By Anders Nilsson.

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Other modulation methods such as QAM can also be used “directly” in a single carrier system. Classical AM and FM radio also fall in this category. 2 OFDM As channel equalization in single carrier systems becomes more complex when the channel bandwidth grows, several other modulation methods have been developed to mitigate this problem. One such method is OFDM modulation. Orthogonal Frequency Division Multiplexing (OFDM) is a method which transmits data simultaneously over several sub-carrier frequencies.

Programmable baseband processors implementing SDR are necessary to enable efficient flexible multi-standard radio systems. They will also help system developers and manufacturers to reduce the Bill Of Materials (BOM) and enhance the lifetime of products by allowing software upgrades. This chapter highlights important aspects and benefits, both technical and economical, of using programmable baseband processors. 3 Technical aspects The most important benefits of using programmable baseband processors are listed below.

In the future, SDR systems will most certainly be used to both enable truly worldwide usable products and to efficiently utilize the scarce radio frequency spectrum available, for a wide consumer population. Furthermore existing solutions based on ordinary digital signal processors, do not have the computing power required to perform the computations needed to handle most modern radio standards, and the power consumption of such circuits is high due to their inherent flexibility. To enable programmable baseband processors, we need new processor structures which are optimized for this computing domain but still very flexible within the frame of the same domain.

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