By Sven Grundberg 

STOCKHOLM--Sweden's Ericsson reported an unexpectedly sharp decline in revenue for the first quarter on Wednesday, blaming lower revenue in North America and Japan.

The mobile network company's revenue in the first quarter totaled 47.51 billion Swedish kronor ($7.21 billion), down from 52.03 billion kronor a year earlier and below analysts' average forecast of 50.80 billion kronor.

Ericsson's Chief Executive Hans Vestberg said the revenue drop was largely a result of lower revenue from two large mobile broadband coverage projects in North America, which peaked in the first half of 2013, as well as reduced activity in Japan, where operators have slowed down investments into new fourth generation mobile data networks.

In North America--Ericsson's single largest market--overall revenue fell 23% in the first quarter compared with the same period a year earlier, while sales in North East Asia declined 19% on the year. The dismal developments in North America and Japan were partly offset by growth in China, the Middle East and Latin America.

While industry observers are widely expecting operator investments in Europe to pick up following the prolonged economic slump in the region, sales in Western Europe remained roughly flat in the first quarter, compared with a year earlier. Ericsson, however, said it has been awarded a five-year contract from Vodafone Group PLC as part of the mobile operator's effort to beef up its networks, an initiative dubbed Project Spring. Ericsson didn't disclose the size and scope of the contract.

On a more positive note, a more favorable business mix, with a smaller share of low-margin network rollout projects, bumped Ericsson's closely watched gross margin to 36.5% in the first quarter, from 32% a year ago, and helped boost the company's profit.

Ericsson's net profit came in at 2.12 billion kronor, up from 1.21 billion kronor a year ago. Operating income increased 25% on the year to 2.63 billion kronor.

Write to Sven Grundberg at sven.grundberg@wsj.com

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