Apparatus and method for channel estimation in a wireless communications system

A method, in a user equipment (UE), for channel estimation in a wireless communications network system, said method comprising:

• receiving a plurality of consecutive physical resource blocks from a radio base station;
• estimating a channel coefficient of each received physical resource block;
• calculating for each two adjacent physical resource blocks, a difference between estimated channel coefficients of the two adjacent physical resource blocks;
• comparing each difference with a predefined threshold value;
• grouping physical resource blocks for which said difference is less than or equal to the predefined threshold value;
• and
• performing a group-wise channel estimation on a group comprising physical resource blocks for which said difference is less than the predefined threshold value and performing per physical resource block channel estimation on each remaining physical resource block.

A non-transitory computer-readable medium comprising computer program code stored thereon, wherein said computer program code is configured to, when executed by a processor, cause the processor to:

• estimate a channel coefficient of each of a plurality of consecutive physical resource blocks received from a base station by a receiver associated with said processor;
• calculate, for each two adjacent physical resource blocks, a difference between estimated channel coefficients of the two adjacent physical resource blocks;
• compare each difference with a predefined threshold value;
• group physical resource blocks for which said difference is less than or equal to the predefined threshold value;
• and
• perform a group-wise channel estimation on a group comprising physical resource blocks for which said difference is less than the predefined threshold value and perform per physical resource block channel estimation on each remaining physical resource block.