Title :
Modified SUGAR/DS: a new CDMA scheme
Author :
Elhakeem, Ahmed K. ; Rahman, M. Anisur ; Balasubramanian, Premkumar ; LE-NGOC, THO
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
fDate :
5/1/1992 12:00:00 AM
Abstract :
The authors prove by analysis the possibility of gaining a minimum of 2 dB in signal-to-noise ratio by just, splitting the users to three or more groups and identifying each one by an orthogonal waveform (on top of his short Gold code) in a PSK/DS spread-spectrum network. User signals may arrive in a code-asynchronous fashion at the receiver, however, it is shown that by using the scheme the average code cross-correlation is minimal compared to the classic code division multiple access (CDMA) system. Both the chip-synchronous and asynchronous cases are investigated and the uniform and optimal cases of dividing the users into orthogonal groups are analyzed. The superior bit error and network data throughput results in the different fading and forward error correction environments make the system a strong candidate for competitive domestic applications
Keywords :
code division multiple access; correlation theory; mobile radio systems; spread spectrum communication; CDMA; Gold code; PSK; SUGAR/DS; asynchronous case; average code cross-correlation; bit error rate; chip-synchronous case; code division multiple access; code-asynchronous signals; direct sequence system; fading environment; forward error correction; mobile radio; network data throughput; orthogonal waveform; spread-spectrum network; Error correction; Fading; Forward error correction; Gold; Multiaccess communication; Phase shift keying; Signal analysis; Signal to noise ratio; Spread spectrum communication; Throughput;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
