Barry George, who was acquitted of the murder of television presenter Jill Dando, takes his battle for compensation to the High Court later.
Mr George, who spent seven years in prison after his initial conviction, is challenging a decision that found he was not eligible for a payout.
The 50-year-old was refused a reported compensation claim of £1.4m.
Ms Dando, 37, was shot once in the head outside her home in Fulham, south-west London, on 26 April 1999.
Mr George was convicted of her murder at the Old Bailey in July 2001, but later had his conviction quashed on appeal in August 2008.
He was refused compensation by the then Justice Secretary Jack Straw in March this year, and a judge turned down his request for judicial review of that decision in May.
'Clearly innocent'
Legal papers submitted to the court say that Mr George suffers from post-traumatic stress disorder "in consequence of his wrongful conviction and sentence".
His barrister, Ian Glen QC, says his rehabilitation will depend on his financial circumstances, as he is unlikely to ever obtain paid work.
It is said that Mr George also suffers from Asperger's syndrome, epilepsy and has learning difficulties.
His lawyers are asking High Court judge Mr Justice Collins to consider the refusal of compensation for a judicial review.
They argue that Mr George was the subject of a miscarriage of justice and that he is "clearly innocent".
http://www.bbc.co.uk/news/uk-11081686