DSP-Based Communications

Most modern systems use DSP techniques for both codec and modem functions. DSP techniques offer superior precision and stability over traditional analog methods. DSP-based digital modulation techniques are being used or considered for many applications such as voice-band modems, ISDN, HDSL, ADSL, High speed LANs, cable, microwave radio, cellular telephony, PCS, pagers, cordless phones, HF channel, satellite, cable TV and HDTV.

Recent advances in data converters and DSP semiconductors have made a DSP-based system a reality. Direct IF conversion brings the analog signal into a digital domain and all the down conversion, detection and decoding can be performed digitally. We can also implement the transmitter in a similar fashion.

Filters with 100 dB attenuation and oscillators with milli-Hz tuning resolution are common. DSP is also finding its way into analog modulation schemes such as AM, SSB and FM. There are also many similarities between storage and transmission and DSP techniques are also being considered or applied to disk drive read channel.

This seminar is about Physical Layer Processors. For those of you who understand the OSI 7 layer model, it means the lowest layer. We will not cover the higher layer issues such as switching and networking. We will discuss point-to-point transmission of digital and analog information.

RF/Analog designers, ASIC designers, software engineers and other non-DSP people tend to think of the digital transmitter and receiver as a DSP thing and think you can hire a DSP guy and she/he/it can handle everything! Unfortunately its not that simple!

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