OCDMA/OCDMA Overloading Scheme for Cellular DS-CDMA Using Orthogonal Gold Codes and Complex Scrambling
نویسندگان
چکیده
منابع مشابه
OCDMA/OCDMA Overloading Scheme for Cellular DS-CDMA Using Orthogonal Gold Codes and Complex Scrambling
Overloading is a method to extend capacity limitation of multiple access techniques. The system becomes overloaded, when the number of users exceeds the signal dimensions. One of the efficient schemes to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O). In this paper, the BER performance of a new overloading scheme using scrambled orthogonal Gold code (OG/OG) sets ...
متن کاملOverloading Scheme for Cellular DS-CDMA using Quasi-Orthogonal Sequences and Iterative Interference Cancellation Receiver
Overloading is a technique to accommodate more number of users than the spreading factor N. This is a bandwidth efficient scheme to increase the number users in a fixed bandwidth. One of the efficient schemes to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O). The first set is assigned to the N users and the second set is assigned to the additional M users. An ite...
متن کاملA New Overloading Scheme for DS-CDMA System
In this paper a new overloading scheme for DS-CDMA system is analyzed, which allows to accommodate a higher number of users than the spreading factor N. In this scheme, orthogonal codes are assigned to first N users synchronously and additional users are assigned pseudorandom (PN) codes asynchronously. It is shown that with this hybrid scheme, the BER performance of first N users is considerabl...
متن کاملHybrid ARQ scheme using interleaved Reed-Solomon codes in a power controlled DS-CDMA cellular system
Abstmct: In this paper, a new hybrid automatic repeat request (ARQ) scheme is proposed for data transmission in a power controlled DS-CDMA cellular system. Data frame is composed of interlead Reed-Solomon codes. The depth of interleaving is determined by a power control intenal. After decodhg each codeword, the post decoding processor decides whether to accept the codeword or to discard it by u...
متن کاملRate control for DS-CDMA channels using power control and short orthogonal pseudo random codes
-Multimedia applications are increasingly seen in wireless service networks. The higher channel rate requirements of certain multimedia services, such as video, places constraints on wireless resources, which must provide high channel rates in the presence of high interference and noise. We propose to increase the channel rate of high rate multimedia users by controlling the effective signal to...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Communications, Network and System Sciences
سال: 2008
ISSN: 1913-3715,1913-3723
DOI: 10.4236/ijcns.2008.13025