New: Symbol rate, Bandwidth and Bit rate definition and conversion of each others.
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08-01-2015, 01:56 PM
Post: #1
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Symbol rate, Bandwidth and Bit rate definition and conversion of each others.
Symbol rate:
In digital communications, symbol rate is the number of symbol changes (waveform changes or signaling events) made to the transmission medium per second using a digitally modulated signal or a line code. The Symbol rate is measured in baud (Bd) or symbols/second. Bandwidth: Bandwidth is often used as a synonym for data transfer rate – the amount of data that can be carried from one point to another in a given time period (usually a second). This kind of bandwidth is usually expressed in bits (of data) per second (bps). Bit rate: In telecommunications and computing, bit rate (sometimes written bit rate, data rate) is the number of bits that are conveyed or processed per unit of time. The bit rate is quantified using the bits per second (bit/s or bps) unit. Symbol Rate = Bandwidth / 1.35 (For QPSK and 8PSK modulation, Roll Off = 35%) Or, Symbol Rate = Bandwidth / 1.25 (For 8PSK modulation, Roll Off = 25%) Bit Rate = Symbol Rate * Modulation * Framing * FEC Where, Modulation: MSK ——– 1 bit/sec/Hz BPSK 2^1 = 1 bit/sec/Hz QPSK 2^2 = 2 bit/sec/Hz 8PSK 2^3 = 3 bit/sec/Hz 16QAM 2^4 = 4 bit/sec/Hz 32QAM 2^5 = 5 bit/sec/Hz 64QAM 2^6 = 6 bit/sec/Hz 256QAM 2^8 = 8 bit/sec/Hz Framing = 188/204 Here, Packet Length =188 Frame Size=204 bits= X * Y * Color Depth X= Scaning Line (Ho) Y=Scaning Line (Ve) FEC = 1/2, 2/3, 3/4, 5/6, 7/8 Example: If the bandwidth is 5MHz, DVB, PAL, FEC=3/4, QPSK Modulation. What is the symbol rate and bit rate? Solution: Symbol Rate = Bandwidth / 1.35 =5 (MHz) / 1.3 = 5* 1000 / 1.35 = 3703.7 ≈3704 Maximum Symbol Rate is 3704 Hz. Now, we assume the symbol rate 3600 and the rest of it for side band. Bit Rate = Symbol Rate * Modulation * Framing * FEC = 3600*2*(188/204)*(3/4) = 4976.47 bit/sec =4.97647 Mbit/sec enjoy ........................... |
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The following 2 users Like biswanandan's post: SENTHIL KUMAR, SHFARUN |
08-01-2015, 02:07 PM
Post: #2
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RE: Symbol rate, Bandwidth and Bit rate definition and conversion of each others.
Good Information Dear Bro.
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The following 1 user Likes SHFARUN's post: biswanandan |
08-01-2015, 03:35 PM
Post: #3
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RE: Symbol rate, Bandwidth and Bit rate definition and conversion of each others.
Good Information bro
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The following 1 user Likes Sajee's post: biswanandan |
08-01-2015, 04:19 PM
Post: #4
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RE: Symbol rate, Bandwidth and Bit rate definition and conversion of each others.
Gud information bro.
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The following 1 user Likes Sgokul gp's post: biswanandan |
08-01-2015, 09:58 PM
Post: #5
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RE: Symbol rate, Bandwidth and Bit rate definition and conversion of each others.
Good Information bro
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