Most of the academic work within the area of mobile terminal receiver 
design is either focusing on the radio (high-frequency) part or the 
digital signal processing (low-frequency) part. The interface between 
these parts are in many sense assumed ideal. However, in practical 
mobile terminal receiver design the radio design often has to be taken 
into account in the digital signal processing.

In this seminar I will discuss how the digital signal processing is 
affected when using a very cost efficient radio achitecture, a direct 
conversion receiver.  Such a receiver architecture is used in many GSM 
terminals of today.  A direct conversion receiver give rise to a number 
of impairments, where the DC-offset is the dominant one.  A theoretical 
analysis is shown in this seminar giving a design rule, which applies to 
the design of digital  DC-compensation in radio receivers. Furher, a 
method for enhancing the radio channel estimation in the direct 
conversion receiver case, based on the statistical properties of the 
pilot sequence transmitted from the base station is also presented. The 
seminar, is mainly based on two papers, "BER performance analysis of a 
direct conversion receiver", IEEE Transactions on Communications, May 
2002, (Bengt Lindoff and Peter Malm), and "Enhanced DC estimation via 
sequence-specific frequency offset", Vehicular Technology Conference 
September 2002 (Dennis Hui, Kambiz Zangi and Bengt Lindoff)