Conference paper
Interference subspace rejection in wideband CDMA:: Modes for high data-rate operation
This paper extends our study on a multi-user receiver structure for base-station receivers with antenna arrays in multicellular systems. The receiver employs a beamforming structure with constraints that nulls the signal component in appropriate interference subspaces. Here we introduce a new mode, ISR-D (diversities), which finds and suppresses the subspace of the identified paths of all known interferers.
A frame extension technique is proposed which can be applied to all available ISR modes to increase the dimensionality of the observation space and thereby avoid noise amplification as a result of subspace suppression, as well as allow asynchronous transmission. Performance differences arise between the modes due to different sensitivities to channel identification and data detection errors.
For homogeneous high data-rate situations ISR-DX manifests the best performance. However, due to its reduced complexity, ISR-TRX appears to offer the best complexity-performance tradeoffs.
| Language: | English |
|---|---|
| Year: | 2001 |
| Pages: | 475-479 |
| Proceedings: | 2001 IEEE Global Telecommunications Conference |
| ISBN: | 0780372069 and 9780780372061 |
| Types: | Conference paper |
| DOI: | 10.1109/GLOCOM.2001.965162 |
Antenna arrays Array signal processing DS-CDMA Demodulation ISR-D ISR-TRX Interference constraints Multiaccess communication Multiple access interference RAKE receivers Receiving antennas Subspace constraints Wideband antenna array antenna arrays array signal processing asynchronous transmission base-station receivers beamforming structure broadband networks cellular radio channel identification code division multiple access data detection errors diversity reception frame extension technique high data-rate operation interference subspace rejection interference suppression multi-user receiver structure multicellular systems multiuser channels observation space dimension radio receivers radiofrequency interference signal component nulls signal detection space-time adaptive processing spatio-temporal array-receiver spread spectrum communication wideband CDMA
