- タイトル
- Capacity, throughput, and delay of slotted ALOHA DS-CDMA links with adaptive space-time auxiliary-vector receivers
- 著者
- S.Gopalan, G.N.Karystinos, D.A.Pados
- 出典
- IEEE Trans. Wireless Commun.,
vol.4, no.1, pp.79-92,
2005/01.
- キーワード
- slotted ALOHA, DS-CDMA, spread ALOHA, throughput, capacity, transmission delay, FEC, bit error rate, multipath fading, packet error probability
- 概要
- We investigate the user capacity, throughput, and delay characteristics of a mobile slotted ALOHA direct-sequence code-division-multiple-access (DS-CDMA) link with dedicated signatures under multipath fading and packet-rate adaptive antenna array signal reception. For a given system transmission bit rate, the packet size is designed to be sufficiently small to conform with the coherence time of the channel. Then, on an individual packet-by-packet basis, a phase-ambiguous spatial-temporal channel estimate is produced by a blind (unsupervised) eigensubspace procedure. The space?time channel estimate is phase corrected via a few pilot packet mid-amble bits and used for joint spatial-temporal multiple-access-interference suppression according to the principles of auxiliary-vector filtering. Subsequently, packet success probabilities are derived in the presence or absence of forward error correction and are used to evaluate the throughput and delay characteristics of the link.
- 分類
- [SST]直接拡散アロハ：スロット付ALOHA (No.4763)