Here is a list of payment processing gateways that are supported in your region.
In particular, if you would like a direct, onsite gateway where the customers do not have to leave your site to complete their transaction on an external payment page I would recommend Quickpay. Otherwise, 2Checkout and Authorize.net are very popular gateways in your region.
Hope this helps!
Am I correct in presuming therefore that you want to enable a gateway that allows you to set USD as your default currency on your store, and charge in USD? To the best of my knowledge USD is a supported currency on the Quickpay gateway so it would be well worth running it by their support services to be absolutely sure!
But failing that, Authorize.net and 2Checkout are truly international gateways that certainly support USD as a currency,
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