By Sarah Turner, MarketWatch

SYDNEY (MarketWatch) -- Asia stocks gained on Wednesday amid renewed optimism for an agreement on upcoming U.S. tax hikes and spending cuts, ahead of the conclusion of a meeting at the U.S. central bank that may see it undertake more asset buying.

Japan's Nikkei Stock Average rose 0.7%, South Korea's Kospi advanced 0.4% and Australia's S&P/ASX 200 index rose 0.5%.

An unexpectedly strong reading for a gauge of German economic sentiment helped to lift European stocks on Tuesday, while U.S. stocks rose for the fifth straight session amid fresh hope for a deal to avoid billions of dollars of automatic spending cuts and tax hikes early next year.

"Investor sentiment towards the U.S. fiscal cliff is turning more positive," said Matthew Sherwood, head of investment market research at Perpetual Investments. "Investors thought a lack of public bickering between Republicans and Democrats meant the two sides are making progress," he said.

The Federal Reserve wraps up its two-day monetary policy meeting later in the global day and the U.S. central bank may announce fresh asset purchases.

"While balance sheet expansion represents a dovish shift in [the Fed's] monetary policy stance and is likely supportive for general risk sentiment, such a stance is widely expected and the overall market effect is likely limited should it move in line with our baseline case, in particular with looming uncertainty over the U.S. fiscal cliff," said strategists at Barclays Capital.

Technology stocks were generally strong in Japan on Wednesday, as the dollar held onto the gains that took the currency to around the  ¥82.50 mark on Tuesday.

TDK Corp. (TTDKF) rose 2.6% while Toshiba Corp. (TOSYY) advanced 1.1%.

Canon Inc. (CAJ) shares climbed 2.4% after a Nikkei report that the firm will cut costs by between 70 billion to 80 billion yen next year.

Panasonic Corp. (PC) shares rose 2.6% after a separate Nikkei report that the firm is planning to sell the digital camera operations of subsidiary Sanyo Electric Co.

Exporting automakers were also seeing some gains, with Mitsubishi Motors Corp. (MMTOY) up 1.1% and Honda Motor Co. (HMC) higher by 1%.

Cross-border deal making between Australian and Chinese companies featured on Wednesday.

Mining BHP Billiton Ltd. (BHP) climbed 1.1% after it said it's sold its 8.33% interest in the East Browse Joint Venture and 20% interest in the West Browse Joint Venture, with both gas projects located offshore Western Australia. The stakes were sold for $1.63 billion cash to a unit of PetroChina Co. (PTR)

(PTR)Rival Rio Tinto Ltd (RIO) climbed 0.5% after announcing that it will sell its 57.7% stake in the Palabora Mining Company Ltd. for $373 million to a consortium comprising South African and Chinese entities led by the Industrial Development Corporation of South Africa Ltd. and Hebei Iron & Steel Co.

The Korean market was supported by gains for heavyweight Samsung Electronics Co. (SSNLF) which moved higher by 0.1% in early trading.

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