Performance of frequency domain sub-band diversity combination technique for wide-band mobile radio reception: An application to OFDM (Orthogonal Frequency Division Multiplexing) reception
✍ Scribed by Hiroyuki Hamazumi; Yasuhiro Ito; Hiroshi Miyazawa
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 298 KB
- Volume
- 81
- Category
- Article
- ISSN
- 8756-6621
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✦ Synopsis
We have investigated a sub-band space diversity technique and assessed its potential application to wide-band mobile radio reception. By simulating the application of SB-SD to OFDM reception, the following main conclusions were reached. For DQPSK-OFDM reception in an equal-amplitude single-echo environment, substantially better echo resistance characteristics are obtained by applying MRC SB-SD than by using a time-offset, combinationtype overall MRC-SD (i.e., WB-SD). When SB-SD is applied to DQPSK-OFDM reception in an equal-amplitude, single-echo environment and the spacing between receiving antenna branches is a half-wavelength (l/2), diversity gains of about 20 dB for a two-branch configuration and 25 dB for antenna configurations with three or more branches are obtained at a BER of 2 ´ 10 3 . The effectiveness of MRC SB-SD is demonstrated even when the delay time echo is longer than the OFDM guard interval. When SB-SD is applied to DQPSK-OFDM reception in a Rayleigh fading channel, diversity gains of about 17 dB for two-branch, 21 dB for three-branch, and 23 dB for fourbranch configurations are obtained at a BER of 2 ´ 10 3 .
Bit error rates at E b / N 0 = 20 dB for D8PSK-OFDM recep- tion in a Rayleigh environment are 2 ´ 10 2 for one-branch, 1 ´ 10 4 for two-branch, 1 ´ 10 4 for three-branch, and 1 10 5 for four-branch diversity. Bit error rates at E b / N 0 = 25 dB for D16PSK-OFDM reception in a Rayleigh environment are 2 ´ 10 2 for one-branch, 1 ´ 10 3 for two-branch, 1 ´ 10 4 for three-branch, and 1 ´ 10 5 for four-branch diversities.