نتایج جستجو برای: parity check code
تعداد نتایج: 237688 فیلتر نتایج به سال:
We show how to construct an algorithm to search for binary idempotents which may be used to construct binary LDPC codes. The algorithm, which allows control of the key properties of sparseness, code rate and minimum distance, is constructed in the Mattson-Solomon domain. Some of the new codes, found by using this technique, are displayed.
When a carrier aggregation communication system suffers from receiving power imbalance (RPI) in its antenna array due to design flaw, operator’s negligence etc. the system performance may be degraded to an unacceptable level. Specifically in this paper a carrier aggregation communication system with two carrier links while one link suffers RPI is considered, various modulation techniques, such ...
A set of convolutional codes with low density parity check matrices is derived from a class of quasi-cyclic low density parity check block codes. Their performance when decoded using the belief propagation algorithm is investigated.
The role of low density parity check principles in the design of group codes for coded modulation is examined. In this context, the structure of linear codes over certain rings Zm and Gm is discussed, and LDPC codes over these ring structures are designed.
We find lower bounds on the minimum distance and characterize codewords of small weight in low-density parity check codes defined by (dual) classical generalized quadrangles. We analyze the geometry of the non-singular parabolic quadric in PG(4, q) to find information about the low-density parity check codes defined by Q(4, q), W(q) and H(3, q). ForW(q) and H(3, q), we are able to describe smal...
Das ”Punktieren”von Daten hat sich als ein sehr leistungsfähiger Ansatz erwiesen, die Dekodierleistung von Low Density Parity Check Codes (LDPC) zu verbessern. Hierbei wird auf Senderseite ein Teil des Code-Wortes auf einen festen bekannten Wert gesetzt (punktiert) um so einen virtuellen Code mit einer im Vergleich zum Original-Code niedrigeren Code-Rate zu erzeugen. Dieser Ansatz erlaubt die D...
This paper introduces a class of linear codes which are non-uniform error correcting, i.e. they have the capability of correcting different errors in different codewords. A technique for specifying error characteristics in terms of algebraic inequalities, rather than the traditional spheres of radius e, is used. A construction is given for deriving these codes from known linear block codes. Thi...
In this paper, an efficient partial incremental redundancy (P-IR) scheme is proposed for an H-ARQ using block type low density parity check (B-LDPC) codes. The performance of the proposed P-IR scheme is evaluated in an HSDPA system using IEEE 802.16e B-LDPC codes. Simulation results show that the proposed H-ARQ using IEEE 802.16e BLDPC codes outperforms the H-ARQ using 3GPP turbo codes. key wor...
The received power imbalance (RPI) effect exists in multiple antennas wireless communications system due to design flaw, operator’s negligence etc. The range of RPI can be from −10 dB to 0 dB and if the RPI information is not available at the receiver terminal, it can implement turbo iterative receiver by concatenating multi-input and multi-output (MIMO) orthogonal frequency division multiplexi...
Algebraic methods for the construction, design and analysis of series of convolutional codes using row or block structures of unit schemes are developed. The general methods lead to the construction and analysis of series and infinite series of types of convolutional codes and of codes with specific properties. Explicit examples are given and properties may be shown algebraically. Algebraic dec...
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