Comparative Study of Interleaves in Communication System: IDMA Overview
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paper_title: Performance and bandwidth efficient interleave-division multiple access scheme with high-spread interleavers

paper_content:

This paper presents high-spread (HS) random interleavers based interleave-division multiple access (IDMA) scheme. High-spread feature of a randodecm interleaver offers high-spread characteristics to interleavers and thus produces extrinsic values with low correlation. As interleavers are key components for user separation in the IDMA, the HS interleavers are employed in the IDMA for performance improvement. In addition, by replacing random interleavers with the HS interleavers in the IDMA, bandwidth efficiency is achieved by means of reducing the length of the repetition code. Performance evaluation shows that the proposed scheme of the IDMA with the HS interleavers provides significant BER performance improvement and moderate increase in bandwidth efficiency.
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paper_title: Analysis and design of Tree Based Interleaver for multiuser receivers in IDMA scheme

paper_content:

Here, we propose a novel tree based interleaver (TBI) for generating user specific chip-level interleaving sequences for various users in an IDMA system, which reduces computational complexity drastically. This interleaver also solves the memory cost problem and reduces the amount of information exchange between mobile stations and base stations required to specify the interleaver. Simulation results are presented to show that the proposed TBI perform well as compared to master random and random interleavers in an IDMA scheme.
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paper_title: Bounds and Approximations for Rapid Evaluation of Coherent MPSK Error Probabilities

paper_content:

The error probability for MPSK detection is expressed here as a sum of a familiar upper-bound approximation and a correction term which is well suited for numerical integration. An asymptotic expansion of the correction term is derived, from which simple and extremely tight upper and lower bounds are obtained. Relative errors in using these bounds and approximations of them are graphed for cases of practical interest.
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paper_title: Analysis and design of Tree Based Interleaver for multiuser receivers in IDMA scheme

paper_content:

Here, we propose a novel tree based interleaver (TBI) for generating user specific chip-level interleaving sequences for various users in an IDMA system, which reduces computational complexity drastically. This interleaver also solves the memory cost problem and reduces the amount of information exchange between mobile stations and base stations required to specify the interleaver. Simulation results are presented to show that the proposed TBI perform well as compared to master random and random interleavers in an IDMA scheme.
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paper_title: High Speed Channel Coding Architectures for the Uncoordinated OR Channel

paper_content:

Though it promises high bandwidths, the optical medium is not popular in local area networks. This is because current optical networks do not offer the ease of use and setup that an uncoordinated multiple access network such as Ethernet offers. By careful design and implementation of high speed channel coding architectures, we show that it is possible for optical networks to exhibit these desirable properties while maintaining high optical transmission rates. This paper presents an interleaver-division multiple access (IDMA) architecture implemented with a rate 1/20, 64-state Viterbi decoder and a word-based interleaver. These structures allowed us to achieve optical data rates of 2Gbps in FPGA implementation and 5.4Gbps for 0.18mum ASIC implementation. The techniques presented can be adapted for other similar architectures
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Title: Comparative Study of Interleaves in Communication System: IDMA Overview

Section 1: Concept Of Idma System
Description 1: Provide an overview and introduction to the IDMA system, highlighting its advantages, system model, and key components.

Section 2: Analysis Of Interleavers In Idma
Description 2: Discuss the concept of interleaving in IDMA, its role, and the benefits it provides, including error correction and burst error handling.

Section 3: Random Interleavers
Description 3: Explain the function and characteristics of random interleavers, including their impact on system performance and memory requirements.

Section 4: Master Random Interleavers
Description 4: Introduce the concept of master random interleavers and discuss how they address the limitations of random interleavers.

Section 5: Tree Based Interleaver (TBI)
Description 5: Outline the tree-based interleaver approach, its mechanism, and the benefits it brings in terms of memory and computational efficiency.

Section 6: Prime Interleaver
Description 6: Describe the prime interleaver, its method of operation, and its advantages in reducing bandwidth and memory requirements.

Section 7: Two Dimensional Prime Interleavers
Description 7: Detail the extension of prime interleavers to two dimensions, including the interleaving process and performance benefits.

Section 8: Two Dimensional Random Interleavers
Description 8: Discuss the two-dimensional random interleavers, their design, and how they differ from one-dimensional interleaving schemes.

Section 9: Spreading Codes
Description 9: Explain the importance of spreading codes in IDMA, including different types of spreading codes and their applications.

Section 10: Modulation Techniques In Idma System
Description 10: Review various modulation techniques used in IDMA systems, comparing their efficiency and performance.

Section 11: Comparison Results
Description 11: Present a comparative analysis of different interleaving techniques in terms of bit error rate, memory, and bandwidth requirements.

Section 12: Scope For Future
Description 12: Explore the future research directions and potential improvements in the IDMA scheme, including its application in optical networks and wireless communication enhancements.

Section 13: Conclusion
Description 13: Provide a summary of the findings and insights from the comparative study of interleaves in the IDMA system.