7
Hardware Implementation for Single Carrier Systems
7.1 Introduction
Although various wireless standards define specifications for the air interface rather than from the transmitter side of the link, the overall system performance is often determined by the receiver-side design.1 In 60 GHz systems, this situation is becoming even more apparent due to various implementation challenges. Both carrier frequency and data transmission rates are an order of magnitude higher than in conventional wireless systems such as 5 GHz wireless local area networks. As a result, while major challenges in conventional wireless systems exist in recovering the channel disturbances, those in 60 GHz involve radio frequency (RF) as well as some baseband-related circuits (data converters, etc.) that could behave significantly different from ideal models in popular simulation environments such as MATLAB.
In this chapter we will discuss single carrier (SC) system implementation examples, starting with two proof-of-concept implementations equipped with full digital baseband, one with non-coherent detection and the other with differentially coherent detection. These systems were designed as early-phase prototyping; nevertheless, they provide significant technical insight for the design of multi-Gbps wireless systems with digital baseband techniques. The modulation formats used in the non-coherent demonstration system described here have been adopted as common/mandatory modes in IEEE 802.15.3c. ...
