel concatenated turbo codes that employ a non-uniform constellation to achieve shaping gain. The output signal approximates the Gaussian distribution by using equally likely signals with unequal spacing (a non-uniform constellation). The small distance of points near the center of the constellation may lead to a small overall free distance and thus a high erro...

This contribution introduces a novel maximumlikelihood (ML) frame synchronization technique for coded systems that exploits the code properties by accepting soft information from the MAP decoder. Simulation results are presented for turbo and LDPC codes, and are compared to performance results of a frame synchronizer that does not use the code properties. We show that code-aided frame synchroni...