Cochannel interference cancellation by base station adaptive array in uncorrelated Rayleigh fading channel
✍ Scribed by Yoshihisa Katoh; Takeo Ohgane; Yasutaka Ogawa; Kiyohiko Itoh
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 201 KB
- Volume
- 83
- Category
- Article
- ISSN
- 8756-6621
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✦ Synopsis
The interference cancellation characteristics of an adaptive array are discussed when the fading at each element is uncorrelated assuming low height base station. In this paper, we focus on the case that the number of antennas and interference waves is large. From the investigation of SINR characteristics we have found that when the average SNR is large, no diversity gain is obtained, but when the average SNR is small, the diversity gain is increased. In the BER characteristics when the number of antennas is less than 7, an increase in the number of antennas increases the gain. However, when the number is greater than 10, diversity gain is obtained due to extra degrees of freedom. While studying the influence of fading variation (uplink, downlink), we have found that deterioration is small in the uplink when the normalized Doppler frequency is less than 1 u 10 4 in the RLS and SMI interpolation method, and nearly complete tracking is possible. In case of the downlink, the floor error is less than 1 u 10 2 when the normalized Doppler frequency is less than 1 u 10 4 in both the SMI interpolation method and RLS interpolation method, and these methods can be applied practically.