| Author | Jia, Hongmin |
| Call Number | AIT RSPR no. TC-94-05 |
| Subject(s) | Digital communications
|
| Note | A research submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies |
| Publisher | Asian Institute of Technology |
| Series Statement | Research studies project report ; no. TC-94-05 |
| Abstract | Nyquist filters are known to be important in digital transmission system since they
can provide zero intersymbol interference. Depending on the application, Nyquist filters
are implemented with two square root Nyquist filter by splitting them into transmitreceiver
filter pairs. This filtering techniques are widely used in U.S. digital cellular
system.
In this paper, main emphasis is on the design of square root Nyquist digital filters
m presence of analog reconstruction and anti-aliasing filters. The application of
optimization techniques in filter design is discussed. This method is based on the
computation of constrained optimization problems. The proposed design procedure is
general enough to incorporate both time- and frequency-domain constraints. This paper
also introduces the procedure for testing and estimating the performance of these filters.
A practical computer program is given based on the design of square root raised
cosine filter with Butterworth lowpass filter as the prototype of analog filter. The
performance of these filters is presented. The testing signal is n/4-shifted-DQPSK
sequence. The intersymbol interference results are provided by the root mean square
(RMS) values of vector errors at symbol ~oints and at middle symbol points. The factors
affecting results are analyzed. |
| Year | 1994 |
| Corresponding Series Added Entry | Asian Institute of Technology. Research studies project report ; no. TC-94-05 |
| Type | Research Study Project Report (RSPR) |
| School | School of Advanced Technologies (SAT) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Makelainen, Kimmo |
| Examination Committee(s) | Ahmed, Kumar;Sharma, A.B. |
| Scholarship Donor(s) | Finnish International Development Agency
(FINNIDA) |
| Degree | Research Studies Project Report (M.Eng.) - Asian Institute of Technology, 1994 |