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Hello I am looking for the "Pulse Shaping Filter" implemetation in matlab for the EDGE (Enhanced Datarate For GSM) standard. Can anybody help me in this matter. Thanks in Advance. Nitin |
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Pulse Shaping Filter for EDGE
Started by ●April 17, 2002
Reply by ●April 18, 20022002-04-18
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A traditional 8-PSK system uses raised-cosine filtering to remove intersymbol interference (ISI). You can use the FIRRCOS (Raised Cosine FIR Filter design) command. However, as you may (or not) know, using this approach, a one-to- one correlation exists between the required bandwidth and the target symbol rate with no intersymbol interference. For example, a minimum of 270.833 kHz RF bandwidth is required to deploy a system that uses GSMs 270.833-kHz symbol rate. Although ISI is eliminated using raised cosine filtering, 200 kHz of channel spacing results in a symbol rate less than 200 kHz the 8-PSK signal with raised-cosine filtering does not fit within 200 kHz of bandwidth. In order to achieve the desired symbol rate, a more severe filtering approach is required one that yields poorer performance with regard to ISI. EDGE makes this trade-off, resulting in a conservation of bandwidth at the expense of ISI. The following link explains this in more detail and has a useful reference for the filter. You can use the equations given in the paper to implement your filter if the raised-cosing is inadequate for your needs. http://www.commsdesign.com/main/2000/01/0001feat2.htm Jeff -----Original Message----- From: Nitin Nangare [mailto:] Sent: Wednesday, April 17, 2002 9:00 AM To: Subject: [matlab] Pulse Shaping Filter for EDGE Hello I am looking for the "Pulse Shaping Filter" implemetation in matlab for the EDGE (Enhanced Datarate For GSM) standard. Can anybody help me in this matter. Thanks in Advance. Nitin _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/matlab More DSP-Related Groups: http://www.dsprelated.com/groups.php3 ">http://docs.yahoo.com/info/terms/ |
