https://scholars.lib.ntu.edu.tw/handle/123456789/121746
標題: | Noncoherent Block Detection in the Presence of DC Offset | 作者: | Chung, Char-Dir | 關鍵字: | DC offset;block modulation;noncoherent block detection;iterative detection | 公開日期: | 八月-2006 | 出版社: | Taipei:National Taiwan University Dept Mech Engn | 卷: | VOL. 5 | 期: | NO. 8 | 起(迄)頁: | - | 來源出版物: | IEEE Transactions on Wireless Communications | 摘要: | In this paper, we deal with noncoherent detection of a digitally phasor block-modulated signal in the additive white Gaussian noise channel when a direct-current (DC) offset is present in the receiver baseband processing. By processing the received baseband signal block by block, a generalized linear transform is used to remove the offset prior to data detection, thereby releasing the succeeding detection process from the threat of DC offset. Operating on transform output blocks, a generalized maximum-likelihood scheme is developed for noncoherent data detection without a priori knowledge of channel amplitude and phase.When all the signaling blocks are confined within the space expanded by the basis vectors obtained from the offset-removal transform matrix, the proposed detection scheme can exploit the advantage of performing data detection and estimation on channel amplitude and phase jointly in the maximum-likelihood sense. It is analytically shown that the block detection scheme provides the bit error performance asymptotically approaching that of the corresponding ideal coherent phase-shift-keyed (PSK) detection in the absence of DC offset when the block length is increased. An iterative detection scheme is also modified from the block detection scheme to simplify the realization complexity. Both block and iterative detection schemes are shown to outperform the conventional training-sequence-aided PSK detection scheme under the same transmission throughput efficiency. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/200611150121807 | 其他識別: | 246246/200611150121807 |
顯示於: | 電信工程學研究所 |
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