Name
Abstract | ||
|---|---|---|
In this paper the trade-off between time diversity and the inter-carrier interference (ICI) in an OFDM based MC-CDMA system is discussed. Our approach is to partially shift each spectrum of an OFDM symbol at the transmitter by using different phase shifts in the time domain at different antennas after the OFDM modulation. The summary signal at the receiver has a wider Doppler spectrum as the result of different uncorrelated Rayleigh fading channels. This leads to an artificially increased selective time channel transfer function, which is more favorable for the channel decoder at the receiver. The trade-off between Doppler diversity and ICI is found at about 9% maximum Doppler spread of the subcarrier distance for flat fading channels and frequency selective fading channel models. The distance to the independent Rayleigh channel bound by applying an MMSE detector is less than 2 dB for convolutional coding and about 2 dB for turbo coding at a BER of 10-3 for flat fading channels. For frequency selective fading channels this approaches to less than 1 dB to the independent Rayleigh channel bound. |
Year | DOI | Venue |
|---|---|---|
2003 | 10.1109/GLOCOM.2003.1258448 | GLOBECOM |
Keywords | Field | DocType |
antenna,turbo codes,bit error rate,diversity reception,convolutional coding,mobile radio system,frequency selective channel model,transfer functions,flat fading channel,channel decoder,ofdm based mc-cdma system,doppler effect,ofdm modulation,orthogonal frequency division multiplexing,time diversity,channel coding,minimum mean squared error,ber,antenna arrays,cochannel interference,least mean squares methods,uncorrelated rayleigh fading channel,mobile radio,code division multiple access,turbo coding,doppler spread,radio receivers,inter-carrier interference,mmse detector,selective time channel transfer function,error statistics,rayleigh channels,convolutional codes,turbo code,fading channel,phase shift,transfer function,convolutional code,time domain,spectrum | Time diversity,Subcarrier,Diversity scheme,Telecommunications,Rayleigh fading,Fading,Computer science,Electronic engineering,Real-time computing,Fading distribution,Orthogonal frequency-division multiplexing,Channel state information | Conference |
Volume | ISSN | ISBN |
3 | 1930-529X | 0-7803-7974-8 |
Citations | PageRank | References |
2 | 0.46 | 4 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Ronald Raulefs | 1 | 196 | 19.66 |
| armin dammann | 2 | 212 | 36.06 |
| Stefan Kaiser | 3 | 154 | 26.54 |
| Gunther Auer | 4 | 1136 | 76.60 |