IMPROVED MULTIUSER DETECTION SCHEMES FOR INTERFERENCE MANAGEMENT IN TH PPM UWB SYSTEM WITH m-ZCZ SEQUENCES
نویسنده
چکیده
Accommodating many users in a small area is a major issue in the communication system. Frequency spectrum sharing and time sharing are used in the conventional systems. Hence, they have limitation on the capacity of the system. With the advent of spread spectrum, many users can be accommodated within the fixed bandwidth by making use of certain coding properties over the bandwidth. However, this system suffers from MAI caused by simultaneous multiple access. The key to this problem is MUD technique. These detection schemes help to detect the users’ data in the presence of MAI, ISI and noise (Verdu 1989).
منابع مشابه
Random Sign Repetition Time-Hopping UWB with Multiuser Detection
Recently, ultra-wideband (UWB) technology, which uses a very short pulse for wireless digital communications, has been extensively investigated due to its significance that enables to transmit data sequences at a very high rate. Although the propagation range of UWB signals is short (about ten meters [1]), its impact on wireless home networks can be quite significant. Apart from the support of ...
متن کاملTh-uwb Receiver Based on Two Pdfs Approx- Imation in Multiuser Systems
As the distribution of the multiuser interference plus noise in time-hopping ultrawide bandwidth (TH-UWB) systems can not be reliably approximated by Gaussian probability density function (PDF), the bit error rate (BER) performance of the conventional matched filter receiver in TH-UWB multiuser systems degrades. In this paper we study a novel TH-UWB receiver based on two PDFs approximating the ...
متن کاملTernary Zero Correlation Zone Sequences for Multiple Code UWB
We construct a ternary zero correlation zone (ZCZ) sequence set with both periodic and aperiodic ZCZ based on mutually orthogonal complementary sets. A multicode UWB system based on ternary ZCZ sequence sets can adapt its data rate by changing the size of the code set to satisfy different data rate requirements without compromising its BER performance. Multicode systems based on constructed ZCZ...
متن کاملThe 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC’07) CAPACITY ANALYSIS OF A TH-PPM UWB SYSTEM USING A NEAR-INTERFERENCE ERASURE SCHEME IN MULTI-USER ENVIRONMENTS
In this paper, the capacity of a TH-PPM UWB system with an outage constraint in multi-user environments is mathematically analyzed and evaluated. To mitigate a near-far problem, a near-interference erasure scheme is adopted and the capacity of the TH-PPM UWB system using the near-interference erasure scheme is evaluated through numerical analysis and Gaussian approximation. The numerical result...
متن کاملSpace-Time Diversity Schemes with Blind Channel Estimation for TH-PPM UWB MIMO Communications
—For a time-hopping (TH) pulse position modulation (PPM) based ultra-wideband (UWB) multiantenna system, we propose four coherent space-time (ST) diversity schemes, corresponding to which the correlation template signals with blind channel estimation are also presented. First of all, the issue of channel identifiability based on first-order statistics is addressed, aspired by the singleantenna...
متن کامل