Ofcom PLT Study
2-Weekly Project Report
From
7 December 2009
To
25 January 2010
Red
Red = unlikely to reach its
Amber Amber = may not
Green Green = on schedule for
next milestone/
reach the next
next
deliverables) on time.
milestone/deliverable
milestone/deliverable
Major issues are present
on time unless a major
within timescales, no
issue is sorted.
major issues.
Project Status
Green
Reason
In line with Project Plan
PROGRESS UPDATE
Progress this period:
Prepared briefing paper on potential victim systems in the 30-300MHz range leading to
recommendations on the 3 victim systems to be studied in detail.
Agreed with Ofcom the 3 victim systems to be analysed in detail, also providing comments on
additional systems suggested by Ofcom.
Made initial calculations of victim system parameters based on publicly available information.
Re-started stakeholder discussions. Contact has been made with Gigle (for an update on the chipset
in the latest Belkin 1Gbps PLT products) and with BBC and CAA (in relation to parameters for the FM
broadcast and aeronautical potential victim systems).
Started preparing models for analysis of PLT interference – including Seamcat models for the new
victim systems with propagation models appropriate to VHF.
Drafted sections to add to the report to cover potential victim systems up to 300MHz and their
performance characteristics.
Started working through comments from Ofcom on the original draft report and implementing updates.
Activities planned for next 3 weeks:
Pursue stakeholder contacts to confirm assumptions on PLT and receiver characteristics.
Prepare sections for report to cover interference mechanisms where different from original HF work
(this includes the aeronautical systems).
Test Gigle/Belkin PLT device pair in lab and domestic environments, including operation in proximity to
an FM broadcast receiver (as we did for Homeplug and UPA devices and a shortwave receiver).
Complete and validate Seamcat and analysis models.
Perform modelling work for baseline and sensitivity cases (high/medium/low PLT takeup).
Prepare modified report sections covering the results of the analysis and recommendations.
Discuss with Ofcom any comments that require clarification (e.g. around mandating requirements).
Complete updates to original draft report based on Ofcom comments.
Complete and deliver revised Draft Final Report to include frequencies up to 300MHz.
Key issues & risks:
To date the key risks and issues to the Project are:
Availability of robust data for victim systems – we have assumptions on technical parameters for victim
receivers and are seeking confirmation through stakeholder discussions.
Securing information from Gigle about characteristics of their chipset and related information – we
have the basics, but Gigle are sensitive about giving more information which may be made public.
Unexplained feature of Seamcat – the impact of the effect has been quantified (as ~1dB) by modelling
outside Seamcat, although we have been unable to resolve the issue with Seamcat’s developers.
Weekly Report 250110.doc
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