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HiperLAN/2 Demo

The HIPERLAN/2 demo, hiperlan2, models part of HIPERLAN/2 (high performance radio local area network), European (ETSI) Standard for high-rate wireless LANs. It employs Orthogonal Frequency Division Multiplexing (OFDM) that operates in the 5GHz band and offers raw data rates up to 54 Mbps. The model shows transmitter side coding and modulation for the 16 QAM, ¾ code rate mode with a corresponding ideal receiver chain and AWGN channel. This document highlights these aspects of the demo:

Structure of the demo

The demonstration contains components that model the essential features of the HiperLAN/2 standard. The top row of blocks contains the transmitter components while the bottom row contains the receiver components. The table below shows which blocks and subsystems correspond to processes from the standard.

Process in Standard

Block or Subsystem in the Demo

FEC Coding

Convolutional Encoder and P2 Puncture

Data interleaving

Matrix Interleaver and General Block Interleaver

Signal constellations and mapping

Normalize

Modulation technique (OFDM)

OFDM Transmitter and OFDM Receiver

The demo also includes the Bernoulli Binary Generator block as a data source, the AWGN Channel block to simulate noise, and the Error Rate Calculation block and Display block to show error statistics.

Visible Results and Display

To examine the performance of the demo, use the sink blocks that are included in it, listed in the table below:

Icon or Window

What it Shows

Display icon

Error statistics for the entire system

Spectrum Scope window

Flat-top spectrum of the OFDM signal

Scatter Plot after normalization

Scatter plot of transmitted 16QAM signal

Scatter Plot after OFDM Receiver

Scatter plot of received 16QAM signal

The Spectrum Scope and the Scatter Plot after OFDM Receiver are visible upon running the demo. The Scatter Plot after normalization can be viewed by double-clicking on the `Transmitted Signal' Scatter Plot block

References

[1]  ETSI TS 101 475 V1.2.2 (2001-02) Broadband Radio Access Networks (BRAN): HIPERLAN Type 2: Physical (PHY) Layer. Available on http://www.etsi.org


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