Mixed-signal Viterbi decoder for a MB-OFDM receiver

Maunu, J.; Laiho, Mika; Koivisto, Tero; Virtanen, K.; Pänkäälä, Mikko; Paasio, A.

doi:10.1109/icuwb.2008.4653431

Cited by 2 publications

(3 citation statements)

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“…in the add-compare-select operation. In the figure 2 shown, digital to analog converter is applied before the Viterbi decoding phase [4]. This enables an analog decoder processing core, which is capable to high speed operation with a lower level of power consumption as compared to the pure digital implementations.…”

Section: Introductionmentioning

confidence: 99%

“…For mobile devices with limited battery power, replacing digital circuits with low-power analog circuits can improve the power efficiency of the devices significantly [6] [7]. Digital designs of Viterbi decoder have reached speed bottlenecks, as they are iterative; complexities in Add-Compare-Select (ACS) operation [4] have further restricted the improvement in operating frequency. These constraints can be overcome with advanced and parallel signal processing techniques, analog circuits have been introduced as a high-speed and less power consuming alternative to the digital decoders [8], [9], [10].…”

Section: Introductionmentioning

confidence: 99%

“…IEEE 802.15.3a is customized for wireless communication systems at data rates up to 480 Mbps [3]. UWB systems are divided into two types based on implementation approaches: multiband based orthogonal frequency division multiplexing (MBOFDM) and single band based direct sequence UWB (DS-UWB) [4]. Both of these techniques use Viterbi decoder providing a maximum data rate of 480 Mbps with high performance.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hybrid Architecture for OFDM with Optimized Design of Analog Viterbi Decoder

Cyril¹,

Varugheese²

2012

IJCA

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Analog Viterbi Decoder (AVD) is used for decoding of message from the received signal. Very recently mixed signal architecture for OFDM was proposed, that uses FFT processing in the analog domain. In this work, we propose a modified analog Viterbi decoder that performs decoding in analog domain. The proposed analog Viterbi decoder can be used in the mixed signal architecture of OFDM model and hence the proposed architecture is called as Hybrid OFDM architecture. Software reference model of the proposed AVD is developed using Simulink and is verified for its functionality. The Branch Metric Unit (BMU) and the adder unit that forms the subsystems of AVD are optimized for area, power and speed by designing the adders with 24 transistors. The schematic and layout is designed using Virtuoso targeting 130nm technology, the captured design is verified for its functionality using known test vector. A digital Viterbi decoder is also designed with same specifications as that of AVD, and is synthesized using Design Compiler for comparison. From the results obtained it is found that the AVD is 100 time faster, occupies 8 time less are and consumes power less than 86 micro W compared with digital decoder. The proposed AVD is suitable for low power and high speed applications and can be used in Hybrid OFDM architecture.

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Section: Introductionmentioning

confidence: 99%