FPGA Central

Hello !

How can I calculate the DL and UL, OFDMA raw (no coding applied ) dat
rate theoritically , if I have the following specs ?


Parameter Specification
Carrier Frequency 3.3GHz
Bandwidth 1.75MHz
Number of subcarrriers 256
Tb 128 usec
OFDM symbol time 160 usec
Number of users 4
Delay Spread length 0 ~ 16 usec
Length of CP 32 usec
Signal constellation 16 QAM
Number of bits per QAM symbol 4
Symbol period (T) 0.625 usec

Max Data Rate (Mbs) ?
(DL if TDM is applied on OFDM symbols carring all users data)
(UL if OFDMA is used and each user has let's say 48 subcarriers t
transmitt)

2 ) In order to calculate the capacity ? is C = R/BW ok to calculate
where BW will be 48xBW_of each subchannel


3) in order for a system to be broadband it has to be of atleast 3MHz
so 1.75MHz (wimax spec) is not broadband??? or it is only in one lin
? each link forward and back each has 1.75Mhz of BW ??


Regards,
Steve

>Hello !
>
>How can I calculate the DL and UL, OFDMA raw (no coding applied ) data
>rate theoritically , if I have the following specs ?
>
>
>Parameter Specification
>Carrier Frequency 3.3GHz
>Bandwidth 1.75MHz
>Number of subcarrriers 256
>Tb 128 usec
>OFDM symbol time 160 usec
>Number of users 4
>Delay Spread length 0 ~ 16 usec
>Length of CP 32 usec
>Signal constellation 16 QAM
>Number of bits per QAM symbol 4
>Symbol period (T) 0.625 usec
>
>Max Data Rate (Mbs) ?
>(DL if TDM is applied on OFDM symbols carring all users data)
>(UL if OFDMA is used and each user has let's say 48 subcarriers to
>transmitt)
>
>2 ) In order to calculate the capacity ? is C = R/BW ok to calculate
>where BW will be 48xBW_of each subchannel
>
>
>3) in order for a system to be broadband it has to be of atleast 3MHz
> so 1.75MHz (wimax spec) is not broadband??? or it is only in on
link
>? each link forward and back each has 1.75Mhz of BW ??
>
>
>Regards,
>Steve


Roughly speaking 1.75 Mhz/256 carriers = 6.84 Khz subcarrrier width.
In DL FUSC, 48 subcarriers will be assigned to a user, so 48 * 6.84Khz
4bits/symbol=1.3Mbps
This is not considering FEc as you said.