By Jonathan Davies
Samsung says it expects to report a quarterly operating profit of 5.9 trillion won ($5.44bn; £3.65bn) for the first three months of 2015.
The results, which will be released later this month, would be ahead of market expectations, but a fall of more than 30% on the same period last year.
The Korean giant forecast sales of 47 trillion won during the three months.
The fall on last year as the company struggles to keep up with growing competition in China. Samsung is the world's biggest mobile phone manufacturer, but an Apple resurgence and the growth of manufacturers like Xiaomi, means that it has struggled to maintain its dominance in the market.