New coding schemes for increased number of users or messages in frequency-hopped multilevel FSK

2006 IEEE International Conference on Ultra-Wideband

et al. 2006

Abstract-Interleaved coding-modulation (ICM) is a recently proposed method for ultra-wideband impulse radio (UWB-IR) systems. ICM exploits the concept of chip interleaving, allowing to alleviate the problem of inter-symbol and inter-pulse interference commonly present in high data rate UWB-IR systems. In this paper, previous work on ICM is extended to scarcely populated multi-user scenarios. A novel design of a deterministic chip interleaver based on time-hopping hyperbolic congruence sequences is proposed. Furthermore, the main parameters of the random and hyperbolic interleavers are reviewed. The obtained results indicate that the proposed type of interleaver yields similar performance to random interleavers but with the advantage of simpler implementation.

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Section: E Interleaver Sequence Designmentioning

confidence: 99%

Section: Hamming Correlationmentioning

confidence: 99%

Scarcely Populated UWB-IR Systems with Interleaved Coding-Modulation on Multipath Fading Channels

Pietrzyk

2006 IEEE International Conference on Ultra-Wideband

et al. 2006

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“…The cardinality of the set of sequences equals p' -1. 1/i is the unique inverse of i in the Galois field GF(p') and can be calculated as [14] I ip (mod p').…”

Section: Introductionmentioning

confidence: 99%

Multi-user UWB-IR systems with interleaved coding-modulation on multipath fading channels

Pietrzyk

IET Forum on Waveform Diversity and Design in Communications, Radar and Sonar

et al. 2006

Abstract-Interleaved coding-modulation (ICM) is a recently proposed method for ultra-wideband impulse radio (UWB-IR) systems. ICM exploits the concept of chip interleaving, allowing to alleviate the problem of inter-symbol and inter-pulse interference commonly present in high data rate UWB-IR systems. In this paper, we extend previous work on ICM to scarcely populated multi-user scenarios. We propose a design of a deterministic chip interleaver based on time-hopping hyperbolic congruence sequences. We also review the main parameters of the random and hyperbolic interleavers. Our results indicate that the proposed type of interleaver yields similar performance to random interleavers but with the advantage of simpler implementation.

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“…They are defined through the following placement operator [12]: y(k) = ak (mod p) (4) For simulation purposes, the cardinality and the periodicity of the codes are chosen to be equivalent, equal to the value of p. This method produces a family ofp different sequences.…”

Section: Linear Congruence Codesmentioning

confidence: 99%

“…Designed through a simple relationship between the user number, the iteration number, and a primitive element r, given by the equation [ 1]: y(k) = rk+ a (mod p) (12) This method requires a Galois field of size p, and the finding of a primitive element (r) of the field (which when raised to the powers from 0 to p-2 provides all elements of the field). For this simulation, r was chosen as 2, this being a primitive element of a Galois field of size 11 (see Section IV).…”

Section: J One-coincidence Sequencesmentioning

confidence: 99%

Performance Comparison of UWB Hopping Codes in a Multi-User Rich Scattering Environment

2006 IEEE 63rd Vehicular Technology Conference