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In this paper, a new reconfigurable processor for channel estimation in Orthogonal Frequency Division Multiplexing systems (OFDM) is proposed. The channel estimation algorithms are discussed and compared following the computational complexity criteria and the signal performances. Some representative algorithms are chosen to illustrate the different techniques of channel estimation, and are implemented. The processor CERA (Channel Estimation Reconfigurable Architecture) offers a wide flexibility and can manage the arithmetic operations of the channel estimation algorithms, in addition to those of other functionalities of the baseband OFDM system. It is compared, in terms of silicon area and power consumption, with other dedicated units in order to estimate the processor flexibility overhead.

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Wireless communications have been evolving in the past years in a fastway that led to the apparition of numerous standards like UMTS (3G), IEEE 802.11 (WLAN) and DVB-H. New mobile equipments should support multiple standards in order to offer the most complete set of applications to the user like telephony, mobile internet and mobile television. This paper presents a new method of implementing a high performance Finite Impulse Response (FIR) filter in the frequency domain that is suitable for third generation communication systems. The method discussed is also an enabler for the implementation of low cost modules capable of performing filtering and fast Fourier transforms for use with the wide variety of the wireless communication standards available nowadays.