- タイトル
- A novel random wireless packet multiple access method using CDMA
- 著者
- C.Schlegel, R.Kempter, P.Kota
- 出典
- IEEE Trans. Wireless Commun.,
vol.5, no.6, pp.1362-1370,
2006/06.
- キーワード
- slotted ALOHA, spread ALOHA, DS-CDMA, multiuser detection, packet loss probability, Poisson arrival, throughput
- 概要
- Random Packet CDMA, a novel packet-based multiple access scheme for contentionless, uncoordinated random channel access is proposed. Random Packet CDMA, or RP-CDMA, utilizes a novel packet format which consists of a short header and a data portion. Each header is spread with a unique spreading code which is identical for all users and packet, while the data portion of each packet is spread by a randomly chosen spreading sequence. The receiver operates in two stages: header detection and data detection. For header detection a conventional spread spectral receiver is sufficient. Headers are spread with a large enough processing gain to allow detection even in severe interference. The data portion is decoded with a sophisticated receiver, such as a multiuser detector, which allows for successful decoding of overlapping active packets. It is shown that the RP-CDMA system is detector capability limited and that it can significantly outperform Spread ALOHA systems whose performance is limited by the channel collision mechanism. RP-CDMA also experiences a much smaller packet retransmission rate than conventional of Spread ALOHA, and provides better spectral efficiency.
- 分類
- [SST]拡散アロハ一般：その他 (No.5197)